X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/7d8c555e92954b02d40c15702476fd48e55c4f94..2b45ef020cf30a3376d1b406b1793a554b43bdea:/redis.conf?ds=sidebyside diff --git a/redis.conf b/redis.conf index e7a01eec..97aea334 100644 --- a/redis.conf +++ b/redis.conf @@ -1,6 +1,6 @@ # Redis configuration file example -# Note on units: when memory size is needed, it is possible to specifiy +# 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 @@ -34,9 +34,10 @@ port 6379 # on a unix socket when not specified. # # unixsocket /tmp/redis.sock +# unixsocketperm 755 # Close the connection after a client is idle for N seconds (0 to disable) -timeout 300 +timeout 0 # Set server verbosity to 'debug' # it can be one of: @@ -44,7 +45,7 @@ timeout 300 # 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 +loglevel notice # 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 @@ -81,17 +82,47 @@ databases 16 # after 60 sec if at least 10000 keys changed # # Note: you can disable saving at all commenting all the "save" lines. +# +# It is also possible to remove all the previously configured save +# points by adding a save directive with a single empty string argument +# like in the following example: +# +# save "" save 900 1 save 300 10 save 60 10000 +# By default Redis will stop accepting writes if RDB snapshots are enabled +# (at least one save point) and the latest background save failed. +# This will make the user aware (in an hard way) that data is not persisting +# on disk properly, otherwise chances are that no one will notice and some +# distater will happen. +# +# If the background saving process will start working again Redis will +# automatically allow writes again. +# +# However if you have setup your proper monitoring of the Redis server +# and persistence, you may want to disable this feature so that Redis will +# continue to work as usually even if there are problems with disk, +# permissions, and so forth. +stop-writes-on-bgsave-error yes + # 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 +# Since verison 5 of RDB a CRC64 checksum is placed at the end of the file. +# This makes the format more resistant to corruption but there is a performance +# hit to pay (around 10%) when saving and loading RDB files, so you can disable it +# for maximum performances. +# +# RDB files created with checksum disabled have a checksum of zero that will +# tell the loading code to skip the check. +rdbchecksum yes + # The filename where to dump the DB dbfilename dump.rdb @@ -125,7 +156,7 @@ dir ./ # is still in progress, the slave can act in two different ways: # # 1) if slave-serve-stale-data is set to 'yes' (the default) the slave will -# still reply to client requests, possibly with out of data data, or the +# still reply to client requests, possibly with out of date data, or the # data set may just be empty if this is the first synchronization. # # 2) if slave-serve-stale data is set to 'no' the slave will reply with @@ -134,6 +165,52 @@ dir ./ # slave-serve-stale-data yes +# You can configure a slave instance to accept writes or not. Writing against +# a slave instance may be useful to store some ephemeral data (because data +# written on a slave will be easily deleted after resync with the master) but +# may also cause problems if clients are writing to it because of a +# misconfiguration. +# +# Since Redis 2.6 by default slaves are read-only. +# +# Note: read only slaves are not designed to be exposed to untrusted clients +# on the internet. It's just a protection layer against misuse of the instance. +# Still a read only slave exports by default all the administrative commands +# such as CONFIG, DEBUG, and so forth. To a limited extend you can improve +# security of read only slaves using 'rename-command' to shadow all the +# administrative / dangerous commands. +slave-read-only yes + +# Slaves send PINGs to server in a predefined interval. It's possible to change +# this interval with the repl_ping_slave_period option. The default value is 10 +# seconds. +# +# repl-ping-slave-period 10 + +# The following option sets a timeout for both Bulk transfer I/O timeout and +# master data or ping response timeout. The default value is 60 seconds. +# +# It is important to make sure that this value is greater than the value +# specified for repl-ping-slave-period otherwise a timeout will be detected +# every time there is low traffic between the master and the slave. +# +# repl-timeout 60 + +# The slave priority is an integer number published by Redis in the INFO output. +# It is used by Redis Sentinel in order to select a slave to promote into a +# master if the master is no longer working correctly. +# +# A slave with a low priority number is considered better for promotion, so +# for instance if there are three slaves with priority 10, 100, 25 Sentinel will +# pick the one wtih priority 10, that is the lowest. +# +# However a special priority of 0 marks the slave as not able to perform the +# role of master, so a slave with priority of 0 will never be selected by +# Redis Sentinel for promotion. +# +# By default the priority is 100. +slave-priority 100 + ################################## SECURITY ################################### # Require clients to issue AUTH before processing any other @@ -151,7 +228,7 @@ slave-serve-stale-data yes # Command renaming. # -# It is possilbe to change the name of dangerous commands in a shared +# It is possible to change the name of dangerous commands in a shared # environment. For instance the CONFIG command may be renamed into something # of hard to guess so that it will be still available for internal-use # tools but not available for general clients. @@ -160,37 +237,46 @@ slave-serve-stale-data yes # # rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52 # -# It