CentOS7.9下安装docker以及redis集群全过程

环境准备

  1. 虚拟机系统地址: http://mirrors.aliyun.com/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-2009.iso

  2. 安装时选择最小安装

  3. 使用virtual box安装完成后的虚拟机版本

    [root@localhost ~]# cat /etc/centos-release
CentOS Linux release 7.9.2009 (Core)

  4. 设置虚拟机端口转发

    宿主机:虚拟机

    1. 18022:22
    2. 7001:7001
    3. 7002:7002
    4. 7003:7003
    5. 7004:7004
    6. 7005:7005
    7. 7006:7006

    redis集群间会通过对应的ip进行连接，如果端口转发设置了17001:7001,那么 外部连接17001能够连到单机，但是外部客户端获取的集群信息将会是虚拟机中真实的端口(如7002),此时外部的客户端将会通过集群连接7002，但是7002在宿主机中没有做端口映射，导致连接失败

  5. 虚拟机用户

    root用户: root/root

    redis用户: redis/1qaz2wsx

    redis已开启密码验证:1qaz2wsx

本例中常用命令行

docker ps -a #查看所有的容器
docker ps #查看运行中的容器
docker stop container_id #停止指定id的容器,多个以逗号分隔
docker start container_id #开启容器,多个以逗号分隔
docker restart container_id #重启容器,多个以逗号分隔
docker rm container_id #删除容器,多个以逗号分隔
docker exec -it container_id /bin/bash #进入容器，并继续bash命令行交互
#批量停止
docker stop `docker ps | awk 'NR!=1{print $1}'`
#批量启动(只启动redis)
docker restart `docker ps -a | grep redis-  | awk '{print $1}'`

docker exec -it redis-master1 /bin/bash #进入容器
#进入redis-cli控制台
redis-cli -h 127.0.0.1 -p 7001 -a 1qaz2wsx 
# 以下命令在redis控制台中执行
cluster nodes #集群节点信息
cluster info #集群状态

docker安装

  1. 执行命令查询可安装的docker版本

    [root@localhost ~]# yum list docker-ce --showduplicates | sort -r

    此处选择了18.06.3-ce

    [root@localhost ~]# yum install docker-ce-18.06.3-ce

    安装后加入开机启动服务

    [root@localhost ~]# systemctl start docker
[root@localhost ~]# systemctl enable docker

    查看docker信息

    
[root@localhost ~]# docker version
Client:
 Version:           18.06.3-ce
 API version:       1.38
 Go version:        go1.10.3
 Git commit:        d7080c1
 Built:             Wed Feb 20 02:26:51 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server:
 Engine:
  Version:          18.06.3-ce
  API version:      1.38 (minimum version 1.12)
  Go version:       go1.10.3
  Git commit:       d7080c1
  Built:            Wed Feb 20 02:28:17 2019
  OS/Arch:          linux/amd64
  Experimental:     false

docker-compose安装

构建redis集群使用了docker-compose命令。

  1. 下载docker-compose并安装

    [root@localhost ~]# cd /usr/local/bin/
[root@localhost bin]# wget https://github.com/docker/compose/releases/download/v2.3.1/docker-compose-linux-x86_64

    注意此处文件的目录在/usr/local/bin/中

    这里建议直接在外部下载好后ftp上传到虚拟机中

    v2.3.1可以根据需要自己到github上更换版本

    地址: https://github.com/docker/compose/releases/

    重命名下载下来的文件包并赋予权限，完成后查看版本信息

    [root@localhost ~]# cd /usr/local/bin/
[root@localhost bin]# rename docker-compose-linux-x86_64 docker-compose docker-compose-linux-x86_64
[root@localhost bin]# chmod +x /usr/local/bin/docker-compose
[root@localhost bin]# docker-compose --version
Docker Compose version v2.3.1

docker中拉取redis镜像

  1. 在https://hub.docker.com/_/redis?tab=tags上找到自己需要的redis镜像版本

    这里选择了redis:6.2.6版本

  2. 拉取镜像并查看

    [root@localhost ~]# docker pull redis:6.2.6
[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
redis               6.2.6               0e403e3816e8        5 days ago          113MB

