1 files changed, 63 insertions, 0 deletions
diff --git a/docker/utils.sh b/docker/utils.sh
new file mode 100755
index 000000000..7b4674752
--- /dev/null
+++ b/docker/utils.sh
@@ -0,0 +1,63 @@
+#!/bin/bash
+
+# Creates named container from given image.
+#
+# $1 - container name
+# $2 - image name
+#
+function create_container {
+  container_name=$1
+  image_name=$2
+  echo "Creating $container_name from $image_name"
+  docker run -dt --privileged --name=$container_name $image_name
+}
+
+# Starts container
+# and adds container's network namespace
+# to the linux runtime data (/var/run).
+#
+# $1 - container name
+#
+# See:
+# https://platform9.com/blog/container-namespaces-deep-dive-container-networking/
+#
+function start_container {
+  container_name=$1
+  echo "Starting container $container_name"
+
+  # Remove namespace if it was present
+  ip netns del $container_name
+
+  # Start container
+  docker start $container_name
+
+  # Make container's network namespaces accessible using ip netns
+  pid=$(docker inspect -f '{{.State.Pid}}' $container_name)
+  ln -s /proc/$pid/ns/net /var/run/netns/$container_name
+  echo "Container $container_name started sucessfully (pid=$pid)"
+}
+
+# Links two containers using a veth pair.
+#
+# $1 - name of the container A
+# $2 - name of the veth endpoint that belongs to A
+# $3 - name of the veth endpoint that belongs to B
+# $4 - name of the container B
+#
+function create_link {
+  container1=$1
+  if1=$2
+  if2=$3
+  container2=$4
+  echo "Creating link from $container1($if1) to $container2($if2)"
+  ip link add $if1 type veth peer name $if2
+
+  # Move veth endpoints to corresponding namespaces
+  ip link set $if1 netns $container1
+  ip link set $if2 netns $container2
+
+  # Bring interfaces up
+  ip netns exec $container1 ip link set $if1 up
+  ip netns exec $container2 ip link set $if2 up
+  echo "Link created successfully"
+}