考题 #
kubectl scale deployment nginx --replicas=3
创建busybox：
kubectl run busybox --image=busybox --generator=run-pod/v1 --command=true -- sleep 7d
# nslookup
kubectl run nginx-dns --image=nginx
kubectl run busybox --image=busybox --generator=run-pod/v1 --command=true -- sleep 7d
kubectl exec -it busybox -- nslookup nginx-dns
kubectl exec -it busybox -- nslookup <pod-ip>
etcd备份和还原：
ETCDCTL_API=3 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
ETCDCTL_API=3 etcdctl --endpoints=https://[127.0.0.1]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt \
--name=master \
--cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key \
--data-dir /var/lib/etcd-from-backup \
--initial-cluster=master=https://127.0.0.1:2380 \
--initial-cluster-token etcd-cluster-1 \
--initial-advertise-peer-urls=https://127.0.0.1:2380 \
snapshot restore ...