容器化—Etcd集群

环境

3台机器验证集群的可用性。集群信息如下：
机器名 IP地址 角色
node1 10.0.102.214 etcd节点
node2 10.0.102.175 etcd节点
node3 10.0.102.191 etcd节点

步骤

设置环境变量（三个节点都要运行）

REGISTRY=k8s.gcr.io/etcd
ETCD_VERSION=3.2.24
TOKEN=my-etcd-token
NAME_1=k8s-node-1
NAME_2=k8s-node-2
NAME_3=k8s-node-3
HOST_1=10.0.102.218
HOST_2=10.0.102.151
HOST_3=10.0.102.162
CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_3}=http://${HOST_3}:2380
DATA_DIR=/var/lib/etcd

在node1运行

THIS_NAME=${NAME_1}
THIS_IP=${HOST_1}
docker run -d \
   -p 2379:2379 \
   -p 2380:2380 \
   --volume=${DATA_DIR}:/etcd-data \
   --name etcd ${REGISTRY}:${ETCD_VERSION} \
   /usr/local/bin/etcd \
   --data-dir=/etcd-data --name ${THIS_NAME} \
   --initial-advertise-peer-urls http://${THIS_IP}:2380 \
   --listen-peer-urls http://0.0.0.0:2380 \
   --advertise-client-urls http://${THIS_IP}:2379 \
   --listen-client-urls http://0.0.0.0:2379 \
   --initial-cluster ${CLUSTER} \
   --initial-cluster-state new --initial-cluster-token ${TOKEN}

在 node2 运行

THIS_NAME=${NAME_2}
THIS_IP=${HOST_2}
docker run -d \
   -p 2379:2379 \
   -p 2380:2380 \
   --volume=${DATA_DIR}:/etcd-data \
   --name etcd ${REGISTRY}:${ETCD_VERSION} \
   /usr/local/bin/etcd \
   --data-dir=/etcd-data --name ${THIS_NAME} \
   --initial-advertise-peer-urls http://${THIS_IP}:2380 \
   --listen-peer-urls http://0.0.0.0:2380 \
   --advertise-client-urls http://${THIS_IP}:2379 \
   --listen-client-urls http://0.0.0.0:2379 \
   --initial-cluster ${CLUSTER} \
   --initial-cluster-state existing --initial-cluster-token ${TOKEN}

在 node3 运行：

THIS_NAME=${NAME_3}
THIS_IP=${HOST_3}
docker run -d \
   -p 2379:2379 \
   -p 2380:2380 \
   --volume=${DATA_DIR}:/etcd-data \
   --name etcd ${REGISTRY}:${ETCD_VERSION} \
   /usr/local/bin/etcd \
   --data-dir=/etcd-data \
   --name ${THIS_NAME} \
   --initial-advertise-peer-urls http://${THIS_IP}:2380 \
   --listen-peer-urls http://0.0.0.0:2380 \
   --advertise-client-urls http://${THIS_IP}:2379 \
   --listen-client-urls http://0.0.0.0:2379 \
   --initial-cluster ${CLUSTER} \
   --initial-cluster-state existing --initial-cluster-token ${TOKEN}

验证集群

在测试验证节点NFS上，运行另一个etcd容器，
以便使用其中的etcdctl命令行程序进行验证
REGISTRY=k8s.gcr.io/etcd
ETCD_VERSION=3.2.24
docker run -d \
   --name etcd-client ${REGISTRY}:${ETCD_VERSION} \
   /usr/local/bin/etcd


进入容器，查询集群状态
验证存入数据、读取数据
docker exec etcd-client /bin/sh -c "export ETCDCTL_API=3 && /usr/local/bin/etcdctl --endpoints=http://10.0.102.214:2379,http://10.0.102.175:2379,http://10.0.102.191:2379 --write-out=table member list"

docker exec etcd-client /bin/sh -c "export ETCDCTL_API=3 && /usr/local/bin/etcdctl --endpoints=http://10.0.102.214:2379,http://10.0.102.175:2379,http://10.0.102.191:2379 --write-out=table endpoint status"

docker exec etcd-client /bin/sh -c "export ETCDCTL_API=3 && /usr/local/bin/etcdctl --endpoints=http://10.0.102.214:2379,http://10.0.102.175:2379,http://10.0.102.191:2379 --write-out=table endpoint health"

docker exec etcd-client /bin/sh -c "export ETCDCTL_API=3 && /usr/local/bin/etcdctl --endpoints=http://10.0.102.214:2379,http://10.0.102.175:2379,http://10.0.102.191:2379  put url http://www.sina.com.cn"

docker exec etcd-client /bin/sh -c "export ETCDCTL_API=3 && /usr/local/bin/etcdctl --endpoints=http://10.0.102.214:2379,http://10.0.102.175:2379,http://10.0.102.191:2379  get url"

或者

docker exec -it 5dd66ba70de2 /bin/bash
/#etcdctl --endpoints=http://10.0.102.218:2379 member list

etcdctl cluster-health