Redis configuration file parameter description

Never stop 2020-11-07 18:55:39
redis configuration file parameter description


# Redis configuration file example

# Note on units: when memory size is needed, it is possible to specifiy
# 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.

# By default Redis does not run as a daemon. Use 'yes' if you need it.
# Note that Redis will write a pid file in /var/run/redis.pid when daemonized.
daemonize yes

# When running daemonized, Redis writes a pid file in /var/run/redis.pid by
# default. You can specify a custom pid file location here.
pidfile /usr/local/redis/run/redis.pid

# Accept connections on the specified port, default is 6379
port 6379

# If you want you can bind a single interface, if the bind option is not
# specified all the interfaces will listen for incoming connections.
#
#bind 192.168.20.12

# Close the connection after a client is idle for N seconds (0 to disable)
timeout 300

# Set server verbosity to 'debug'
# it 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)
# warning (only very important / critical messages are logged)
loglevel verbose

# Specify the log file name. Also 'stdout' can be used to force
# Redis to log on the standard output. Note that if you use standard
# output for logging but daemonize, logs will be sent to /dev/null
#logfile stdout
logfile ./logs/redis.log

# Set the number of databases. The default database is DB 0, you can select
# a different one on a per-connection basis using SELECT <dbid> where
# dbid is a number between 0 and 'databases'-1
databases 16

################################ SNAPSHOTTING #################################
#
# Save the DB on disk:
#
# save <seconds> <changes>
#
# Will save the DB if both the given number of seconds and the given
# number of write operations against the DB occurred.
#
# In the example below the behaviour will be to save:
# after 900 sec (15 min) if at least 1 key changed
# after 300 sec (5 min) if at least 10 keys changed
# after 60 sec if at least 10000 keys changed
#
# Note: you can disable saving at all commenting all the "save" lines.
save 900 1
save 300 10
save 60 10000

# Compress string objects using LZF when dump .rdb databases?
# For default that's set to 'yes' as it's almost always a win.
# If you want to save some CPU in the saving child set it to 'no' but
# the dataset will likely be bigger if you have compressible values or keys.
rdbcompression yes

# The filename where to dump the DB
dbfilename dump.rdb

# The working directory.
#
# The DB will be written inside this directory, with the filename specified
# above using the 'dbfilename' configuration directive.
#
# Also the Append Only File will be created inside this directory.
#
# Note that you must specify a directory here, not a file name.
dir ./data/

################################# REPLICATION #################################

# Master-Slave replication. Use slaveof to make a Redis instance a copy of
# another Redis server. Note that the configuration is local to the slave
# so for example it is possible to configure the slave to save the DB with a
# different interval, or to listen to another port, and so on.
#
# slaveof <masterip> <masterport>

# If the master is password protected (using the "requirepass" configuration
# directive below) it is possible to tell the slave to authenticate before
# starting the replication synchronization process, otherwise the master will
# refuse the slave request.
#
# masterauth <master-password>

################################## SECURITY ###################################

# Require clients to issue AUTH <PASSWORD> before processing any other
# commands. This might be useful in environments in which you do not trust
# others with access to the host running redis-server.
#
# This should stay commented out for backward compatibility and because most
# people do not need auth (e.g. they run their own servers).
#
# Warning: since Redis is pretty fast an outside user can try up to
# 150k passwords per second against a good box. This means that you should
# use a very strong password otherwise it will be very easy to break.
#
# requirepass foobared

################################### LIMITS ####################################

# Set the max number of connected clients at the same time. By default there
# is no limit, and it's up to the number of file descriptors the Redis process
# is able to open. The special value '0' means no limits.
# Once the limit is reached Redis will close all the new connections sending
# an error 'max number of clients reached'.
#
# maxclients 128

