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Redis集群部署
Redis5版本前（redis3.x及redis4.x）cluster部署较麻烦，因部署过程中涉及的依赖软件版本要求较苛刻，因此记录一下redis4.0.14版本redis cluster的部署过程。
1 Redis各节点部署
使用源码安装各节点，不过与非cluster方式不同的是，配置文件中需启动cluster相关的配置。编译过程可参考分分钟搞定Redis编译安装
因本次为伪分布式部署，生产环境部署时建议至少3台机器部署（其中每台机器1主1从）
| ip | port |
| 192.168.56.101 | 7000 |
| 192.168.56.101 | 7001 |
| 192.168.56.101 | 7002 |
| 192.168.56.101 | 7003 |
| 192.168.56.101 | 7004 |
| 192.168.56.101 | 7005 |
1.1 启动cluster各节点
创建数据目录
mkdir -p /data/redis/cluster/{7000,7001,7002,7003,7004,7005} 配置文件中主要修改如下内容，其他的可按需调整，也可保持默认值，各节点中注意修改对应的端口号
bind 192.168.56.101 port 7000 daemonize yes pidfile /data/redis/cluster/7000/redis_7000.pid logfile "/data/redis/cluster/7000/redis_7000.log" appendonly yes appendfilename "appendonly.aof" appendfsync everysec cluster-enabled yes cluster-config-file nodes-7000.conf #注意此文件自动生成，且初始化时不要有和此重名的文件 cluster-node-timeout 5000 cluster-slave-validity-factor 10 cluster-migration-barrier 1 cluster-require-full-coverage yes cluster-slave-no-failover no 启动各节点，建议用redis用户启动
useradd redis chown -R redis:redis /data/redis/ su - redis cd /data/redis/cluster/7001 cp /data/redis/cluster/7000/redis.conf . sed -i "s#7000#7001#g" redis.conf redis-server redis.conf 其他节点和7001类似启动，启动后进程中会标记redis节点以cluster模式启动
2. 按照依赖
因redis5之前版本前cluster安装依赖ruby，且版本要求比较苛刻，本次安装的版本redis4.0.14，依赖的ruby版本为>=ruby2.4,因此大家安装时可以安装高版本的ruby，本次我使用的是ruby2.7.5版本
2.1 编译安装ruby
下载ruby，建议从官网下载源码进行编译安装
https://www.ruby-lang.org/en/downloads/
tar -zxvf ruby-2.7.5.tar.gz cd ruby-2.7.5 ./configure make make install 安装完毕后，检查ruby以及gem版本
2.2 安装openssl-devel及zlib-devel
安装完ruby后，使用gem安装redis包，此时如果没有安装openssl 则回报如下错误
gem install redis ERROR: Loading command: install (LoadError) cannot load such file -- openssl ERROR: While executing gem ... (NoMethodError) undefined method `invoke_with_build_args' for nil:NilClass 按照过程如下：
yum方式先安装openssl
yum install openssl-devel -y 再进入ruby源码目录中的ext目录下，找到openssl目录，进入后进行安装
cd ruby-2.7.5/ext/openssl ruby extconf.rb make make install zlib-devel包如报错，也可同上方式处理。
在执行make,若出现如下报错：
make: *** 没有规则可以创建“ossl_asn1.o”需要的目标“/include/ruby.h” 停止。 可以在Makefile顶部中的增加 top_srcdir = …/…
再次执行 make && make install
2.3 gem安装redis
gem install redis 3. 初始化redis集群
相关依赖安装完成后，即可初始化redis集群，命令及过程如下：
[redis@localhost redis-4.0.14]$ src/redis-trib.rb create --replicas 1 192.168.56.101:7000 192.168.56.101:7001 192.168.56.101:7002 192.168.56.101:7003 192.168.56.101:7004 192.168.56.101:7005 >>> Creating cluster >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 192.168.56.101:7000 192.168.56.101:7001 192.168.56.101:7002 Adding replica 192.168.56.101:7004 to 192.168.56.101:7000 Adding replica 192.168.56.101:7005 to 192.168.56.101:7001 Adding replica 192.168.56.101:7003 to 192.168.56.101:7002 >>> Trying to optimize slaves allocation for anti-affinity [WARNING] Some slaves are in the same host as their master M: