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docker swarm快速部署redis分布式集群
之前尝试用swarm部署redis集群时网上看了很多帖子，发现大多数都是单机集群，也就是在一个服务器上启多个redis容器，然后进入其中一个容器执行redis搭建，经过研究，我实现了只需要通过docker-compose.yml文件和一个启动命令就完成redis分布式部署的方式，让其分别部署在不同机器上，并实现集群搭建。
环境准备
四台虚拟机
192.168.2.38（管理节点）
192.168.2.81（工作节点）
192.168.2.100（工作节点）
192.168.2.102（工作节点）
时间同步
每台机器都执行
yum install -y ntp cat <<EOF>>/var/spool/cron/root 00 12 * * * /usr/sbin/ntpdate -u ntp1.aliyun.com && /usr/sbin/hwclock -w EOF##查看计划任务crontab -l##手动执行/usr/sbin/ntpdate -u ntp1.aliyun.com && /usr/sbin/hwclock -w
Docker
安装Docker
curl -sSL https://get.daocloud.io/docker | sh
启动docker
sudo systemctl start docker
搭建Swarm集群
打开防火墙(Swarm需要)
管理节点打开2377
# managerfirewall-cmd --zone=public --add-port=2377/tcp --permanent
所有节点打开以下端口
# 所有nodefirewall-cmd --zone=public --add-port=7946/tcp --permanent firewall-cmd --zone=public --add-port=7946/udp --permanent firewall-cmd --zone=public --add-port=4789/tcp --permanent firewall-cmd --zone=public --add-port=4789/udp --permanent
所有节点重启防火墙
# 所有nodefirewall-cmd --reload systemctl restart docker
图个方便可以直接关闭防火墙
创建Swarm
docker swarm init --advertise-addr your_manager_ip
查看join-token
[root@manager ~]# docker swarm join-token workerTo add a worker to this swarm, run the following command: docker swarm join --token SWMTKN-1-51b7t8whxn8j6mdjt5perjmec9u8qguxq8tern9nill737pra2-ejc5nw5f90oz6xldcbmrl2ztu 192.168.2.61:2377[root@manager ~]#
加入Swarm
docker swarm join --token SWMTKN-1- 51b7t8whxn8j6mdjt5perjmec9u8qguxq8tern9nill737pra2-ejc5nw5f90oz6xldcbmrl2ztu 192.168.2.38:2377#查看节点docker node ls
服务约束
添加label
sudo docker node update --label-add redis1=true 管理节点名称 sudo docker node update --label-add redis2=true 工作节点名称 sudo docker node update --label-add redis3=true 工作节点名称 sudo docker node update --label-add redis4=true 工作节点名称
单机集群
弊端：容器都部署在一个机器上，机器挂了，就全挂了。
创建容器
Tips：这里可以写个脚本启动，因为这种方式不常用，这里就不写那个脚本了
docker create --name redis-node1 --net host -v /data/redis-data/node1:/data redis --cluster-enabled yes --cluster-config-file nodes-node-1.conf --port 6379 docker create --name redis-node2 --net host -v /data/redis-data/node2:/data redis --cluster-enabled yes --cluster-config-file nodes-node-2.conf --port 6380 docker create --name redis-node3 --net host -v /data/redis-data/node3:/data redis --cluster-enabled yes --cluster-config-file nodes-node-3.conf --port 6381 docker create --name redis-node4 --net host -v /data/redis-data/node4:/data redis --cluster-enabled yes --cluster-config-file nodes-node-4.conf --port 6382 docker create --name redis-node5 --net host -v /data/redis-data/node5:/data redis --cluster-enabled yes --cluster-config-file nodes-node-5.conf --port 6383 docker create --name redis-node6 --net host -v /data/redis-data/node6:/data redis --cluster-enabled yes --cluster-config-file nodes-node-6.conf --port 6384
启动容器
docker start redis-node1 redis-node2 redis-node3 redis-node4 redis-node5 redis-node6
进入容器启动集群
