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TwoHostMultiVlanDemo.md

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In this example we will simulate a two host cluster (with the two hosts being simulated by two vagrant vms) and deploy a multi vlan configuration on them. The logical topology looks similar to one shown below:

VlanNetwork

  1. Launch the two node setup:

    cd $GOPATH/src/github.com/contiv/netplugin
CONTIV_NODES=2 make build demo

    Note: User may simulate more hosts by setting the CONTIV_NODES variable to a desired number. Each host corresponds to a vagrant-vm, which are connected through their 'eth2' interface to a virtualbox bridge network for the container data traffic.

  2. Once the make is done, start a separate ssh session to each node and run the netplugin:

    CONTIV_NODES=2 vagrant ssh netplugin-node1
sudo $GOPATH/bin/netmaster &
sudo $GOPATH/bin/netplugin -host-label host1 &

    CONTIV_NODES=2 vagrant ssh netplugin-node2
sudo $GOPATH/bin/netplugin -host-label host2 &

  3. Load the multi-host multi vlan configuration from the ../examples/two_hosts_multiple_vlans_nets.json file by issuing the following commands from one of the vagrant vms.

    CONTIV_NODES=2 vagrant ssh netplugin-node1
cd $GOPATH/src/github.com/contiv/netplugin
netdcli -cfg examples/two_hosts_multiple_vlans_nets.json

  4. Launch 4 containers, two on each vagrant node that we will add to the two networks viz. orange and purple

    On netplugin-node1:

    sudo docker run -itd --name=myContainer1 --hostname=myContainer1 ubuntu /bin/bash
sudo docker run -itd --name=myContainer2 --hostname=myContainer2 ubuntu /bin/bash

    On netplugin-node2:

    sudo docker run -itd --name=myContainer3 --hostname=myContainer3 ubuntu /bin/bash
sudo docker run -itd --name=myContainer4 --hostname=myContainer4 ubuntu /bin/bash

  5. Now everything should be setup as per the diagram and we are good to test the connectivity.

    On netplugin-node1:

    # ping from myContainer1 to myContainer3 should succeed (both belonging to orange network)
$ docker exec -it myContainer1 /bin/bash
< inside the container >
$ ip addr
$ ping 11.1.0.2

# ping from myContainer2 to myContainer4 should also succeed (both belonging to purple network)
$ docker exec -it myContainer4 /bin/bash
< inside the container >
$ ip addr
$ ping 11.1.1.2

# ping between containers belonging to different networks would fail
# unless they belong to the same tenant and routing is enabled.

Trying out VXLAN network is similar, except using examples/two_hosts_multiple_vxlan_nets.json configuration file instead, and it emulates the connectivity as in the following diagram:

VXLANNetwork