环境准备
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虚拟机系统地址: http://mirrors.aliyun.com/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-2009.iso
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安装时选择最小安装
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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) -
设置虚拟机端口转发
宿主机:虚拟机
- 18022:22
- 7001:7001
- 7002:7002
- 7003:7003
- 7004:7004
- 7005:7005
- 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
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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
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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。
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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
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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
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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 -
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- 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 - 在
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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 -
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 -
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: hostversion: "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 -
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]$sudo docker logs refis-master1 1:C 08 Mar 2022 17:40:43.824 # Redis version=6.2.6, bits=64, commit=00000000, modified=0, pid=1, just started 1:C 08 Mar 2022 17:40:43.824 # Configuration loaded 1:M 08 Mar 2022 17:40:43.824 * monotonic clock: POSIX clock_gettime 1:M 08 Mar 2022 17:40:43.825 * No cluster configuration found, I'm 493be565483b3731218b53121f323d27a15e3344 _._ _.-``__ ''-._ _.-`` `. `_. ''-._ Redis 6.2.6 (00000000/0) 64 bit .-`` .-```. ```\/ _.,_ ''-._ ( ' , .-` | `, ) Running in cluster mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 7001 | `-._ `._ / _.-' | PID: 1 `-._ `-._ `-./ _.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | https://redis.io `-._ `-._`-.__.-'_.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-' `-._ `-.__.-' _.-' `-._ _.-' `-.__.-' 1:M 08 Mar 2022 17:40:43.841 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128. 1:M 08 Mar 2022 17:40:43.841 # Server initialized 1:M 08 Mar 2022 17:40:43.841 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect. 1:M 08 Mar 2022 17:40:43.841 * Ready to accept connections [redis@localhost redis-config]$ -
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 -
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
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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 -
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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