Add checksum computation to rio.c

[redis.git] / redis.conf

diff --git a/redis.conf b/redis.conf
index b087417a8ca81fc16714bba1cf0e7f4e0fdb372e..5c16143c7c8aec618eb9dcdc34a5a16d506211b4 100644 (file)
--- a/redis.conf
+++ b/redis.conf
@@ -1,6 +1,6 @@
 # Redis configuration file example
 
 # 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
 # it in the usual form of 1k 5GB 4M and so forth:
 #
 # 1k => 1000 bytes


@@ -20,7 +20,8 @@ daemonize no
 # default. You can specify a custom pid file location here.
 pidfile /var/run/redis.pid
 
 # default. You can specify a custom pid file location here.
 pidfile /var/run/redis.pid
 

-# Accept connections on the specified port, default is 6379
+# Accept connections on the specified port, default is 6379.
+# If port 0 is specified Redis will not listen on a TCP socket.

 port 6379
 
 # If you want you can bind a single interface, if the bind option is not
 port 6379
 
 # If you want you can bind a single interface, if the bind option is not


@@ -28,8 +29,15 @@ port 6379
 #
 # bind 127.0.0.1
 
 #
 # bind 127.0.0.1
 

+# Specify the path for the unix socket that will be used to listen for
+# incoming connections. There is no default, so Redis will not listen
+# 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)
 # 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:
 
 # Set server verbosity to 'debug'
 # it can be one of:


@@ -37,13 +45,23 @@ 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)
 # 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
 # output for logging but daemonize, logs will be sent to /dev/null
 logfile stdout
 
 
 # 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
 

+# To enable logging to the system logger, just set 'syslog-enabled' to yes,
+# and optionally update the other syslog parameters to suit your needs.
+# syslog-enabled no
+
+# Specify the syslog identity.
+# syslog-ident redis
+
+# Specify the syslog facility.  Must be USER or between LOCAL0-LOCAL7.
+# syslog-facility local0
+

 # 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
 # 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


@@ -64,11 +82,32 @@ databases 16
 #   after 60 sec if at least 10000 keys changed
 #
 #   Note: you can disable saving at all commenting all the "save" lines.
 #   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
 
 
 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
 # 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


@@ -104,6 +143,50 @@ dir ./
 #
 # masterauth <master-password>
 
 #
 # masterauth <master-password>
 

+# When a slave lost the connection with the master, or when the replication
+# 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 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
+#    an error "SYNC with master in progress" to all the kind of commands
+#    but to INFO and SLAVEOF.
+#
+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
+

 ################################## SECURITY ###################################
 
 # Require clients to issue AUTH <PASSWORD> before processing any other
 ################################## SECURITY ###################################
 
 # Require clients to issue AUTH <PASSWORD> before processing any other


@@ -119,35 +202,91 @@ dir ./
 #
 # requirepass foobared
 
 #
 # requirepass foobared
 

+# Command renaming.
+#
+# 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.
+#
+# Example:
+#
+# rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
+#
+# It is also possible to completely kill a command renaming it into
+# an empty string:
+#
+# rename-command CONFIG ""
+

 ################################### LIMITS ####################################
 
 ################################### 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'.
 #
 # 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.
 
 # 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 <bytes>
 
 #
 # maxmemory <bytes>
 

+# MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
+# is reached? You can select among five behavior:
+# 
+# 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
+# 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
+# 
+# Note: with all the kind of policies, Redis will return an error on write
+#       operations, when there are not suitable keys for eviction.
+#
+#       At the date of writing this commands are: set setnx setex append
+#       incr decr rpush lpush rpushx lpushx linsert lset rpoplpush sadd
+#       sinter sinterstore sunion sunionstore sdiff sdiffstore zadd zincrby
+#       zunionstore zinterstore hset hsetnx hmset hincrby incrby decrby
+#       getset mset msetnx exec sort
+#
+# The default is:
+#
+# maxmemory-policy volatile-lru
+
+# LRU and minimal TTL algorithms are not precise algorithms but approximated
+# algorithms (in order to save memory), so you can select as well the sample
+# size to check. For instance for default Redis will check three keys and
+# pick the one that was used less recently, you can change the sample size
+# using the following configuration directive.
+#
+# maxmemory-samples 3
+

 ############################## APPEND ONLY MODE ###############################
 
 # By default Redis asynchronously dumps the dataset on disk. If you can live
 ############################## APPEND ONLY MODE ###############################
 
 # By default Redis asynchronously dumps the dataset on disk. If you can live


@@ -183,7 +322,7 @@ appendonly no
 #
 # 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
 #
 # 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
 # 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


@@ -207,7 +346,7 @@ appendfsync everysec
 # BGSAVE or BGREWRITEAOF is in progress.
 #
 # This means that while another child is saving the durability of Redis is
 # 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).
 # 
 # possible to lost up to 30 seconds of log in the worst scenario (with the
 # default Linux settings).
 # 


@@ -215,97 +354,100 @@ appendfsync everysec
 # "no" that is the safest pick from the point of view of durability.
 no-appendfsync-on-rewrite no
 
 # "no" that is the safest pick from the point of view of durability.
 no-appendfsync-on-rewrite 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.
+# 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).

 #
 #

-# The best kind of storage for the Redis swap file (that's accessed at random) 
-# is a Solid State Disk (SSD).
+# 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.

 #
 #

-# *** 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
+# Specify a percentage of zero in order to disable the automatic AOF
+# rewrite feature.

 
 

-# 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
+auto-aof-rewrite-percentage 100
+auto-aof-rewrite-min-size 64mb

 
 

-# 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
+################################ LUA SCRIPTING  ###############################

 
 

-# 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.
+# Max execution time of a Lua script in milliseconds.

 #
 #

-# The total swap size is vm-page-size * vm-pages
+# 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.

 #
 #

-# 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.
+# 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.

 #
 #

-# 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
+# Set it to 0 or a negative value for unlimited execution without warnings.
+lua-time-limit 5000

 
 

-# 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
+################################## SLOW LOG ###################################

 
 

-############################### ADVANCED CONFIG ###############################
+# 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

 
 

-# 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
+# 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 1024

 
 

-# 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
+############################### ADVANCED CONFIG ###############################
+
+# 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
+# you are under the following limits:
+list-max-ziplist-entries 512
+list-max-ziplist-value 64
+
+# Sets have a special encoding in just one case: when a set is composed
+# of just strings that happens to be integers in radix 10 in the range
+# of 64 bit signed integers.
+# The following configuration setting sets the limit in the size of the
+# set in order to use this special memory saving encoding.
+set-max-intset-entries 512
+
+# Similarly to hashes and lists, sorted sets are also specially encoded in
+# order to save a lot of space. This encoding is only used when the length and
+# elements of a sorted set are below the following limits:
+zset-max-ziplist-entries 128
+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
 
 # 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
 # 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.
 # 
 # server is idle the rehashing is never complete and some more memory is used
 # by the hash table.
 # 


@@ -321,10 +463,47 @@ hash-max-zipmap-value 512
 # want to free memory asap when possible.
 activerehashing yes
 
 # 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 <class> <hard limit> <soft limit> <soft seconds>
+#
+# 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
 ################################## 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.
 #
 # to customize a few per-server settings.  Include files can include
 # other files, so use this wisely.
 #