本文主要是介绍CentOS搭建Redis集群，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

#环境

VMware： VMwareworkstation_full_12.1.0.2487.1453173744.exe
CentOS 7： CentOS Linux release 7.5.1804 (Core)

#redis安装

下载解压拷贝redis

[root@localhost ~]# mkdir /soft && cd /soft
[root@localhost soft]# wget http://download.redis.io/releases/redis-4.0.10.tar.gz
[root@localhost soft]# tar xzf redis-4.0.10.tar.gz
[root@localhost soft]# mv redis-4.0.10 /usr/local/redis-4.0.10 && cd /usr/local/redis-4.0.10

编译redis

[root@localhost redis-4.0.10]# make
cd src && make all
make[1]: 进入目录“/usr/local/redis-4.0.10/src”
    CC Makefile.dep
make[1]: 离开目录“/usr/local/redis-4.0.10/src”
make[1]: 进入目录“/usr/local/redis-4.0.10/src”
rm -rf redis-server redis-sentinel redis-cli redis-benchmark redis-check-rdb redis-check-aof *.o *.gcda *.gcno *.gcov redis.info lcov-html Makefile.dep dict-benchmark
(cd ../deps && make distclean)
make[2]: 进入目录“/usr/local/redis-4.0.10/deps”
(cd hiredis && make clean) > /dev/null || true
(cd linenoise && make clean) > /dev/null || true
(cd lua && make clean) > /dev/null || true
(cd jemalloc && [ -f Makefile ] && make distclean) > /dev/null || true
(rm -f .make-*)
make[2]: 离开目录“/usr/local/redis-4.0.10/deps”
(rm -f .make-*)
echo STD=-std=c99 -pedantic -DREDIS_STATIC='' >> .make-settings
echo WARN=-Wall -W -Wno-missing-field-initializers >> .make-settings
echo OPT=-O2 >> .make-settings
echo MALLOC=jemalloc >> .make-settings
echo CFLAGS= >> .make-settings
echo LDFLAGS= >> .make-settings
echo REDIS_CFLAGS= >> .make-settings
echo REDIS_LDFLAGS= >> .make-settings
echo PREV_FINAL_CFLAGS=-std=c99 -pedantic -DREDIS_STATIC='' -Wall -W -Wno-missing-field-initializers -O2 -g -ggdb   -I../deps/hiredis -I../deps/linenoise -I../deps/lua/src -DUSE_JEMALLOC -I../deps/jemalloc/include >> .make-settings
echo PREV_FINAL_LDFLAGS=  -g -ggdb -rdynamic >> .make-settings
(cd ../deps && make hiredis linenoise lua jemalloc)
make[2]: 进入目录“/usr/local/redis-4.0.10/deps”
(cd hiredis && make clean) > /dev/null || true
(cd linenoise && make clean) > /dev/null || true
(cd lua && make clean) > /dev/null || true
(cd jemalloc && [ -f Makefile ] && make distclean) > /dev/null || true
(rm -f .make-*)
(echo "" > .make-cflags)
(echo "" > .make-ldflags)
MAKE hiredis
cd hiredis && make static
make[3]: 进入目录“/usr/local/redis-4.0.10/deps/hiredis”
gcc -std=c99 -pedantic -c -O3 -fPIC  -Wall -W -Wstrict-prototypes -Wwrite-strings -g -ggdb  net.c
make[3]: gcc：命令未找到
make[3]: *** [net.o] 错误 127
make[3]: 离开目录“/usr/local/redis-4.0.10/deps/hiredis”
make[2]: *** [hiredis] 错误 2
make[2]: 离开目录“/usr/local/redis-4.0.10/deps”
make[1]: [persist-settings] 错误 2 (忽略)
    CC adlist.o
/bin/sh: cc: 未找到命令
make[1]: *** [adlist.o] 错误 127
make[1]: 离开目录“/usr/local/redis-4.0.10/src”
make: *** [all] 错误 2

安装 gcc

[root@localhost redis-4.0.10]# yum install gcc
[root@localhost redis-4.0.10]# make
cd src && make all
make[1]: 进入目录“/usr/local/redis-4.0.10/src”
    CC Makefile.dep
make[1]: 离开目录“/usr/local/redis-4.0.10/src”
make[1]: 进入目录“/usr/local/redis-4.0.10/src”
    CC adlist.o
In file included from adlist.c:34:0:
zmalloc.h:50:31: 致命错误：jemalloc/jemalloc.h：没有那个文件或目录
 #include <jemalloc/jemalloc.h>
                               ^
编译中断。
make[1]: *** [adlist.o] 错误 1
make[1]: 离开目录“/usr/local/redis-4.0.10/src”
make: *** [all] 错误 2

