三台主机搭建Redis的三对主从服务器集群环境准备 host1:192.168.1.9:6379 192.168.1.9:6380 host2:192.168.1.106:6379 192.168.1.106:6380 host3:192.168.1.110:6379 192.168.1.110:6380 注意： （1）在建立redis的cluster环境时
三台主机搭建Redis的三对主从服务器集群环境准备
host1:192.168.1.9:6379 192.168.1.9:6380host2:192.168.1.106:6379 192.168.1.106:6380host3:192.168.1.110:6379 192.168.1.110:6380注意：（1）在建立redis的cluster环境时必须清空所有redis服务的所有key-value数据，没有任何数据（2）每个 redis node 节点采用相同的硬件配置、相同的密码
1.分别开启三台主机的6379和6380两个端口，需给redis配置两个独立的配置文件，以host1为例
1）给redis配置6379监听端口
[root@localhost ~]# vim /app/redis/etc/redis.conf …… bind 192.168.1.9 #绑定ip …… port 6379 #绑定6379端口 …… cluster-enabled yes #开启redis的集群功能 …… cluster-config-file nodes-6379.conf #开启自动创建集群配置文件 ……
2）给redis配置6380监听端口
[root@localhost ~]# cp/app/redis/etc/redis.conf /app/redis/etc/redis.6380.conf [root@localhost ~]# vim /app/redis/etc/redis.6380.conf …… bind 192.168.1.9 #绑定ip …… port 6380 #绑定6380端口 …… cluster-enabled yes #开启redis的集群功能 …… cluster-config-file nodes-6379.conf #开启自动创建集群配置文件 …… :%s/6379/6380/g #配置文件底部实现全局替换，将所有6379替换为6380
2.三台主机redis配置文件设置完成后再启动redis服务
1）同时开启两个redis进程服务
[root@localhost ~]# redis-server /app/redis/etc/redis.6380.conf && redis-server /app/redis/etc/redis.conf
2）查看redis的6379和6380两个端口是否处于监听状态
[root@localhost ~]# ss -tnlpState Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 511 192.168.1.9:6379 *:* users:(("redis-server",pid=7492,fd=6))LISTEN 0 511 192.168.1.9:6380 *:* users:(("redis-server",pid=7487,fd=6))LISTEN 0 511 192.168.1.9:16379 *:* users:(("redis-server",pid=7492,fd=8))LISTEN 0 511 192.168.1.9:16380 *:* users:(("redis-server",pid=7487,fd=8))
3.将创建集群的命令redis-trib.rb复制到/usr/bin下，此命令暂时不可用，还需编译安装ruby以及安装redis模块
[root@localhost ruby-2.5.5]# cp redis-trib.rb /usr/bin
4.安装编译ruby工具包时编译环境
yum ×××tall -y vim lrzsz tree screen psmisc lsof tcpdump wget ntpdate gcc gcc-c++ glibc glibc-devel pcre pcre-devel openssl openssl-devel systemd-devel net-tools iotop bc zip unzip zlib-devel bash-completion nfs-utils automake libxml2 libxml2-devel libxslt libxslt-devel perl perl-ExtUtils-Embed
5.编译安装ruby工具包（因yum安装的ruby版本太低，不能满足gem安装redis模块所依赖的ruby版本）
[root@localhost ~]# cd /data/ruby/[root@localhost ruby]# tar xf ruby-2.5.5.tar.gz[root@localhost ruby]# cd ruby-2.5.5/[root@localhost ruby-2.5.5]# ./configure && make –j 4 && make ×××tall
6.安装 rubygems包
[root@localhost ruby-2.5.5]# yum ×××tall -y rubygems
7.分别给ruby命令和gem命令创建环境变量路径软连接
[root@localhost ruby-2.5.5]# ln -sv /data/ruby/ruby-2.5.5/bin/gem /usr/bin/[root@localhost ruby-2.5.5]# ln -sv/data/ruby/ruby-2.5.5/ruby /usr/bin/
8.gem安装redis模块
[root@localhost ruby-2.5.5]# gem ×××tall redis -y
9.修改redis模块登录集群环境的密码
[root@localhost ~]# vim /usr/local/lib/ruby/gems/2.5.0/gems/redis-4.1.2/lib/redis/client.rb#frozen_string_literal: true
require_relative "errors"require "socket"require "cgi"
class Redis class Client
DEFAULTS = { :url => lambda { ENV["REDIS_URL"] }, :scheme => "redis", :host => "127.0.0.1", :port => 6379, :path => nil, :timeout => 5.0, :password => 123456, #登录密码改为123456 :db => 0, :driver => nil, ……
10.使用redis-trib.rb命令创建集群环境，会自动分配主从服务
[root@localhost ~]# redis-trib.rb create --replicas 1 192.168.1.9:6379 192.168.1.9:6380 192.168.1.106:6379 192.168.1.106:6380 192.168.1.110:6379 192.168.1.110:6380
