Redis搭建和主从复制

一、Redis搭建

[root@k8s-master1 ~]# wget https://download.redis.io/releases/redis-6.0.10.tar.gz

[root@k8s-master1 ~]# tar xzf redis-6.0.10.tar.gz

[root@k8s-master1 ~]# mv redis-6.0 redis

root@k8s-master1 redis-6.0.10]# gcc -v

[root@k8s-master1 redis-6.0.10]# yum -y install centos-release-scl

[root@k8s-master1 redis-6.0.10]# yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils

[root@k8s-master1 redis-6.0.10]# scl enable devtoolset-9 bash

[root@k8s-master1 redis-6.0.10]# echo "source /opt/rh/devtoolset-9/enable" >>/etc/profile

[root@k8s-master1 redis-6.0.10]# make install PREFIX=/usr/local/redis

[root@k8s-master1 redis-6.0.10]#make test

[root@k8s-node1 redis]# yum install tcl

1、使用systemctl进行服务管理

[root@k8s-node1 redis]# more /usr/lib/systemd/system/redis.service

[Unit]

Description=Redis

After=network.target

[Service]

Type=forking

PIDFile=/var/run/redis_6379.pid

ExecStart=/usr/local/redis/bin/redis-server /usr/local/redis/redis.conf

ExecReload=/bin/kill -s HUP $MAINPID

ExecStop=/bin/kill -s QUIT $MAINPID

PrivateTmp=true

[Install]

WantedBy=multi-user.target

[root@k8s-node1 redis]# daemon-reload

[root@k8s-node1 redis]# systemctl start redis

[root@k8s-node1 redis]# systemctl enable redis

二、主从复制搭建步骤

192.168.210.85 redis-master

192.168.210.177 redis-slave

192.168.210.195 redis-slave

1、查询主从复制信息，分别选择三个端口，执行命令：info replication

[root@k8s-master1 bin]# ./redis-cli -h 192.168.210.85 -p 6379

192.168.210.85:6379> info replication

[root@k8s-node1 bin]# ./redis-cli -h 192.168.210.177 -p 6379

192.168.210.177:6379> info replication

[root@k8s-node3 bin]# ./redis-cli -h 192.168.210.195 -p 6379

192.168.210.195:6379> info replication

2、执行命令：set name sfqd

192.168.210.85:6379> set name sfqd

3、设置主从关系，分别在177和195服务器执行，执行命令：SLAVEOF192.168.210.85 6379

192.168.210.177:6379> slaveof 192.168.210.85 6379

192.168.210.177:6379> info replication

# Replication

role:slave

master_host:192.168.210.85

master_port:6379

master_link_status:up

master_last_io_seconds_ago:6

master_sync_in_progress:0

192.168.210.195:6379> slaveof 192.168.210.85 6379

192.168.210.195:6379> info replication

# Replication

role:slave

master_host:192.168.210.85

master_port:6379

master_link_status:up

master_last_io_seconds_ago:7

master_sync_in_progress:0

slave_repl_offset:56

slave_priority:100

slave_read_only:1

connected_slaves:0

主从关系发生了变化

4、全量复制，分别选择177和195服务器，执行命令：get name

192.168.210.177:6379> get name

"sfqd"

192.168.210.177:6379>

192.168.210.195:6379> get name

"sfqd"

192.168.210.195:6379>

都可以打印name的值，说明在建立主从关系，从机便拥有了主机的数据

5、主从的读写分离，选择177服务器，执行命令：set k1 v1

192.168.210.177:6379> set k1 v1

(error) READONLY You can't write against a read only replica.

从机177写入失败，是因为读写分离的机制

192.168.210.85:6379> set k1 v1

6、主机宕机的情况，执行命令：shutdown

192.168.210.85:6379> shutdown

not connected>

7、主机宕机后恢复

[root@k8s-master redis]# systemctl start redis

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