Containerd is an alternative CRI (Container Runtime Interface) to Docker. Please note that containerd must be specified in yaml spec, and that docker must not be present if containerd is.
As CentOS, RHEL and Oracle Linux 8.x do not support Docker, the Containerd CRI is required.
spec: containerd: version: 1.4.4 preserveConfig: false tomlConfig: | [debug] "level" = "info"
|version||The version of containerd to be installed|
|tomlConfig||Containerd config settings that will be merged into /etc/containerd/config.toml|
|preserveConfig||This flag will ensure that nothing is changed in the existing containerd config on the system, regardless of other options.|