Redis (2.8 version) configuration file parameters in Chinese

#daemonize  no  , redis  is not running in the background by default, if you need to run in the background, change the value of the item to  yesdaemonize yes#    when the  redis  is running in the background,, redis  will put the  pid  file in  /var/run/redis.pid&nbsp by default; You can configure it to a different address. #   when running multiple  redis  services, you need to specify a different  pid  file and port pidfile /var/run/redis_6379.pid#    Specify the  redis  run port, by default  6379port 6379#   in high Concurrency environment, in order to avoid slow client connection problems, Need to set up a high-speed background log tcp-backlog 511#   specify  redis  only receive requests from this  IP  address, and if not set, all requests will be processed #  bind 192.168.1.100 10.0.0.1# bind 127.0.0.1#   sets the time-out period in seconds for client connections. When the client has not issued any instructions during this time, then closing the connection # 0  is to turn off this setting timeout 0# tcp keepalive#   in  linux On  , specify the time that the value (in seconds) is used to send  ACKs . Note that it takes twice as long to close the connection. The default is  0 . tcp-keepalive 0#   Specify logging level, production environment recommendation  notice# Redis  Total support four levels: debug ,  verbose ,  notice ,  warning , default =  verbose# debug      records a lot of information for developing and testing # varbose    useful information, unlike  debug   will record so many # notice     common  verbose&nbsp, often used in production environments # warning     Only very important or critical information is logged to the log loglevel notice#   configuration  log  file address #   default value is  stdout  , standard output, if the background mode will be output to  /dev/null . logfile /var/log/redis/redis.log#   the number of available databases #   The default is &NBSP;16&NBSP, and the default database is  0  Database scope databases 16################################  snapshots between  0-  ( database-1 ) ####### ###########################   save data to disk in the following format  :#   save <seconds>  <changes>#     points out how many times the update operation will synchronize the data to the data file  rdb . #     is equivalent to conditional triggering of a snapshot, which can be combined with multiple conditions #     such as the settings in the default configuration file, set three conditions #   At least  1   key  changed in  save 900 1  900  seconds #   save  300&nbsAt least  300  in p;10  300  seconds  key  is changed #   save 60 10000 At least  10000   key  changed in   60  seconds # save 900 1# save 300  10# save 60 10000#   Background Store error stop writing. stop-writes-on-bgsave-error yes#   data is compressed when stored to a local database (persisted to  rdb  file), default =   yesrdbcompression yes# rdb  file is direct idol  chcksumrdbchecksum yes#   local persistent database file name, The default value is the path to the file placement of the  dump.rdbdbfilename dump.rdb#   working directory #   database mirroring backup. #   The path here is configured separately from the file name because  redis , when it is being backed up, writes the current database's state to a temporary file, and so on, when the backup is complete,#   The temporary file is replaced with the file specified above, and the temporary file and the backup file configured above will be placed in the specified path. # aof  files will also be stored under this directory #   Note that there must be a directory instead of files dir /var/lib/redis-server/#################### #############  replication  ##################################   Master-slave replication  .  set the database for other databases from the database  .#   set up  master  when this machine is  slav  serviceThe  IP  address and port of the service, which automatically synchronizes data from  master  at  Redis  start # slaveof <masterip> <masterport>#   When password protection is set for  master  service   (  password  requirepass  with  ) #  slave  Service Connection  master  password # masterauth <master-password>#   When the connection is lost from the library or the replication is in progress, there are two modes of operation from the hangar: # 1)    If  slave-serve-stale-data  is set to  yes (  default setting  ) &nbsp, from the library will continue to respond to client requests # 2)    if  slave-serve-stale-data  is referred to as  no , go out   Any request other than the info  and  SLAVOF  command will return a #      error   "Sync with master  in progress "slave-serve-stale-data yes#   configuration  slave  whether the instance accepts write. Write  slave  to store ephemeral data (which can be easily removed after synchronizing with  master  data) is useful, but not configured, client write may send a problem. #   from  Redis2.6 , the default  slave  is  read-onlyslaveread-only yes#   The library is sent to the main library at a time interval  PINGs.  can be  repl-ping-slave-period  set this time interval, default is  10  second # repl-ping-slave-period 10# repl-timeout   Set the main library bulk data transfer time or  ping  reply interval, the default value is  60  second #   make sure  repl-timeout  is greater than   repl-ping-slave-period# repl-timeout 60#   in  slave socket   SYNC  After disabling  TCP_NODELAY#   if you select " yes "  ,Redis  will use a smaller number  TCP  Packets and less bandwidth send the data to  slave ,  but this can cause the data to be sent to the  slave  end with a delay  ,  if it is  Linux  The default configuration of the kernel  will reach  40  milliseconds  .