docker swarm快速部署redis分布式集群的详细过程

目录

• 环境准备
• Docker
• 搭建Swarm集群
• 打开防火墙(Swarm需要)
• 创建Swarm
• 加入Swarm
• 服务约束
• 单机集群
• 创建容器
• 启动容器
• 进入容器启动集群
• 分布式集群
• 部署
• docker compose.yml
• wait-for-it.sh
• redis-start.sh
• 启动
• 目录结构
• 撤销部署
• 测试
• 问题
• 脚本下载+快速启动

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

# manager
firewall-cmd --zone=public --add-port=2377/tcp --permanent

所有节点打开以下端口

# 所有node
firewall-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node
firewall-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 worker
To 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==manager

networks:
  redis-swarm:
    driver: overlay

volumes:
  node1:
  node2:
  node3:
  node4:
  node5:
  node6:

wait-for-it.sh

mkdir /root/redis-swarm/start
vi wait-for-it.sh
vi redis-start.sh

#!/usr/bin/env bash
#   Use this script to test if a given TCP host/port are available

cmdname=$(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 arguments
while [[ $# -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
fi

redis-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

链接: https://pan.baidu.com/s/18_YS9ng29e31Az_HBzBC1w?pwd=sp8w

提取码: sp8w 

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