Redis design specification

Key Design specifications for

Java Object storage scheme

Redis Safety suggestion

1. Redis Don't be accessed by the Internet , prohibit bind 0.0.0.0 It should be set to bind 192.168.132.128

2. change redis The default port of is not 6379, It can be set to others, such as -port 6677

3. Redis Use non Root start-up , Do not use root, It can be for redis Create a special account for redis Conduct management .

4. Redis To set the password （ Login password and master-slave synchronization password , It is recommended to mix uppercase and lowercase letters with characters in passwords , Improve security ）, Don't use the same login password

5. Regular backup save/bgsave command Conduct RDB Backup

6. Good configuration Linux Firewall rules , Release the minimum range of ports

Redis Memory usage evaluation

Occupied memory is divided into ： Self memory , Buffer memory , Object memory

Self memory

redis The process is used to run and maintain the developed space memory .

Buffer memory

Client buffer ： For example, the commands entered by the client are stored in the client buffer on the server .

Copy buffer ：redis A piece of memory will be opened up for data exchange , Improve the speed of data exchange .

AOF buffer ： be used for AOF journal , because AOF It's not just a command to write once AOF Log files , Instead, it is stored in AOF buffer , Reach a certain amount , Write to the log file together .

Object memory

The area where data is actually stored .

Redis Memory statistics

Redis Set upper memory limit

Redis Memory recovery strategy

1. volatile-lru： Delete the least recently used key

2. volatile-lfu： Delete the least frequently used key

3. volatile-ttl： In chronological order , Delete expiring key

4. volatile-random： Randomly delete data that is about to expire key

5. allkeys-lru: Delete the least recently used key

6. allkeys-lfu: Delete the least frequently used key

7. allkeys-random: Randomly delete all data key

8. noeviction: Never expire , If there is a request to add , Returns an error