4.2. Creating a ContainerRuntimeConfig CR to edit CRI-O parameters

Procedure

1. Create a YAML file for the ContainerRuntimeConfig CR:

   apiVersion: machineconfiguration.openshift.io/v1
   kind: ContainerRuntimeConfig
   metadata:
    name: overlay-size
   spec:
    machineConfigPoolSelector:
      matchLabels:
        pools.operator.machineconfiguration.openshift.io/worker: ''
    containerRuntimeConfig:
      logLevel: debug
      overlaySize: 8G
      defaultRuntime: "runc"

   where:

   spec.machineConfigPoolSelector.matchLabels

   Set a label for the machine config pool that you want you want to modify.

   spec.containerRuntimeConfig

   Set the parameters as needed.

2. Create the ContainerRuntimeConfig CR:

   $ oc create -f <file_name>.yaml

3. Verify that the CR is created:

   $ oc get ContainerRuntimeConfig

   Example output

   NAME           AGE
   overlay-size   3m19s

4. Check that a new containerruntime machine config is created:

   $ oc get machineconfigs | grep containerrun

   Example output

   99-worker-generated-containerruntime   2c9371fbb673b97a6fe8b1c52691999ed3a1bfc2  3.5.0  31s

5. Monitor the machine config pool until all are shown as ready:

   $ oc get mcp worker

   Example output

   NAME    CONFIG               UPDATED  UPDATING  DEGRADED  MACHINECOUNT  READYMACHINECOUNT  UPDATEDMACHINECOUNT  DEGRADEDMACHINECOUNT  AGE
   worker  rendered-worker-169  False    True      False     3             1                  1                    0                     9h

6. Verify that the settings were applied in CRI-O:

   1. Open an oc debug session to a node in the machine config pool and run chroot /host.

      $ oc debug node/<node_name>

      sh-4.4# chroot /host

   2. Verify the changes in the crio.conf file:

      sh-4.4# crio config | grep 'log_level'

      Example output

      log_level = "debug"

   3. Verify the changes in the storage.conf file:

      sh-4.4# head -n 7 /etc/containers/storage.conf

      Example output

      [storage]
        driver = "overlay"
        runroot = "/var/run/containers/storage"
        graphroot = "/var/lib/containers/storage"
        [storage.options]
          additionalimagestores = []
          size = "8G"

   4. Verify the changes in the crio/crio.conf.d/01-ctrcfg-defaultRuntime file:

      sh-5.1# cat /etc/crio/crio.conf.d/01-ctrcfg-defaultRuntime

      Example output

      [crio]
        [crio.runtime]
          default_runtime = "runc"