Docker快速搭建Redis集群的方法示例

什么是Redis集群

Redis集群是Redis提供的分布式数据库方案，集群通过分片（sharding）来进行数据共享，并提供复制和故障转移功能。

节点

一个Redis集群通常由多个节点（node）组成，在刚开始的时候，每个节点都是相互独立的，它们都处于一个只包含自己的集群当中，要组建一个真正可工作的集群，我们必须将各个独立的节点连接起来，构成一个包含多个节点的集群。

集群配置

配置文件

下载配置文件：https://raw.githubusercontent.com/antirez/redis/5.0/redis.conf

调整 CLUSTER 节点配置

# 开启cluster集群cluster-enabled yes# 集群配置文件cluster-config-file nodes-6379.conf# 集群节点超时cluster-node-timeout 15000

Docker快速搭建Redis集群

安装Redis

参考文章：https://www.jb51.net/article/150054.htm

准备工作

├── conf│ ├── redis.conf│ └── sentinel.conf├── redis│ ├── data_6379│ ├── data_6380│ ├── data_6381│ ├── data_6382│ ├── data_6383│ └── data_6384└── scripts ├── cluster.sh ├── run.sh └── sentinel.sh

run.sh 脚本文件

#!/usr/bin/env bashset -e# 脚本当前目录cPath=$(cd $(dirname '$0') || exit; pwd)# 根目录dirPath=$(dirname '$cPath')# 获取端口port='$1'if [[ ! '$port' ]]; then port=6379fi# 创建数据目录mkdir -p '$dirPath'/redis/data_'$port'# 删除已启动服务containerId=$(docker ps -a | grep 'redis_$port' | awk -F’ ’ ’{print $1}’)if [[ '$containerId' ]]; then docker rm -f ${containerId} > /dev/nullfi# 启动服务containerName=redis_'$port'docker run -itd --privileged=true -p '$port':6379 --name ${containerName} -v='$dirPath'/conf/redis.conf:/etc/redis/redis.conf -v='$dirPath'/redis/data_'$port':/data redis redis-server /etc/redis/redis.conf > /dev/null# 获取容器IP地址dockerIp=$(docker inspect -f '{{.NetworkSettings.IPAddress}}' '$containerName')# 获取容器启动状态isRunning=$(docker inspect -f '{{.State.Running}}' '$containerName')if [[ '$isRunning' == 'true' ]]; then echo '容器：$containerName - IP：$dockerIp - 启动成功'fi

cluster.sh 脚本文件

#!/usr/bin/env bashset -e# 脚本当前目录cPath=$(cd $(dirname '$0') || exit; pwd)# 启动集群数量num='$1'if [[ ! '$num' ]]; then num=6fisPort=6378for((i=1;i<=$num;i++)); do sh ${cPath}/run.sh $(($sPort+$i))done

启动服务

执行脚本文件，默认创建6个节点

sh scripts/cluster.sh

脚本返回结果

容器：redis_6379 - IP：172.17.0.2 - 启动成功容器：redis_6380 - IP：172.17.0.3 - 启动成功容器：redis_6381 - IP：172.17.0.4 - 启动成功容器：redis_6382 - IP：172.17.0.5 - 启动成功容器：redis_6383 - IP：172.17.0.6 - 启动成功容器：redis_6384 - IP：172.17.0.7 - 启动成功

执行 docker ps 确实是否启动成功

root@DESKTOP-Q13EI52:~/docker-config/redis# docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESc0601df1a456 redis 'docker-entrypoint.s…' 27 seconds ago Up 26 seconds 0.0.0.0:6384->6379/tcp redis_63846fecf70465b8 redis 'docker-entrypoint.s…' 27 seconds ago Up 26 seconds 0.0.0.0:6383->6379/tcp redis_63831af15e90b7a0 redis 'docker-entrypoint.s…' 28 seconds ago Up 27 seconds 0.0.0.0:6382->6379/tcp redis_63826c495f31a5df redis 'docker-entrypoint.s…' 28 seconds ago Up 28 seconds 0.0.0.0:6381->6379/tcp redis_6381e54fd9fd0550 redis 'docker-entrypoint.s…' 29 seconds ago Up 28 seconds 0.0.0.0:6380->6379/tcp redis_6380be92ad2f7046 redis 'docker-entrypoint.s…' 29 seconds ago Up 29 seconds 0.0.0.0:6379->6379/tcp redis_6379

到此为止，6个独立集群节点创建完毕，目前还无法正常工作。

创建集群

此处可以跳过，本人是为了省事

获取容器为redis_开始所有的容器IP地址

docker inspect -f '{{.NetworkSettings.IPAddress}}:6379' `docker ps | grep redis_ | awk -F’ ’ ’{print $1}’` | sort |xargs | sed ’s/ /, /g’# 返回结果# 172.17.0.2:6379, 172.17.0.3:6379, 172.17.0.4:6379, 172.17.0.5:6379, 172.17.0.6:6379, 172.17.0.7:6379

初次创建集群执行

./redis-cli --cluster create 172.17.0.2:6379, 172.17.0.3:6379, 172.17.0.4:6379, 172.17.0.5:6379, 172.17.0.6:6379, 172.17.0.7:6379 --cluster-replicas 1

