Errors with containerd runtime

[andrey-gava]

Hello!

Client Version: version.Info{Major:"1", Minor:"20", GitVersion:"v1.20.0", GitCommit:"af46c47ce925f4c4ad5cc8d1fca46c7b77d13b38", GitTreeState:"clean", BuildDate:"2020-12-08T17:59:43Z", GoVersion:"go1.15.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"20", GitVersion:"v1.20.0", GitCommit:"af46c47ce925f4c4ad5cc8d1fca46c7b77d13b38", GitTreeState:"clean", BuildDate:"2020-12-08T17:51:19Z", GoVersion:"go1.15.5", Compiler:"gc", Platform:"linux/amd64"}

Container runtime - containerd
Kubectl-debug version v0.2.0-rc and v0.1.1

I get this kind of errors in agentless=true and with daemonset agents deployed:

kubectl-debug --agentless -n dev oauth-dev-5c885dfd7f-98j2n
Agent Pod info: [Name:debug-agent-pod-46aa6a04-655a-11eb-a63d-00505696f1d5, Namespace:default, Image:aylei/debug-agent:latest, HostPort:10027, ContainerPort:10027]
Waiting for pod debug-agent-pod-46aa6a04-655a-11eb-a63d-00505696f1d5 to run...
Start deleting agent pod oauth-dev-5c885dfd7f-98j2n 
error execute remote, unable to upgrade connection: Failed to construct RuntimeManager.  Error- failed to dial "/run/containerd/containerd.sock"- context deadline exceeded
error: unable to upgrade connection: Failed to construct RuntimeManager.  Error- failed to dial "/run/containerd/containerd.sock"- context deadline exceeded

kubectl-debug --agentless --port-forward nginx-deployment-668f8b749b-b695l
Agent Pod info: [Name:debug-agent-pod-b8591a5a-655a-11eb-ab03-5254004d77d3, Namespace:default, Image:aylei/debug-agent:latest, HostPort:10027, ContainerPort:10027]
Waiting for pod debug-agent-pod-b8591a5a-655a-11eb-ab03-5254004d77d3 to run...
Forwarding from 127.0.0.1:10027 -> 10027
Forwarding from [::1]:10027 -> 10027
Handling connection for 10027
                             Start deleting agent pod nginx-deployment-668f8b749b-b695l 
error execute remote, Internal error occurred: error attaching to container: failed to mount /tmp/containerd-mount374763324: no such file or directory
error: Internal error occurred: error attaching to container: failed to mount /tmp/containerd-mount374763324: no such file or directory

[lic17]

mount hostPath /var/lib/containerd to the agent pod can fix the err.

[JamesTGrant]

If you're using agentless (which is good!) then you'll need to rebuild (follow the build from source instructions in the README.md) the project with the following changes in pkg/plugin/cmd.go

Add varlibcontainerd to Volumes: []corev1.Volume section like this:

			{
				Name: "varlibcontainerd",
				VolumeSource: corev1.VolumeSource{
					HostPath: &corev1.HostPathVolumeSource{
						Path: "/var/lib/containerd",
					},
				},
			},	

Add varlibcontainerd to VolumeMounts section like this:

					{
						Name:      "vardata",
						MountPath: "/var/data",
					},
					{
						Name:      "varlibcontainerd",
						MountPath: "/var/lib/containerd",
					},