REDIS00_ Explain redis Conf configuration file

①. Units - Company

• Units: Company ,Redis The units in the configuration file are case insensitive
  Units are case insensitive , therefore 1GB 1Gb 1gB It's all the same

# Redis configuration file example

# Note on units: when memory size is needed, it is possible to specify
# it in the usual form of 1k 5GB 4M and so forth:
#
# 1k => 1000 bytes
# 1kb => 1024 bytes
# 1m => 1000000 bytes
# 1mb => 1024*1024 bytes
# 1g => 1000000000 bytes
# 1gb => 1024*1024*1024 bytes
#
# units are case insensitive so 1GB 1Gb 1gB are all the same.
# [ translate ] Units are case insensitive , therefore 1GB 1Gb 1gB It's all the same .

②. includes - Include

• includes: contain , Can be in Redis Load some more at startup except Redis.conf Configuration files other than , and Spring Of import,jsp Of include similar

################################## INCLUDES # Include one or more other config files here. This is useful if you
# have a standard template that goes to all Redis servers but also need
# to customize a few per-server settings. Include files can include
# other files, so use this wisely.
#
# Notice option "include" won't be rewritten by command "CONFIG REWRITE"
# from admin or Redis Sentinel. Since Redis always uses the last processed
# line as value of a configuration directive, you'd better put includes
# at the beginning of this file to avoid overwriting config change at runtime.
#
# If instead you are interested in using includes to override configuration
# options, it is better to use include as the last line.
#
# include .\path\to\local.conf
# include c:\path\to\other.conf

③. NETWORK - The Internet

• ①. bind: The Internet , Express Redis The port opened at startup is bound to the local machine by default

• ②. protected-mode:yes Whether to turn on the protection mode ,Redis Default on , If not set bind Of IP Address and Redis password , Then the service can only run locally by default

################################## NETWORK #####################################

# By default, ...
#
# Examples:
#
# bind 192.168.1.100 10.0.0.1
# bind 127.0.0.1 ::1
#
# ~~~ WARNING ~~~ ...
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# [ effect ] The Internet , Express Redis The port opened at startup is bound to the local machine by default 
bind 127.0.0.1

# Protected mode is a layer of security protection, in order to avoid that
# ...
# [ effect ] Whether to turn on the protection mode ,Redis Default on , If not set bind Of IP Address and Redis password , Then the service can only run locally by default 
protected-mode yes

# [ translate ] Accept connections on the specified port , The default is 6379 (IANA #815344).
# [ translate ] If the port 0 To be designated ,Redis Will not monitor TCP Socket .
# [ effect ]Redis Specify listening port , The default is 6379
port 6379

# ...

# [ effect ] Indicates how long the server has been idle ( second ) Closed after , If this value is 0, Indicates that this function does not work 
timeout 0

④. GENERAL - The guardian thread

• daemonize yes: Run as a daemon , The default is no, We need to turn it on ourselves yes

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. SNAPSHOTTING - Persistence

• ①. Chinese translation for snapshot , If within the prescribed time , The data has been updated several times , Then the data will be synchronized and backed up to a file

• ②. Redis There are two ways to persist , One is RDB, One is AOF.SNAPSHOTTING The main aim is Redis In persistence RDB

• ③. Redis It's a memory database , If you do not use persistence to save data , The embarrassing scene of power failure will appear

################################ SNAPSHOTTING ################################
# ...
#  stay 900 Seconds , At least one key Be modified ( add to ), The persistence operation will take place 
save 900 1
#  stay 300 Seconds , There are at least 10 individual key Be modified , The persistence operation will take place 
save 300 10
#  stay 60 Seconds , There are at least 1 m key Be modified , The persistence operation will take place 
save 60 10000

#  If Redis An error occurred during persistence , Whether to stop writing , The default is 
top-writes-on-bgsave-error yes

# Whether to compress persistent files during data backup , The default is , This operation will cost CPU resources , It can be set to no
rdbcompression yes

#  While saving the persistent file , Perform data verification on the contents of the file 
rdbchecksum yes

#  Directory where persistent files are saved , It is saved in the current directory by default 
dir ./

⑥. REPLICATION - Master slave copy

#  Copy data on the host , Specified by the current configuration IP And port number is the host 
################################# REPLICATION #################################
# Redis Comment this configuration in the configuration file , Default not to use , The same below 
# replicaof <masterip> <masterport>

#  If the configured host has a password , This password needs to be configured to pass master Validation of the 
# masterauth <master-password>

⑦. SECURITY - password

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 Password 
OK
127.0.0.1:6379> config get requirepass #  I found that all commands have no permission 
(error) NOAUTH Authentication required.
127.0.0.1:6379> ping
(error) NOAUTH Authentication required.
127.0.0.1:6379> auth 123456 #  Log in with a password !
OK
127.0.0.1:6379> config get requirepass
1) "requirepass"
2) "123456"

⑧. CLIENT - client

• volatile-lru： Only for key Conduct LRU( The default value is )
  allkeys-lru: Delete lru Algorithm key
  volatile-random： Random delete is about to expire key
  allkeys-random： Random delete
  volatile-ttl: Delete expiring
  noeviction: Never expire , Returns an error

# Redis Maximum number of clients allowed , There are 10000 by default 
################################### CLIENTS ####################################
# Redis Maximum number of clients allowed , There are 10000 by default 
# maxclients 10000
############################## MEMORY MANAGEMENT ################################
# Redis Configure maximum memory capacity 
# maxmemory <bytes>

#  The default processing policy after the memory reaches the maximum 
# maxmemory-policy noeviction

⑨. APPEND - Persistence

• ①. This is a Redis Another way to persist ,AOF,AOF Mode is not enabled by default ,Redis By default, the persistence mode is enabled RDB, In most cases ,RDB Our model is fully adequate

appendonly no
# AOF Persistent file name 
appendfilename "appendonly.aof"
#  Synchronize once per second , But this second of data may be lost 
#  about  appendfsync  It has the following properties  
# appendfsync always  It means that data synchronization will be performed for each modification , Slower , Consumption performance 
# appendfsync no  Do not perform synchronization , No performance consumption 
appendfsync everysec #  Data out of sync , Once per second