# 进入其中一个节点docker exec -it redis-node1 /bin/bash# 创建集群redis-cli --cluster create 192.168.2.38:6379 192.168.2.38:6380 192.168.2.38:6381 192.168.2.38:6382 192.168.2.38:6383 192.168.2.38:6384 --cluster-replicas 1# --cluster-replicas 1 一比一，一主一从
分布式集群
redis集群至少需要3个主节点，所以这里搭建三主三从的集群，由于只有4台机器，所以在脚本中把前三个节点放到一台机器上了。
部署
在swarm集群的Manager节点中创建
mkdir /root/redis-swarm cd /root/redis-swarm vi docker-compose.yml
docker compose.yml
说明：
前6个服务为redis节点，最后一个redis-start是用于创建集群，利用redis-cli客户端搭建集群，该服务搭建完redis集群后会自动停止运行。
redis-start需要等待前6个redis节点的执行完毕才能创建集群，因此需要用到脚本wait-for-it.sh
由于redis-cli --cluster create不支持网络别名，所以另写脚本redis-start.sh
使用这套脚本同样可以单机部署集群，只需要在启动时不使用swarm启动就可以了，然后把docker-compose.yml中的网络模式
driver: overlay给注释掉即可
version: '3.7'services: redis-node1: image: redis hostname: redis-node1 ports: - 6379:6379 networks: - redis-swarm volumes: - "node1:/data" command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-1.conf deploy: mode: replicated replicas: 1 resources: limits: # cpus: '0.001' memory: 5120M reservations: # cpus: '0.001' memory: 512M placement: constraints: - node.role==manager redis-node2: image: redis hostname: redis-node2 ports: - 6380:6379 networks: - redis-swarm volumes: - "node2:/data" command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-2.conf deploy: mode: replicated replicas: 1 resources: limits: # cpus: '0.001' memory: 5120M reservations: # cpus: '0.001' memory: 512M placement: constraints: - node.role==manager redis-node3: image: redis hostname: redis-node3 ports: - 6381:6379 networks: - redis-swarm volumes: - "node3:/data" command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-3.conf deploy: mode: replicated resources: limits: # cpus: '0.001' memory: 5120M reservations: # cpus: '0.001' memory: 512M replicas: 1 placement: constraints: - node.role==manager redis-node4: image: redis hostname: redis-node4 ports: - 6382:6379 networks: - redis-swarm volumes: - "node4:/data" command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-4.conf deploy: mode: replicated replicas: 1 resources: limits: # cpus: '0.001' memory: 5120M reservations: # cpus: '0.001' memory: 512M placement: constraints: - node.labels.redis2==true redis-node5: image: redis hostname: redis-node5 ports: - 6383:6379 networks: - redis-swarm volumes: - "node5:/data" command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-5.conf deploy: mode: replicated replicas: 1 resources: limits: # cpus: '0.001' memory: 5120M reservations: # cpus: '0.001' memory: 512M placement: constraints: - node.labels.redis3==true redis-node6: image: redis hostname: redis-node6 ports: - 6384:6379 networks: - redis-swarm volumes: - "node6:/data" command: redis-server --cluster-enabled yes --cluster-config-file nodes-node-6.conf deploy: mode: replicated replicas: 1 resources: limits: # cpus: '0.001' memory: 5120M reservations: # cpus: '0.001' memory: 512M placement: constraints: - node.labels.redis4==true redis-start: image: redis hostname: redis-start networks: - redis-swarm volumes: - "$PWD/start:/redis-start" depends_on: - redis-node1 - redis-node2 - redis-node3 - redis-node4 - redis-node5 - redis-node6 command: /bin/bash -c "chmod 777 /redis-start/redis-start.sh && chmod 777 /redis-start/wait-for-it.sh && /redis-start/redis-start.sh" deploy: restart_policy: condition: on-failure delay: 5s max_attempts: 5 placement: constraints: - node.role==managernetworks: redis-swarm: driver: overlayvolumes: node1: node2: node3: node4: node5: node6:
