常用命令

查看 K8s 支持的所有资源

kubectl api-resources

查看 K8s 支持的所有 api 版本

kubectl api-versions

kubectl explain pod
kubectl explain pod.apiVersion

查看资源排序

kubectl get po --sort-by=.status.startTime

备份 etcd

直接使用容器里的客户端工具进行备份

查看

kubectl -n kube-system exec -it etcd-k8scp -- sh -c \
"ETCDCTL_API=3 \
ETCDCTL_CACERT=/etc/kubernetes/pki/etcd/ca.crt \
ETCDCTL_CERT=/etc/kubernetes/pki/etcd/server.crt \
ETCDCTL_KEY=/etc/kubernetes/pki/etcd/server.key  \
etcdctl --endpoints=https://127.0.0.1:2379 \
member list -w table"

备份

kubectl -n kube-system exec -it etcd-k8scp -- sh -c \
"ETCDCTL_API=3 \
ETCDCTL_CACERT=/etc/kubernetes/pki/etcd/ca.crt \
ETCDCTL_CERT=/etc/kubernetes/pki/etcd/server.crt \
ETCDCTL_KEY=/etc/kubernetes/pki/etcd/server.key \
etcdctl --endpoints=https://127.0.0.1:2379 \
snapshot save /var/lib/etcd/snapshot_$(date "+%F_%T").db"

拷贝etcdctl客户端工具至宿主机，在宿主机备份

拷贝客户端工具

docker ps | grep etcd

docker cp bff304f0b31d:/usr/local/bin/etcdctl /usr/local/bin/

设置 ETCDCTL_API 版本

export ETCDCTL_API=3

查看

etcdctl --endpoints=https://127.0.0.1:2379 \
        --cacert=/etc/kubernetes/pki/etcd/ca.crt \
        --cert=/etc/kubernetes/pki/etcd/server.crt \
        --key=/etc/kubernetes/pki/etcd/server.key \
        member list -w table

备份

etcdctl --endpoints=https://127.0.0.1:2379 \
        --cacert=/etc/kubernetes/pki/etcd/ca.crt \
        --cert=/etc/kubernetes/pki/etcd/server.crt \
        --key=/etc/kubernetes/pki/etcd/server.key \
        snapshot save /var/lib/etcd/snapshot_$(date "+%F_%T").db

删除资源

强制删除 Pod

kubectl delete pod <pod-name> -n <namespace> --grace-period=0 --force