is also possilbe to completely kill a command renaming it into +# It is also possible to completely kill a command renaming it into # an empty string: # # rename-command CONFIG "" ################################### 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. +# Set the max number of connected clients at the same time. By default +# this limit is set to 10000 clients, however if the Redis server is not +# able ot configure the process file limit to allow for the specified limit +# the max number of allowed clients is set to the current file limit +# minus 32 (as Redis reserves a few file descriptors for internal uses). +# # Once the limit is reached Redis will close all the new connections sending # an error 'max number of clients reached'. # -# maxclients 128 +# maxclients 10000 # 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. +# When the memory limit is reached Redis will try to remove keys +# accordingly to the eviction policy selected (see maxmemmory-policy). +# +# If Redis can't remove keys according to the policy, or if the policy is +# set to 'noeviction', Redis will start to reply with errors to commands +# that would use more memory, like SET, LPUSH, and so on, and will continue +# to reply to read-only commands like GET. +# +# This option is usually useful when using Redis as an LRU cache, or to set +# an hard memory limit for an instance (using the 'noeviction' policy). +# +# WARNING: If you have slaves attached to an instance with maxmemory on, +# the size of the output buffers needed to feed the slaves are subtracted +# from the used memory count, so that network problems / resyncs will +# not trigger a loop where keys are evicted, and in turn the output +# buffer of slaves is full with DELs of keys evicted triggering the deletion +# of more keys, and so forth until the database is completely emptied. +# +# In short... if you have slaves attached it is suggested that you set a lower +# limit for maxmemory so that there is some free RAM on the system for slave +# output buffers (but this is not needed if the policy is 'noeviction'). # # maxmemory @@ -200,7 +286,7 @@ slave-serve-stale-data yes # volatile-lru -> remove the key with an expire set using an LRU algorithm # allkeys-lru -> remove any key accordingly to the LRU algorithm # volatile-random -> remove a random key with an expire set -# allkeys->random -> remove a random key, any key +# allkeys-random -> remove a random key, any key # volatile-ttl -> remove the key with the nearest expire time (minor TTL) # noeviction -> don't expire at all, just return an error on write operations # @@ -227,21 +313,23 @@ slave-serve-stale-data yes ############################## 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. +# By default Redis asynchronously dumps the dataset on disk. This mode is +# good enough in many applications, but an issue with the Redis process or +# a power outage may result into a few minutes of writes lost (depending on +# the configured save points). +# +# The Append Only File is an alternative persistence mode that provides +# much better durability. For instance using the default data fsync policy +# (see later in the config file) Redis can lose just one second of writes in a +# dramatic event like a server power outage, or a single write if something +# wrong with the Redis process itself happens, but the operating system is +# still running correctly. # -# 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. +# AOF and RDB persistence can be enabled at the same time without problems. +# If the AOF is enabled on startup Redis will load the AOF, that is the file +# with the better durability guarantees. # -# IMPORTANT: Check the BGREWRITEAOF to check how to rewrite the append -# log file in background when it gets too big. +# Please check http://redis.io/topics/persistence for more information. appendonly no @@ -256,16 +344,19 @@ appendonly no # # 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. +# everysec: fsync only one time every second. 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 +# "no" that 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. # +# More details please check the following article: +# http://antirez.com/post/redis-persistence-demystified.html +# # If unsure, use "everysec". # appendfsync always @@ -284,7 +375,7 @@ appendfsync everysec # BGSAVE or BGREWRITEAOF is in progress. # # This means that while another child is saving the durability of Redis is -# the same as "appendfsync none", that in pratical terms means that it is +# the same as "appendfsync none", that in practical terms means that it is # possible to lost up to 30 seconds of log in the worst scenario (with the # default Linux settings). # @@ -292,40 +383,75 @@ appendfsync everysec # "no" that is the safest pick from the point of view of durability. no-appendfsync-on-rewrite no -#################################### DISK STORE ############################### - -# When disk store is active Redis works as an on-disk database, where memory -# is only used as a object cache. +# Automatic rewrite of the append only file. +# Redis is able to automatically rewrite the log file implicitly calling +# BGREWRITEAOF when the AOF log size will growth by the specified percentage. +# +# This is how it works: Redis remembers the size of the AOF file after the +# latest rewrite (or if no rewrite happened since the restart, the size of +# the AOF at startup is used). # -# This mode is good for datasets that are bigger than memory, and in general -# when you want to trade speed for: +# This base size is compared to the current size. If the current size is +# bigger than the specified percentage, the rewrite is triggered. Also +# you need to specify a minimal size for the AOF file to be rewritten, this +# is