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There are a wide variety of different CNI network configurations. This directory just contains some example configurations that can be used as the basis for your own configurations (distributions should package these files in example directories).

Configuration Directory

By default, your CNI configurations are read from /etc/cni/net.d. This can be overwritten by specifying crio.network.network_dir in your override of /etc/crio/crio.conf.d.

CRI-O chooses a CNI configuration from this directory with lexicographic precidence (10-config will be chosen over 99-config). However, CRI-O will only choose a network whose name matches the value of crio.network.cni_default_network (default value is crio).

Unless you have a specific networking configuration you'd like to use, we recommend installing either 10-crio-bridge.conf, or 11-crio-ipv4-bridge.conf. Installing in this case means: Copy the respective files to the configuration directory like so:

sudo cp 10-crio-bridge.conf /etc/cni/net.d

By default, we install the dual stack version: 10-crio-bridge.conf

However, if you are installing on a node with ipv6 disabled (sysctl net.ipv6.conf.default.disable_ipv6 and sysctl net.ipv6.conf.all.disable_ipv6 == 0) then we recommend you install the ipv4 only version: 11-crio-ipv4-bridge.conf Otherwise, you'll run into an error similar to:

Interface vetha38a080a Mac doesn't match: ee:7b:4d:57:3a:d9 not found

Our packaging solutions assume ipv6 is available.

Plugin Directory

In addition, you need to install the CNI plugins necessary into /opt/cni/bin (or the directories specified by crio.network.plugin_dir). The two plugins necessary for the example CNI configurations are loopback and bridge. Below is a tutorial on downloading and setting up the CNI plugins.

CNI Plugin Installation From Source

This tutorial will use the latest version of CNI plugins and build it from source.

Download the CNI plugins source tree:

git clone https://github.com/containernetworking/plugins
cd plugins
git checkout v1.1.1

Build the CNI plugins:

./build_linux.sh # or build_windows.sh


Building plugins

Install the CNI plugins:

sudo mkdir -p /opt/cni/bin
sudo cp bin/* /opt/cni/bin/