Deploy redis with docker for high availability master-slave replication

---

Preface

Why do I need master-slave replication ？

In high concurrency , High availability has become the mainstream today . If there is only one middleware , failure , So easy to cause a single point of failure . Make the service unavailable . Or the middleware is under storage , How to continue to store information has become one of the problems that need to be solved , Then data backup becomes the basic method to solve this problem .

---

One 、 What is master-slave replication ？

Procedure to redis-master Service write information , This information will be synchronized to other slave Server . In this cluster ,masterd The written data of will be synchronized to slave in , and slave Can't write , Only read . This is in the subsequent sentinel mode ,slave stay master It will become new under fault master.

Two 、 step

1. Pull the mirror image

I've written on my blog before , Just bring it here

1.docker pull redis
2. because redis There is no local redis.conf file , So download one  

2. install master

I am here 1.15.233.184 Install under this server master service , No other operation is required during installation , Create mount directory , Just boot it up .

1.mkdir /data/redis/data ( You can also not mount , Look at yourself )
2. take redis.conf Put it in /data/redis Next 
3. modify redis.conf The configuration information of is as follows :
 1. take bind 127.0.0.1  Comment out , Give Way redis Can be accessed externally 
 2.protected-mode yes  Comment out 
 3.requirepass 123456  Set the password 
3. start-up :
  docker run -p 6379:6379 --name redis-master -v /data/redis/redis.conf:/etc/redis/redis.conf -v /data/redis/data:/data -d redis redis-server /etc/redis/redis.conf --appendonly yes

install slave

 This server is 139.9.186.192
 I start directly , It's not mounted 

1.docker pull redis
2.docker run -it --name redis-slave -d -p 6379:6379 redis redis-server --requirepass 123456
3.docker exec -it redis-slave redis-cli
4.auth 123456
5.slaveof 1.15.233.184 6379
6.config set masterauth 123456

1. Pull the mirror 
2. function redis-slave
3. Enter for operation redis client 
4. Input redis password 
5. As slave To connect master
6. Set up master Password 

If you want to mount , Then you can directly modify config File to start the

1.docker pull redis

2. Create mount directory /data/redis/data, A copy of redis.conf To /data/redis Next 

3. modify reids.conf Configuration of files 
	1.# bind 127.0.0.1
	2.daemonize yes
	3.requirepass 123456 #  Slave password , Optional configuration 
	4.slaveof 1.15.233.184 6379 # <masterip> Indicates the location of the main library ip, and <masterport> Indicates the port that the main library starts , The default is 6379
	5.masterauth 123456   #  If the master database has a password, it must be configured ,<master-password> Represents the access password of the main library 
	
4.docker run -it --name redis-slave -d -p 6379:6379 -v /data/redis/redis.conf:/etc/redis/redis.conf -v /data/redis/data:/data -d redis redis-server /etc/redis/redis.conf --appendonly yes

1. Pull the mirror 
2. Create mount files and directories 
3. Modify the configuration file 
4. function 

stay master Add key,slave It can also be displayed

---

summary

redis There are many other modes of clustering , What I write today is one master and one slave , There is also one master and many followers , The Lord and from much