#   if you select   "No" &nbsp, the delay in sending the data to the  slave  side will decrease, However, more bandwidth will be used to replicate  .repl-disable-tcp-nodelay no#   set the background log size for replication. The larger the #   replicated background log, the longer it will take to, slave  to disconnect and later possibly perform partial replication. #   background logs are allocated only once when there is at least one  slave  connection. # repl-backlog-size 1mb#   after  master  no longer connects  slave , the background log will be released. The following configuration defines the time (in seconds) to be freed from the last  slave  disconnected. # 0  means never releasing the background log # repl-backlog-ttl 3600#   if  master  does not work, then in multiple  slave , select one of the least priority values   slave  promoted to  master  The precedence value of  0  indicates that it cannot be promoted to  master . slave-priority 100#   If there is less than  N   slave  connection and the delay time  <=M  seconds, the   master  can be configured to stop accepting write operations. #   For example requires a configuration of at least  3   slave  connections, and a delay of  <=10  seconds: # min-slaves-to-write  3# min-slaves-max-lag 10#   settings  0  to disable #    default   min-slaves-to-write  for  0  (disabled), min-slaves-max-lag  for  10########################### #######  Security  ####################################   Sets the password to be used before any other specified client connection is made. #   Warning: Because the  redis  speed is quite fast, in a better server, an external user can be in a second  150K  times the password attempt, This means that you need to specify very very strong passwords to prevent brute Force # requirepass foobared#   command renaming  .#   In a shared environment, you can rename a relatively dangerous command. For example, the name  CONFIG  is a character that is not easy to guess. #   Example  :# rename-command config b840fc02d524045429941cc15f59e41cb7be6c52#   If you want to delete a command, rename it directly to a null character   ""  , as follows:# rename-command config  "" ###################################  constraint ############## ##################### #设置同一时间最大客户端连接数, default unrestricted,  #Redis   Number of client connections that can be opened at the same time as the maximum number of file descriptors that the  Redis  process can open, # If &NBSP;&NBSP;MAXCLIENTS&NBSP;0&NBSP is set, it means no restrictions. #当客户端连接数到达限制时, redis  will close the new connection and return the  max number of clients reached  error message to the client # maxclients 10000#   specify  Redis  maximum memory limit, redis  will load data into memory at startup, after maximum memory is reached,  Redis  will attempt to purge expired  Key#   if  Redis  after policy cleanup fails to provide sufficient space, or if the policy is set to  , according to the purge policy Noeviction "&nbsp, the command to use more space will be an error, such as  SET, LPUSH . But can still be read operation #   Note: redis  New  vm  mechanism, will put  Key  storage memory, value  will be stored in  swap  area #   This option is useful for  LRU  policies. The # maxmemory  setting is better suited to use  redis  as a cache like  memcached ,And not as a real  DB . #   when using  Redis  as a real database, memory usage will be a big expense # maxmemory <bytes>#   What data does  Redis  choose to delete when the memory reaches the maximum value? There are five ways to choose # volatile-lru ->   Use the  LRU  algorithm to remove  key  (lru:  most recently used) with set expiration time   Least RecentlyUsed ) # allkeys-lru ->   uses the  LRU  algorithm to remove any  key# volatile-random ->   remove random  key# allkeys->random -with set over expiration time > remove a randomkey, any key# volatile-ttl ->   Remove Expiring  key (MINOR&NBSP;TTL) # noeviction ->   do not remove any can, just return a write error #   Note: For the above policy, If there is no suitable  key  can be removed, when writing  Redis  will return an error #   default is  :  volatile-lru#  maxmemory-policy volatile-lru  # lru   and   minimal TTL  Algorithms are not exact algorithms, but relatively accurate algorithms   (  in order to save memory  ) &NBSP, optionally you can select sample size for detection. # redis  default Gray selection  3  samples for detection, you can set it through  maxmemory-samples  # maxmemory-samples 3###### ######################## aof################################   By default, redis  Asynchronously backs up the database image to disk in the background, but the backup is very time consuming, and the backup is not very frequent, if the situation such as power cut, unplug, etc., will result in a large range of data loss. #   so  redis  provides another more efficient way of database backup and disaster recovery. #   Open  append only  mode, redis  will append every write request received to  appendonly.aof  File, when  redis  restarts, the previous state is recovered from the file. #   but this causes the  appendonly.aof  file to be too large, so  redis  also supports the  BGREWRITEAOF  directive, the   appendonly.aof  to be re-organized. #   you can open  asynchronous dumps  and   AOFappendonly no# AOF  file names at the same time    (  default  :  "Appendonly.aof") # appendfilename appendonly.aof# redis  Support three kinds of synchronization  AOF  file strategy  :# no:   do not synchronize, the system to operate   . faster.# always:  always  indicates that each write operation is synchronized  . slow, safest.# everysec:   indicates that the write operation is cumulative, synchronized once per second  . Compromise.#   default is   " Everysec "&NBSP; it's best to compromise on speed and safety. #   If you want  Redis  to run more efficiently, you can also set the   "No" &nbsp, and let the operating system decide when to execute #   Or on the contrary, to make the data more secure you can also set the   "Always" #   if you are unsure, use    "Everysec" .