输出结果

licas 1>>> Performing hash slots allocation on 6 nodes...Master[0] -> Slots 0 - 5460Master[1] -> Slots 5461 - 10922Master[2] -> Slots 10923 - 16383Adding replica 172.17.0.6:6379 to 172.17.0.2:6379Adding replica 172.17.0.7:6379 to 172.17.0.3:6379Adding replica 172.17.0.5:6379 to 172.17.0.4:6379M: e8da1fef656984de3ec2a677edc8d9c48d01cd95 172.17.0.2:6379 slots:[0-5460] (5461 slots) masterM: 68b925ab0fbbc1a632c1754587fb6dad3fa14c91 172.17.0.3:6379 slots:[5461-10922] (5462 slots) masterM: 0a46ab2f6d176738b55fe699c2df1c34f8200d06 172.17.0.4:6379 slots:[10923-16383] (5461 slots) masterS: bd3064ad5297dfc258e9236943455c589be8b2a3 172.17.0.5:6379 replicates 0a46ab2f6d176738b55fe699c2df1c34f8200d06S: f1d8c897882d29e6538b1158525493b3b782289a 172.17.0.6:6379 replicates e8da1fef656984de3ec2a677edc8d9c48d01cd95S: 619e1cb52f39e07b321719b77fc3631fa6293cef 172.17.0.7:6379 replicates 68b925ab0fbbc1a632c1754587fb6dad3fa14c91Can I set the above configuration? (type ’yes’ to accept):

输入：yes，将平均分配槽位

>>> Nodes configuration updated>>> Assign a different config epoch to each node>>> Sending CLUSTER MEET messages to join the clusterWaiting for the cluster to join.....>>> Performing Cluster Check (using node 172.17.0.2:6379)M: e8da1fef656984de3ec2a677edc8d9c48d01cd95 172.17.0.2:6379 slots:[0-5460] (5461 slots) master 1 additional replica(s)S: f1d8c897882d29e6538b1158525493b3b782289a 172.17.0.6:6379 slots: (0 slots) slave replicates e8da1fef656984de3ec2a677edc8d9c48d01cd95S: bd3064ad5297dfc258e9236943455c589be8b2a3 172.17.0.5:6379 slots: (0 slots) slave replicates 0a46ab2f6d176738b55fe699c2df1c34f8200d06M: 0a46ab2f6d176738b55fe699c2df1c34f8200d06 172.17.0.4:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s)S: 619e1cb52f39e07b321719b77fc3631fa6293cef 172.17.0.7:6379 slots: (0 slots) slave replicates 68b925ab0fbbc1a632c1754587fb6dad3fa14c91M: 68b925ab0fbbc1a632c1754587fb6dad3fa14c91 172.17.0.3:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s)[OK] All nodes agree about slots configuration.>>> Check for open slots...>>> Check slots coverage...[OK] All 16384 slots covered.

连接集群

通过客户端连接

redis-cli -c <端口>

执行命令：cluster info

127.0.0.1:6379> cluster infocluster_state:okcluster_slots_assigned:16384cluster_slots_ok:16384cluster_slots_pfail:0cluster_slots_fail:0cluster_known_nodes:6cluster_size:3cluster_current_epoch:6cluster_my_epoch:1cluster_stats_messages_ping_sent:104cluster_stats_messages_pong_sent:120cluster_stats_messages_sent:224cluster_stats_messages_ping_received:115cluster_stats_messages_pong_received:104cluster_stats_messages_meet_received:5cluster_stats_messages_received:224

看到：cluster_state:ok 说明集群已可以正常工作

客户端控制台：cluster help

127.0.0.1:6379> cluster help 1) CLUSTER <subcommand> arg arg ... arg. Subcommands are: 2) ADDSLOTS <slot> [slot ...] -- Assign slots to current node. 3) BUMPEPOCH -- Advance the cluster config epoch. 4) COUNT-failure-reports <node-id> -- Return number of failure reports for <node-id>. 5) COUNTKEYSINSLOT <slot> - Return the number of keys in <slot>. 6) DELSLOTS <slot> [slot ...] -- Delete slots information from current node. 7) FAILOVER [force|takeover] -- Promote current replica node to being a master. 8) FORGET <node-id> -- Remove a node from the cluster. 9) GETKEYSINSLOT <slot> <count> -- Return key names stored by current node in a slot.10) FLUSHSLOTS -- Delete current node own slots information.11) INFO - Return information about the cluster.12) KEYSLOT <key> -- Return the hash slot for <key>.13) MEET <ip> <port> [bus-port] -- Connect nodes into a working cluster.14) MYID -- Return the node id.15) NODES -- Return cluster configuration seen by node. Output format:16) <id> <ip:port> <flags> <master> <pings> <pongs> <epoch> <link> <slot> ... <slot>17) REPLICATE <node-id> -- Configure current node as replica to <node-id>.18) RESET [hard|soft] -- Reset current node (default: soft).19) SET-config-epoch <epoch> - Set config epoch of current node.20) SETSLOT <slot> (importing|migrating|stable|node <node-id>) -- Set slot state.21) REPLICAS <node-id> -- Return <node-id> replicas.22) SAVECONFIG - Force saving cluster configuration on disk.23) SLOTS -- Return information about slots range mappings. Each range is made of:24) start, end, master and replicas IP addresses, ports and ids

查看客户端提供的集群相关命令：redis-cli --cluster help

Cluster Manager Commands: create host1:port1 ... hostN:portN --cluster-replicas <arg> check host:port --cluster-search-multiple-owners info host:port fix host:port --cluster-search-multiple-owners reshard host:port --cluster-from <arg> --cluster-to <arg> --cluster-slots <arg> --cluster-yes --cluster-timeout <arg> --cluster-pipeline <arg> --cluster-replace rebalance host:port --cluster-weight <node1=w1...nodeN=wN> --cluster-use-empty-masters --cluster-timeout <arg> --cluster-simulate --cluster-pipeline <arg> --cluster-threshold <arg> --cluster-replace add-node new_host:new_port existing_host:existing_port --cluster-slave --cluster-master-id <arg> del-node host:port node_id call host:port command arg arg .. arg set-timeout host:port milliseconds import host:port --cluster-from <arg> --cluster-copy --cluster-replace

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