cd6663924f0c31e6b60b815dca9cb7ea863f5573 192.168.56.101:7000 slots:0-5460 (5461 slots) master M: abc1f43c9a4e8813e9da15433ac66cd185dc39fe 192.168.56.101:7001 slots:5461-10922 (5462 slots) master M: 43fa53cec1ae164f784e5d439aaf80ee2f7e35af 192.168.56.101:7002 slots:10923-16383 (5461 slots) master S: 6ffcd16f1d445b0091c6239bc0988fb8a77fac96 192.168.56.101:7003 replicates cd6663924f0c31e6b60b815dca9cb7ea863f5573 S: c523846d491f8df0bc97033b025b0d24375a13f8 192.168.56.101:7004 replicates abc1f43c9a4e8813e9da15433ac66cd185dc39fe S: 905dc9de7e074c282aab44b4ed5680a2020bcf4c 192.168.56.101:7005 replicates 43fa53cec1ae164f784e5d439aaf80ee2f7e35af 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 192.168.56.101:7000) M: cd6663924f0c31e6b60b815dca9cb7ea863f5573 192.168.56.101:7000 slots:0-5460 (5461 slots) master 1 additional replica(s) M: 43fa53cec1ae164f784e5d439aaf80ee2f7e35af 192.168.56.101:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s) S: c523846d491f8df0bc97033b025b0d24375a13f8 192.168.56.101:7004 slots: (0 slots) slave replicates abc1f43c9a4e8813e9da15433ac66cd185dc39fe S: 6ffcd16f1d445b0091c6239bc0988fb8a77fac96 192.168.56.101:7003 slots: (0 slots) slave replicates cd6663924f0c31e6b60b815dca9cb7ea863f5573 M: abc1f43c9a4e8813e9da15433ac66cd185dc39fe 192.168.56.101:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s) S: 905dc9de7e074c282aab44b4ed5680a2020bcf4c 192.168.56.101:7005 slots: (0 slots) slave replicates 43fa53cec1ae164f784e5d439aaf80ee2f7e35af [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. 至此，redis集群初始化完毕，各节点slot范围及角色也打印出来了
经历了redis5.x之前（redis3.x或redis4.x）集群部署过程中ruby版本及各种依赖包蹂躏后，再感受一下redis5.x之后集群部署的便捷。
1、安装redis集群节点
因本次为伪分布式部署，生产环境部署时建议至少3台机器部署（其中每台机器1主1从），依旧和redis4.0.14的方式一样部署
| ip | port |
| 192.168.56.101 | 7000 |
| 192.168.56.101 | 7001 |
| 192.168.56.101 | 7002 |
| 192.168.56.101 | 7003 |
| 192.168.56.101 | 7004 |
| 192.168.56.101 | 7005 |
1.1 启动cluster各节点
创建数据目录
mkdir -p /data/redis/cluster/{7000,7001,7002,7003,7004,7005} 配置文件中主要修改如下内容，其他的可按需调整，也可保持默认值，各节点中注意修改对应的端口号
bind 192.168.56.103 port 7000 daemonize yes pidfile /data/redis/cluster/7000/redis_7000.pid logfile "/data/redis/cluster/7000/redis_7000.log" appendonly yes appendfilename "appendonly.aof" appendfsync everysec cluster-enabled yes cluster-config-file nodes-7000.conf #注意此文件自动生成，且初始化时不要有和此重名的文件 cluster-node-timeout 5000 cluster-slave-validity-factor 10 cluster-migration-barrier 1 cluster-require-full-coverage yes cluster-slave-no-failover no 启动各节点，建议用redis用户启动
useradd redis chown -R redis:redis /data/redis/ su - redis cd /data/redis/cluster/7001 cp /data/redis/cluster/7000/redis.conf . sed -i "s#7000#7001#g" redis.conf redis-server redis.conf 其他节点和7001类似启动，启动后进程中会标记redis节点以cluster模式启动
2. 初始化集群
redis5.x之后的版本初始化集群相当便捷，命令及过程如下
