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Diffstat (limited to 'docs/usecases')
| -rw-r--r-- | docs/usecases/vpp_testbench/index.rst | 180 | ||||
| -rw-r--r-- | docs/usecases/vpp_testbench/labs/intro_to_vpp/index.rst | 257 | ||||
| -rw-r--r-- | docs/usecases/vpp_testbench/src/Dockerfile.vpp_testbench | 82 | ||||
| -rw-r--r-- | docs/usecases/vpp_testbench/src/Dockerfile.vpp_testbench.dockerignore | 14 | ||||
| -rw-r--r-- | docs/usecases/vpp_testbench/src/Makefile | 147 | ||||
| -rwxr-xr-x | docs/usecases/vpp_testbench/src/entrypoint_client.sh | 150 | ||||
| -rwxr-xr-x | docs/usecases/vpp_testbench/src/entrypoint_server.sh | 176 | ||||
| -rwxr-xr-x | docs/usecases/vpp_testbench/src/vpp_testbench_helpers.sh | 273 |
8 files changed, 1279 insertions, 0 deletions
diff --git a/docs/usecases/vpp_testbench/index.rst b/docs/usecases/vpp_testbench/index.rst new file mode 100644 index 00000000000..744fa864766 --- /dev/null +++ b/docs/usecases/vpp_testbench/index.rst @@ -0,0 +1,180 @@ +VPP Container Test Bench +======================== + +This project spins up a pair of Docker containers, both of which are running +Ubuntu 20.04 "Focal Fossa" (x86_64) along with VPP. At run-time, the containers +will attempt to create various links between each other, using both the Linux +networking stack as well as VPP, and will then send some simple traffic +back-and-forth (i.e. ICMP echo/ping requests and HTTP GET requests). + +The intent of this example is to provide a relatively simple example of +connecting containers via VPP and allowing others to use it as a springboard of +sorts for their own projects and examples. Besides Docker and a handful of +common Linux command-line utlities, not much else is required to build this +example (due to most of the dependencies being lumped inside the containers +themselves). + +Instructions - Short Version +---------------------------- + +The use of an Ubuntu 20.04 LTS Linux distro, running on x86_64 hardware, is +required for these labs. If your current workstation/PC/laptop/etc. is +unable to run such a setup natively, the reader is now tasked with figuring out +how to get such a setup in order. This can be accomplished, for example, +through the use of virtual machines via tools like VirtualBox, or ``vagrant``. +As this can be a time consuming task for readers new to virtual machines, we +leave it as an exercise for the reader, as it is impractical to provide support +for such a task in this narrow/focused set of labs and tutorials. + +This being said, it's quite probable that one could use these labs on different +flavors/distros of Linux, since the bulk of the work involved takes place +inside containers which are always set to use an Ubuntu 20.04 baseline. +However, for the sake of these labs, any other such setup is not supported. + +- Replicate the file listings at the end of this document + (:ref:`sec_file_listings_vpp_testbench`). You can also directly acquire a + copy of these files by cloning the VPP repo, and navigating to the + ``docs/usecases/vpp_testbench/src`` path to save yourself the hassle of + copy-pasting and naming the files. Once that's done, open a shell, and + navigate to the location housing the project files. +- To build the project, simply run: ``make`` +- To start up the containers and have all the initialization logic take place, + run: ``make start`` +- To trigger some basic traffic tests, run: ``make poll`` +- To terminate the containers and clean-up associated resources, run ``make stop`` +- To launch an interactive shell for the "client" container, run ``make + shell_client`` +- To launch an interactive shell for the "server" container, run ``make + shell_server`` + +Instructions - Long Version +--------------------------- + +Directory Structure and File Purposes +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +First, let's quickly review the purpose of the various files used in this +project. + +* ``vpp_testbench_helpers.sh``: shell variables and helper functions re-used in + other scripts in this project. Intended to be sourced (i.e. not intended to + be run directly). Some of the helper functions are used at run-time within + the containers, while others are intended to be run in the default namespace + on the host operating system to help with run-time configuration/bringup of + the testbench. +* ``Dockerfile.vpp_testbench``: used to build the various Docker images used in + this project (i.e. so VPP, our test tools, etc.; are all encapsulated within + containers rather than being deployed to the host OS). +* ``Dockerfile.vpp_testbench.dockerignore``: a "permit-list" to restrict what + files we permit to be included in our Docker images (helps keep image size + down and provides some minor security benefits at build time, at least in + general). +* ``entrypoint_client.sh``: entrypoint script used by the "client" Docker + container when it is launched. +* ``entrypoint_server.sh``: entrypoint script used by the "server" Docker + container when it is launched. +* ``Makefile``: top-level script; used to trigger the artifacts and Docker + image builds, provides rules for starting/testing/stopping the containers, + etc. + +Getting Started +^^^^^^^^^^^^^^^ + +First, we'll assume you are running on a Ubuntu 20.04 x86_64 setup (either on a +bare metal host or in a virtual machine), and have acquirec a copy of the +project files (either by cloning the VPP git repository, or duplicating them +from :ref:`sec_file_listings_vpp_testbench`). Now, just run ``make``. The +process should take a few minutes as it pulls the baseline Ubuntu Docker image, +applies system/package updates/upgrades via ``apt``, and installs VPP. + +Next, one can start up the containers used by the project via ``make start``. +From this point forward, most testing, experiments, etc.; will likely involve +modifying/extending the ``poll_containers`` definition inside ``Makefile`` +(probably easiest to just have it invoke a shell script that you write for your +own testing). Once you've completed various test runs, the entire deployment +can be cleaned-up via ``make