# Don't use more memory than the specified amount of bytes.
# When the memory limit is reached Redis will try to remove keys with an
# EXPIRE set. It will try to start freeing keys that are going to expire
# in little time and preserve keys with a longer time to live.
# Redis will also try to remove objects from free lists if possible.
#
# If all this fails, Redis will start to reply with errors to commands
# that will use more memory, like SET, LPUSH, and so on, and will continue
# to reply to most read-only commands like GET.
#
# WARNING: maxmemory can be a good idea mainly if you want to use Redis as a
# 'state' server or cache, not as a real DB. When Redis is used as a real
# database the memory usage will grow over the weeks, it will be obvious if
# it is going to use too much memory in the long run, and you'll have the time
# to upgrade. With maxmemory after the limit is reached you'll start to get
# errors for write operations, and this may even lead to DB inconsistency.
#
# maxmemory <bytes>

############################## APPEND ONLY MODE ###############################

# By default Redis asynchronously dumps the dataset on disk. If you can live
# with the idea that the latest records will be lost if something like a crash
# happens this is the preferred way to run Redis. If instead you care a lot
# about your data and don't want to that a single record can get lost you should
# enable the append only mode: when this mode is enabled Redis will append
# every write operation received in the file appendonly.aof. This file will
# be read on startup in order to rebuild the full dataset in memory.
#
# Note that you can have both the async dumps and the append only file if you
# like (you have to comment the "save" statements above to disable the dumps).
# Still if append only mode is enabled Redis will load the data from the
# log file at startup ignoring the dump.rdb file.
#
# IMPORTANT: Check the BGREWRITEAOF to check how to rewrite the append
# log file in background when it gets too big.
appendonly yes

# The name of the append only file (default: "appendonly.aof")
appendfilename appendonly.aof

# The fsync() call tells the Operating System to actually write data on disk
# instead to wait for more data in the output buffer. Some OS will really flush
# data on disk, some other OS will just try to do it ASAP.
#
# Redis supports three different modes:
#
# no: don't fsync, just let the OS flush the data when it wants. Faster.
# always: fsync after every write to the append only log . Slow, Safest.
# everysec: fsync only if one second passed since the last fsync. Compromise.
#
# The default is "everysec" that's usually the right compromise between
# speed and data safety. It's up to you to understand if you can relax this to
# "no" that will will let the operating system flush the output buffer when
# it wants, for better performances (but if you can live with the idea of
# some data loss consider the default persistence mode that's snapshotting),
# or on the contrary, use "always" that's very slow but a bit safer than
# everysec.
#
# If unsure, use "everysec".

# appendfsync always
appendfsync everysec
# appendfsync no

################################ VIRTUAL MEMORY ###############################

# Virtual Memory allows Redis to work with datasets bigger than the actual
# amount of RAM needed to hold the whole dataset in memory.
# In order to do so very used keys are taken in memory while the other keys
# are swapped into a swap file, similarly to what operating systems do
# with memory pages.
#
# To enable VM just set 'vm-enabled' to yes, and set the following three
# VM parameters accordingly to your needs.
vm-enabled no
# vm-enabled yes

# This is the path of the Redis swap file. As you can guess, swap files
# can't be shared by different Redis instances, so make sure to use a swap
# file for every redis process you are running. Redis will complain if the
# swap file is already in use.
#
# The best kind of storage for the Redis swap file (that's accessed at random)
# is a Solid State Disk (SSD).
#
# *** WARNING *** if you are using a shared hosting the default of putting
# the swap file under /tmp is not secure. Create a dir with access granted
# only to Redis user and configure Redis to create the swap file there.
vm-swap-file /tmp/redis.swap

# vm-max-memory configures the VM to use at max the specified amount of
# RAM. Everything that deos not fit will be swapped on disk *if* possible, that
# is, if there is still enough contiguous space in the swap file.
#
# With vm-max-memory 0 the system will swap everything it can. Not a good
# default, just specify the max amount of RAM you can in bytes, but it's
# better to leave some margin. For instance specify an amount of RAM
# that's more or less between 60 and 80% of your free RAM.
vm-max-memory 0

# Redis swap files is split into pages. An object can be saved using multiple
# contiguous pages, but pages can't be shared between different objects.
# So if your page is too big, small objects swapped out on disk will waste
# a lot of space. If you page is too small, there is less space in the swap
# file (assuming you configured the same number of total swap file pages).
#
# If you use a lot of small objects, use a page size of 64 or 32 bytes.
# If you use a lot of big objects, use a bigger page size.
# If unsure, use the default :)
vm-page-size 32

