Kubernetes(k8s)临时容器EphemeralContainer

临时容器的作用：

当由于容器崩溃或容器镜像不包含调试工具而导致 kubectl exec 无用时， 临时容器对于交互式故障排查很有用。

开启临时容器

vi /usr/lib/systemd/system/kube-apiserver.service
--feature-gates=EphemeralContainers=true

vi /usr/lib/systemd/system/kube-controller-manager.service
--feature-gates=EphemeralContainers=true

vi /usr/lib/systemd/system/kube-scheduler.service
--feature-gates=EphemeralContainers=true
vi /usr/lib/systemd/system/kube-proxy.service
--feature-gates=EphemeralContainers=true

vi /etc/kubernetes/kubelet-conf.yml
featureGates:
  EphemeralContainers: true

重启所有服务

临时容器的使用

K8s 1.16+

https://kubernetes.io/docs/concepts/workloads/pods/ephemeral-containers/

K8s 1.18+

kubectl alpha debug redis-new-5b577b46c7-2jv4j -ti --image=registry.cn-beijing.aliyuncs.com/dotbalo/debug-tools

K8s 1.20+

kubectl debug redis-new-5b577b46c7-2jv4j -ti --image=registry.cn-beijing.aliyuncs.com/dotbalo/debug-tools
kubectl debug node/k8s-node01 -it --image=registry.cn-beijing.aliyuncs.com/dotbalo/debug-tools