stop``, and the whole process of starting, +testing, stopping, etc.; can be repeated as needed. + +In addition to starting up the containers, ``make start`` will establish +variaous types of links/connections between the two containers, making use of +both the Linux network stack, as well as VPP, to handle the "plumbing" +involved. This is to allow various types of connections between the two +containers, and to allow the reader to experiment with them (i.e. using +``vppctl`` to congfigure or trace packets going over VPP-managed links, use +traditional Linux command line utilities like ``tcpdump``, ``iproute2``, +``ping``, etc.; to accomplish similar tasks over links managed purely by the +Linux network stack, etc.). Later labs will also encourage readers to compare +the two types of links (perhaps some performance metrics/profiling, or similar +tasks). This testbench project is effectively intended as a baseline workspace +upon which one may design and run the labs (or your own projects and examples, +whichever works for you). + +Labs +---- + +.. toctree:: + labs/intro_to_vpp/index + +Future Labs +----------- + +.. note:: + + Coming soon. + +- Lab: Writing your First CLI Application (Querying Statistics) +- Lab: MACSWAP Plugin Revisited + +.. _sec_file_listings_vpp_testbench: + +File Listings +------------- + +Makefile +^^^^^^^^ + +.. literalinclude:: src/Makefile + :caption: Makefile + :language: Makefile + :linenos: + +Dockerfile.vpp_testbench +^^^^^^^^^^^^^^^^^^^^^^^^ + +.. literalinclude:: src/Dockerfile.vpp_testbench + :caption: Dockerfile.vpp_testbench + :language: Dockerfile + :linenos: + +Dockerfile.vpp_testbench.dockerignore +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. literalinclude:: src/Dockerfile.vpp_testbench.dockerignore + :caption: Dockerfile.vpp_testbench.dockerignore + :language: Dockerfile + :linenos: + +vpp_testbench_helpers.sh +^^^^^^^^^^^^^^^^^^^^^^^^ + +.. literalinclude:: src/vpp_testbench_helpers.sh + :caption: vpp_testbench_helpers.sh + :language: shell + :linenos: + +entrypoint_client.sh +^^^^^^^^^^^^^^^^^^^^ + +.. literalinclude:: src/entrypoint_client.sh + :caption: entrypoint_client.sh + :language: shell + :linenos: + +entrypoint_server.sh +^^^^^^^^^^^^^^^^^^^^ + +.. literalinclude:: src/entrypoint_server.sh + :caption: entrypoint_server.sh + :language: shell + :linenos: + diff --git a/docs/usecases/vpp_testbench/labs/intro_to_vpp/index.rst b/docs/usecases/vpp_testbench/labs/intro_to_vpp/index.rst new file mode 100644 index 00000000000..0b8acca4d90 --- /dev/null +++ b/docs/usecases/vpp_testbench/labs/intro_to_vpp/index.rst @@ -0,0 +1,257 @@ +.. _sec_lab_vpp_intro: + +Lab: Taking the VPP Container Testbench for a Spin +================================================== + +Assuming the reader has already acquired the test bench build scripts, let's +start with building it. + +.. code-block:: shell + :linenos: + + vagrant@ubuntu-focal$> make + # Client image. + DOCKER_BUILDKIT=1 docker build \ + --file Dockerfile.vpp_testbench \ + --build-arg HEALTHCHECK_PORT=8123 \ + --tag vpp-testbench-client:local \ + --target client_img \ + . + ... + ... + ... + DOCKER_BUILDKIT=1 docker build \ + --file Dockerfile.vpp_testbench \ + --build-arg HEALTHCHECK_PORT=8123 \ + --tag vpp-testbench-server:local \ + --target server_img \ + . + ... + ... + ... + => exporting to image + => => exporting layers + => => writing image + => => naming to docker.io/library/vpp-testbench-server:local + 0.0s + Done. + + +Now, let's start up our newly built images as a pair of containers. The various +hashes throughout this document will differ from those shown in your own +console (perfectly fine). First, let's assume there are no running containers +on your system. We'll verify via ``docker ps``: + + +.. code-block:: shell + :linenos: + + vagrant@ubuntu-focal$> docker ps + CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES + + +OK: good initial conditions. Now, let's launch the containers: + +.. code-block:: shell + :linenos: + + vagrant@ubuntu-focal$> make start + # Create Docker bridge network. + bash -c " . vpp_testbench_helpers.sh; host_only_create_docker_networks; " + 6e071e533e239380b2fe92d6e0844c42736ec186226fbb20d89706f9a80f935f + # Launch the containers. + bash -c " . vpp_testbench_helpers.sh; host_only_run_testbench_client_container + vpp-testbench-client:local; host_only_run_testbench_server_container + vpp-testbench-server:local; " + 720fed0a94fd715694d73a41317f05a3f36860a6d5ae54db2d7cb7f2dcaf7924 + ccf166993d09e399f7b10d372c47cc9e72ce6092ef70ea206c699263da844e1b + # Entrypoint scripts will bring up the various links. + # Use "docker ps" to check status of containers, see if their health + # probes are working as expected (i.e. "health"), etc. + + +Now, we can use ``docker ps`` to verify if the containers are up and running: + +.. code-block:: shell + :linenos: + + vagrant@ubuntu-focal$> docker ps + CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES + 7d8e3ab35111 vpp-testbench-server:local "/entrypoint.sh" 3 seconds ago Up 2 seconds (health: starting) vpp-testbench-server + cc01e64b12da vpp-testbench-client:local "/entrypoint.sh" 4 seconds ago Up 3 seconds (health: starting) vpp-testbench-client + + +Looking good so far. However, note the "health" status of the containers. +They're not yet ready. We can re-execute the ``docker ps`` command occasionally +until the containers are ready: + +.. code-block:: shell + :linenos: + + vagrant@ubuntu-focal$> while true; do docker ps; sleep 1; done + CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES + 42e9bcea7c58 vpp-testbench-server:local "/entrypoint.sh" 1 second ago Up Less than a second (health: starting) vpp-testbench-server + 710287b40bd3 vpp-testbench-client:local "/entrypoint.sh" 2 seconds ago Up Less than a second (health: starting) vpp-testbench-client + 42e9bcea7c58 vpp-testbench-server:local "/entrypoint.sh" 30 seconds ago Up 29 seconds (health: starting) vpp-testbench-server + 710287b40bd3 vpp-testbench-client:local "/entrypoint.sh" 31 seconds ago Up 30 seconds (healthy) vpp-testbench-client + CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES + 42e9bcea7c58 vpp-testbench-server:local "/entrypoint.sh" 31 seconds ago Up 30 seconds (healthy) vpp-testbench-server + 710287b40bd3 vpp-testbench-client:local "/entrypoint.sh" 32 seconds ago Up 31 seconds (healthy) vpp-testbench-client + + +Not the most elegant approach, but it works. Onward. + +.. note:: + + How would one automate this step so that we're not having to manually watch + the console until the containers are ready? What's something that we could + put into a script our our ``Makefile`` to poll the containers until they're + ready to use? + + .. raw:: html + + <details> + <summary><a>Spoiler</a></summary> + + .. code-block:: shell + + # "Direct" approach. + while true; do + [ '"healthy"' = docker inspect --format "{{json .State.Health.Status }}" vpp-testbench-client] && break + done + + # Could also use awk/grep/etc. against the output of "docker ps". + + .. raw:: html + + </details> + +Now that our containers are up and running, let's drop a shell into the +"client" container: + +.. code-block:: shell + :linenos: + + vagrant@ubuntu-focal$> make shell_client + +First, let's take a look at the default network configuration. + +.. code-block:: shell + :linenos: + + root@478ab126035e:/work# ip a + 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 + link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 + inet 127.0.0.1/8 scope host lo + valid_lft forever preferred_lft forever + 2: vxlan-vid-42: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default qlen 1000 + link/ether 3a:2c:19:cb:ca:35 brd ff:ff:ff:ff:ff:ff + inet 169.254.10.1/24 scope global vxlan-vid-42 + valid_lft forever preferred_lft forever + 3: vpp-tap-0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UNKNOWN group default qlen 1000 + link/ether 02:fe:c5:52:63:12 brd ff:ff:ff:ff:ff:ff + inet 169.254.12.1/24 scope global vpp-tap-0 + valid_lft forever preferred_lft forever + 635: eth0@if636: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default + link/ether 02:42:a9:fe:00:01 brd ff:ff:ff:ff:ff:ff link-netnsid 0 + inet 169.254.0.1/24 brd 169.254.0.255 scope global eth0 + valid_lft forever preferred_lft forever + +Let's also enumerate the interfaces managed by VPP. For the help of the reader, +there is a shell function, ``vc``, which just launches ``vppctl`` with some +helpful default arguments. + +.. code-block:: shell + :linenos: + + root@478ab126035e:/work# type vc + vc is a function + vc () + { + vppctl -s "${VPP_SOCK}" "${@}" + } + root@478ab126035e:/work# vc + _______ _ _ _____ ___ + __/ __/ _ \ (_)__ | | / / _ \/ _ \ + _/ _// // / / / _ \ | |/ / ___/ ___/ + /_/ /____(_)_/\___/ |___/_/ /_/ + + vpp# show int + Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count + local0 0 down 0/0/0/0 + memif0/0 1 up 9000/0/0/0 rx packets 7 + rx bytes 521 + tx packets 7 + tx bytes 503 + tap0 2 up 9000/0/0/0 rx packets 7 + rx bytes 503 + tx packets 7 + tx bytes 521 + vpp# + + +.. note:: + + One more exercise for the reader: + 1. From the client container, how would you ping the server container on the + Linux-managed VXLAN interface? + 2. From the client container, how would you ping the server container on the + VPP-managed TAP interface? + 3. A couple trivial web servers (using ``netcat``) are running on the server + container. Besides looking at the ``Makefile`` recipes, how could one + determine what ports and interfaces these servers are bound to, and + how would one issue an HTTP GET query against them from the client + container? (hint: you're allowed to log-in to the server container via + ``make shell_server``, and the ``netstat`` command may be of use). + + .. raw:: html + + <details> + <summary><a>Spoiler</a></summary> + + .. code-block:: shell + + 1. ping 169.254.10.2 + 2. ping 169.254.12.2 + 3. make shell_server + netstat -tulpn + tcp 0 0 169.254.12.2:8000 0.0.0.0:* + LISTEN 47/nc + tcp 0 0 169.254.10.2:8000 0.0.0.0:* + LISTEN 34/nc + exit + make shell_client + root@478ab126035e:/work# curl 169.254.10.2:8000 + HOST:14f0df855445 + DATE:Fri Nov 19 16:36:57 UTC 2021 + Hello from the Linux interface. + root@478ab126035e:/work# curl 169.254.12.2:8000 + HOST:14f0df855445 + DATE:Fri Nov 19 16:37:04 UTC 2021 + Hello from the VPP interface. + exit + + .. raw:: html + + </details> + +Now that we've done some quick exercises, let's clean-up the containers and +their associated resources. + + +.. code-block:: shell + :linenos: + + vagrant@ubuntu-focal$> make stop + # Terminate the containers. + bash -c " . vpp_testbench_helpers.sh; host_only_kill_testbench_client_container vpp-testbench-client:local; host_only_kill_testbench_server_container vpp-testbench-server:local; " + vpp-testbench-client + Error: No such container: vpp-testbench-client + vpp-testbench-server + Error: No such container: vpp-testbench-server + # Cleanup Docker bridge network. + bash -c " . vpp_testbench_helpers.sh; host_only_destroy_docker_networks; " + vpp-testbench-net + +That's it for this section. + diff --git a/docs/usecases/vpp_testbench/src/Dockerfile.vpp_testbench b/docs/usecases/vpp_testbench/src/Dockerfile.vpp_testbench new file mode 100644 index 00000000000..f7e19feebbf --- /dev/null +++ b/docs/usecases/vpp_testbench/src/Dockerfile.vpp_testbench @@ -0,0 +1,82 @@ +#------------------------------------------------------------------------------# +# @brief: Dockerfile for building the VPP testbench project. +# @author: Matthew Giassa <mgiassa@cisco.com> +# @copyright: (C) Cisco 2021. +#------------------------------------------------------------------------------# +# Baseline image both client and server inherit from. +FROM ubuntu:focal as baseline + +# System packages. +RUN apt update -y && \ + DEBIAN_FRONTEND="noninteractive" apt install -y tzdata termshark && \ + apt install -y \ + apt-transport-https \ + axel \ + bash \ + binutils \ + bridge-utils \ + ca-certificates \ + coreutils \ + curl \ + gnupg \ + htop \ + iftop \ + iproute2 \ + iptables \ + iputils-ping \ + netcat \ + net-tools \ + nload \ + nmap \ + procps \ + python3 \ + python3-dev \ + python3-pip \ + sudo \ + wget \ + tcpdump \ + vim \ + && \ + apt clean -y +# Python packages. +RUN python3 -m pip install \ + scapy + +# VPP. +RUN bash -c "curl -L https://packagecloud.io/fdio/master/gpgkey | apt-key add -" && \ + bash -c "echo \"deb [trusted=yes] https://packagecloud.io/fdio/release/ubuntu focal main\" >> /etc/apt/sources.list.d/99fd.io.list" && \ + apt update && \ + apt install -y \ + vpp \ + vpp-plugin-core \ + vpp-plugin-dpdk \ + && \ + apt clean -y + +# Used by client/server entrypoint scripts. +ADD vpp_testbench_helpers.sh / + + +#------------------------------------------------------------------------------# +# Client image. +FROM baseline as client_img +# Enable a health probe. +ARG HEALTHCHECK_PORT=8080 +ENV HEALTHCHECK_PORT_RUNTIME="${HEALTHCHECK_PORT}" +HEALTHCHECK CMD curl --fail "http://localhost:$HEALTHCHECK_PORT_RUNTIME" || exit 1 +# Image-specific overrides. +ADD ./entrypoint_client.sh /entrypoint.sh +ENTRYPOINT ["/entrypoint.sh"] + + +#------------------------------------------------------------------------------# +# Server image. +FROM baseline as server_img +# Enable a health probe. +ARG HEALTHCHECK_PORT=8080 +ENV HEALTHCHECK_PORT_RUNTIME="${HEALTHCHECK_PORT}" +HEALTHCHECK CMD curl --fail "http://localhost:$HEALTHCHECK_PORT_RUNTIME" || exit 1 +# Image-specific overrides. +ADD ./entrypoint_server.sh /entrypoint.sh +ENTRYPOINT ["/entrypoint.sh"] + diff --git a/docs/usecases/vpp_testbench/src/Dockerfile.vpp_testbench.dockerignore b/docs/usecases/vpp_testbench/src/Dockerfile.vpp_testbench.dockerignore new file mode 100644 index 00000000000..0a39eeac666 --- /dev/null +++ b/docs/usecases/vpp_testbench/src/Dockerfile.vpp_testbench.dockerignore @@ -0,0 +1,14 @@ +#------------------------------------------------------------------------------# +# @brief: Dockerfile permit/deny-list for building the VPP testbench +# project. +# @author: Matthew Giassa <mgiassa@cisco.com> +# @copyright: (C) Cisco 2021. +#------------------------------------------------------------------------------# +# Ignore everything by default. Permit-list only. +* + +# Entrypoint scripts and other artifacts. +!entrypoint_client.sh +!entrypoint_server.sh +!vpp_testbench_helpers.sh + diff --git a/docs/usecases/vpp_testbench/src/Makefile b/docs/usecases/vpp_testbench/src/Makefile new file mode 100644 index 00000000000..4433edbe4d7 --- /dev/null +++ b/docs/usecases/vpp_testbench/src/Makefile @@ -0,0 +1,147 @@ +################################################################################ +# @brief: Makefile for building the VPP testbench example. +# @author: Matthew Giassa. +# @copyright: (C) Cisco 2021. +################################################################################ +#------------------------------------------------------------------------------# +# Constants and settings. +#------------------------------------------------------------------------------# +SHELL=/bin/bash +.DEFAULT_GOAL: all + +# Image names. +# TODO: semver2 format if we want to publish these to a registry. +DOCKER_CLIENT_IMG := vpp-testbench-client +DOCKER_CLIENT_REL := local +DOCKER_CLIENT_IMG_FULL := $(DOCKER_CLIENT_IMG):$(DOCKER_CLIENT_REL) +DOCKER_SERVER_IMG := vpp-testbench-server +DOCKER_SERVER_REL := local +DOCKER_SERVER_IMG_FULL := $(DOCKER_SERVER_IMG):$(DOCKER_SERVER_REL) +# Docker build-time settings (and run-time settings as well). +DOCKER_HEALTH_PROBE_PORT := $(shell bash -c ". vpp_testbench_helpers.sh; host_only_get_docker_health_probe_port") + +#------------------------------------------------------------------------------# +# Functions. +#------------------------------------------------------------------------------# +#------------------------------------------------------------------------------# +# Cleanup running containers, Docker networks, etc.; from previous runs. +define cleanup_everything + # Terminate the containers. + bash -c "\ + . vpp_testbench_helpers.sh; \ + host_only_kill_testbench_client_container $(DOCKER_CLIENT_IMG_FULL); \ + host_only_kill_testbench_server_container $(DOCKER_SERVER_IMG_FULL); \ + " + + # Cleanup Docker bridge network. + bash -c "\ + . vpp_testbench_helpers.sh; \ + host_only_destroy_docker_networks; \ + " +endef + +#------------------------------------------------------------------------------# +# Launch our containers and connect them to a private Docker network for +# testing. +define launch_testbench + # Create Docker bridge network. + bash -c "\ + . vpp_testbench_helpers.sh; \ + host_only_create_docker_networks; \ + " + + # Launch the containers. + bash -c "\ + . vpp_testbench_helpers.sh; \ + host_only_run_testbench_client_container $(DOCKER_CLIENT_IMG_FULL); \ + host_only_run_testbench_server_container $(DOCKER_SERVER_IMG_FULL); \ + " + + # Entrypoint scripts will bring up the various links. + # Use "docker ps" to check status of containers, see if their health + # probes are working as expected (i.e. "health"), etc. +endef + +#------------------------------------------------------------------------------# +# Goals. +#------------------------------------------------------------------------------# +#------------------------------------------------------------------------------# +# Default goal. +.PHONY: all +all: docker + @echo Done. + +#------------------------------------------------------------------------------# +# Build all docker images. +.PHONY: docker +docker: Dockerfile.vpp_testbench Dockerfile.vpp_testbench.dockerignore \ + entrypoint_client.sh entrypoint_server.sh \ + vpp_testbench_helpers.sh + # Client image. + DOCKER_BUILDKIT=1 docker build \ + --file Dockerfile.vpp_testbench \ + --build-arg HEALTHCHECK_PORT=$(DOCKER_HEALTH_PROBE_PORT) \ + --tag $(DOCKER_CLIENT_IMG_FULL) \ + --target client_img \ + . + # Server image. + DOCKER_BUILDKIT=1 docker build \ + --file Dockerfile.vpp_testbench \ + --build-arg HEALTHCHECK_PORT=$(DOCKER_HEALTH_PROBE_PORT) \ + --tag $(DOCKER_SERVER_IMG_FULL) \ + --target server_img \ + . + +#------------------------------------------------------------------------------# +# Execute end-to-end test via containers. +.PHONY: test +test: + # Cleanup anything