In various posts, we have already introduced some container networking solutions (see here and here). In this post, we will focus on Contiv, an opensource networking plugin that brings policy based networking across containers.
What is Contiv
Contiv is a Docker certified (yet opensource) networking plugin for Docker Swarm but it also works on Kubernetes. It is primarily driven by Cisco. It delivers policy-based networking across containers running on a variety of infrastructure, such as on-premise or cloud, and different flavors of Linux as host OS. That’s a mouthful but essentially it allows you to setup a network (overlay network, L2, L3) across all your containers while applying policies across them. Contiv supports multiple kinds of policies, such as:
- Isolation policies: container A cannot reach container B, container B can communicate with Container C but not with Container D,…
- Bandwidth policies: container A has a bandwith restriction of 500kbps to container B
The installation process is described in this post. We would like to use Contiv as the container networking solution for our Kubernetes cluster.
As we have already an up and running Kubernetes cluster on Ubuntu 16.04 (see this post), I wanted to test the Contiv-Kubernetes integration.
Let’s go ahead:
wim@k8s-master:~/contiv-1.1.4$ sudo ./install/k8s/install.sh -n 192.168.10.64 [sudo] password for wim: Installing Contiv for Kubernetes secret "aci.key" created Generating local certs for Contiv Proxy Setting installation parameters Applying contiv installation To customize the installation press Ctrl+C and edit ./.contiv.yaml. clusterrolebinding "contiv-netplugin" created clusterrole "contiv-netplugin" created serviceaccount "contiv-netplugin" created clusterrolebinding "contiv-netmaster" created clusterrole "contiv-netmaster" created serviceaccount "contiv-netmaster" created configmap "contiv-config" created daemonset "contiv-netplugin" created replicaset "contiv-netmaster" created daemonset "contiv-etcd" created daemonset "contiv-netplugin" deleted clusterrolebinding "contiv-netplugin" configured clusterrole "contiv-netplugin" configured serviceaccount "contiv-netplugin" configured clusterrolebinding "contiv-netmaster" configured clusterrole "contiv-netmaster" configured serviceaccount "contiv-netmaster" configured configmap "contiv-config" configured daemonset "contiv-netplugin" created replicaset "contiv-netmaster" configured daemonset "contiv-etcd" configured Installation is complete ========================================================= Contiv UI is available at https://192.168.10.64:10000 Please use the first run wizard or configure the setup as follows: Configure forwarding mode (optional, default is routing). netctl global set --fwd-mode routing Configure ACI mode (optional) netctl global set --fabric-mode aci --vlan-range
- Create a default network netctl net create -t default --subnet= default-net For example, netctl net create -t default --subnet=126.96.36.199/24 -g 188.8.131.52 default-net =========================================================
Nothing too difficult so far. The above commands will install the Contiv networking plugin to our Kubernetes environment. If all went well, you should also see the Contiv user interface
The default username and password is admin/admin.
In the next posts, we will get our hands dirty with Contiv. Stay tuned!