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| -rw-r--r-- | docs/usecases/container_test.md | 130 |
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diff --git a/docs/usecases/container_test.md b/docs/usecases/container_test.md index a661d9cd3d5..c6b48dc8d07 100644 --- a/docs/usecases/container_test.md +++ b/docs/usecases/container_test.md @@ -508,3 +508,133 @@ dhcp traffic spew: The "|| true" bit keeps going if eth1 already has the indicated ipv6 address. + +Container / Host Interoperation +=============================== + +Host / container interoperation is highly desirable. If the host and a +set of containers don't run the same distro _and distro version_, it's +reasonably likely that the glibc versions won't match. That, in turn, +makes vpp binaries built in one environment fail in the other. + +Trying to install multiple versions of glibc - especially at the host +level - often ends very badly and is _not recommended_. It's not just +glibc, either. The dynamic loader ld-linux-xxx-so.2 is glibc version +specific. + +Fortunately, it's reasonable easy to build lxd container images based on +specific Ubuntu or Debian versions. + +### Create a custom root filesystem image + +First, install the "debootstrap" tool: + +``` + sudo apt-get install debootstrap +``` + +Make a temp directory, and use debootstrap to populate it. In this +example, we create an Ubuntu 20.04 (focal fossa) base image: + +``` + # mkdir /tmp/myroot + # debootstrap focal /tmp/myroot http://archive.ubuntu.com/ubuntu +``` + +To tinker with the base image (if desired): + +``` + # chroot /tmp/myroot + <add packages, etc.> + # exit +``` + +Make a compressed tarball of the base image: + +``` + # tar zcf /tmp/rootfs.tar.gz -C /tmp/myroot . +``` + +Create a "metadata.yaml" file which describes the base image: + +``` + architecture: "x86_64" + # To get current date in Unix time, use `date +%s` command + creation_date: 1458040200 + properties: + architecture: "x86_64" + description: "My custom Focal Fossa image" + os: "Ubuntu" + release: "focal" +``` + +Make a compressed tarball of metadata.yaml: + +``` + # tar zcf metadata.tar.gz metadata.yaml +``` + +Import the image into lxc / lxd: + +``` + $ lxc image import metadata.tar.gz rootfd.tar.gz --alias focal-base +``` + +### Create a container which uses the customized base image: + +``` + $ lxc launch focal-base focaltest + $ lxc exec focaltest bash +``` + +The next several steps should be executed in the container, in the +bash shell spun up by "lxc exec..." + +### Configure container networking + +In the container, create /etc/netplan/50-cloud-init.yaml: + +``` + network: + version: 2 + ethernets: + eth0: + dhcp4: true +``` + +Use "cat > /etc/netplan/50-cloud-init.yaml", and cut-'n-paste if your +favorite text editor is AWOL. + +Apply the configuration: + +``` + # netplan apply +``` + +At this point, eth0 should have an ip address, and you should see +a default route with "route -n". + +### Configure apt + +Again, in the container, set up /etc/apt/sources.list via cut-'n-paste +from a recently update "focal fossa" host. Something like so: + +``` + deb http://us.archive.ubuntu.com/ubuntu/ focal main restricted + deb http://us.archive.ubuntu.com/ubuntu/ focal-updates main restricted + deb http://us.archive.ubuntu.com/ubuntu/ focal universe + deb http://us.archive.ubuntu.com/ubuntu/ focal-updates universe + deb http://us.archive.ubuntu.com/ubuntu/ focal multiverse + deb http://us.archive.ubuntu.com/ubuntu/ focal-updates multiverse + deb http://us.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse + deb http://security.ubuntu.com/ubuntu focal-security main restricted + deb http://security.ubuntu.com/ubuntu focal-security universe + deb http://security.ubuntu.com/ubuntu focal-security multiverse +``` + +"apt-get update" and "apt-install" should produce reasonable results. +Suggest "apt-get install make git". + +At this point, you can use the "/scratch" sharepoint (or similar) to +execute "make install-dep install-ext-deps" to set up the container +with the vpp toolchain; proceed as desired. |