from previous runs. + $(call cleanup_everything) + + # Launch our testbench. + $(call launch_testbench) + + # Final cleanup. + $(call cleanup_everything) + +#------------------------------------------------------------------------------# +# For manually cleaning up a test that fails partway through its execution. +.PHONY: clean +clean: + $(call cleanup_everything) + +#------------------------------------------------------------------------------# +# For manually launching our testbench for interactive testing. +.PHONY: start +start: + $(call launch_testbench) + +#------------------------------------------------------------------------------# +# For manually stopping (and cleaning up) our testbench. +.PHONY: stop +stop: + $(call cleanup_everything) + +#------------------------------------------------------------------------------# +# Create an interactive shell session connected to the client container (for +# manual testing). Typically preceded by "make start", and concluded with +# "make stop" after exiting the shell. +.PHONY: shell_client +shell_client: + bash -c "\ + . vpp_testbench_helpers.sh; \ + host_only_shell_client_container; \ + " + +#------------------------------------------------------------------------------# +# Create an interactive shell session connected to the server container (for +# manual testing). Typically preceded by "make start", and concluded with +# "make stop" after exiting the shell. +.PHONY: shell_server +shell_server: + bash -c "\ + . vpp_testbench_helpers.sh; \ + host_only_shell_server_container; \ + " + diff --git a/docs/usecases/vpp_testbench/src/entrypoint_client.sh b/docs/usecases/vpp_testbench/src/entrypoint_client.sh new file mode 100755 index 00000000000..432c2769730 --- /dev/null +++ b/docs/usecases/vpp_testbench/src/entrypoint_client.sh @@ -0,0 +1,150 @@ +#!/bin/bash +################################################################################ +# @brief: Launcher/entrypoint script plus helper functions for "client +# side" container in the VPP testbench. +# @author: Matthew Giassa <mgiassa@cisco.com> +# @copyright: (C) Cisco 2021. +################################################################################ + +################################################################################ +# Dependencies. +################################################################################ +# Import common settings for server and client. This is supplied via the +# Dockerfile build. +# shellcheck disable=SC1091 +. vpp_testbench_helpers.sh + +################################################################################ +# Globals. +################################################################################ +# VPP instance socket. +export VPP_SOCK=/run/vpp/vpp.testbench-client.sock +# Alias for vppctl that uses the correct socket name. +export VPPCTL="vppctl -s ${VPP_SOCK}" +# Our "Docker bridge network". Don't change this value. +export NET_IF_DOCKER="eth0" +# Name of link associated with our VXLAN. +export LINK_VXLAN_LINUX="vxlan-vid-${VXLAN_ID_LINUX}" + +################################################################################ +# Function definitions. +################################################################################ +#------------------------------------------------------------------------------# +# @brief: Alias for vppctl (knowing which API socket to use). +function vc() +{ + vppctl -s "${VPP_SOCK}" "${@}" +} + +#------------------------------------------------------------------------------# +# @brief: Used to initialize/configure the client container once it's up and +# running. +function context_create() +{ + set -x + echo "Running client. Host: $(hostname)" + local mtu + + # Setup VXLAN overlay. + ip link add "${LINK_VXLAN_LINUX}" \ + type vxlan \ + id "${VXLAN_ID_LINUX}" \ + dstport "${VXLAN_PORT}" \ + local "${CLIENT_BRIDGE_IP_DOCKER}" \ + group "${MC_VXLAN_ADDR_LINUX}" \ + dev "${NET_IF_DOCKER}" \ + ttl 1 + ip link set "${LINK_VXLAN_LINUX}" up + ip addr add "${CLIENT_VXLAN_IP_LINUX}/${MASK_VXLAN_LINUX}" dev "${LINK_VXLAN_LINUX}" + + # Get MTU of interface. VXLAN must use a smaller value due to overhead. + mtu="$(cat /sys/class/net/${NET_IF_DOCKER}/mtu)" + + # Decrease VXLAN MTU. This should already be handled for us by iproute2, but + # just being cautious. + ip link set dev "${LINK_VXLAN_LINUX}" mtu "$((mtu - 50))" + + # Bring-up VPP and create tap interfaces and VXLAN tunnel. + vpp \ + unix '{' log /tmp/vpp1.log full-coredump cli-listen ${VPP_SOCK} '}' \ + api-segment '{' prefix vpp1 '}' \ + api-trace '{' on '}' \ + dpdk '{' uio-driver uio_pci_generic no-pci '}' + + # Wait for VPP to come up. + while ! ${VPPCTL} show log; do + sleep 1 + done + + # Bring up the memif interface and assign an IP to it. + ${VPPCTL} create interface memif id 0 slave + sleep 1 + ${VPPCTL} set int state memif0/0 up + ${VPPCTL} set int ip address memif0/0 "${CLIENT_VPP_MEMIF_IP}/${VPP_MEMIF_NM}" + + # Create VPP-controlled tap interface bridged to the memif. + ${VPPCTL} create tap id 0 host-if-name vpp-tap-0 + sleep 1 + ${VPPCTL} set interface state tap0 up + ip addr add "${CLIENT_VPP_TAP_IP_MEMIF}/${VPP_TAP_NM}" dev vpp-tap-0 + ${VPPCTL} set interface l2 bridge tap0 "${VPP_BRIDGE_DOMAIN_TAP}" + ${VPPCTL} set interface l2 bridge memif0/0 "${VPP_BRIDGE_DOMAIN_TAP}" +} + +#------------------------------------------------------------------------------# +# @brief: Used to shutdown/cleanup the client container. +function context_destroy() +{ + # OS will reclaim interfaces and resources when container is terminated. + : +} + +#------------------------------------------------------------------------------# +# @brief: Client worker loop to keep the container alive. Just idles. +function context_loop() +{ + # Sleep indefinitely (to keep container alive for testing). + tail -f /dev/null +} + +#------------------------------------------------------------------------------# +# @brief: Launches a minimalistic web server via netcat. The Dockerfile +# associated with this project is configured to treat the web server +# replying with "200 OK" as