redis-cli --cluster create --cluster-replicas 1 192.168.56.103:7000 192.168.56.103:7001 192.168.56.103:7002 192.168.56.103:7003 192.168.56.103:7004 192.168.56.103:7005 >>> Performing hash slots allocation on 6 nodes... Master[0] -> Slots 0 - 5460 Master[1] -> Slots 5461 - 10922 Master[2] -> Slots 10923 - 16383 Adding replica 192.168.56.103:7004 to 192.168.56.103:7000 Adding replica 192.168.56.103:7005 to 192.168.56.103:7001 Adding replica 192.168.56.103:7003 to 192.168.56.103:7002 >>> Trying to optimize slaves allocation for anti-affinity [WARNING] Some slaves are in the same host as their master M: 84ea774c08450db01bf5a518e3b9e55fd26d4d34 192.168.56.103:7000 slots:[0-5460] (5461 slots) master M: eb98e53273fd348deb5eabcc6bfffc20484749b1 192.168.56.103:7001 slots:[5461-10922] (5462 slots) master M: e059d418c11401189558d0f33bd5658297c10939 192.168.56.103:7002 slots:[10923-16383] (5461 slots) master S: 23eed1c27ad11c685e5a226e2f82d5c0b6384c79 192.168.56.103:7003 replicates e059d418c11401189558d0f33bd5658297c10939 S: cfa2549ea7782bb4f0ed6d45e9e3704a7d38d540 192.168.56.103:7004 replicates 84ea774c08450db01bf5a518e3b9e55fd26d4d34 S: c3e14c4139bfa88af03ea97679715f051a122806 192.168.56.103:7005 replicates eb98e53273fd348deb5eabcc6bfffc20484749b1 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 192.168.56.103:7000) M: 84ea774c08450db01bf5a518e3b9e55fd26d4d34 192.168.56.103:7000 slots:[0-5460] (5461 slots) master 1 additional replica(s) S: 23eed1c27ad11c685e5a226e2f82d5c0b6384c79 192.168.56.103:7003 slots: (0 slots) slave replicates e059d418c11401189558d0f33bd5658297c10939 M: eb98e53273fd348deb5eabcc6bfffc20484749b1 192.168.56.103:7001 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: c3e14c4139bfa88af03ea97679715f051a122806 192.168.56.103:7005 slots: (0 slots) slave replicates eb98e53273fd348deb5eabcc6bfffc20484749b1 S: cfa2549ea7782bb4f0ed6d45e9e3704a7d38d540 192.168.56.103:7004 slots: (0 slots) slave replicates 84ea774c08450db01bf5a518e3b9e55fd26d4d34 M: e059d418c11401189558d0f33bd5658297c10939 192.168.56.103:7002 slots:[10923-16383] (5461 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. 看到如下结果，代表成功配置并分配slot完成
查看各节点信息也可以用如下命令
[redis@localhost 7005]$ redis-cli -h 192.168.56.103 -p 7000 cluster nodes 23eed1c27ad11c685e5a226e2f82d5c0b6384c79 192.168.56.103:7003@17003 slave e059d418c11401189558d0f33bd5658297c10939 0 1646118171000 4 connected eb98e53273fd348deb5eabcc6bfffc20484749b1 192.168.56.103:7001@17001 master - 0 1646118171604 2 connected 5461-10922 c3e14c4139bfa88af03ea97679715f051a122806 192.168.56.103:7005@17005 slave eb98e53273fd348deb5eabcc6bfffc20484749b1 0 1646118171000 6 connected cfa2549ea7782bb4f0ed6d45e9e3704a7d38d540 192.168.56.103:7004@17004 slave 84ea774c08450db01bf5a518e3b9e55fd26d4d34 0 1646118170000 5 connected e059d418c11401189558d0f33bd5658297c10939 192.168.56.103:7002@17002 master - 0 1646118169590 3 connected 10923-16383 84ea774c08450db01bf5a518e3b9e55fd26d4d34 192.168.56.103:7000@17000 myself,master - 0 1646118171000 1 connected 0-5460 