Redis High Availability: Master-slave replication

Source: Internet
Author: User
Tags auth bind redis iptables redis server

Centos 6.4 installs Redis 3.2. (Installation reference: Redis source installation)


Centos222

Centos224

[centos222]# REDIS-CLI

127.0.0.1:6379>set KK 123

127.0.0.1:6379>get KK

"123"

127.0.0.1:6379>get mm

(nil)

127.0.0.1:6379>exit

[centos224]# REDIS-CLI

127.0.0.1:6379>set KK 123

127.0.0.1:6379>get mm

"22222"

127.0.0.1:6379>get KK

(nil)

127.0.0.1:6379>exit

next requires remote Access, config file set LAN IP, turn off protected mode

Vi/etc/redis/6379.conf

Bind 127.0.0.1 192.168.1.222

Protected-mode No

Bind 127.0.0.1 192.168.1.224

Protected-mode No

Restart the Redis service and add the add-on port to access each other's Redis server.

[centos222]# iptables-i input-p TCP--dport 6379-j ACCEPT

[centos222]# redis-cli-h 192.168.1.224-p 6379

192.168.1.224:6379> get mm

"22222"

[centos222]# iptables-i input-p TCP--dport 6379-j ACCEPT

[centos224]# redis-cli-h 192.168.1.222-p 6379

192.168.1.222:6379> Get KK

"123"

access no password, not secure, now set the system password parameter requirepass

(Take centos222 as an example, both servers need to be set up)

127.0.0.1:6379> config get Requirepass #查看参数信息

1) "Requirepass"

2) ""

127.0.0.1:6379> config set requirepass 123456 #设置参数 (password) value

Ok

127.0.0.1:6379> config get Requirepass #设置密码后无法操作

(Error) Noauth Authentication required.

127.0.0.1:6379> Auth 123456 #使用密码访问

Ok

127.0.0.1:6379> Get KK

"123"

127.0.0.1:6379> exit

[centos222]# redis-cli-h 192.168.1.224-p 6379-a 123456 #远程访问

192.168.1.224:6379> get mm

"22222"

192.168.1.224:6379>

However, when the Redis service restarts, the Requirepass password is invalidated and the null value is changed back

to permanently take effect, add this parameter to the configuration file:vi/etc/redis/6379.conf

Requirepass 123456

start Configuring Master-slave replication. Very simple. The configuration parameter slaveof is used primarily .

Vi/etc/redis/6379.conf

Centos222 (Master)

Centos224 (slave)

Bind 127.0.0.1 192.168.1.222

Protected-mode No

Port 6379

Requirepass 654321

Bind 127.0.0.1 192.168.1.224

Protected-mode No

Port 6379

Requirepass 654321

Slaveof 192.168.1.222 6379

Masterauth 654321

Slave-read-only Yes

configuration complete, restart the service. Found in the master set key, the slave can be read (slave read only). Master-Slave configuration is complete.

[Root@centos222 ~]# Redis-cli

127.0.0.1:6379> Auth 654321

Ok

127.0.0.1:6379> Set QQ 6666666

Ok

127.0.0.1:6379> get QQ

"6666666"

127.0.0.1:6379>

[root@centos224 ~]# Redis-cli

127.0.0.1:6379> Auth 654321

Ok

127.0.0.1:6379> get QQ

"6666666"

127.0.0.1:6379>

127.0.0.1:6379> Set pp 444

(Error) READONLY you can ' t write against a read only slave.

Info Replication View replication configuration information

127.0.0.1:6379> Info Replication

# Replication

Role:master

Connected_slaves:1

Slave0:ip=192.168.1.224,port=6379,state=online,offset=392,lag=0

master_repl_offset:392

Repl_backlog_active:1

repl_backlog_size:1048576

Repl_backlog_first_byte_offset:2

repl_backlog_histlen:391

127.0.0.1:6379> Info Replication

# Replication

Role:slave

master_host:192.168.1.222

master_port:6379

Master_link_status:up

Master_last_io_seconds_ago:3

master_sync_in_progress:0

slave_repl_offset:420

slave_priority:100

Slave_read_only:1

connected_slaves:0

master_repl_offset:0

repl_backlog_active:0

repl_backlog_size:1048576

repl_backlog_first_byte_offset:0

repl_backlog_histlen:0


Two more theoretical posts: Redis persistent rdb and aof Redis persistence

Security and vulnerability: Redis Crackit intrusion Event Analysis



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