  3. 创建docker容器和虚拟机间的映射目录(目录位置可随意)

    本例中由于新建了redis用户，所以/home目录下已经存在/redis目录了

    1. 在/home/redis/redis-config目录下新建6个节点配置目录(redis-config需要自己新建)
    [redis@localhost redis-config]$ mkdir 700{1..6}
[redis@localhost redis-config]$ ls
7001  7002  7003  7004  7005  7006

  4. 为每个节点准备配置文件(每个节点目录各copy一份)

    port 7001 
protected-mode no # 关闭保护模式,容许无密码连接
bind 0.0.0.0 # 绑定0.0.0.0,或者注释此项，容许任意ip连接
daemonize no # 关闭守护进程
appendonly yes # 开启AOF持久化
requirepass 1qaz2wsx # 本机密码-与主节点密码一致,否则无法自动切换主从
masterauth 1qaz2wsx # 主节点密码
cluster-enabled yes # 开启 cluster集群
cluster-config-file 7001.conf #实际文件为node-7001.conf,程序自动会生成
cluster-node-timeout 10000 # 集群超时(ms) 
cluster-announce-port 7001 # 集群节点映射端口号
cluster-announce-bus-port 17001 # 集群节点总线端口号

    配置中port、cluster-config-file、cluster-announce-port、cluster-announce-bus-port四项配置需要在copy过程中根据端口号修改

    更多设置参考redis官网的配置

    最终目录结构如下(此步骤只要关注7001-7006几个文件夹即可)

    [root@localhost redis-config]# ls
7001  7003  7005  cluster.tmpl        redis.conf
7002  7004  7006  docker-compose.yml

  5. 设置防火墙，开启7001-7006的端口，开启后重启防火墙

    [root@localhost redis-config]# firewall-cmd --zone=public --add-port=7001-7006/tcp --permanent
[root@localhost redis-config]# firewall-cmd --reload
[root@localhost redis-config]# firewall-cmd --list-ports
7001-7006/tcp

  6. 在/home/redis/redis-config下创建docker-compose.yml 内容如下:

