环境准备
Redis是C语言开发，安装Redis需要先将Redis的源码进行编译，编译依赖gcc环境
安装gcc-c++
yum install gcc-c++
查看版本
gcc -v
[root@--- redis]# gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux Thread model: posix gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) [root@--- redis]#
Redis的四种模式
- 单机模式
- master+slave(主从)
- sentinel(哨兵)
- cluster(集群)
创建redis网卡
[root@--- ~]# docker network create redis --subnet 172.38.0.0/16 0350d84612bef09bc32b39f15ac6b608dae17cbd75d04b282c0bd37c0283bb7c [root@iZm5e23n3ueobwkjtfartxZ ~]# docker network ls NETWORK ID NAME DRIVER SCOPE feafa30d4051 bridge bridge local e8bf4fced9e2 host host local 0096a971fd2c mynet bridge local 6263db0933b9 none null local 0350d84612be redis bridge local 799426d70aa2 test-network bridge local [root@--- ~]#
创建6个redis服务
通过编写脚本创建6个redis服务
- cluster-enabled：是否启动集群，选值：yes 、no
- cluster-config-file 配置文件.conf ：指定节点信息，自动生成
- cluster-node-timeout 毫秒值： 配置节点连接超时时间
- appendonly：是否开启持久化，选值：yes、no
- daemonize: 守护进程启动(后台启动)
在/var目录下创建脚本文件
create_redis_script.sh
touch create_redis_script.sh
编写脚本内容
vim create_redis_script.sh，写入下面的内容
for port in $(seq 1 6); \ do \ mkdir -p /var/redisNode/node-${port}/conf touch /var/redisNode/node-${port}/conf/redis.conf cat << EOF >/var/redisNode/node-${port}/conf/redis.conf port 6379 bind 0.0.0.0 cluster-enabled yes cluster-config-file nodes.conf cluster-node-timeout 5000 cluster-announce-ip 172.38.0.1${port} cluster-announce-port 6379 cluster-announce-bus-port 16379 appendonly yes #daemonize yes EOF done
查看脚本文件
cat create_redis_script.sh
赋予create_redis_script.sh文件可执行权限
chmod o+x create_redis_script.sh
执行脚本，创建redis服务
./create_redis_script.sh
查看redis节点
[root@--- redisNode]# pwd /var/redisNode [root@--- redisNode]# ls node-1 node-2 node-3 node-4 node-5 node-6 [root@--- redisNode]#
查看redis.conf配置文件
启动redis服务
- -v 挂载数据卷
- redis:5.0.9-alpine3.11 redis镜像
- 6379 是redis端口： 映射云服务器端口6371 - 6376
- 16379 是redis集群TCP端口： 映射云服务器端口16371 - 16376
- --net 使用自定义redis网络
- --ip 是本容器绑定的ip： 172.38.0.11 - 16
- --name 容器名字： redis-1 - 6
- redis-server /etc/redis/redis.conf 追加命令，通过redis.conf启动
启动方式一（不推荐）：
一个一个启动
启动第一个redis节点
docker run -p 6371:6379 -p 16371:16379 --name redis-1 \ -v /var/redisNode/node-1/data:/data \ -v /var/redisNode/node-1/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.38.0.11 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf
如上，类似的，递增ip、port和name，启动其它五个redis节点，太麻烦了，可以通过编写脚本来一次启动6个服务
启动方式二（推荐）：
编写启动脚本，6个全部启动
创建start_redis_script.sh文件
touch start_redis_script.sh
编写脚本内容
vim start_redis_script.sh，写入下面的内容
for port in $(seq 1 6); \ do \ echo ${port} docker run -p 637${port}:6379 -p 1637${port}:16379 --name redis-${port} \ -v /var/redisNode/node-${port}/data:/data \ -v /var/redisNode/node-${port}/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.38.0.1${port} redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf; \ done
赋予start_redis_script.sh文件可执行权限
chmod o+x start_redis_script.sh
执行脚本，启动redis容器服务
./start_redis_script.sh
查看redis容器
