Redis design specification

Key Design specifications for

Java Object storage scheme

Redis Safety suggestion

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

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

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

• 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

• Regular backup  save/bgsave command   Conduct RDB Backup

• 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

• volatile-lru： Delete the least recently used key

• volatile-lfu： Delete the least frequently used key

• volatile-ttl： In chronological order , Delete expiring key

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

• allkeys-lru:  Delete the least recently used key

• allkeys-lfu:  Delete the least frequently used key

• allkeys-random:  Randomly delete all data key

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