redis的主从集群环境搭建

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 -tnlp
State      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:
192.168.1.9:6379
192.168.1.106:6379
192.168.1.110:6379
Adding replica 192.168.1.106:6380 to 192.168.1.9:6379
Adding replica 192.168.1.110:6380 to 192.168.1.106:6379
Adding replica 192.168.1.9:6380 to 192.168.1.110:6379
M: 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) master
S: a4fd89d79cdd27698bc394134b2df25b63ddb4c5 192.168.1.106:6380
     replicates eed2e22136cbdca6770a46bbb2e137ab693dd16b
M: e387a0ba7c95d0c27d7e28a9b57d23117711eadc 192.168.1.110:6379
     slots:10923-16383 (5461 slots) master
S: 34549b777963b16e65125def8d9a8e50e27ed2a4 192.168.1.110:6380
     replicates c922b4bf56f0086609fd4fb23d987df0a77bec22
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 192.168.1.9:6379)
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 eed2e22136cbdca6770a46bbb2e137ab693dd16b
S: 8efbcf7fdd4675c77199a2a1206f0209ac2255f3 192.168.1.9:6380
     slots: (0 slots) slave
     replicates e387a0ba7c95d0c27d7e28a9b57d23117711eadc
M: 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 6380
192.168.1.106:6380> auth 123456
OK
192.168.1.106:6380> info  replication
#Replication
role:slave
master_host:192.168.1.9
master_port:6379
master_link_status:down  #未与主服务建立连接
master_last_io_seconds_ago:-1
master_sync_in_progress:0
slave_repl_offset:1
master_link_down_since_seconds:1560643385
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:84865c623e15576c50c80a46ee16845b80b872d8
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_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 123456
OK

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
#Replication
role:slave
master_host:192.168.1.9
master_port:6379
master_link_status:up  #主从服务已建立连接
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_repl_offset:0
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:df9da60e308938e7a817ca08b20b58c248ad409d
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_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。