wait-for-it.sh
mkdir /root/redis-swarm/startvi wait-for-it.sh vi redis-start.sh
#!/usr/bin/env bash# Use this script to test if a given TCP host/port are availablecmdname=$(basename $0)
echoerr() { if [[ $QUIET -ne 1 ]]; then echo "$@" 1>&2; fi }
usage()
{
cat << USAGE >&2
Usage:
$cmdname host:port [-s] [-t timeout] [-- command args]
-h HOST | --host=HOST Host or IP under test
-p PORT | --port=PORT TCP port under test
Alternatively, you specify the host and port as host:port
-s | --strict Only execute subcommand if the test succeeds
-q | --quiet Don't output any status messages
-t TIMEOUT | --timeout=TIMEOUT
Timeout in seconds, zero for no timeout
-- COMMAND ARGS Execute command with args after the test finishes
USAGE
exit 1
}
wait_for()
{
if [[ $TIMEOUT -gt 0 ]]; then
echoerr "$cmdname: waiting $TIMEOUT seconds for $HOST:$PORT"
else
echoerr "$cmdname: waiting for $HOST:$PORT without a timeout"
fi
start_ts=$(date +%s)
while :
do
(echo > /dev/tcp/$HOST/$PORT) >/dev/null 2>&1
result=$?
if [[ $result -eq 0 ]]; then
end_ts=$(date +%s)
echoerr "$cmdname: $HOST:$PORT is available after $((end_ts - start_ts)) seconds"
break
fi
sleep 1
done
return $result
}
wait_for_wrapper()
{
# In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692
if [[ $QUIET -eq 1 ]]; then
timeout $TIMEOUT $0 --quiet --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
else
timeout $TIMEOUT $0 --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
fi
PID=$!
trap "kill -INT -$PID" INT
wait $PID
RESULT=$?
if [[ $RESULT -ne 0 ]]; then
echoerr "$cmdname: timeout occurred after waiting $TIMEOUT seconds for $HOST:$PORT"
fi
return $RESULT
}# process argumentswhile [[ $# -gt 0 ]]
do
case "$1" in
*:* )
hostport=(${1//:/ })
HOST=${hostport[0]}
PORT=${hostport[1]}
shift 1
;;
--child)
CHILD=1
shift 1
;;
-q | --quiet)
QUIET=1
shift 1
;;
-s | --strict)
STRICT=1
shift 1
;;
-h)
HOST="$2"
if [[ $HOST == "" ]]; then break; fi
shift 2
;;
--host=*)
HOST="${1#*=}"
shift 1
;;
-p)
PORT="$2"
if [[ $PORT == "" ]]; then break; fi
shift 2
;;
--port=*)
PORT="${1#*=}"
shift 1
;;
-t)
TIMEOUT="$2"
if [[ $TIMEOUT == "" ]]; then break; fi
shift 2
;;
--timeout=*)
TIMEOUT="${1#*=}"
shift 1
;;
--)
shift
CLI="$@"
break
;;
--help)
usage
;;
*)
echoerr "Unknown argument: $1"
usage
;;
esac
done
if [[ "$HOST" == "" || "$PORT" == "" ]]; then
echoerr "Error: you need to provide a host and port to test."
usage
fi
TIMEOUT=${TIMEOUT:-15}
STRICT=${STRICT:-0}
CHILD=${CHILD:-0}
QUIET=${QUIET:-0}
if [[ $CHILD -gt 0 ]]; then
wait_for
RESULT=$?
exit $RESULT
else
if [[ $TIMEOUT -gt 0 ]]; then
wait_for_wrapper
RESULT=$?
else
wait_for
RESULT=$?
