后面曾经简略相熟过redis的下载安装应用，明天接着部署redis集群（cluster），简略领会一下redis集群的高可用个性。

环境筹备

Redis是C语言开发，装置Redis须要先将Redis的源码进行编译，编译依赖gcc环境

装置gcc-c++

yum install gcc-c++

查看版本

[[email protected] redis]# gcc -vUsing built-in specs.COLLECT_GCC=gccCOLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapperTarget: x86_64-redhat-linuxConfigured 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-linuxThread model: posixgcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) [[email protected] redis]#

Redis的四种模式

  1. 单机模式
  2. master+slave(主从)
  3. sentinel(哨兵)
  4. cluster(集群)

创立redis网卡

[[email protected] ~]# docker network create redis --subnet 172.38.0.0/160350d84612bef09bc32b39f15ac6b608dae17cbd75d04b282c0bd37c0283bb7c[[email protected] ~]# docker network lsNETWORK ID     NAME           DRIVER    SCOPEfeafa30d4051   bridge         bridge    locale8bf4fced9e2   host           host      local0096a971fd2c   mynet          bridge    local6263db0933b9   none           null      local0350d84612be   redis          bridge    local799426d70aa2   test-network   bridge    local[[email protected] ~]#

创立6个redis服务

通过编写脚本创立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，主动生成
  • cluster-node-timeout 毫秒值： 配置节点连贯超时工夫
  • appendonly：是否开启长久化，选值：yes、no
  • daemonize: 守护过程启动(后盾启动)

在/var目录下创立脚本文件create_redis_script.sh

touch create_redis_script.sh

编写脚本内容

vim create_redis_script.sh，写入上面的内容

for port in $(seq    1 6); \do \mkdir -p /var/redisNode/node-${port}/conftouch /var/redisNode/node-${port}/conf/redis.confcat << EOF >/var/redisNode/node-${port}/conf/redis.confport 6379bind 0.0.0.0cluster-enabled yescluster-config-file nodes.confcluster-node-timeout 5000cluster-announce-ip 172.38.0.1${port}cluster-announce-port 6379cluster-announce-bus-port 16379appendonly yes#daemonize yesEOFdone

查看脚本文件

cat create_redis_script.sh

赋予create_redis_script.sh文件可执行权限

[[email protected] ~]# chmod o+x create_redis_script.sh

执行脚本，创立redis服务

./create_redis_script.sh

查看redis节点

[[email protected] redisNode]# pwd/var/redisNode[[email protected] redisNode]# lsnode-1  node-2  node-3  node-4  node-5  node-6[[email protected] 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 应用自定义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

启动形式一（不举荐）：

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，相似的，递增ip、port和name，启动其它五个redis节点，太麻烦了，能够通过编写脚本来一次启动6个服务

启动形式二（举荐）：

编写启动脚本，6个全副启动

创立start_redis_script.sh文件

touch start_redis_script.sh

编写脚本内容

vim start_redis_script.sh，写入上面的内容

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

[[email protected] ~]# 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

[[email protected] var]# docker psCONTAINER ID   IMAGE                    COMMAND                  CREATED              STATUS              PORTS                                              NAMES0d3c18b61098   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-6ee896fb093da   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-5a83bb7b16dff   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-4ffe4c9619bed   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-3a316a31e273f   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-271c072f57c29   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[[email protected] var]#

创立集群

进入任意一个 Redis 实例

进入redis-1容器

docker exec -it redis-1 /bin/sh

创立集群主节点

  • Redis Cluster最低要求是3个主节点
  • --cluster-replicas 参数为数字，1示意每个主节点须要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

测试连贯集群

连贯集群 -c

# redis-1 容器内/data # redis-cli -c127.0.0.1:6379>

查看集群信息 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:292cluster_stats_messages_pong_sent:307cluster_stats_messages_sent:599cluster_stats_messages_ping_received:302cluster_stats_messages_pong_received:292cluster_stats_messages_meet_received:5cluster_stats_messages_received:599127.0.0.1:6379>

查看节点信息 cluster nodes

127.0.0.1:6379> cluster nodesb3f737d0d77b823794087011f1501fd43a2ea316 172.38.0.12:[email protected] master - 0 1633332452560 2 connected 5461-10922506ff2bf1020d468e7d7a81ddbfb616a7e9b7d96 172.38.0.13:[email protected] master - 0 1633332453000 3 connected 10923-163837f57f8a01493fa9e46e24ad8a9e46995634f7442 172.38.0.15:[email protected] slave 70ebdca0264c079bb2c33452e6388d37706da282 0 1633332453000 5 connected70ebdca0264c079bb2c33452e6388d37706da282 172.38.0.11:[email protected] myself,master - 0 1633332452000 1 connected 0-5460f839b6924977e99d3b74324f2ef70b3678e1a257 172.38.0.14:[email protected] slave 506ff2bf1020d468e7d7a81ddbfb616a7e9b7d96 0 1633332453762 4 connectedbbc4dd0639b90e9ddfb5cef278be04a24276cbdb 172.38.0.16:[email protected] slave b3f737d0d77b823794087011f1501fd43a2ea316 0 1633332453000 6 connected127.0.0.1:6379>

测试主从节点替换

验证高可用

set一个值，而后停掉对应的服务，再次get，验证是否能够失去值

set值

127.0.0.1:6379> set a b-> Redirected to slot [15495] located at 172.38.0.13:6379OK172.38.0.13:6379>

发现a值设置在了172.38.0.13容器上，而后咱们试着去停掉redis-3容器的服务，而后再次get,看一下后果

get值

172.38.0.13:6379> get a"b"172.38.0.13:6379>

进行redis-3容器里的redis服务

docker stop redis-3

再次取值

172.38.0.13:6379> get aCould 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 -c127.0.0.1:6379> 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产生故障时，主动替换到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集群实现

我是 甜点cc

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