# Number of total memory pages in the swap file.
# Given that the page table (a bitmap of free/used pages) is taken in memory,
# every 8 pages on disk will consume 1 byte of RAM.
#
# The total swap size is vm-page-size * vm-pages
#
# With the default of 32-bytes memory pages and 134217728 pages Redis will
# use a 4 GB swap file, that will use 16 MB of RAM for the page table.
#
# It's better to use the smallest acceptable value for your application,
# but the default is large in order to work in most conditions.
vm-pages 134217728

# Max number of VM I/O threads running at the same time.
# This threads are used to read/write data from/to swap file, since they
# also encode and decode objects from disk to memory or the reverse, a bigger
# number of threads can help with big objects even if they can't help with
# I/O itself as the physical device may not be able to couple with many
# reads/writes operations at the same time.
#
# The special value of 0 turn off threaded I/O and enables the blocking
# Virtual Memory implementation.
vm-max-threads 4

############################### ADVANCED CONFIG ###############################

# Glue small output buffers together in order to send small replies in a
# single TCP packet. Uses a bit more CPU but most of the times it is a win
# in terms of number of queries per second. Use 'yes' if unsure.
glueoutputbuf yes

# Hashes are encoded in a special way (much more memory efficient) when they
# have at max a given numer of elements, and the biggest element does not
# exceed a given threshold. You can configure this limits with the following
# configuration directives.
hash-max-zipmap-entries 64
hash-max-zipmap-value 512

# Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in
# order to help rehashing the main Redis hash table (the one mapping top-level
# keys to values). The hash table implementation redis uses (see dict.c)
# performs a lazy rehashing: the more operation you run into an hash table
# that is rhashing, the more rehashing "steps" are performed, so if the
# server is idle the rehashing is never complete and some more memory is used
# by the hash table.
#
# The default is to use this millisecond 10 times every second in order to
# active rehashing the main dictionaries, freeing memory when possible.
#
# If unsure:
# use "activerehashing no" if you have hard latency requirements and it is
# not a good thing in your environment that Redis can reply form time to time
# to queries with 2 milliseconds delay.
#
# use "activerehashing yes" if you don't have such hard requirements but
# want to free memory asap when possible.
activerehashing yes

################################## INCLUDES ###################################

# Include one or more other config files here. This is useful if you
# have a standard template that goes to all redis server but also need
# to customize a few per-server settings. Include files can include
# other files, so use this wisely.
#
# include /path/to/local.conf
# include /path/to/other.conf

Configuration file parameter description

 

1. Redis The default is not to run as a daemon , This configuration item can be modified , Use yes Enable daemons

    daemonize no

2. When Redis Run as a daemon ,Redis By default the pid write in /var/run/redis.pid file , Can pass pidfile Appoint

    pidfile /var/run/redis.pid

3. Appoint Redis Listening port , The default port is 6379, In one of his blog posts, the author explains why 6379 As default port , because 6379 On the phone buttons MERZ The corresponding number , and MERZ From the Italian singer Alessia Merz Name

    port 6379

4. The bound host address

    bind 127.0.0.1

5. When How long does the client sit idle before closing the connection , If specified as 0, Indicates that the feature is turned off

    timeout 300

6. Specifies the logging level ,Redis There are four levels supported :debug、verbose、notice、warning, The default is verbose

    loglevel verbose

7. Logging mode , The default is standard output , If configured Redis Run for daemon mode , This is configured for logging as standard output , The log will be sent to /dev/null

    logfile stdout

8. Set the number of databases , The default database is 0, have access to SELECT <dbid> The command specifies the database on the connection id

    databases 16

9. Specify how long , How many update operations are there , Synchronize the data to the data file , Multiple conditions can be used

    save <seconds> <changes>

    Redis Three conditions are provided in the default configuration file :

    save 900 1

    save 300 10

    save 60 10000

    respectively 900 second (15 minute ) There are 1 A change ,300 second (5 minute ) There are 10 Changes and 60 In seconds 10000 A change .