a sort of simple health probe. +function health_check_init() +{ + while true; do + echo -e "HTTP/1.1 200 OK\n\nHOST:$(hostname)\nDATE:$(date)" \ + | nc -l -p "${DOCKER_HEALTH_PROBE_PORT}" -q 1 + done +} + +#------------------------------------------------------------------------------# +# @brief: Main/default entry point. +function main() +{ + # Make sure we always cleanup. + trap context_destroy EXIT + + # Bring up interfaces. + context_create + + # Enable health check responder. + health_check_init & + + # Enter our worker loop. + context_loop +} + +#------------------------------------------------------------------------------# +# Script is generally intended to be sourced and individual functions called. +# If just run as a standalone script, assume it's being used as the entrypoint +# for a Docker container. +if [ "${BASH_SOURCE[0]}" -ef "$0" ]; then + # Being run. Launch main. + main "${@}" +else + # Being sourced. Do nothing. + : +fi + diff --git a/docs/usecases/vpp_testbench/src/entrypoint_server.sh b/docs/usecases/vpp_testbench/src/entrypoint_server.sh new file mode 100755 index 00000000000..755472a72bf --- /dev/null +++ b/docs/usecases/vpp_testbench/src/entrypoint_server.sh @@ -0,0 +1,176 @@ +#!/bin/bash +################################################################################ +# @brief: Launcher/entrypoint script plus helper functions for "server +# side" container in the VPP testbench. +# @author: Matthew Giassa <mgiassa@cisco.com> +# @copyright: (C) Cisco 2021. +################################################################################ + +################################################################################ +# Dependencies. +################################################################################ +# Import common settings for server and client. This is supplied via the +# Dockerfile build. +# shellcheck disable=SC1091 +. vpp_testbench_helpers.sh + +################################################################################ +# Globals. +################################################################################ +# VPP instance socket. +export VPP_SOCK=/run/vpp/vpp.testbench-server.sock +# Alias for vppctl that uses the correct socket name. +export VPPCTL="vppctl -s ${VPP_SOCK}" +# Our "Docker bridge network". Don't change this value. +export NET_IF_DOCKER="eth0" +# Name of link associated with our VXLAN. +export LINK_VXLAN_LINUX="vxlan-vid-${VXLAN_ID_LINUX}" + +################################################################################ +# Function definitions. +################################################################################ +#------------------------------------------------------------------------------# +# @brief: Alias for vppctl (knowing which API socket to use). +function vc() +{ + vppctl -s "${VPP_SOCK}" "${@}" +} + +#------------------------------------------------------------------------------# +# @brief: Used to initialize/configure the server container once it's up and +# running. +function context_create() +{ + set -x + echo "Running server. Host: $(hostname)" + local mtu + + # Setup VXLAN overlay. + ip link add "${LINK_VXLAN_LINUX}" \ + type vxlan \ + id "${VXLAN_ID_LINUX}" \ + dstport "${VXLAN_PORT}" \ + local "${SERVER_BRIDGE_IP_DOCKER}" \ + group "${MC_VXLAN_ADDR_LINUX}" \ + dev "${NET_IF_DOCKER}" \ + ttl 1 + ip link set "${LINK_VXLAN_LINUX}" up + ip addr add "${SERVER_VXLAN_IP_LINUX}/${MASK_VXLAN_LINUX}" dev "${LINK_VXLAN_LINUX}" + + # Get MTU of interface. VXLAN must use a smaller value due to overhead. + mtu="$(cat /sys/class/net/${NET_IF_DOCKER}/mtu)" + + # Decrease VXLAN MTU. This should already be handled for us by iproute2, but + # just being cautious. + ip link set dev "${LINK_VXLAN_LINUX}" mtu "$((mtu - 50))" + + # Bring-up VPP and create tap interfaces and VXLAN tunnel. + vpp \ + unix '{' log /tmp/vpp1.log full-coredump cli-listen ${VPP_SOCK} '}' \ + api-segment '{' prefix vpp1 '}' \ + api-trace '{' on '}' \ + dpdk '{' uio-driver uio_pci_generic no-pci '}' + + # Wait for VPP to come up. + while ! ${VPPCTL} show log; do + sleep 1 + done + + # Bring up the memif interface and assign an IP to it. + ${VPPCTL} create interface memif id 0 master + sleep 1 + ${VPPCTL} set int state memif0/0 up + ${VPPCTL} set int ip address memif0/0 "${SERVER_VPP_MEMIF_IP}/${VPP_MEMIF_NM}" + + # Create VPP-controlled tap interface bridged to the memif. + ${VPPCTL} create tap id 0 host-if-name vpp-tap-0 + sleep 1 + ${VPPCTL} set interface state tap0 up + ip addr add "${SERVER_VPP_TAP_IP_MEMIF}/${VPP_TAP_NM}" dev vpp-tap-0 + ${VPPCTL} set interface l2 bridge tap0 "${VPP_BRIDGE_DOMAIN_TAP}" + ${VPPCTL} set interface l2 bridge memif0/0 "${VPP_BRIDGE_DOMAIN_TAP}" +} + +#------------------------------------------------------------------------------# +# @brief: Used to shutdown/cleanup the server container. +function context_destroy() +{ + # OS will reclaim interfaces and resources when container is terminated. + : +} + +#------------------------------------------------------------------------------# +# @brief: Server worker loop to keep the container alive. Just idles. +function context_loop() +{ + # Sleep indefinitely (to keep container alive for testing). + tail -f /dev/null +} + +#------------------------------------------------------------------------------# +# @brief: Launches a minimalistic web server via netcat. The Dockerfile +# associated with this project is configured to treat the web server +# replying with "200 OK" as a sort of simple health probe. +function health_check_init() +{ + while true; do + echo -e "HTTP/1.1 200 OK\n\nHOST:$(hostname)\nDATE:$(date)" \ + | nc -l -p "${DOCKER_HEALTH_PROBE_PORT}" -q 1 + done +} + +#------------------------------------------------------------------------------# +# @brief: Launches a minimalistic web server via netcat. This instance is +# meant to bind to the Linux VXLAN tunnel we create. +function web_server_vxlan_linux() +{ + while true; do + echo -e "HTTP/1.1 200 OK\n\nHOST:$(hostname)\nDATE:$(date)\nHello from the Linux interface." \ + | nc -l -s "${SERVER_VXLAN_IP_LINUX}" -p 