    注意,该yaml文件中指定了容器以host模式启动,会使用宿主虚拟机的host地址和端口,这样外部设置了端口转发后可以直接访问到容器

    network_mode: host

    version: "3.7"
services:
  redis-master1:
     image: redis:6.2.6 # 基础镜像
     container_name: redis-master1 # 容器服务名
     restart: always # docker重启时容器也重启,由于docker设置开机自启，实际设置后并没有成功启动,解决方案是添加了开机脚本自动执行重启
     environment: # 环境变量
       - PORT=7001 # 跟 config/nodes-7001.conf 里的配置一样的端口
       - TZ=Asia/Shanghai # 时区设置为上海
     network_mode: host # 使用docker宿主IP
     ports: # 映射端口，对外提供服务
       - "7001:7001" # redis 的服务端口
       - "17001:17001" # redis 集群监控端口
     stdin_open: true # 标准输入打开
     tty: true
     privileged: true # 拥有容器内命令执行的权限
     volumes: # 数据卷，目录挂载 host:container的文件映射关系-容器启动后读取的配置的host中的映射路径文件，然后被加载进/data的映射目录中
       - /home/redis/redis-config/7001/nodes-7001.conf:/etc/redis/redis.conf
       - /home/redis/redis-config/7001/data:/data
     command: ["redis-server", "/etc/redis/redis.conf"] # 覆盖容器启动后默认执行的命令
  redis-master2:
     image: redis:6.2.6
     container_name: redis-master2
     restart: always
     environment:
       - PORT=7002
       - TZ=Asia/Shanghai
     network_mode: host
     ports:
       - "7002:7002"
       - "17002:17002"
     stdin_open: true 
     tty: true
     privileged: true 
     volumes: 
       - /home/redis/redis-config/7002/nodes-7002.conf:/etc/redis/redis.conf
       - /home/redis/redis-config/7002/data:/data
     command: ["redis-server", "/etc/redis/redis.conf"]
  redis-master3:
     image: redis:6.2.6
     container_name: redis-master3
     restart: always
     environment:
       - PORT=7003
       - TZ=Asia/Shanghai
     network_mode: host
     ports:
       - "7003:7003"
       - "17003:17003"
     stdin_open: true 
     tty: true
     privileged: true 
     volumes: 
       - /home/redis/redis-config/7003/nodes-7003.conf:/etc/redis/redis.conf
       - /home/redis/redis-config/7003/data:/data
     command: ["redis-server", "/etc/redis/redis.conf"]
  redis-slave1:
     image: redis:6.2.6
     container_name: redis-slave1
     restart: always
     environment:
       - PORT=7004
     network_mode: host
     ports:
       - "7004:7004"
       - "17004:17004"
     stdin_open: true
     tty: true
     privileged: true
     volumes: 
       - /home/redis/redis-config/7004/nodes-7004.conf:/etc/redis/redis.conf
       - /home/redis/redis-config/7004/data:/data
     command: ["redis-server", "/etc/redis/redis.conf"]
  redis-slave2:
     image: redis:6.2.6
     container_name: redis-salve2
     restart: always
     environment:
        - PORT=7005
     network_mode: host
     ports:
       - "7005:7005"
       - "17005:17005"
     stdin_open: true
     tty: true
     privileged: true
     volumes: 
       - /home/redis/redis-config/7005/nodes-7005.conf:/etc/redis/redis.conf
       - /home/redis/redis-config/7005/data:/data
     command: ["redis-server", "/etc/redis/redis.conf"]
  redis-slave3:
     image: redis:6.2.6
     container_name: redis-slave3
     restart: always
     environment:
        - PORT=7006
     network_mode: host
     ports:
       - "7006:7006"
       - "17006:17006"
     stdin_open: true
     tty: true
     privileged: true
     volumes: 
       - /home/redis/redis-config/7006/nodes-7006.conf:/etc/redis/redis.conf
       - /home/redis/redis-config/7006/data:/data
     command: ["redis-server", "/etc/redis/redis.conf"]

    注意volumes配置很重要,该配置是指定虚拟机和docker容器间的文件映射关系

    /home/redis/redis-config/7006/nodes-7006.conf:/etc/redis/redis.conf

    指的是把/home/redis/redis-config/7006/nodes-7006.conf映射给/etc/redis/redis.conf，容器中的redis读取的是默认路径下的配置文件。

    同理，后面的/home/redis/redis-config/7006/data目录是容器执行时存储的持久化文件的目录，该目录在虚拟机宿主中需要提前新建

  7. 在/home/redis/redis-config下启动测试(容器状态出错可以使用docker logs container_name查看log)

    在docker-compose.yml同目录下执行docker-compose up -d将会开始启动容器

    [redis@localhost redis-config]$ sudo docker-compose up -d
[+] Running 6/6
 ⠿ Container redis-slave3   Started                                                        0.3s
 ⠿ Container redis-master1  Running                                                        0.0s
 ⠿ Container redis-master2  Started                                                        0.4s
 ⠿ Container redis-master3  Started                                                        0.4s
 ⠿ Container redis-slave1   Started                                                        0.3s
 ⠿ Container redis-salve2   Started                                                        0.3s
[redis@localhost redis-config]$ sudo docker-compose ps
NAME                COMMAND                  SERVICE             STATUS              PORTS
redis-master1       "docker-entrypoint.s…"   redis-master1       running
redis-master2       "docker-entrypoint.s…"   redis-master2       running
redis-master3       "docker-entrypoint.s…"   redis-master3       running
redis-salve2        "docker-entrypoint.s…"   redis-slave2        running
redis-slave1        "docker-entrypoint.s…"   redis-slave1        running
redis-slave3        "docker-entrypoint.s…"   redis-slave3        running
# 查看运行log
[redis@localhost redis-config]$sudo docker logs refis-master1
1:C 08 Mar 2022 17:40:43.824 # Redis version=6.2.6, bits=64, commit=00000000, modified=0, pid=1, just started
1:C 08 Mar 2022 17:40:43.824 # Configuration loaded
1:M 08 Mar 2022 17:40:43.824 * monotonic clock: POSIX clock_gettime
1:M 08 Mar 2022 17:40:43.825 * No cluster configuration found, I'm 493be565483b3731218b53121f323d27a15e3344
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 6.2.6 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    '      ,       .-`  | `,    )     Running in cluster mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port: 7001
 |    `-._   `._    /     _.-'    |     PID: 1
  `-._    `-._  `-./  _.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |           https://redis.io
  `-._    `-._`-.__.-'_.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |
  `-._    `-._`-.__.-'_.-'    _.-'
      `-._    `-.__.-'    _.-'
          `-._        _.-'
              `-.__.-'

