技術文章 » docker swarm快速部署redis分散式叢集

docker swarm快速部署redis分散式叢集

2022-10-25 21:00:56

之前嘗試用swarm部署redis叢集時網上看了很多貼文，發現大多數都是單機叢集，也就是在一個伺服器上啟多個redis容器，然後進入其中一個容器執行redis搭建，經過研究，我實現了只需要通過docker-compose.yml檔案和一個啟動命令就完成redis分散式部署的方式，讓其分別部署在不同機器上，並實現叢集搭建。

環境準備

四臺虛擬機器器

  • 192.168.2.38（管理節點）
  • 192.168.2.81（工作節點）
  • 192.168.2.100（工作節點）
  • 192.168.2.102（工作節點）

時間同步

每臺機器都執行

yum install -y ntp
cat <<EOF>>/var/spool/cron/root
00 12 * * * /usr/sbin/ntpdate -u ntp1.aliyun.com && /usr/sbin/hwclock -w
EOF
##檢視計劃任務
crontab -l
##手動執行
/usr/sbin/ntpdate -u ntp1.aliyun.com && /usr/sbin/hwclock -w

Docker

安裝Docker

curl -sSL https://get.daocloud.io/docker | sh

啟動docker

sudo systemctl start docker

搭建Swarm叢集

開啟防火牆(Swarm需要)

  • 管理節點開啟2377

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

  • 所有節點開啟以下埠

    # 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

  • 所有節點重啟防火牆

    # 所有node
firewall-cmd --reload
systemctl restart docker

  • 圖個方便可以直接關閉防火牆

建立Swarm

docker swarm init --advertise-addr your_manager_ip

檢視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
#檢視節點
docker node ls

服務約束

新增label

sudo docker node update --label-add redis1=true 管理節點名稱
sudo docker node update --label-add redis2=true 工作節點名稱
sudo docker node update --label-add redis3=true 工作節點名稱
sudo docker node update --label-add redis4=true 工作節點名稱

單機叢集

弊端：容器都部署在一個機器上，機器掛了，就全掛了。

建立容器

Tips：這裡可以寫個指令碼啟動，因為這種方式不常用，這裡就不寫那個指令碼了

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

啟動容器

docker start redis-node1 redis-node2 redis-node3 redis-node4 redis-node5 redis-node6

進入容器啟動叢集

# 進入其中一個節點
docker exec -it redis-node1 /bin/bash
# 建立叢集
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 一比一，一主一從

分散式叢集

redis叢集至少需要3個主節點，所以這裡搭建三主三從的叢集，由於只有4臺機器，所以在指令碼中把前三個節點放到一臺機器上了。

部署

在swarm叢集的Manager節點中建立

mkdir /root/redis-swarm
cd /root/redis-swarm
vi docker-compose.yml

docker compose.yml

說明：

  1. 前6個服務為redis節點，最後一個redis-start是用於建立叢集，利用redis-cli使用者端搭建叢集，該服務搭建完redis叢集後會自動停止執行。

  2. redis-start需要等待前6個redis節點的執行完畢才能建立叢集，因此需要用到指令碼wait-for-it.sh

  3. 由於redis-cli --cluster create不支援網路別名，所以另寫指令碼redis-start.sh

使用這套指令碼同樣可以單機部署叢集，只需要在啟動時不使用swarm啟動就可以了，然後把docker-compose.yml中的網路模式driver: overlay給註釋掉即可

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檢視主機中/etc/hosts域名對映的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'

啟動

目錄結構

├── docker-compose.yml
└── start
    ├── redis-start.sh
    └── wait-for-it.sh

swarm管理節點執行

cd /root/redis-swarm
docker stack deploy -c docker-compose.yml redis_cluster

檢視redis-start服務紀錄檔，如下即為啟動成功

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

復原部署

docker stack rm redis_cluster

如果需要重新部署叢集，redis叢集為了保證資料統一，需要清除資料卷。

# 每個節點都需要執行
docker volume prune

測試

進入其中一個節點容器，依次檢視叢集資訊

docker exec -it xxx bash
redis-cli -c -h redis-node1 info

測試讀寫資料

測試其中一個主節點宕機，這裡刪除了主節點1，節點1對應的從節點是節點4，節點1宕機後節點4成為主節點

docker service rm redis-swarm_redis-node1
# 檢視
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

問題

redis-cli --cluster create redis-node1:6379 ...省略

在容器中使用redis-cli建立叢集時，無法使用容器名建立，只能使用容器的ip，因為redis-cli對別名不支援

指令碼下載+快速啟動

連結：https://pan.baidu.com/s/11ITDFls2UXgjZhdWmhVMFA
提取碼：mvfj