8000 -q 1 + done +} + +#------------------------------------------------------------------------------# +# @brief: Launches a minimalistic web server via netcat. This instance is +# meant to bind to the VPP VXLAN tunnel we create. +function web_server_vpp_tap() +{ + while true; do + echo -e "HTTP/1.1 200 OK\n\nHOST:$(hostname)\nDATE:$(date)\nHello from the VPP interface." \ + | nc -l -s "${SERVER_VPP_TAP_IP_MEMIF}" -p 8000 -q 1 + done +} + +#------------------------------------------------------------------------------# +# @brief: Main/default entry point. +function main() +{ + # Make sure we always cleanup. + trap context_destroy EXIT + + # Bring up interfaces. + context_create + + # Enable health check responder. + health_check_init & + + # Bring up test web servers. + web_server_vxlan_linux & + web_server_vpp_tap & + + # Enter our worker loop. + context_loop +} + +#------------------------------------------------------------------------------# +# Script is generally intended to be sourced and individual functions called. +# If just run as a standalone script, assume it's being used as the entrypoint +# for a Docker container. +if [ "${BASH_SOURCE[0]}" -ef "$0" ]; then + # Being run. Launch main. + main "${@}" +else + # Being sourced. Do nothing. + : +fi + diff --git a/docs/usecases/vpp_testbench/src/vpp_testbench_helpers.sh b/docs/usecases/vpp_testbench/src/vpp_testbench_helpers.sh new file mode 100755 index 00000000000..7dfb646a1db --- /dev/null +++ b/docs/usecases/vpp_testbench/src/vpp_testbench_helpers.sh @@ -0,0 +1,273 @@ +#!/bin/bash +################################################################################ +# @brief: Helper functions for the VPP testbench project. +# NOTE: functions prefixed with "host_only" are functions +# intended to be executed on the host OS, **outside** of the +# Docker containers. These are typically functions for bring-up +# (i.e. creating the Docker networks, launching/terminating the +# Docker containers, etc.). If a function is not prefixed with +# "host_only", assume that the function/value/etc. is intended +# for use within the Docker containers. We could maybe re-factor +# this in the future so "host_only" functions live in a separate +# file. +# @author: Matthew Giassa <mgiassa@cisco.com> +# @copyright: (C) Cisco 2021. +################################################################################ + +# Meant to be sourced, not executed directly. +if [ "${BASH_SOURCE[0]}" -ef "$0" ]; then + echo "This script is intended to be sourced, not run. Aborting." + false + exit +fi + +#------------------------------------------------------------------------------# +# For tests using the Linux kernel network stack. +#------------------------------------------------------------------------------# +# Health check probe port for all containers. +export DOCKER_HEALTH_PROBE_PORT="8123" +# Docker bridge network settings. +export CLIENT_BRIDGE_IP_DOCKER="169.254.0.1" +export SERVER_BRIDGE_IP_DOCKER="169.254.0.2" +export BRIDGE_NET_DOCKER="169.254.0.0/24" +export BRIDGE_GW_DOCKER="169.254.0.254" +# Overlay IP addresses. +export CLIENT_VXLAN_IP_LINUX="169.254.10.1" +export SERVER_VXLAN_IP_LINUX="169.254.10.2" +export MASK_VXLAN_LINUX="24" +export VXLAN_ID_LINUX="42" +# IANA (rather than Linux legacy port value). +export VXLAN_PORT="4789" + +# Docker network we use to bridge containers. +export DOCKER_NET="vpp-testbench-net" +# Docker container names for client and server (runtime aliases). +export DOCKER_CLIENT_HOST="vpp-testbench-client" +export DOCKER_SERVER_HOST="vpp-testbench-server" +# Some related variables have to be computed at the last second, so they +# are not all defined up-front. +export CLIENT_VPP_NETNS_DST="/var/run/netns/${DOCKER_CLIENT_HOST}" +export SERVER_VPP_NETNS_DST="/var/run/netns/${DOCKER_SERVER_HOST}" + +# VPP options. +# These can be arbitrarily named. +export CLIENT_VPP_HOST_IF="vpp1" +export SERVER_VPP_HOST_IF="vpp2" +# Putting VPP interfaces on separate subnet from Linux-stack i/f. +export CLIENT_VPP_MEMIF_IP="169.254.11.1" +export SERVER_VPP_MEMIF_IP="169.254.11.2" +export VPP_MEMIF_NM="24" +export CLIENT_VPP_TAP_IP_MEMIF="169.254.12.1" +export SERVER_VPP_TAP_IP_MEMIF="169.254.12.2" +export VPP_TAP_NM="24" +# Bridge domain ID (for VPP tap + VXLAN interfaces). Arbitrary. +export VPP_BRIDGE_DOMAIN_TAP="1000" + +# VPP socket path. Make it one level "deeper" than the "/run/vpp" that is used +# by default, so our containers don't accidentally connect to an instance of +# VPP running on the host OS (i.e. "/run/vpp/vpp.sock"), and hang the system. +export VPP_SOCK_PATH="/run/vpp/containers" + +#------------------------------------------------------------------------------# +# @brief: Converts an integer value representation of a VXLAN ID to a +# VXLAN IPv4 multicast address (string represenation). This +# effectively sets the first octet to "239" and the remaining 3x +# octets to the IP-address equivalent of a 24-bit value. +# Assumes that it's never supplied an input greater than what a +# 24-bit unsigned integer can hold. +function vxlan_id_to_mc_ip() +{ + if [ $# -ne 1 ]; then + echo "Sanity failure." + false + exit + fi + + local id="${1}" + local a b c d ret + a="239" + b="$(((id>>16) & 0xff))" + c="$(((id>>8) & 0xff))" + d="$(((id) & 0xff))" + ret="${a}.${b}.${c}.