Redis configuration Redis master-slave replication

Read Catalogue

• Simple Introduction
• Chapter 1: Download and install
• Section 2: Modifying a configuration file
• Chapter 3: Enabling the master-slave Redis Service
• Chapter 4: Client Connection-Test synchronization
• Chapter 5: Application Scenarios
• Chapter 6: Reference links

Simple IntroductionThe role of Redis, can be self-search online, the following will introduce Redis master-slave replication. Configure Redis master-slave IP and port:

Master and slave	Ip	Port
Master	127.0.0.1	6379
Slave1	127.0.0.1	6380
Slave2	127.0.0.1	6381

Back to TopFirst, download the installation

• Download file:
  

 
   
  

  
    
   
wget http://download.redis.io/releases/redis-3.2.1.tar.gz
 
   
  

• Unzip:
  

  
 

   
  

  
tar zxvf redis-3.2.1.tar.gz
   
  

  
mv redis-3.2.1 redis-3.2.1.master
   
  

  
tar zxvf redis-3.2.1.tar.gz
   
  

  
mv redis-3.2.1 redis-3.2.1.slave-1
   
  

  
tar zxvf redis-3.2.1.tar.gz
   
  

  
mv redis-3.2.1 redis-3.2.1.slave-2
  
 

• Execute make and make test

Enter the folder separately:Redis-3.2.1.master,Redis-3.2.1.slave-1 andRedis-3.2.1.slave src directory, execute command:

  
    
 

   
     
  
cd redis-3.2.1.master/src
   
     
  
make 
   
     
  
make test
   
     
  
//其他两个目录执行相同的操作
  
    
 

After successful execution, you will be prompted:
Back to TopSecond, modify the configuration file: redis.confThe configuration file is located at: (3 configuration files need to be modified)
Main changes 4 parameters:

1. Port
2. LogFile
3. slaveof;
4. Pidfile;
5. Daemonize (configuration runs in daemon mode)
   

• To modify the Master file: redis.conf:
  

Do not change other parts of the configuration file, modify the following:

 
   
  

  
    
   
port 6379
  
    
   
pidfile /var/run/redis_6379.pid
  
    
   
# slaveof <masterip> <masterport>
  
    
   
logfile "/data/logs/redis.master.log"
  
    
   
daemonize yes

 
   
  

• To modify the slave1 configuration file:
  

 
   
  
 
    
   
< Span class= "PLN" >port 6380   
 
    
   
< Span class= "PLN" >pidfile / var  / run  / redis_6380   pid   
 
    
   
slaveof  127.0   0.1    6379   
 
    
   
< Span class= "PLN" >logfile  "/data/logs/redis.slave1.log"   
 
    
   
daemonize Yes 
   
 
   
  
 

• 
  

 
   
  
 
    
   
< Span class= "PLN" >port 6381   
 
    
   
< Span class= "PLN" >pidfile / var  / run  / redis_6381   pid   
 
    
   
slaveof  127.0   0.1    6379   
 
    
   
< Span class= "PLN" >logfile  "/data/logs/redis.slave-6381.log"   
 
    
   
daemonize Yes 
   
 
   
  
 

Back to TopThird, open master and slave1, Slave2

• Turn on master (Salve is turned on like this)

Go to directory: redis-3.2.1.master (slave then go to the appropriate directory), execute:

 
   
  

  
    
   
./src/redis-server redis.conf
 
   
  

After successful operation, view logfile can see the following interface:

• Open slave1
  

You can see the slave1 turned on, such as:also see the log for master as follows:

• Open Slave2
  

You can see the slave2 turned on, such as:
Also see the log for master as follows:

• View the running situation
  

Back to TopIv. Client Connection-Test synchronization

• Connect the master client and create the data
  

 
   
  

  
    
   
redis-cli -h 127.0.0.1 -p 6379
 
   
  

• Connect the slave and view the data synchronization situation:
  

Here's another slave:
Slave can not write, only can read when the slave of Redis, can only read data, can not write data:

Back to Topv. Application Scenarios

• Operations that take the latest n data

For example, the most recent article to get your site, through the following way, we can put the latest 5,000 reviews of the ID in the Redis list collection, and will be out of the collection section from the database to obtain the use of the Lpush latest.comments<id> command, Insert data into the list collection after inserting it, then use the LTrim latest.comments 0 5000 command to keep the last 5,000 IDs forever and then we can use the following logic when we get a page comment on the client (pseudo code)

  
 

   
  

  
FUNCTION get_latest_comments(start,num_items):
   
  

  
   id_list = redis.lrange("latest.comments",start,start+num_items-1)
   
  

  
   IF id_list.length < num_items
   
  

  
   id_list = SQL_DB("SELECT ... ORDER BY time LIMIT ...")
   
  

  
   END
   
  

  
RETURN id_list
   
  

  
END
  
 

If you have a different filter dimension, such as the newest n for a category, you can build a list that is categorized by this category, and Redis is very efficient if you save the ID .

• Leaderboard application, Top n operation

This requirement differs from the above requirements in that the preceding operation takes the time as the weight, this is the weight of a certain condition, such as the number of times by the top, then we need our sorted set to go, set the value you want to sort into the score of sorted set, Set the specific data to the corresponding value, each time only need to execute a zadd command.

• Applications that require precise setting of expiration time

For example, you can set the score value of the sorted set to the timestamp of the expiration time, then you can simply sort through the expiration time, and periodically purge out-of-date data, not only to clear the expired data in Redis, You can think of this expiration time in Redis as an index to the data in the database, use Redis to find out what data needs to be deleted, and then delete the corresponding records from the database exactly.

• Counter Application

Redis commands are atomic, and you can easily use the INCR,DECR command to build a counter system.

• Uniq operation, get all data row weight values for a certain period of time

This is the most appropriate set data structure to use Redis, just to constantly throw it into set, set means set, so it automatically takes weight.

• Pub/sub Building a real-time messaging system

Redis's pub/sub system can build real-time messaging systems, such as many examples of real-time chat systems built with Pub/sub.

• Building a queue system

Using list, you can build a queue system, and you can even build a prioritized queue system using sorted set.

• Cache

Back to TopVi. Reference Links"Configuring Redis High Availability" http://www.veritas.com/community/blogs/configuring-redis-high-availability " Redis Sentinel Deployment under Windows http://bbs.redis.cn/forum.php?mod=viewthread&tid=715




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Redis configuration Redis master-slave replication