kubelet docker read-only file system error

错误情况，报calico错误

remote_runtime.go:351] ExecSync
'/bin/calico-node -bird-ready -felix-ready' from runtime service failed: rpc error: code = Unknown desc = unable to upgrade to tcp, received 404
# kubectl describe po calico-node-b4n6j -n kube-system
Last State:
Terminated
Reason:
ContainerCannotRun
Message:
error while creating mount source path '/opt/cni/bin': mkdir /opt/cni: read-only file system
Exit Code:
128

read-only file system? 我可是在docker环境下呀…继续排查
发现是docker snap的原因： 即系统中通过snap安装了一个docker

# 查看 snap 安装的应用
# sudo snap list
Name
Version
Rev
Tracking
Publisher
Notes
core
16-2.51.4
11606
latest/stable
canonical✓
core
core18
20210722
2128
latest/stable
canonical✓
base
docker
19.03.13
796
latest/stable
canonical✓
-

确实是…那么删除掉重启就大功告成了

# sudo snap remove docker
docker removed
# reboot

最后

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