fi
fi
if [[ $CLI != "" ]]; then
if [[ $RESULT -ne 0 && $STRICT -eq 1 ]]; then
echoerr "$cmdname: strict mode, refusing to execute subprocess"
exit $RESULT
fi
exec $CLI
else
exit $RESULT
firedis-start.sh
getent hosts xxx查看主机中/etc/hosts域名映射的IP
cd /redis-start/
bash wait-for-it.sh redis-node1:6379 --timeout=0
bash wait-for-it.sh redis-node2:6379 --timeout=0
bash wait-for-it.sh redis-node3:6379 --timeout=0
bash wait-for-it.sh redis-node4:6379 --timeout=0
bash wait-for-it.sh redis-node5:6379 --timeout=0
bash wait-for-it.sh redis-node6:6379 --timeout=0
echo 'redis-cluster begin'
echo 'yes' | redis-cli --cluster create --cluster-replicas 1 \
`getent hosts redis-node1 | awk '{ print $1 ":6379" }'` \
`getent hosts redis-node2 | awk '{ print $1 ":6379" }'` \
`getent hosts redis-node3 | awk '{ print $1 ":6379" }'` \
`getent hosts redis-node4 | awk '{ print $1 ":6379" }'` \
`getent hosts redis-node5 | awk '{ print $1 ":6379" }'` \
`getent hosts redis-node6 | awk '{ print $1 ":6379" }'`
echo 'redis-cluster end'启动
目录结构
├── docker-compose.yml └── start ├── redis-start.sh └── wait-for-it.sh
swarm管理节点执行
cd /root/redis-swarm docker stack deploy -c docker-compose.yml redis_cluster
查看redis-start服务日志，如下即为启动成功
redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: waiting for redis-node1:6379 without a timeout redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: redis-node1:6379 is available after 18 seconds redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: waiting for redis-node2:6379 without a timeout redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: redis-node2:6379 is available after 13 seconds redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: waiting for redis-node3:6379 without a timeout redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: redis-node3:6379 is available after 0 seconds redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: waiting for redis-node4:6379 without a timeout redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: redis-node4:6379 is available after 0 seconds redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: waiting for redis-node5:6379 without a timeout redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: redis-node5:6379 is available after 0 seconds redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: waiting for redis-node6:6379 without a timeout redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | wait-for-it.sh: redis-node6:6379 is available after 0 seconds redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | redis-cluster begin redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | >>> Performing hash slots allocation on 12 nodes... redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Master[0] -> Slots 0 - 2730 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Master[1] -> Slots 2731 - 5460 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Master[2] -> Slots 5461 - 8191 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Master[3] -> Slots 8192 - 10922 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Master[4] -> Slots 10923 - 13652 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Master[5] -> Slots 13653 - 16383 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Adding replica 10.0.5.6:6379 to 10.0.5.17:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Adding replica 10.0.5.9:6379 to 10.0.5.16:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Adding replica 10.0.5.8:6379 to 10.0.5.18:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Adding replica 10.0.5.12:6379 to 10.0.5.19:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Adding replica 10.0.5.11:6379 to 10.0.5.3:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Adding replica 10.0.5.5:6379 to 10.0.5.2:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | M: 6ce90be6daabc0c700471d03deb3c6bd88c9f0e1 10.0.5.17:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots:[0-2730] (2731 slots) master redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | M: 6ce90be6daabc0c700471d03deb3c6bd88c9f0e1 10.0.5.16:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots:[2731-5460] (2730 slots) master redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | M: ea9b45ec64c08c17283239f8b8e5405b2d182428 10.0.5.18:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots:[5461-8191] (2731 slots) master redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | M: ea9b45ec64c08c17283239f8b8e5405b2d182428 10.0.5.19:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots:[8192-10922] (2731 slots) master redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | M: 935c177308232de05b5483776478020de51bc578 10.0.5.3:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots:[10923-13652] (2730 slots) master redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | M: 935c177308232de05b5483776478020de51bc578 