1:M 08 Mar 2022 17:40:43.841 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
1:M 08 Mar 2022 17:40:43.841 # Server initialized
1:M 08 Mar 2022 17:40:43.841 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
1:M 08 Mar 2022 17:40:43.841 * Ready to accept connections
[redis@localhost redis-config]$

  8. 开启集群，任意进入一个容器后查看信息

    docker exec -it redis-master1 /bin/bash命令是进入容器中

    redis-master1可以替换为你自己的容器名(docker ps可以查看运行中的容器信息)

    [root@localhost redis-config]# docker exec -it redis-master1 /bin/bash

#下面是redis容器中的操作了(exit命令退出) 容器中的redis被设定了7001的端口
#所以指定 7001进入
root@localhost:/data# redis-cli -h 127.0.0.1 -p 7001
127.0.0.1:7001> auth 1qaz2wsx
OK
127.0.0.1:7001> info replication
# Replication
role:master
connected_slaves:0
master_failover_state:no-failover
master_replid:9ea784e6649cbf622b095598cdfb5a0b0cf228c5
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0

  9. 此时所有的容器都是master,集群还未创建，先查看容器ip

    [root@localhost redis-config]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
aab2ec44ae45        redis:6.2.6         "docker-entrypoint.s…"   About an hour ago   Up 22 minutes                           redis-master2
b65fb2dbf322        redis:6.2.6         "docker-entrypoint.s…"   About an hour ago   Up 22 minutes                           redis-slave3
9bd201bd00d3        redis:6.2.6         "docker-entrypoint.s…"   About an hour ago   Up 22 minutes                           redis-slave1
130d9710f73c        redis:6.2.6         "docker-entrypoint.s…"   About an hour ago   Up 22 minutes                           redis-master3
707733341de8        redis:6.2.6         "docker-entrypoint.s…"   About an hour ago   Up 22 minutes                           redis-salve2
d0327b5172f6        redis:6.2.6         "docker-entrypoint.s…"   About an hour ago   Up 22 minutes                           redis-master1

    根据容器id查询IP

    [root@localhost redis-config]# docker inspect aab2ec44ae45 b65fb2dbf322 9bd201bd00d3 130d9710f73c 707733341de8 d0327b5172f6 | grep IPA
  "SecondaryIPAddresses": null,
            "IPAddress": "",
                    "IPAMConfig": null,
                    "IPAddress": "",
            "SecondaryIPAddresses": null,

    由于使用host方式连接，所以此处ip可能为空，容器内地址和宿主虚拟机共享，使用了同一网段，可认为是127.0.0.1，同时容器内的redis可以相互访问

  10. 创建集群(--cluster-replicas 1代表一个主节点有一个从节点)

