fix: Configure containerd runc plugin options with systemd cgroup driver (#493)

* fix: Configure containerd runc plugin to use systemd cgroup driver

konvoy-image-builder installs kubelet as a systemd service, and
kubelet therefore uses the systemd cgroup driver.

The container runtime must use the same cgroup driver.

> Note: In v1.22, if the user is not setting the cgroupDriver field
> under KubeletConfiguration, kubeadm will default it to systemd.
> -- https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/configure-cgroup-driver/

* Use runtime type 'io.containerd.runc.v2'

The 'io.containerd.runc.v1' runtime type was deprecated in containerd
1.4, and does not support the systemd cgroup driver.

* Use systemd cgroup driver with the nvidia runtime

The option should work, because the nvidia runtime is just a repackaged
runc runtime.

* Use SystemdCgroup instead of systemd_cgroup

Using snake case has no effect. Confirmed independently by both @faiq
and @dlipovetsky.

* Use "io.containerd.runc.v2" for nvidia container runtime

Only "io.containerd.runc.v2" supports the SystemdCgroup option we need.

I have seen multiple examples of this configuration in the wild, and
since nvidia-container-runtime is a wrapper around runc, there should
be no issues with using v2 of the containerd wrapper to runc.

* fix: from poor merge

* fix: allows cgroups v2 by default for flatcar

Co-authored-by: Faiq <faiq@users.noreply.github.com>
Co-authored-by: faiq <faiqrazarizvi@gmail.com>

Author: dlipovetsky

ansible/roles/config/templates/config.toml.tmpl

@@ -64,7 +64,6 @@ imports = ["/etc/containerd/conf.d/*.toml"]
     enable_selinux = false
     sandbox_image = "{{ pause_image }}"
     stats_collect_period = 10
-    systemd_cgroup = false
     enable_tls_streaming = false
     max_container_log_line_size = 16384
     disable_cgroup = false
@@ -88,10 +87,12 @@ imports = ["/etc/containerd/conf.d/*.toml"]
         privileged_without_host_devices = false
       [plugins."io.containerd.grpc.v1.cri".containerd.runtimes]
         [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
-          runtime_type = "io.containerd.runc.v1"
+          runtime_type = "io.containerd.runc.v2"
           runtime_engine = ""
           runtime_root = ""
           privileged_without_host_devices = false
+          [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
+            SystemdCgroup = true
     [plugins."io.containerd.grpc.v1.cri".cni]
       bin_dir = "/opt/cni/bin"
       conf_dir = "/etc/cni/net.d"

ansible/roles/containerd/tasks/install-flatcar.yaml

@@ -28,16 +28,3 @@
   copy:
     content: "export PATH=$PATH:/run/torcx/unpack/docker/bin/"
     dest: "/etc/profile.d/my_path.sh"
-
-- name: ensure cgroups v2 are disabled
-  command: grep -q systemd.unified_cgroup_hierarchy=0 /usr/share/oem/grub.cfg
-  changed_when: no
-  failed_when: false
-  register: cgroupsv2_check
-
-- name: cgroups setup
-  when:
-    - cgroupsv2_check.rc != 0
-  block:
-    - name: disable cgroups v2
-      command: sed -E -i 's/^(set linux_append=.*)"$/\1 systemd.unified_cgroup_hierarchy=0 systemd.legacy_systemd_cgroup_controller"/g' /usr/share/oem/grub.cfg