# appendfsync  alwaysappendfsync everysec# appendfsync no# aof  policy set to  always  or   everysec , the background processing process   (  background save or  AOF  log rewrite  )   performs a lot of  I/O  operations #   Too long  fsync ()   requests are blocked in some  Linux  configurations. Note that there is now no fix, even if  fsync  is working on another thread #   in order to mitigate this problem, you can set the following parameter   no-appendfsync-on-rewriteno-appendfsync-on-rewrite no# aof   automatic rewrite #   when  AOF   When the file grows to a certain size  Redis  can invoke   BGREWRITEAOF   rewrite the log file #   it works like this:  Redis  remembers the size of the file after the last log (  if it has not been rewritten since it was powered on, the day size is determined   at boot time) #   The base size is compared to the current size. If the currentWhen the size is larger than the base size, the rewrite feature will start #   and also need to specify a minimum size for  AOF  rewrite, which is used to block even if the file is small but grows very large also to rewrite  AOF  The case of the file #   set   percentage  for  0  turns off this feature auto-aof-rewrite-percentage  100auto-aof-rewrite-min-size 64mb################################ luascripting ################ ##############  a  Lua  script has a maximum execution time of  5000  milliseconds ( 5  seconds), and if the  0  or negative number represents an infinite execution time. lua-time-limit 5000############################### #LOW  LOG#################################  redis slow log   records a command that exceeds a specific execution time. Execution time does not include  I/O  calculations such as connecting clients, returning results, etc., only the command execution time #   can be set by two parameters  slow log : One is to tell   redis   slowlog-log-slower-than (  subtle  )  ,#   another is  slow  how much time is logged for the parameter to be executed The length of the log . When a new command is recorded, the oldest command will be removed from the queue #   the time in subtle units, so  1000000  stands for one second. #   Note Specifying a negative number will turn off slow logging, and setting to  0  will force each command to log slowlog-log-slower-than 10000#   to the journal lengthThere is no limit, just be aware that it consumes memory #   can be used by   SLOWLOG RESET  recycle memory consumed by slow log #   recommended default value  128   When the slow log exceeds  128 , the record that first enters the queue is kicked out slowlog-max-len 128################################    Event Notification   ##############################  , redis  can notify  pub/sub when an event occurs   Client. #   You can select the type of event to be notified in the following table  Redis . The event type identifies the:# k     keyspace  event by a single character to  [email protected]<db>_   prefix to publish the # e     keyevent  event to  [email protected]<db>_ The   prefix method publishes # g      common events (unspecified types), like  del, expire, rename, ...#  $     String  Command # s     set  command # h      Hash  command # z      ordered set command # x       expiration events (generated each time  key  expires) # e      clearEvent (when  key  is generated when memory is cleared) # a     g$lshzxe  's nickname, so   "AKE"   means that all events # notify-keyspace-events  with a string parameter consisting of  0  to more than one character. An empty string means that the notification is disabled. #   Example: Enable  list  and General event:# notify-keyspace-events elg#   The default notification is disabled, Because the user usually does not need to change the characteristics, and this feature will have a performance loss. #   Note If you do not specify at least one of the  K  or  E , no events will be sent. notify-keyspace-events  "" ##############################   Advanced Configuration   ###################### ##########   when  hash  contains more than the specified number of elements and the largest element does not exceed the critical time,,# hash  will be stored in a special encoding method (greatly reducing memory usage). Here you can set the two critical values # redis hash  corresponds to  Value  inside the actual is a  hashmap  actually there will be  2  Different implementations,#   This  Hash  's members are relatively young  Redis  in order to save memory will be similar to a one-dimensional array in a way to compact storage, without the use of real  hashmap   structure, corresponding  valueredisObject   encoding   zipmap,#   when the number of members increases, it automatically turns into a real   hashmap,  at this time  encoding  for  ht . hash-max-zipmap-entries 512hash-max-zipmap-value 64  #   and  Hash , many small  list  coded in a specific way to save space. # list  data Type node value size is less than how many bytes are in a compact storage format. list-max-ziplist-entries 512list-max-ziplist-value 64# set  data type Internal data if all are numeric, And how many nodes are included below are stored in a compact format. set-max-intset-entries 512#   and  hashe   ,  sort of  set like  list    Save space by specifying encoding within the specified length # zsort  data type node value size is less than how many bytes are in a compact storage format. zset-max-ziplist-entries 128zset-max-ziplist-value 64# redis  will be used in every  100  milliseconds   1  milliseconds of  CPU  time to re- hash&nbsp the  hash  table of  redis , which can reduce the use of memory #   When you have a very strict real-time requirement in your usage scenario, you cannot accept  Redis  occasionally have a  2  millisecond delay for the request, which is configured as  no . #   If you do not have such strict real-time requirements, you can set it to  yes&nbsp, so that you can free up memory activerehashing yes#  the client's output buffer limit as soon as possible. For some reason, the client is not fast enough to read data from the server,#  can be used to force disconnection (a common reason is that the speed at which a publish  /  subscribe client consumes messages cannot catch up with the speed at which they are produced). #   can be set up in three different client ways:# normal ->   Normal client # slave  -> slave  and  MONITOR  client # pubsub  ->   has subscribed to at least one  pubsub channel  or  pattern  client #   each   client-output-buffer-limit  Grammar  :# client-output-buffer-limit <class> 

Redis (2.8 version) configuration file parameters in Chinese