    注意操作是在容器中直接执行而不是进入redis，注意添加-a 密码认证

    在容器中使用redis-cli命令

    root@localhost:/data#  redis-cli --cluster create -a 1qaz2wsx 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006 --cluster-replicas 1
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 127.0.0.1:7005 to 127.0.0.1:7001
Adding replica 127.0.0.1:7006 to 127.0.0.1:7002
Adding replica 127.0.0.1:7004 to 127.0.0.1:7003
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 493be565483b3731218b53121f323d27a15e3344 127.0.0.1:7001
   slots:[0-5460] (5461 slots) master
M: cea65f3d0079aecf8e6e361ae61cc1330f28f241 127.0.0.1:7002
   slots:[5461-10922] (5462 slots) master
M: b6703deba75f2a6cca476a236262f95545e1e55a 127.0.0.1:7003
   slots:[10923-16383] (5461 slots) master
S: 527aec25c7221ab803571854ce7b4fdb67803b21 127.0.0.1:7004
   replicates cea65f3d0079aecf8e6e361ae61cc1330f28f241
S: e5f66a3c8aa3dcad341f989d76eab924049d747c 127.0.0.1:7005
   replicates b6703deba75f2a6cca476a236262f95545e1e55a
S: 91a44195b75ada961be2687426b805342a459631 127.0.0.1:7006
   replicates 493be565483b3731218b53121f323d27a15e3344
Can I set the above configuration? (type 'yes' to accept):yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join
......
>>> Performing Cluster Check (using node 127.0.0.1:7001)
M: 493be565483b3731218b53121f323d27a15e3344 127.0.0.1:7001
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
S: e5f66a3c8aa3dcad341f989d76eab924049d747c 127.0.0.1:7005
   slots: (0 slots) slave
   replicates b6703deba75f2a6cca476a236262f95545e1e55a
M: b6703deba75f2a6cca476a236262f95545e1e55a 127.0.0.1:7003
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
S: 91a44195b75ada961be2687426b805342a459631 127.0.0.1:7006
   slots: (0 slots) slave
   replicates 493be565483b3731218b53121f323d27a15e3344
M: cea65f3d0079aecf8e6e361ae61cc1330f28f241 127.0.0.1:7002
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: 527aec25c7221ab803571854ce7b4fdb67803b21 127.0.0.1:7004
   slots: (0 slots) slave
   replicates cea65f3d0079aecf8e6e361ae61cc1330f28f241
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

    数据会自动分片(Slots)，集群一定是被分完了16383个槽才能正常运行

  11. 测试集群

    redis-cli -c -p 7006 --pass 1qaz2wsx

    使用-c连接集群

    root@localhost:/data# redis-cli -c -p 7006 --pass 1qaz2wsx
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:7006> set tmq lyh
-> Redirected to slot [5896] located at 127.0.0.1:7002
OK
127.0.0.1:7002>

    可以看到从7006从库设值会自动跳转到合适的主库(根据hash分片(Slots)定位到对应的主库)