>>> Creating cluster>>> Performing hash slots allocation on 6 nodes...Using 3 masters:192.168.1.9:6379192.168.1.106:6379192.168.1.110:6379Adding replica 192.168.1.106:6380 to 192.168.1.9:6379Adding replica 192.168.1.110:6380 to 192.168.1.106:6379Adding replica 192.168.1.9:6380 to 192.168.1.110:6379M: eed2e22136cbdca6770a46bbb2e137ab693dd16b 192.168.1.9:6379 slots:0-5460 (5461 slots) master#主服务：M#主服务id：eed2e22136cbdca6770a46bbb2e137ab693dd16b#主服务ip和端口：192.168.1.9:6379#分得的槽位区间：0-5460#一共分得的槽：5460
S: 8efbcf7fdd4675c77199a2a1206f0209ac2255f3 192.168.1.9:6380 replicates e387a0ba7c95d0c27d7e28a9b57d23117711eadc#从服务：S#从服务id：8efbcf7fdd4675c77199a2a1206f0209ac2255f3#从服务ip和端口：192.168.1.9:6380#从服务所属的主服务id：e387a0ba7c95d0c27d7e28a9b57d23117711eadc
M: c922b4bf56f0086609fd4fb23d987df0a77bec22 192.168.1.106:6379 slots:5461-10922 (5462 slots) masterS: a4fd89d79cdd27698bc394134b2df25b63ddb4c5 192.168.1.106:6380 replicates eed2e22136cbdca6770a46bbb2e137ab693dd16bM: e387a0ba7c95d0c27d7e28a9b57d23117711eadc 192.168.1.110:6379 slots:10923-16383 (5461 slots) masterS: 34549b777963b16e65125def8d9a8e50e27ed2a4 192.168.1.110:6380 replicates c922b4bf56f0086609fd4fb23d987df0a77bec22Can 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 clusterWaiting for the cluster to join..>>> Performing Cluster Check (using node 192.168.1.9:6379)M: eed2e22136cbdca6770a46bbb2e137ab693dd16b 192.168.1.9:6379 slots:0-5460 (5461 slots) master 1 additional replica(s)S: a4fd89d79cdd27698bc394134b2df25b63ddb4c5 192.168.1.106:6380 slots: (0 slots) slave replicates eed2e22136cbdca6770a46bbb2e137ab693dd16bS: 8efbcf7fdd4675c77199a2a1206f0209ac2255f3 192.168.1.9:6380 slots: (0 slots) slave replicates e387a0ba7c95d0c27d7e28a9b57d23117711eadcM: c922b4bf56f0086609fd4fb23d987df0a77bec22 192.168.1.106:6379 slots:5461-10922 (5462 slots) master 1 additional replica(s)M: e387a0ba7c95d0c27d7e28a9b57d23117711eadc 192.168.1.110:6379 slots:10923-16383 (5461 slots) master 1 additional replica(s)S: 34549b777963b16e65125def8d9a8e50e27ed2a4 192.168.1.110:6380 slots: (0 slots) slave replicates c922b4bf56f0086609fd4fb23d987df0a77bec22[OK] All nodes agree about slots configuration.>>> Check for open slots...>>> Check slots coverage...[OK] All 16384 slots covered.
11.查看slave从服务的连接状态，可以看到还未建立主从连接
[root@localhost ~]# redis-cli -h 192.168.1.106 -p 6380192.168.1.106:6380> auth 123456OK192.168.1.106:6380> info replication#Replicationrole:slavemaster_host:192.168.1.9master_port:6379master_link_status:down #未与主服务建立连接master_last_io_seconds_ago:-1master_sync_in_progress:0slave_repl_offset:1master_link_down_since_seconds:1560643385slave_priority:100slave_read_only:1connected_slaves:0master_replid:84865c623e15576c50c80a46ee16845b80b872d8master_replid2:0000000000000000000000000000000000000000master_repl_offset:0second_repl_offset:-1repl_backlog_active:0repl_backlog_size:1048576repl_backlog_first_byte_offset:0repl_backlog_histlen:0
11.三台salve从服务分别手动输入主从连接认证密码
1）输入认证密码
192.168.1.106:6380> config set masterauth 123456OK
2）再次查看salve服务连接状态，可以看到为up表明主从连接成功
192.168.1.106:6380> info replication#Replicationrole:slavemaster_host:192.168.1.9master_port:6379master_link_status:up #主从服务已建立连接master_last_io_seconds_ago:1master_sync_in_progress:0slave_repl_offset:0slave_priority:100slave_read_only:1connected_slaves:0master_replid:df9da60e308938e7a817ca08b20b58c248ad409dmaster_replid2:0000000000000000000000000000000000000000master_repl_offset:0second_repl_offset:-1repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:1repl_backlog_histlen:0
12.实验总结
1） 实现了三台主机搭建3对主从服务器的集群环境，实现冗余可用和较高的并发量；
2）即可允许其中一台主机宕机，被宕掉的一个主服务会被它的从服替代，从服务会被提升为新的主服务，从而不影响另外两台主机服务器的正常工作，也不会丢失数据；
3）减少了主机的数量从而节约成本。
