redis

Posted 2020-10-07 _裸奔到月球

　　1、启动：[[email protected] bin]# ./redis-server redis.conf

　　　　进入客户端：./redis-cli(redis内置客户端)

　　2、常用数据类型：String、Hash、List、Set、SortedSet

　　3、redis集群：

　　　　　　集群有16384个槽，由几个redis平分；

　　　　　　根据要存进来的key通过算法计算得到结果，再除以16384得到余数，放入相应槽中；

　　　　　　master节点挂掉：如果半数以上master节点与master节点通信超过(cluster-node-timeout),认为当前master节点挂掉

　　　　　　　　如果集群任意master挂掉,且当前master没有slave.集群进入fail状态。集群有一主一备redis

 

　　　　　　整个集群fail：如果集群超过半数以上master挂掉，无论是否有slave集群进入fail状态

　　4、搭建集群：

 搭建集群需要的环境

 

　　搭建集群需要使用到官方提供的ruby脚本。

 

　　需要安装ruby的环境。安装ruby

 

　　yum install ruby

 

　　yum install rubygems

 

 

 

　　redis集群管理工具redis-trib.rb

 

[[email protected] ~]# cd redis-3.0.0

 

[[email protected] redis-3.0.0]# cd src

 

[[email protected] src]# ll *.rb

 

-rwxrwxr-x. 1 root root 48141 Apr  1 07:01 redis-trib.rb

 

 　脚本需要的ruby包：redis-3.0.0.gem

 

需要上传到linux服务。

 

安装ruby的包：

 

gem install redis-3.0.0.gem

 

[[email protected] ~]# gem install redis-3.0.0.gem

 

1.1 集群的搭建

第一步：创建6个redis实例，端口号从7001~7006

第二步：修改redis的配置文件 (cd /usr/local/redis)(cp -r bin ../redis-cluster/redis01)

cd redis01、rm -f dump.rdb、vim redis.conf

1、修改端口号

 

2、打开cluster-enable前面的注释。(记得去掉前面的#)

第三步：把创建集群的ruby脚本复制到 /usr/local/redis-cluster目录下（自己建的目录）。

        cp -r redis01/ redis02

        把redis-trib.rb的ruby脚本拷贝到cluster里面（redis3.0/src）

第四步：启动6个redis实例:chmod +x startall.sh

       [cluster] vim startall.sh

       cd redis01

       ./redis-server redis.conf

       cd ..

       ......

第五步：创建集群。[cluster]

./redis-trib.rb create --replicas 1 192.168.25.153:7001 192.168.25.153:7002 192.168.25.153:7003 192.168.25.153:7004 192.168.25.153:7005  192.168.25.153:7006

[[email protected] redis-cluster]# ./redis-trib.rb create --replicas 1 192.168.25.153:7001 192.168.25.153:7002 192.168.25.153:7003 192.168.25.153:7004 192.168.25.153:7005  192.168.25.153:7006

>>> Creating cluster

Connecting to node 192.168.25.153:7001: OK

Connecting to node 192.168.25.153:7002: OK

Connecting to node 192.168.25.153:7003: OK

Connecting to node 192.168.25.153:7004: OK

Connecting to node 192.168.25.153:7005: OK

Connecting to node 192.168.25.153:7006: OK

>>> Performing hash slots allocation on 6 nodes...

Using 3 masters:

192.168.25.153:7001

192.168.25.153:7002

192.168.25.153:7003

Adding replica 192.168.25.153:7004 to 192.168.25.153:7001

Adding replica 192.168.25.153:7005 to 192.168.25.153:7002

Adding replica 192.168.25.153:7006 to 192.168.25.153:7003

M: 5a8523db7e12ca600dc82901ced06741b3010076 192.168.25.153:7001

   slots:0-5460 (5461 slots) master

M: bf6f0929044db485dea9b565bb51e0c917d20a53 192.168.25.153:7002

   slots:5461-10922 (5462 slots) master

M: c5e334dc4a53f655cb98fa3c3bdef8a808a693ca 192.168.25.153:7003

   slots:10923-16383 (5461 slots) master

S: 2a61b87b49e5b1c84092918fa2467dd70fec115f 192.168.25.153:7004

   replicates 5a8523db7e12ca600dc82901ced06741b3010076

S: 14848b8c813766387cfd77229bd2d1ffd6ac8d65 192.168.25.153:7005

   replicates bf6f0929044db485dea9b565bb51e0c917d20a53

S: 3192cbe437fe67bbde9062f59d5a77dabcd0d632 192.168.25.153:7006

   replicates c5e334dc4a53f655cb98fa3c3bdef8a808a693ca

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 192.168.25.153:7001)

M: 5a8523db7e12ca600dc82901ced06741b3010076 192.168.25.153:7001

   slots:0-5460 (5461 slots) master

M: bf6f0929044db485dea9b565bb51e0c917d20a53 192.168.25.153:7002

   slots:5461-10922 (5462 slots) master

M: c5e334dc4a53f655cb98fa3c3bdef8a808a693ca 192.168.25.153:7003

   slots:10923-16383 (5461 slots) master

M: 2a61b87b49e5b1c84092918fa2467dd70fec115f 192.168.25.153:7004

   slots: (0 slots) master

   replicates 5a8523db7e12ca600dc82901ced06741b3010076

M: 14848b8c813766387cfd77229bd2d1ffd6ac8d65 192.168.25.153:7005

   slots: (0 slots) master

   replicates bf6f0929044db485dea9b565bb51e0c917d20a53

M: 3192cbe437fe67bbde9062f59d5a77dabcd0d632 192.168.25.153:7006

   slots: (0 slots) master

   replicates c5e334dc4a53f655cb98fa3c3bdef8a808a693ca

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

[[email protected] redis-cluster]# 

 测试集群

[[email protected] redis-cluster]# redis01/redis-cli -h 192.168.25.153 -p 7002 -c

关闭redis

单个：原状态为客户端(usr/local/redis/bin/redis-cli) shutdown

多个：

     1、 [redis]# bin/redis-cli -p 7001 shutdown  这样关？

     2、[cluster]# vim shutdown.sh

         redis01/redis-cli -p 7001 shutdown

  　　redis01/redis-cli -p 7002 shutdown

　　[cluster]# chmod +x shutdown.sh      \    ./shutdown.sh