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I have installed containerd 1.4.9 on CentOS steam 8 server.

based on this document https://containerd.io/docs/getting-started/. I have created default config file containerd config default > /etc/containerd/config.toml like this.

after restarting containerd, when I run crictl ps Its throwing below error

FATA[0000] listing containers failed: rpc error: code = Unimplemented desc = unknown service runtime.v1alpha2.RuntimeService

How to fix this error? after fix this I want to join this node to Kubernets cluster 1.21.3 using systemd cfgroup.

Thanks SR

Jonas
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sfgroups
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3 Answers3

1

Had the same error today while upgrade kubelet on the worker nodes. Issue was within the default configuration. Note that containerd will run fine without any config. In my case I just wanted to enable systemd_cgroup.

ctr plugin ls showed that cri plugin was in error state with default configuration

Just a blank config with systemd_cgroup fixed issue for me:

cat > /etc/containerd/config.toml <<EOF
[plugins."io.containerd.grpc.v1.cri"]
  systemd_cgroup = true
EOF
systemctl restart containerd
Advialance
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0

Background Context About the error:
From gitlab.cncf.ci/containerd crictl.md docs

"This could be that you are using an incorrect containerd configuration (maybe from a Docker install). You will need to update your containerd configuration to the containerd instance that you are running."

  • I myself had installed docker, then yum installed crictl to investigate command syntax differences and ran into this.
  • The resolution command posted in the linked doc only works if run as root, so here's a more generic version.
# Backup old containerd config (optional)
sudo mv /etc/containerd/config.toml /etc/containerd/config.bak

# Regenerate containerd config
sudo containerd config default | sudo tee /etc/containerd/config.toml

# Restart containerd
sudo systemctl restart containerd

# The above got it to work for me; but with some warnings 
# and ignorable errors that looked this this: 
sudo crictl ps
# WARN[0000] runtime connect using default endpoints: [unix:///var/run/dockershim.sock unix:///run/containerd/containerd.sock unix:///run/crio/crio.sock]. As the default settings are now deprecated, you should set the endpoint instead.
# ERRO[0002] connect endpoint 'unix:///var/run/dockershim.sock', make sure you are running as root and the endpoint has been started: context deadline exceeded
# WARN[0002] image connect using default endpoints: [unix:///var/run/dockershim.sock unix:///run/containerd/containerd.sock unix:///run/crio/crio.sock]. As the default settings are now deprecated, you should set the endpoint instead.
# ERRO[0004] connect endpoint 'unix:///var/run/dockershim.sock', make sure you are running as root and the endpoint has been started: context deadline exceeded
# CONTAINER           IMAGE               CREATED             STATE               NAME                ATTEMPT             POD ID
# ^-- The last line represents correct output, which is why 
# I say ignorable warnings/errors, even the post command 
# exit code seeable using 'echo $?' exit code shows success

# What cleaned up the errors for me was copy pasting the following
echo """
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
""" | sudo tee /etc/crictl.yaml

docker ps
# ^-- no more errors :)

# Note others may need to run one of these instead, based on their
# system's config, keep trying docker ps until one config works
echo """
runtime-endpoint: unix:///var/run/crio/crio.sock
image-endpoint: unix:///var/run/crio/crio.sock
""" | sudo tee /etc/crictl.yaml

echo """
runtime-endpoint: unix:///var/run/dockershim.sock
image-endpoint: unix:///var/run/dockershim.sock
""" | sudo tee /etc/crictl.yaml
neokyle
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0

This problem related to errors in CRI plugins. You can check the status of the CRI plugin

ctr plugin ls

In the past I got the same problem due to devmapper problem, since devmapper is configured as default CRI snapshotter, CRI got error as well.

TYPE                                  ID                       PLATFORMS      STATUS
io.containerd.snapshotter.v1          devmapper                linux/amd64    error
io.containerd.grpc.v1                 cri                      linux/amd64    error

The problem gone after I reconfigure the devmapper snapshotter.

Removing the config (/etc/containerd/config.toml) works as well, but the containerd runs with default configuration, which was not what I wanted.

alfianabdi
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