Redis configuration file explanation

Preface

As the saying goes ： Experts have wood ！ You know it when you do it ！
The previous study is just to let us know How to use Redis , But we as developers , You have to know why , So we have to fundamentally understand , Let's take Redis.conf Study the document carefully , Improve yourself ！ Flying self ！
In practice ： Some little configuration , It can make you stand out ！

1. Company ：Redis Configuration is case insensitive ！

 2. contain ： build Redis When the cluster , have access to includes Contains other configuration files

 3. The Internet ：

  explain ：

bind 127.0.0.1 #  The binding of ip 
protected-mode yes #  Protected mode  
port 6379 #  Port settings 

4. Universal GENERAL

daemonize yes #  Run as a daemon , The default is  no, We need to turn it on ourselves yes！ 
pidfile /var/run/redis_6379.pid #  If it runs in the background mode , We need to specify one  pid  file ！ 
#  journal  
# Specify the server verbosity level. 
# This can be one of:
# debug (a lot of information, useful for development/testing) 
# verbose (many rarely useful info, but not a mess like the debug level) 
# notice (moderately verbose, what you want in production probably)  Production environment  
# warning (only very important / critical messages are logged)
loglevel notice 
logfile "" #  The file location name of the log  
databases 16 #  Number of databases , The default is  16  A database  
always-show-logo yes #  Always show LOGO

5. snapshot （RDB）： Persistence , Within the specified time , The number of operations performed will be persisted to the file .rdb .aof file

Redis Is a memory database , If there is no persistence , If the data is powered off, it will be lost ！

#  If 900s Inside , If there is at least one 1 key It's been modified , We do persistence operations  
save 900 1 
#  If 300s Inside , If at least 10 key It's been modified , We do persistence operations  
save 300 10 
#  If 60s Inside , If at least 10000 key It's been modified , We do persistence operations  
save 60 10000 
#  We'll learn about persistence later , Will define the test itself ！

6.SECURITY Security

You can set it up here Redis Password , There is no password by default .
① Set by command

127.0.0.1:6379> ping
PONG
127.0.0.1:6379> config get requirepass  # obtain Redis Password 
1) "requirepass"
2) ""
127.0.0.1:6379> config set requirepass "123456"  # Set up Redis The password for 123456
OK
# Ctrl+C  Exit the current connection 
[[email protected] bin]# redis-cli -p 6379  # Reconnect the 
127.0.0.1:6379> ping  # test ping, Failure , All commands show no permission 
(error) NOAUTH Authentication required.  
127.0.0.1:6379> set k1 v1  # Failure , All commands show no permission 
(error) NOAUTH Authentication required.  
127.0.0.1:6379> auth 123456  #auth +  password    Land on it 
OK 
127.0.0.1:6379> ping  # normal 
PONG
127.0.0.1:6379> config get requirepass  # Get password , normal 
1) "requirepass"
2) "123456"

② By modifying the configuration file settings , Find the location shown , Add password

  restart Redis test ！

127.0.0.1:6379> ping
(error) NOAUTH Authentication required.  
127.0.0.1:6379> auth 123456
OK
127.0.0.1:6379> ping
PONG

7. Limit CLIENTS

maxclients 10000   # Settings can be connected to redis The maximum number of clients  
maxmemory <bytes>  #redis  Configure maximum memory capacity  
maxmemory-policy noeviction  # The processing strategy after the memory reaches the upper limit  
1、volatile-lru： Only for key Conduct LRU（ The default value is ） 
2、allkeys-lru ：  Delete lru Algorithm key 
3、volatile-random： Random delete is about to expire key 
4、allkeys-random： Random delete  
5、volatile-ttl ：  Delete expiring  
6、noeviction ：  Never expire , Returns an error 

8.APPEND ONLY Pattern aof To configure （ Persistent save ）

appendonly no  # The default is not on aof Mode , The default is to use rdb Way persistent , In most cases ,rdb Quite enough ！ 
appendfilename "appendonly.aof"  # The name of the persistent file  
# appendfsync always #  Every time you make a change, it will  sync. Consumption performance  
appendfsync everysec #  Once a second  sync, You may lose this 1s The data of ！ 
# appendfsync no  # Don't execute  sync, At this time, the operating system synchronizes its own data , The fastest ！