[root@--- var]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 0d3c18b61098 redis:5.0.9-alpine3.11 "docker-entrypoint.s…" 2 seconds ago Up 1 second 0.0.0.0:6376->6379/tcp, 0.0.0.0:16376->16379/tcp redis-6 ee896fb093da redis:5.0.9-alpine3.11 "docker-entrypoint.s…" 13 seconds ago Up 12 seconds 0.0.0.0:6375->6379/tcp, 0.0.0.0:16375->16379/tcp redis-5 a83bb7b16dff redis:5.0.9-alpine3.11 "docker-entrypoint.s…" 48 seconds ago Up 47 seconds 0.0.0.0:6374->6379/tcp, 0.0.0.0:16374->16379/tcp redis-4 ffe4c9619bed redis:5.0.9-alpine3.11 "docker-entrypoint.s…" 58 seconds ago Up 57 seconds 0.0.0.0:6373->6379/tcp, 0.0.0.0:16373->16379/tcp redis-3 a316a31e273f redis:5.0.9-alpine3.11 "docker-entrypoint.s…" About a minute ago Up About a minute 0.0.0.0:6372->6379/tcp, 0.0.0.0:16372->16379/tcp redis-2 71c072f57c29 redis:5.0.9-alpine3.11 "docker-entrypoint.s…" 9 minutes ago Up 9 minutes 0.0.0.0:6371->6379/tcp, 0.0.0.0:16371->16379/tcp redis-1 [root@--- var]#
创建集群
进入任意一个 Redis 实例
进入redis-1容器
docker exec -it redis-1 /bin/sh
创建集群主节点
- Redis Cluster最低要求是3个主节点
- --cluster-replicas 参数为数字，1表示每个主节点需要1个从节点。
# redis-1 容器内 /data # redis-cli --cluster create 172.38.0.11:6379 172.38.0.12:6379 172.38.0.13:6379 172.38.0.14:6379 172.38.0.15:6379 172.38.0.16:6379 --cluster-replicas 1
测试连接集群
连接集群 -c
# redis-1 容器内 /data # redis-cli -c 127.0.0.1:6379>
查看集群信息 cluster info
127.0.0.1:6379> cluster info cluster_state:ok cluster_slots_assigned:16384 cluster_slots_ok:16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:6 cluster_size:3 cluster_current_epoch:6 cluster_my_epoch:1 cluster_stats_messages_ping_sent:292 cluster_stats_messages_pong_sent:307 cluster_stats_messages_sent:599 cluster_stats_messages_ping_received:302 cluster_stats_messages_pong_received:292 cluster_stats_messages_meet_received:5 cluster_stats_messages_received:599 127.0.0.1:6379>
查看节点信息 cluster nodes
127.0.0.1:6379> cluster nodes b3f737d0d77b823794087011f1501fd43a2ea316 172.38.0.12:6379@16379 master - 0 1633332452560 2 connected 5461-10922 506ff2bf1020d468e7d7a81ddbfb616a7e9b7d96 172.38.0.13:6379@16379 master - 0 1633332453000 3 connected 10923-16383 7f57f8a01493fa9e46e24ad8a9e46995634f7442 172.38.0.15:6379@16379 slave 70ebdca0264c079bb2c33452e6388d37706da282 0 1633332453000 5 connected 70ebdca0264c079bb2c33452e6388d37706da282 172.38.0.11:6379@16379 myself,master - 0 1633332452000 1 connected 0-5460 f839b6924977e99d3b74324f2ef70b3678e1a257 172.38.0.14:6379@16379 slave 506ff2bf1020d468e7d7a81ddbfb616a7e9b7d96 0 1633332453762 4 connected bbc4dd0639b90e9ddfb5cef278be04a24276cbdb 172.38.0.16:6379@16379 slave b3f737d0d77b823794087011f1501fd43a2ea316 0 1633332453000 6 connected 127.0.0.1:6379>
测试主从节点替换
验证高可用
set一个值，然后停掉对应的服务，再次get，验证是否可以得到值
set值
127.0.0.1:6379> set a b -> Redirected to slot [15495] located at 172.38.0.13:6379 OK 172.38.0.13:6379>
发现a值设置在了172.38.0.13容器上，然后我们试着去停掉redis-3容器的服务，然后再次get,看一下结果
get值
172.38.0.13:6379> get a "b" 172.38.0.13:6379>
停止redis-3容器里的redis服务
docker stop redis-3
再次取值
172.38.0.13:6379> get a Could not connect to Redis at 172.38.0.13:6379: Host is unreachable (34.04s) not connected> exit # 重连集群 /data # redis-cli -c 127.0.0.1:6379> get a -> Redirected to slot [15495] located at 172.38.0.14:6379 "b" 172.38.0.14:6379>
发现a值被存储到了172.38.0.14机器上，172.38.0.14是172.38.0.13的从节点，当主节点172.38.0.13发生故障时，自动替换到172.38.0.13，这就是高可用
查看redis节点服务信息
发现172.38.0.13节点fail, 172.38.0.14变成master
docker搭建redis集群完成🎈🎈
