Use docker containers as hosts for testing netplugin

dockerhost/README.md

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+The multi node container networking can now be tested on a single VM by running docker inside docker. 
+https://blog.docker.com/2013/09/docker-can-now-run-within-docker/
+
+The outside docker containers act like physical hosts in our test and are connected using a standard linux bridge. Inside each "host container" we run a namespaced instance of docker, OVS , etcd and netplugin instance. One can now launch containers from within each "host containers" and use netplugin networking to connect them. 
+
+The steps to launch docker hosts are : 
+
+1. Compile the netplugin code
+2. Change user to root
+3. Set GOPATH to root of the netplugin code 
+4. Add $GOPATH/dockerhost to PATH
+5. Set CONTIV_NODES to required number of nodes
+6. Run start-dockerhosts
+
+This will start CONTIV_NODES number of containers with docker image called ubuntu_netplugin which is just ubuntu image with docker and ovs installed. 
+
+Now start a shell within any of the "host containers" using following convenient wrapper around nsenter : 
+```
+docker-sh netplugin-node<x>
+```
+
+Start netplugin, post netplugin config and launch containers inside the "host containers" the same way you do on VMs. 
+Note : currently the demo is working only if config is posted before containers are started .. need to debug why the reverse is not working. 
+
+To cleanup all the docker hosts and the virtual interfaces created do 
+  ```
+  cleanup-dockerhosts
+  ```
+
+Example for testing TwoHostMultiVlan you can do : 
+
+1. Launch the two host containers
+
+  ```
+  export CONTIV_NODES=2
+  start-dockerhosts
+  ```
+
+2. Load the netplugin configuration
+  ```
+  docker-sh netplugin-node1
+  /netplugin/bin/netdcli -cfg /netplugin/examples/two_hosts_multiple_vlans_nets.json
+  ```
+
+3. Launch container1 on host1
+
+  ```
+  docker-sh netplugin-node1
+  docker run -it --name=myContainer1 --hostname=myContainer1 ubuntu /bin/bash
+  ```
+
+4. Launch container3 on host2
+
+  ```
+  docker-sh netplugin-node2
+  docker run -it --name=myContainer3 --hostname=myContainer1 ubuntu /bin/bash
+  ```
+
+5. Test connectivity between the containers using ping. Go to the shell for container1
+  ```
+  root@myContainer1:/# ping -c3 11.1.2.2
+PING 11.1.2.2 (11.1.2.2) 56(84) bytes of data.
+64 bytes from 11.1.2.2: icmp_seq=1 ttl=64 time=3.15 ms
+64 bytes from 11.1.2.2: icmp_seq=2 ttl=64 time=1.36 ms
+  ```
+

dockerhost/cleanup-dockerhosts

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+
+#!/bin/bash
+
+num_nodes=1
+if [ -z "$CONTIV_NODES" ];
+then 
+    num_nodes=1
+else
+    num_nodes=$CONTIV_NODES
+fi
+echo $num_nodes
+
+for i in `seq 1 $num_nodes`; 
+do
+    hostname="netplugin-node$i"
+    echo "Cleaning $hostname"
+    docker exec $hostname service docker stop
+    docker rm -f $hostname
+    ip link delete $i-ext
+done

dockerhost/create_loop_devices.sh

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+#!/bin/bash
+for i in `seq 9 20`;
+do
+    sudo /bin/mknod -m640 /dev/loop$i b 7 $i
+    sudo /bin/chown root:disk /dev/loop$i
+done

dockerhost/docker-ip

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+#!/bin/sh
+
+exec docker inspect --format '{{ .NetworkSettings.IPAddress }}' "$@"

dockerhost/docker-pid

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+#!/bin/sh
+
+exec docker inspect --format '{{ .State.Pid }}' "$@"

dockerhost/docker-sh

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+#!/bin/bash
+nsenter --target $(docker-pid $1) --mount --uts --ipc --net --pid

dockerhost/start-dockerhosts

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+#!/bin/bash
+
+# Create a linux bridge between containers
+brctl addbr br-em1
+ip link set br-em1 up
+
+num_nodes=1
+if [ -z "$CONTIV_NODES" ];
+then 
+    num_nodes=1
+else
+    num_nodes=$CONTIV_NODES
+fi
+echo $num_nodes
+
+if [ -z "$GOPATH" ];
+then 
+    echo "GOPATH needs to be set"
+    exit
+else
+    netplugin_path=$GOPATH
+fi
+cluster=""
+first="true"
+for i in `seq 1 $num_nodes`; 
+do
+    hostname="netplugin-node$i"
+    echo "Starting $hostname"
+    docker run -d -i -t --name $hostname --privileged -v /var/lib/docker -v $netplugin_path:/netplugin sachja/ubuntu_netplugin bash -c "/netplugin/dockerhost/start-service.sh & bash"
+    nsenter -t $(docker-pid $hostname) -n hostname $hostname
+    ip link add $i-int type veth peer name $i-ext
+    brctl addif br-em1 $i-ext
+    ip link set netns $(docker-pid $hostname) dev $i-int
+    nsenter -t $(docker-pid $hostname) -n ip link set dev $i-int name eth2
+    nsenter -t $(docker-pid $hostname) -n ip link set eth2 up
+    if [ $i -gt "1" ]; then
+	cluster=$cluster",";
+    fi
+    docker exec $hostname service docker start
+    addr=$(docker-ip $hostname)
+    cluster=$cluster$hostname"=http://"$addr":2380"
+    first="false"
+done
+
+echo $cluster
+
+for i in `seq 1 $num_nodes`; 
+do
+    hostname="netplugin-node$i"
+    echo "Starting etcd on $hostname"
+    addr=$(docker-ip $hostname)
+    docker exec $hostname etcd -name $hostname -data-dir /opt/etcd -listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001 -advertise-client-urls http://$addr:2379,http://$addr:4001 -initial-advertise-peer-urls http://$addr:2380 -listen-peer-urls http://$addr:2380 -initial-cluster $cluster -initial-cluster-state new &
+done
+
+for i in `seq 1 $num_nodes`; 
+do
+    hostname="netplugin-node$i"
+    echo "Starting netplugin on $hostname"
+    docker exec $hostname /netplugin/bin/netplugin -host-label host$i &
+done

dockerhost/start-service.sh

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+#!/bin/bash
+/etc/init.d/openvswitch-switch restart
+while true
+do
+    echo service is running >> service.log
+    sleep 10
+done