useful to avoid rewriting the AOF file even if the percentage increase +# is reached but it is still pretty small. # -# - less memory used -# - immediate server restart -# - per key durability, without need for backgrond savig +# Specify a percentage of zero in order to disable the automatic AOF +# rewrite feature. + +auto-aof-rewrite-percentage 100 +auto-aof-rewrite-min-size 64mb + +################################ LUA SCRIPTING ############################### + +# Max execution time of a Lua script in milliseconds. +# +# If the maximum execution time is reached Redis will log that a script is +# still in execution after the maximum allowed time and will start to +# reply to queries with an error. # -# On the other hand, with disk store enabled MULTI/EXEC are no longer -# transactional from the point of view of the persistence on disk, that is, -# Redis transactions will still guarantee that commands are either processed -# all or nothing, but there is no guarantee that all the keys are flushed -# on disk in an atomic way. +# When a long running script exceed the maximum execution time only the +# SCRIPT KILL and SHUTDOWN NOSAVE commands are available. The first can be +# used to stop a script that did not yet called write commands. The second +# is the only way to shut down the server in the case a write commands was +# already issue by the script but the user don't want to wait for the natural +# termination of the script. # -# Of course with disk store enabled Redis is not as fast as it is when -# working with just the memory back end. +# Set it to 0 or a negative value for unlimited execution without warnings. +lua-time-limit 5000 + +################################## SLOW LOG ################################### + +# The Redis Slow Log is a system to log queries that exceeded a specified +# execution time. The execution time does not include the I/O operations +# like talking with the client, sending the reply and so forth, +# but just the time needed to actually execute the command (this is the only +# stage of command execution where the thread is blocked and can not serve +# other requests in the meantime). +# +# You can configure the slow log with two parameters: one tells Redis +# what is the execution time, in microseconds, to exceed in order for the +# command to get logged, and the other parameter is the length of the +# slow log. When a new command is logged the oldest one is removed from the +# queue of logged commands. + +# The following time is expressed in microseconds, so 1000000 is equivalent +# to one second. Note that a negative number disables the slow log, while +# a value of zero forces the logging of every command. +slowlog-log-slower-than 10000 -diskstore-enabled no -diskstore-path redis.ds -cache-max-memory 0 -cache-flush-delay 0 +# There is no limit to this length. Just be aware that it will consume memory. +# You can reclaim memory used by the slow log with SLOWLOG RESET. +slowlog-max-len 128 ############################### ADVANCED CONFIG ############################### -# 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 512 -hash-max-zipmap-value 64 +# Hashes are encoded using a memory efficient data structure when they have a +# small number of entries, and the biggest entry does not exceed a given +# threshold. These thresholds can be configured using the following directives. +hash-max-ziplist-entries 512 +hash-max-ziplist-value 64 # Similarly to hashes, small lists are also encoded in a special way in order # to save a lot of space. The special representation is only used when @@ -348,9 +474,9 @@ zset-max-ziplist-value 64 # 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) +# 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 +# that is rehashing, 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. # @@ -366,10 +492,47 @@ zset-max-ziplist-value 64 # want to free memory asap when possible. activerehashing yes +# The client output buffer limits can be used to force disconnection of clients +# that are not reading data from the server fast enough for some reason (a +# common reason is that a Pub/Sub client can't consume messages as fast as the +# publisher can produce them). +# +# The limit can be set differently for the three different classes of clients: +# +# normal -> normal clients +# slave -> slave clients and MONITOR clients +# pubsub -> clients subcribed to at least one pubsub channel or pattern +# +# The syntax of every client-output-buffer-limit directive is the following: +# +# client-output-buffer-limit +# +# A client is immediately disconnected once the hard limit is reached, or if +# the soft limit is reached and remains reached for the specified number of +# seconds (continuously). +# So for instance if the hard limit is 32 megabytes and the soft limit is +# 16 megabytes / 10 seconds, the client will get disconnected immediately +# if the size of the output buffers reach 32 megabytes, but will also get +# disconnected if the client reaches 16 megabytes and continuously overcomes +# the limit for 10 seconds. +# +# By default normal clients are not limited because they don't receive data +# without asking (in a push way), but just after a request, so only +# asynchronous clients may create a scenario where data is requested faster +# than it can read. +# +# Instead there is a default limit for pubsub and slave clients, since +# subscribers and slaves receive data in a push fashion. +# +# Both the hard or the soft limit can be disabled just setting it to zero. +client-output-buffer-limit normal 0 0 0 +client-output-buffer-limit slave 256mb 64mb 60 +client-output-buffer-limit pubsub 32mb 8mb 60 + ################################## 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 +# 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. #