10.0.5.2:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots:[13653-16383] (2731 slots) master redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | S: 1c99e42bcfb28a9fe72952d4e4cc5cd88aded0f9 10.0.5.5:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | replicates 935c177308232de05b5483776478020de51bc578 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | S: 1c99e42bcfb28a9fe72952d4e4cc5cd88aded0f9 10.0.5.6:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | replicates 6ce90be6daabc0c700471d03deb3c6bd88c9f0e1 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | S: 73cf232f232e83126f058cc01458df11146d8537 10.0.5.9:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | replicates 6ce90be6daabc0c700471d03deb3c6bd88c9f0e1 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | S: 73cf232f232e83126f058cc01458df11146d8537 10.0.5.8:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | replicates ea9b45ec64c08c17283239f8b8e5405b2d182428 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | S: ca3c50899d6deb04e296c542cd485791fb3e8922 10.0.5.12:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | replicates ea9b45ec64c08c17283239f8b8e5405b2d182428 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | S: ca3c50899d6deb04e296c542cd485791fb3e8922 10.0.5.11:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | replicates 935c177308232de05b5483776478020de51bc578 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Can I set the above configuration? (type 'yes' to accept): >>> Nodes configuration updated redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | >>> Assign a different config epoch to each node redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | >>> Sending CLUSTER MEET messages to join the cluster redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | Waiting for the cluster to join redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | . redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | >>> Performing Cluster Check (using node 10.0.5.17:6379) redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | M: 6ce90be6daabc0c700471d03deb3c6bd88c9f0e1 10.0.5.17:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots:[0-5460] (5461 slots) master redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | 1 additional replica(s) redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | S: ca3c50899d6deb04e296c542cd485791fb3e8922 10.0.5.12:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots: (0 slots) slave redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | replicates 935c177308232de05b5483776478020de51bc578 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | M: ea9b45ec64c08c17283239f8b8e5405b2d182428 10.0.5.19:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots:[5461-10922] (5462 slots) master redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | 1 additional replica(s) redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | M: 935c177308232de05b5483776478020de51bc578 10.0.5.3:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots:[10923-16383] (5461 slots) master redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | 1 additional replica(s) redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | S: 1c99e42bcfb28a9fe72952d4e4cc5cd88aded0f9 10.0.5.6:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots: (0 slots) slave redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | replicates 6ce90be6daabc0c700471d03deb3c6bd88c9f0e1 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | S: 73cf232f232e83126f058cc01458df11146d8537 10.0.5.9:6379 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | slots: (0 slots) slave redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | replicates ea9b45ec64c08c17283239f8b8e5405b2d182428 redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | [OK] All nodes agree about slots configuration. redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | >>> Check for open slots... redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | >>> Check slots coverage... redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | [OK] All 16384 slots covered. redis-swarm_redis-start.1.6xawjqf5shfw@hyx-test3 | redis-cluster end
撤销部署
docker stack rm redis_cluster
如果需要重新部署集群，redis集群为了保证数据统一，需要清除数据卷。
# 每个节点都需要执行docker volume prune
测试
进入其中一个节点容器，依次查看集群信息
docker exec -it xxx bash redis-cli -c -h redis-node1 info
测试读写数据
测试其中一个主节点宕机，这里删除了主节点1，节点1对应的从节点是节点4，节点1宕机后节点4成为主节点
docker service rm redis-swarm_redis-node1# 查看root@redis-node2:/data# redis-cli -c -h redis-node1 Could not connect to Redis at redis-node1:6379: Name or service not known not connected> root@redis-node2:/data# redis-cli -c -h redis-node4 redis-node4:6379> info
问题
redis-cli --cluster create redis-node1:6379 ...省略
在容器中使用redis-cli创建集群时，无法使用容器名创建，只能使用容器的ip，因为redis-cli对别名不支持
脚本下载+快速启动
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