    关闭一个主节点后,从节点自动升级为主节点

    [root@localhost redis-config]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
2f65f6726eac        redis:6.2.6         "docker-entrypoint.s…"   19 minutes ago      Up 19 minutes                           redis-master3
0320ff7bb8be        redis:6.2.6         "docker-entrypoint.s…"   19 minutes ago      Up 19 minutes                           redis-master1
eb37d5d69286        redis:6.2.6         "docker-entrypoint.s…"   19 minutes ago      Up 19 minutes                           redis-slave3
23c01b207843        redis:6.2.6         "docker-entrypoint.s…"   19 minutes ago      Up 19 minutes                           redis-salve2
d38ce71d6642        redis:6.2.6         "docker-entrypoint.s…"   19 minutes ago      Up 19 minutes                           redis-slave1
88be84a76769        redis:6.2.6         "docker-entrypoint.s…"   19 minutes ago      Up 19 minutes                           redis-master2
[root@localhost redis-config]# docker stop 88be84a76769    #停止7002主节点
88be84a76769
[root@localhost redis-config]# docker exec -it redis-master1 /bin/bash
root@localhost:/data# redis-cli -h 127.0.0.1 -p 7001 -a 1qaz2wsx
127.0.0.1:7001> cluster nodes  #7002节点状态为fail
39baee913bf54b477b76c391cdff029a00df4d82 127.0.0.1:7006@17006 slave c9f242c66084f411150091c991e948c7adeab813 0 1646749528647 1 connected
c9f242c66084f411150091c991e948c7adeab813 127.0.0.1:7001@17001 myself,master - 0 1646749526000 1 connected 0-5460
ab48156e010439f300d182a2c97405f0284d2812 127.0.0.1:7005@17005 slave d30478df0a2e801eb479bad12507829af8bb066c 0 1646749527000 3 connected
b261873db577925008b8aa860effae78c54ddb83 127.0.0.1:7002@17002 master,fail - 1646749487394 1646749484000 2 disconnected
588437eeb993168ac80da825b66a1d128fe9f422 127.0.0.1:7004@17004 master - 0 1646749528000 7 connected 5461-10922
d30478df0a2e801eb479bad12507829af8bb066c 127.0.0.1:7003@17003 master - 0 1646749528000 3 connected 10923-16383
127.0.0.1:7001>
root@localhost:/data# redis-cli -c -p 7005 -a 1qaz2wsx
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:7005> set tws 111   #测试集群数据
-> Redirected to slot [7154] located at 127.0.0.1:7004
OK
127.0.0.1:7004>
root@localhost:/data# redis-cli -c -p 7001 -a 1qaz2wsx
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:7001> get tws
-> Redirected to slot [7154] located at 127.0.0.1:7004
"111"
127.0.0.1:7004>
root@localhost:/data# exit
exit
[root@localhost redis-config]# docker start 88be84a76769  #启动7002后 7002变为从节点
88be84a76769
[root@localhost redis-config]# docker exec -it redis-master1 /bin/bash
root@localhost:/data# redis-cli -c -p 7001 -a 1qaz2wsx
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:7001> cluster nodes
39baee913bf54b477b76c391cdff029a00df4d82 127.0.0.1:7006@17006 slave c9f242c66084f411150091c991e948c7adeab813 0 1646749619151 1 connected
c9f242c66084f411150091c991e948c7adeab813 127.0.0.1:7001@17001 myself,master - 0 1646749618000 1 connected 0-5460
ab48156e010439f300d182a2c97405f0284d2812 127.0.0.1:7005@17005 slave d30478df0a2e801eb479bad12507829af8bb066c 0 1646749618000 3 connected
b261873db577925008b8aa860effae78c54ddb83 127.0.0.1:7002@17002 slave 588437eeb993168ac80da825b66a1d128fe9f422 0 1646749620156 7 connected
588437eeb993168ac80da825b66a1d128fe9f422 127.0.0.1:7004@17004 master - 0 1646749619000 7 connected 5461-10922
d30478df0a2e801eb479bad12507829af8bb066c 127.0.0.1:7003@17003 master - 0 1646749618147 3 connected 10923-16383
127.0.0.1:7001>

    关闭一个master后，一个从节点会提升为主节点，开启关闭的主节点后，原先的主节点变成了从节点。

外部连接

外部客户端直接连接上文设置的转发端口即可。

redis集群在本例中配置了密码:1qaz2wsx

相关问题

删除集群

如果想删除集群，需要先停止所有的容器,然后根据ID删除

[root@localhost redis-config]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
69913c91e2dd        redis:6.2.6         "docker-entrypoint.s…"   18 minutes ago      Up 18 minutes                           redis-master2
a83068b0bb11        redis:6.2.6         "docker-entrypoint.s…"   18 minutes ago      Up 18 minutes                           redis-slave3
10cf7f6d8030        redis:6.2.6         "docker-entrypoint.s…"   18 minutes ago      Up 18 minutes                           redis-salve2
567b7bf3fd22        redis:6.2.6         "docker-entrypoint.s…"   18 minutes ago      Up 18 minutes                           redis-slave1
3f35eb8ca98d        redis:6.2.6         "docker-entrypoint.s…"   18 minutes ago      Up 18 minutes                           redis-master3
c62e2336f18f        redis:6.2.6         "docker-entrypoint.s…"   18 minutes ago      Up 18 minutes                           redis-master1

[root@localhost redis-config]# docker stop 69913c91e2dd a83068b0bb11 10cf7f6d8030 567b7bf3fd22 3f35eb8ca98d c62e2336f18f
69913c91e2dd
a83068b0bb11
10cf7f6d8030
567b7bf3fd22
3f35eb8ca98d
c62e2336f18f
[root@localhost redis-config]# docker rm 69913c91e2dd a83068b0bb11 10cf7f6d8030 567b7bf3fd22 3f35eb8ca98d c62e2336f18f
69913c91e2dd
a83068b0bb11
10cf7f6d8030
567b7bf3fd22
3f35eb8ca98d
c62e2336f18f

