linux运维、架构之路redis集群

[root@redsi ~]# cat /etc/redhat-release 
CentOS release 6.9 (Final)
[root@redsi ~]# uname -r
2.6.32-696.el6.x86_64
[root@redsi ~]# /etc/init.d/iptables status
iptables: Firewall is not running.
[root@redsi ~]# getenforce 
Disabled
[root@redsi ~]# hostname -I
10.0.0.2

mkdir /usr/local/redis-cluster/{9001..9006}/data -p
[root@redsi redis-cluster]# ll /usr/local/redis-cluster/
total 28
drwxr-xr-x 5 root root 4096 2018-05-16 17:17 9001
drwxr-xr-x 5 root root 4096 2018-05-16 14:23 9002
drwxr-xr-x 5 root root 4096 2018-05-16 14:24 9003
drwxr-xr-x 5 root root 4096 2018-05-16 14:28 9004
drwxr-xr-x 5 root root 4096 2018-05-16 14:30 9005
drwxr-xr-x 5 root root 4096 2018-05-16 14:34 9006
drwxr-xr-x 2 root root 4096 2018-05-16 14:54 bin

mkdir /usr/local/redis-cluster/bin -p
cd /server/tools/redis-3.2.8/src
cp mkreleasehdr.sh redis-benchmark redis-check-aof redis-check-dump redis-cli redis-server redis-trib.rb /usr/local/redis-cluster/bin

cp -a /usr/local/redis/* /usr/local/redis-cluster/9001/

port 9001                                #每个节点的端口号
daemonize yes
bind 10.0.0.2                            #绑定当前机器 IP
dir /usr/local/redis-cluster/9001/data/  #数据文件存放位置
pidfile /var/run/redis_9001.pid          #pid 9001和port要对应
cluster-enabled yes                      #启动集群模式
cluster-config-file nodes9001.conf       #9001和port要对应
cluster-node-timeout 15000
appendonly yes

cp -a /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9002
cp -a /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9003
cp -a /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9004
cp -a /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9005
cp -a /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9006

port 9001                                #修改以下4处，依次改为9002、9003、9004、9005、9006
dir /usr/local/redis-cluster/9001/data/  
pidfile /var/run/redis_9001.pid         
cluster-config-file nodes9001.conf       

gem install redis  
    ERROR:  Error installing redis:  
            redis requires Ruby version >= 2.2.2.  

gpg2 --keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3  
curl -L get.rvm.io | bash -s stable  
find / -name rvm -print  

rvm list known 

rvm install 2.3.3 

rvm use 2.3.3  

rvm use 2.3.3 --default 

rvm remove 2.0.0

gem install redis 

ruby --version 

redis-server /usr/local/redis-cluster/9001/redis.conf 
redis-server /usr/local/redis-cluster/9002/redis.conf 
redis-server /usr/local/redis-cluster/9003/redis.conf 
redis-server /usr/local/redis-cluster/9004/redis.conf 
redis-server /usr/local/redis-cluster/9005/redis.conf 
redis-server /usr/local/redis-cluster/9006/redis.conf
###查看进程###
[root@redsi ~]# ps aux|grep redis
root       2441  0.1  0.9 135592  9788 ?        Ssl  08:28   0:21 redis-server 10.0.0.2:9001 [cluster]                
root       2445  0.1  0.9 135592  9800 ?        Ssl  08:29   0:20 redis-server 10.0.0.2:9002 [cluster]                
root       2449  0.1  0.9 135592  9792 ?        Ssl  08:29   0:21 redis-server 10.0.0.2:9003 [cluster]                
root       2453  0.1  0.7 133544  7728 ?        Ssl  08:29   0:21 redis-server 10.0.0.2:9004 [cluster]                
root       2457  0.1  0.9 135592  9808 ?        Ssl  08:29   0:20 redis-server 10.0.0.2:9005 [cluster]                
root       2461  0.1  0.9 135592  9784 ?        Ssl  08:29   0:20 redis-server 10.0.0.2:9006 [cluster]

/usr/local/redis-cluster/bin/redis-trib.rb create --replicas 1 10.0.0.2:9001 10.0.0.2:9002 10.0.0.2:9003 10.0.0.2:9004 10.0.0.2:9005 10.0.0.2:9006

调用ruby命令来进行创建集群，--replicas 1 表示主从复制比例为 1:1，即一个主节点对应一个从节点；然后，默认给我们分配好了每个主节点和对应从节点服务，以及solt的大小，因为在Redis 集群中有且仅有 16383 个 solt ，默认情况会给我们平均分配，当然你可以指定，后续的增减节点也可以重新分配。

[root@redsi ~]# redis-cli -h 10.0.0.2 -c -p 9001
10.0.0.2:9001> set name lulu
-> Redirected to slot [5798] located at 10.0.0.2:9002  #自动连接到了9002节点，这是集群的一个数据分配特性
OK
10.0.0.2:9002> get name
"lulu"

[root@redsi ~]# redis-cli -h 10.0.0.2 -c -p 9003
10.0.0.2:9003> get name
-> Redirected to slot [5798] located at 10.0.0.2:9002
"lulu"