注：如果在make的时候不指定内存管理方式，使用make MALLOC=libc指令。malloc是管理内存碎片的。

[root@localhost redis-4.0.10]# make MALLOC=libc
[root@localhost redis-4.0.10]# make & make install

#创建redis节点

[root@localhost redis-4.0.10]# mkdir conf-cluster && cd conf-cluster
[root@localhost conf-cluster]# touch {9000..9002}.conf

修改{9000..9002}.conf文件。

port 9000
bind 192.168.1.100
daemonize yes
cluster-enabled yes
cluster-node-timeout 15000
appendonly yes
pidfile /var/run/redis_9000.pid
cluster-config-file nodes-9000.conf

启动｛9000..9002｝节点

[root@localhost conf-cluster]# redis-server 9000.conf
[root@localhost conf-cluster]# redis-server 9001.conf
[root@localhost conf-cluster]# redis-server 9002.conf

检查各redis节点启动情况

[root@localhost conf-cluster]# ps -ef | grep redis  //redis节点是否启动成功
[root@localhost conf-cluster]# netstat -tnlp | grep redis  //监听节点端口

#安装ruby

创建集群时需要用Ruby 运行redis-trib.rb

[root@localhost conf-cluster]# yum -y install ruby ruby-devel rubygems rpm-build
[root@localhost conf-cluster]# gem install redis
ERROR:  Could not find a valid gem 'redis' (>= 0), here is why:
          Unable to download data from https://rubygems.org/ - no such name (https://rubygems.org/latest_specs.4.8.gz)

修改 RubyGems 镜像

[root@localhost conf-cluster]# gem sources --add https://gems.ruby-china.org/ --remove https://rubygems.org/
https://gems.ruby-china.org/ added to sources
https://rubygems.org/ removed from sources

[root@localhost conf-cluster]# gem install redis
Fetching: redis-4.0.1.gem (100%)
ERROR:  Error installing redis:
    redis requires Ruby version >= 2.2.2.

Centos默认支持ruby到2.0.0，可gem 安装redis需要最低是2.2.2
解决办法是 先安装rvm，再把ruby版本提升

升级ruby

安装rvm(ruby版本控制)

参考：
https://blog.csdn.net/qq_37595946/article/details/77800147
https://ruby-china.org/wiki/rvm-guide

[root@localhost conf-cluster]# gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
[root@localhost conf-cluster]# curl -L get.rvm.io | bash -s stable
[root@localhost conf-cluster]# source /etc/profile.d/rvm.sh
[root@localhost conf-cluster]# rvm list known
[root@localhost conf-cluster]# rvm install 2.5.1 --disable-binary

DNS
Checking fallback: https://ftp.ruby-lang.org/pub/ruby/2.5/ruby-2.5.1.tar.bz2

# Generated by NetworkManager
+ 8.8.8.8
nameserver 192.168.1.1

切换ruby版本

[root@localhost conf-cluster]# rvm use 2.5.1
[root@localhost conf-cluster]# rvm remove 2.2.0

gem再次安装redis

[root@localhost conf-cluster]# gem install redis
Fetching: redis-4.0.1.gem (100%)
Successfully installed redis-4.0.1
Parsing documentation for redis-4.0.1
Installing ri documentation for redis-4.0.1
Done installing documentation for redis after 0 seconds
1 gem installed

#创建redis集群

[root@localhost conf-cluster]# /usr/local/redis-4.0.10/src/redis-trib.rb create --replicas 1 192.168.1.100:9000 192.168.1.100:9001 192.168.1.100:9002
>>> Creating cluster
*** ERROR: Invalid configuration for cluster creation.
*** Redis Cluster requires at least 3 master nodes.
*** This is not possible with 3 nodes and 1 replicas per node.
*** At least 6 nodes are required.

