X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/7bf90179a32eeb7754c1a3244f6612ce780e7de4..5e78edb350c8060fa478182efc4e4aa729bbe154:/redis.conf

diff --git a/redis.conf b/redis.conf
index fc5ac59d..b087417a 100644
--- a/redis.conf
+++ b/redis.conf
@@ -1,18 +1,30 @@
 # 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 no
 
-# When run as a daemon, Redis write a pid file in /var/run/redis.pid by default.
-# You can specify a custom pid file location here.
+# 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 /var/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 connections.
+# specified all the interfaces will listen for incoming connections.
 #
 # bind 127.0.0.1
 
@@ -28,7 +40,7 @@ timeout 300
 loglevel verbose
 
 # Specify the log file name. Also 'stdout' can be used to force
-# the demon to log on the standard output. Note that if you use standard
+# 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
 
@@ -66,8 +78,14 @@ rdbcompression yes
 # The filename where to dump the DB
 dbfilename dump.rdb
 
-# For default save/load DB in/from the working directory
-# Note that you must specify a directory not a file name.
+# 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 ./
 
 ################################# REPLICATION #################################
@@ -94,6 +112,10 @@ dir ./
 #
 # 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
 
@@ -133,7 +155,7 @@ dir ./
 # 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.log. This file will
+# 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
@@ -141,13 +163,14 @@ dir ./
 # Still if append only mode is enabled Redis will load the data from the
 # log file at startup ignoring the dump.rdb file.
 #
-# The name of the append only file is "appendonly.log"
-#
 # IMPORTANT: Check the BGREWRITEAOF to check how to rewrite the append
 # log file in background when it gets too big.
 
 appendonly no
 
+# 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.
@@ -172,6 +195,26 @@ appendonly no
 appendfsync everysec
 # appendfsync no
 
+# When the AOF fsync policy is set to always or everysec, and a background
+# saving process (a background save or AOF log background rewriting) is
+# performing a lot of I/O against the disk, in some Linux configurations
+# Redis may block too long on the fsync() call. Note that there is no fix for
+# this currently, as even performing fsync in a different thread will block
+# our synchronous write(2) call.
+#
+# In order to mitigate this problem it's possible to use the following option
+# that will prevent fsync() from being called in the main process while a
+# 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
+# possible to lost up to 30 seconds of log in the worst scenario (with the
+# default Linux settings).
+# 
+# If you have latency problems turn this to "yes". Otherwise leave it as
+# "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
@@ -188,20 +231,16 @@ vm-enabled no
 
 # 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.
-#
-# The swap file name may contain "%p" that is substituted with the PID of
-# the Redis process, so the default name /tmp/redis-%p.vm will work even
-# with multiple instances as Redis will use, for example, redis-811.vm
-# for one instance and redis-593.vm for another one.
+# file for every redis process you are running. Redis will complain if the
+# swap file is already in use.
 #
-# Useless to say, the best kind of disk for a Redis swap file (that's accessed
-# at random) is a Solid State Disk (SSD).
+# 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-%p.vm
+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
@@ -255,23 +294,6 @@ vm-max-threads 4
 # in terms of number of queries per second. Use 'yes' if unsure.
 glueoutputbuf yes
 
-# Use object sharing. Can save a lot of memory if you have many common
-# string in your dataset, but performs lookups against the shared objects
-# pool so it uses more CPU and can be a bit slower. Usually it's a good
-# idea.
-#
-# When object sharing is enabled (shareobjects yes) you can use
-# shareobjectspoolsize to control the size of the pool used in order to try
-# object sharing. A bigger pool size will lead to better sharing capabilities.
-# In general you want this value to be at least the double of the number of
-# very common strings you have in your dataset.
-#
-# WARNING: object sharing is experimental, don't enable this feature
-# in production before of Redis 1.0-stable. Still please try this feature in
-# your development environment so that we can test it better.
-shareobjects no
-shareobjectspoolsize 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
@@ -279,6 +301,26 @@ shareobjectspoolsize 1024
 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