 

10. Specifies whether data is compressed when stored to a local database , The default is yes,Redis use LZF Compress , If in order to save money CPU Time , This option can be turned off , But it can make the database files huge

    rdbcompression yes

11. Specifies the local database file name , The default value is dump.rdb

    dbfilename dump.rdb

12. Specifies the local database hosting directory

    dir ./

13. Set when the native is slav The service , Set up master Service IP Address and port , stay Redis Startup time , It will automatically follow master Data synchronization

    slaveof <masterip> <masterport>

14. When master When the service is password protected ,slav Service connection master Password

    masterauth <master-password>

15. Set up Redis Connect the password , If the connection password is configured , The client is connecting Redis Need to go through AUTH <password> Command provide password , Off by default

    requirepass foobared

16. Sets the maximum number of client connections at one time , Default limit ,Redis The number of client connections that can be opened simultaneously is Redis The maximum number of file descriptors that a process can open , If you set maxclients 0, No restrictions . When the number of client connections reaches the limit ,Redis The new connection is closed and returned to the client max number of clients reached error message

    maxclients 128

17. Appoint Redis Maximum memory limit ,Redis Data is loaded into memory at startup , After reaching the maximum memory ,Redis It will first try to clear those that are due or are about to expire Key, When this method is handled after , Still reaches the maximum memory setting , Will no longer be able to write , But you can still do a read .Redis new vm Mechanism , Will be able to Key Storage memory ,Value Will be stored in a swap District

    maxmemory <bytes>

18. Specifies whether to log after each update operation ,Redis By default, data is written asynchronously to disk , If you don't turn it on , Data may be lost for a period of time during a power outage . because redis The itself synchronization data file is pressed above save Condition to synchronize , So some data will only exist in memory for a while . The default is no

    appendonly no

19. Specifies the file name of the update log , The default is appendonly.aof

     appendfilename appendonly.aof

20. Specifies an update log condition , share 3 Optional values : 
    no: Means that the operating system synchronizes the data cache to disk ( fast ) 
    always: Represents a manual call after each update operation fsync() Write data to disk ( slow , Security ) 
    everysec: That means once per second ( compromise , The default value is )

    appendfsync everysec

 

21. Specifies whether the virtual memory mechanism is enabled , The default value is no, A brief introduction ,VM The mechanism stores data in pages , from Redis Cold data for less visited pages swap To disk , Pages with multiple accesses are automatically swapped out from disk to memory ( I will analyze it carefully in the following articles Redis Of VM Mechanism )

     vm-enabled no

22. Virtual memory file path , The default value is /tmp/redis.swap, Not more than one Redis The instance Shared

     vm-swap-file /tmp/redis.swap

23. I'm going to make everything greater than vm-max-memory Is stored in virtual memory , No matter what vm-max-memory Set up small , All index data is stored in memory (Redis Index data of Namely keys), in other words , When vm-max-memory Set to 0 When , It's all value Both exist on disk . The default value is 0

     vm-max-memory 0

24. Redis swap The file is divided into many parts page, An object can be stored in more than one page above , But a page Can't be Shared by multiple objects ,vm-page-size It's based on storage The data size is set , The authors suggest storing many small objects ,page The size is best set to 32 perhaps 64bytes; If you store large objects , You can use a larger one page, If you don't determine , Just use the default values

     vm-page-size 32

25. Set up swap In the document page Number , Because the page table ( One that indicates that a page is free or in use bitmap) It's in memory ,, Each on disk 8 individual pages Will consume 1byte Of memory .

     vm-pages 134217728

26. Set access swap Number of threads in the file , It is best not to exceed the audit of the machine , If set to 0, So all right swap The operation of the file is serial , May cause a relatively long delay . The default value is 4

     vm-max-threads 4

27. Set when to reply to the client , Whether to combine smaller packages into a single package , On by default

    glueoutputbuf yes

28. Specifies when a certain number or maximum of elements exceeds a certain threshold , A special hash algorithm is used

    hash-max-zipmap-entries 64

    hash-max-zipmap-value 512

29. Specifies whether to activate the reset hash , On by default ( In the introduction Redis The hash algorithm is introduced in detail )

    activerehashing yes

30. Specifies that additional configuration files are included , More than one can be on the same host Redis The same configuration file is used between instances , At the same time, each instance has its own specific configuration file

    include /path/to/local.conf

 

 

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