${d}" + + echo "${ret}" + true +} +# Multicast address for VXLAN. Treat the lower three octets as the 24-bit +# representation of the VXLAN ID for ease-of-use (use-case specific, not +# necessarily an established rule/protocol). +MC_VXLAN_ADDR_LINUX="$(vxlan_id_to_mc_ip ${VXLAN_ID_LINUX})" +export MC_VXLAN_ADDR_LINUX + +#------------------------------------------------------------------------------# +# @brief: Get'er function (so makefile can re-use common values from this +# script, and propagate them down to the Docker build operations +# and logic within the Dockerfile; "DRY"). +function host_only_get_docker_health_probe_port() +{ + echo "${DOCKER_HEALTH_PROBE_PORT}" +} + +#------------------------------------------------------------------------------# +# @brief: Creates the Docker bridge network used to connect the +# client and server testbench containers. +function host_only_create_docker_networks() +{ + # Create network (bridge for VXLAN). Don't touch 172.16/12 subnet, as + # Docker uses it by default for its own overlay functionality. + docker network create \ + --driver bridge \ + --subnet=${BRIDGE_NET_DOCKER} \ + --gateway=${BRIDGE_GW_DOCKER} \ + "${DOCKER_NET}" +} + +#------------------------------------------------------------------------------# +# @brief: Destroys the Docker bridge network for connecting the +# containers. +function host_only_destroy_docker_networks() +{ + docker network rm "${DOCKER_NET}" || true +} + +#------------------------------------------------------------------------------# +# @brief: Bringup/dependency helper for VPP. +function host_only_create_vpp_deps() +{ + # Create area for VPP sockets and mount points, if it doesn't already + # exist. Our containers need access to this path so they can see each + # others' respective sockets so we can bind them together via memif. + sudo mkdir -p "${VPP_SOCK_PATH}" +} + +#------------------------------------------------------------------------------# +# @brief: Launches the testbench client container. +function host_only_run_testbench_client_container() +{ + # Sanity check. + if [ $# -ne 1 ]; then + echo "Sanity failure." + false + exit + fi + + # Launch container. Mount the local PWD into the container too (so we can + # backup results). + local image_name="${1}" + docker run -d --rm \ + --cap-add=NET_ADMIN \ + --cap-add=SYS_NICE \ + --cap-add=SYS_PTRACE \ + --device=/dev/net/tun:/dev/net/tun \ + --device=/dev/vfio/vfio:/dev/vfio/vfio \ + --device=/dev/vhost-net:/dev/vhost-net \ + --name "${DOCKER_CLIENT_HOST}" \ + --volume="$(pwd):/work:rw" \ + --volume="${VPP_SOCK_PATH}:/run/vpp:rw" \ + --network name="${DOCKER_NET},ip=${CLIENT_BRIDGE_IP_DOCKER}" \ + --workdir=/work \ + "${image_name}" +} + +#------------------------------------------------------------------------------# +# @brief: Launches the testbench server container. +function host_only_run_testbench_server_container() +{ + # Sanity check. + if [ $# -ne 1 ]; then + echo "Sanity failure." + false + exit + fi + + # Launch container. Mount the local PWD into the container too (so we can + # backup results). + local image_name="${1}" + docker run -d --rm \ + --cap-add=NET_ADMIN \ + --cap-add=SYS_NICE \ + --cap-add=SYS_PTRACE \ + --device=/dev/net/tun:/dev/net/tun \ + --device=/dev/vfio/vfio:/dev/vfio/vfio \ + --device=/dev/vhost-net:/dev/vhost-net \ + --name "${DOCKER_SERVER_HOST}" \ + --volume="${VPP_SOCK_PATH}:/run/vpp:rw" \ + --network name="${DOCKER_NET},ip=${SERVER_BRIDGE_IP_DOCKER}" \ + "${image_name}" +} + +#------------------------------------------------------------------------------# +# @brief: Terminates the testbench client container. +function host_only_kill_testbench_client_container() +{ + docker kill "${DOCKER_CLIENT_HOST}" || true + docker rm "${DOCKER_CLIENT_HOST}" || true +} + +#------------------------------------------------------------------------------# +# @brief: Terminates the testbench server container. +function host_only_kill_testbench_server_container() +{ + docker kill "${DOCKER_SERVER_HOST}" || true + docker rm "${DOCKER_SERVER_HOST}" || true +} + +#------------------------------------------------------------------------------# +# @brief: Launches an interactive shell in the client container. +function host_only_shell_client_container() +{ + docker exec -it "${DOCKER_CLIENT_HOST}" bash --init-file /entrypoint.sh +} + +#------------------------------------------------------------------------------# +# @brief: Launches an interactive shell in the server container. +function host_only_shell_server_container() +{ + docker exec -it "${DOCKER_SERVER_HOST}" bash --init-file /entrypoint.sh +} + +#------------------------------------------------------------------------------# +# @brief: Determines the network namespace or "netns" associated with a +# running Docker container, and then creates a network interface +# in the default/host netns, and moves it into the netns +# associated with the container. +function host_only_move_host_interfaces_into_container() +{ + # NOTE: this is only necessary if we want to create Linux network + # interfaces while working in the default namespace, and then move them + # into container network namespaces. + # In earlier versions of this code, we did such an operation, but now we + # just create the interfaces inside the containers themselves (requires + # CAP_NET_ADMIN, or privileged containers, which we avoid). This is left + # here as it's occasionally useful for debug purposes (or might become a + # mini-lab itself). + + # Make sure netns path exists. + sudo mkdir -p /var/run/netns + + # Mount container network namespaces so that they are accessible via "ip + # netns". Ignore "START_OF_SCRIPT": just used to make + # linter-compliant text indentation look nicer. + DOCKER_CLIENT_PID=$(docker inspect -f '{{.State.Pid}}' ${DOCKER_CLIENT_HOST}) + DOCKER_SERVER_PID=$(docker inspect -f '{{.State.Pid}}' ${DOCKER_SERVER_HOST}) + CLIENT_VPP_NETNS_SRC=/proc/${DOCKER_CLIENT_PID}/ns/net + SERVER_VPP_NETNS_SRC=/proc/${DOCKER_SERVER_PID}/ns/net + sudo ln -sfT "${CLIENT_VPP_NETNS_SRC}" "${CLIENT_VPP_NETNS_DST}" + sudo ln -sfT "${SERVER_VPP_NETNS_SRC}" "${SERVER_VPP_NETNS_DST}" + + # Move these interfaces into the namespaces of the containers and assign an + # IPv4 address to them. + sudo ip link set dev "${CLIENT_VPP_HOST_IF}" netns "${DOCKER_CLIENT_NETNS}" + sudo ip link set dev "${SERVER_VPP_HOST_IF}" netns "${DOCKER_SERVER_NETNS}" + docker exec ${DOCKER_CLIENT_HOST} ip a + docker exec ${DOCKER_SERVER_HOST} ip a + + # Bring up the links and assign IP addresses. This must be done + # **after** moving the interfaces to a new netns, as we might have a + # hypothetical use case where we assign the same IP to multiple + # interfaces, which would be a problem. This collision issue isn't a + # problem though if the interfaces are in separate network namespaces + # though. +} + |