集群至少需要3主3从6台服务器或进程

复制虚拟机

注： 复制虚拟机，记得修改虚拟机的MAC地址

启动每台虚拟机的redis节点

[root@localhost conf-cluster]# redis-server {9000..9002}.conf

再次创建集群

[root@localhost conf-cluster]# /usr/local/redis-4.0.10/src/redis-trib.rb create --replicas 1 192.168.1.100:9000 192.168.1.100:9001 192.168.1.100:9002 192.168.1.101:9000 192.168.1.101:9001 192.168.1.101:9002
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.1.100:9000
192.168.1.101:9000
192.168.1.100:9001
Adding replica 192.168.1.101:9002 to 192.168.1.100:9000
Adding replica 192.168.1.100:9002 to 192.168.1.101:9000
Adding replica 192.168.1.101:9001 to 192.168.1.100:9001
M: 40d42fcd808b073c839d0b767eb296853a1995ed 192.168.1.100:9000
   slots:0-5460 (5461 slots) master
M: e1b5627a3f06d9dbf6ae75e26a3dfc3127018940 192.168.1.100:9001
   slots:10923-16383 (5461 slots) master
S: 8a84e184bad311182898e7ee3f21280ed094a527 192.168.1.100:9002
   replicates 7d002ccb55e1fac7ec6ae57b3ee710806bbe1b0d
M: 7d002ccb55e1fac7ec6ae57b3ee710806bbe1b0d 192.168.1.101:9000
   slots:5461-10922 (5462 slots) master
S: f77cc08cac4bc93c642820afb6ec9b42710e2f0a 192.168.1.101:9001
   replicates e1b5627a3f06d9dbf6ae75e26a3dfc3127018940
S: 407848979110a89f8804cf61a61c4386779a1a85 192.168.1.101:9002
   replicates 40d42fcd808b073c839d0b767eb296853a1995ed
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 192.168.1.100:9000)
M: 40d42fcd808b073c839d0b767eb296853a1995ed 192.168.1.100:9000
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
S: 8a84e184bad311182898e7ee3f21280ed094a527 192.168.1.100:9002
   slots: (0 slots) slave
   replicates 7d002ccb55e1fac7ec6ae57b3ee710806bbe1b0d
S: 407848979110a89f8804cf61a61c4386779a1a85 192.168.1.101:9002
   slots: (0 slots) slave
   replicates 40d42fcd808b073c839d0b767eb296853a1995ed
S: f77cc08cac4bc93c642820afb6ec9b42710e2f0a 192.168.1.101:9001
   slots: (0 slots) slave
   replicates e1b5627a3f06d9dbf6ae75e26a3dfc3127018940
M: e1b5627a3f06d9dbf6ae75e26a3dfc3127018940 192.168.1.100:9001
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
M: 7d002ccb55e1fac7ec6ae57b3ee710806bbe1b0d 192.168.1.101:9000
   slots:5461-10922 (5462 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.

注：
如果一直卡在Waiting for the cluster to join...
请确保每台机器防火墙开启redis客户端端口及集群总线端口。
例：
如redis端口为9000，则集群总线端口为19000;
集群总线端口为redis客户端连接的端口 + 10000

防火墙操作

[root@localhost ~]# firewall-cmd --zone=public --add-port=9000/tcp --permanent
[root@localhost ~]# firewall-cmd --zone=public --add-port=19000/tcp --permanent
...

[root@localhost ~]# firewall-cmd --reload

[root@localhost conf-cluster]# firewall-cmd --list-ports
9000/tcp 9001/tcp 9002/tcp 19000/tcp 19001/tcp 19002/tcp

#连接redis集群

[root@localhost conf-cluster]# redis-cli -h 192.168.1.100 -c -p 9000
192.168.1.100:9000>

必须要加：-c 参数

添加数据测试

[root@localhost conf-cluster]# redis-cli -h 192.168.1.100 -c -p 9000
192.168.1.100:9000> set title testcluster
OK

在192.168.1.101 9002节点连接，获取数据。直接Redirected 从192.168.1.100:9000 获取数据。

[root@localhost conf-cluster]# redis-cli -h 192.168.1.101 -c -p 9002
192.168.1.101:9002> get title
-> Redirected to slot [2217] located at 192.168.1.100:9000
"testcluster"

redis集群环境配置成功!!!

如果重启服务器后，再次执行redis-trib.rb会报错如下错误：
[ERR] Node 192.168.1.80:6379 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.
解决方法：
删除配置的cluster-config-file pidfile 和生成的dump.rdb ，然后重启redis服务，最后启动集群

关闭redis节点端口

[root@localhost conf-cluster]# redis-cli -h 192.168.1.100 -c -p 9000 shutdown

#参考

http://shift-alt-ctrl.iteye.com/blog/2284890
https://www.cnblogs.com/subendong/p/7417601.html

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