再删除所有节点的data文件夹下的数据配置

位于docker-compose.yml中设置的映射地址(/home/redis/redis-config/7004/data:/data)

重建集群

进入/home/redis/redis-config(docker-compose.yml同级)目录后执行启动命令

[root@localhost redis-config]# docker-compose up -d

集群状态错误

如果实际测试过程中发现endpoint serving hash slot is not reachable错误，需要查看集群节点的状态,如果状态为fail或者集群节点不是对应的三主三从,那么集群就没有建好。

进入容器后查看集群信息

127.0.0.1:7005> cluster info
cluster_state:fail
cluster_slots_assigned:0
cluster_slots_ok:0
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:1
cluster_size:0
cluster_current_epoch:0
cluster_my_epoch:0
cluster_stats_messages_sent:0
cluster_stats_messages_received:0
127.0.0.1:7005> cluster node
(error) ERR Unknown subcommand or wrong number of arguments for 'node'. Try CLUSTER HELP.
127.0.0.1:7005> cluster nodes
ab48156e010439f300d182a2c97405f0284d2812 :7005@17005 myself,master - 0 0 0 connected

如果是公网，可以使用下列代码添加集群

127.0.0.1:7001> cluster meet 127.0.0.1 7002
OK
127.0.0.1:7001> cluster meet 127.0.0.1 7003
OK

执行上述代码后，本节点会以master加入，可能会破坏集群，这一点需要注意。

如果不小心添加了不存在的ip和端口，那么执行下面命令进行移除

cluster forget noaddr报错的id

例如:

127.0.0.1:7006> cluster nodes
ab48156e010439f300d182a2c97405f0284d2812 :0@0 slave,noaddr d30478df0a2e801eb479bad12507829af8bb066c 1646751982380 1646751982380 3 disconnected
d30478df0a2e801eb479bad12507829af8bb066c 127.0.0.1:7003@17003 master - 0 1646752420971 3 connected 10923-16383
b261873db577925008b8aa860effae78c54ddb83 127.0.0.1:7002@17002 slave 588437eeb993168ac80da825b66a1d128fe9f422 0 1646752419000 7 connected
c9f242c66084f411150091c991e948c7adeab813 127.0.0.1:7001@17001 master - 0 1646752423001 1 connected 0-5460
588437eeb993168ac80da825b66a1d128fe9f422 127.0.0.1:7004@17004 master - 0 1646752421987 7 connected 5461-10922
39baee913bf54b477b76c391cdff029a00df4d82 127.0.0.1:7006@17006 myself,slave c9f242c66084f411150091c991e948c7adeab813 0 1646752421000 1 connected
127.0.0.1:7006>

上面的节点中ab48156e010439f300d182a2c97405f0284d2812这个节点是个错误节点，进入redis控制台删除(进入任意正常的集群即可)，然后将未进入集群的redis节点加入集群

[root@localhost ~]# docker exec -it redis-master1 /bin/bash

root@localhost:/data# redis-cli -h 127.0.0.1 -p 7001 -a 1qaz2wsx
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:7001> cluster forget ab48156e010439f300d182a2c97405f0284d2812
OK

注意-需要进入所有的节点将其遗忘,否则其他节点还是会保留这个noaddr的节点信息

#以从节点方式添加节点
redis-cli --cluster add-node new_host:new_port existing_host:existing_port --cluster-slave

开机跟随docker启动

docker update container_name/id --restart=always

可以在代码中配置重启参数

docker-compose.yml中其实已经设置了restart: always属性，并且虚拟机重启后容器确实会跟随重启，但是实际发现重启不完全，集群挂了！

注意，如果虚拟机重启后集群cluster down了,可能是redis容器没有正常重启,手动重启即可

所以需要在开机后手动重启所有的容器，让集群正常。

重启代码

docker restart `docker ps -a | grep redis-  | awk '{print $1}'`

建议配置成sh脚本文件,开机自运行

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