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Redis Tutorial

Redis Configuration

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Configuration

The proper way to configure Redis is by providing a Redis configuration file, usually called redis.conf (available at root the directory of redis). Though Redis is able to start without a configuration file using a built-in default configuration, however, this setup is only recommended for testing and development purposes.

The redis.conf file contains a number of directives, here is the format :

keyword argument1 argument2 ... argumentN

Here is an example of configuration directive:

slaveof 127.0.0.1 6380

Changing Redis configuration while the server is running :

It is possible to reconfigure Redis on the fly without stopping and restarting the service or querying the current configuration programmatically using the special commands CONFIG SET and CONFIG GET. Not all the configuration directives are supported in this way, but most are supported as expected.

Here is the basic syntax of redis CONFIG command is shown below:

redis 127.0.0.1:6379> CONFIG GET CONFIG_SETTING_NAME

Example

127.0.0.1:6379> config get save 
1) "save"
2) "900 1 300 10 60 10000"

Use * in place of CONFIG_SETTING_NAME to get all configuration settings.

Example

127.0.0.1:6379> CONFIG GET *
  1) "dbfilename"
  2) "dump.rdb"
  3) "requirepass"
  4) ""
  5) "masterauth"
  6) ""
  7) "unixsocket"
  8) ""
  9) "logfile"
 10) "/var/log/redis_6379.log"
 11) "pidfile"
 12) "/var/run/redis_6379.pid"
 13) "maxmemory"
 14) "0"
 15) "maxmemory-samples"
 16) "5"
 17) "timeout"
 18) "0"
 19) "tcp-keepalive"
 20) "0"
 21) "auto-aof-rewrite-percentage"
 22) "100"
 23) "auto-aof-rewrite-min-size"
 24) "67108864"
 25) "hash-max-ziplist-entries"
 26) "512"
 27) "hash-max-ziplist-value"
 28) "64"
 29) "list-max-ziplist-entries"
 30) "512"
 31) "list-max-ziplist-value"
 32) "64"
 33) "set-max-intset-entries"
 34) "512"
 35) "zset-max-ziplist-entries"
 36) "128"
 37) "zset-max-ziplist-value"
 38) "64"
 39) "hll-sparse-max-bytes"
 40) "3000"
 41) "lua-time-limit"
 42) "5000"
 43) "slowlog-log-slower-than"
 44) "10000"
 45) "latency-monitor-threshold"
 46) "0"
 47) "slowlog-max-len"
 48) "128"
 49) "port"
 50) "6379"
 51) "tcp-backlog"
 52) "511"
 53) "databases"
 54) "16"
 55) "repl-ping-slave-period"
 56) "10"
 57) "repl-timeout"
 58) "60"
 59) "repl-backlog-size"
 60) "1048576"
 61) "repl-backlog-ttl"
 62) "3600"
 63) "maxclients"
 64) "10000"
 65) "watchdog-period"
 66) "0"
 67) "slave-priority"
 68) "100"
 69) "min-slaves-to-write"
 70) "0"
 71) "min-slaves-max-lag"
 72) "10"
 73) "hz"
 74) "10"
 75) "cluster-node-timeout"
 76) "15000"
 77) "cluster-migration-barrier"
 78) "1"
 79) "cluster-slave-validity-factor"
 80) "10"
 81) "repl-diskless-sync-delay"
 82) "5"
 83) "cluster-require-full-coverage"
 84) "yes"
 85) "no-appendfsync-on-rewrite"
 86) "no"
 87) "slave-serve-stale-data"
 88) "yes"
 89) "slave-read-only"
 90) "yes"
 91) "stop-writes-on-bgsave-error"
 92) "yes"
 93) "daemonize"
 94) "yes"
 95) "rdbcompression"
 96) "yes"
 97) "rdbchecksum"
 98) "yes"
 99) "activerehashing"
100) "yes"
101) "repl-disable-tcp-nodelay"
102) "no"
103) "repl-diskless-sync"
104) "no"
105) "aof-rewrite-incremental-fsync"
106) "yes"
107) "aof-load-truncated"
108) "yes"
109) "appendonly"
110) "no"
111) "dir"
112) "/var/lib/redis/6379"
113) "maxmemory-policy"
114) "noeviction"
115) "appendfsync"
116) "everysec"
117) "save"
118) "900 1 300 10 60 10000"
119) "loglevel"
120) "notice"
121) "client-output-buffer-limit"
122) "normal 0 0 0 slave 268435456 67108864 60 pubsub 33554432 8388608 60"
123) "unixsocketperm"
124) "0"
125) "slaveof"
126) ""
127) "notify-keyspace-events"
128) ""
129) "bind"
130) ""

Edit configuration

To update configuration, you can use CONFIG set command

Basic syntax of CONFIG SET command :

CONFIG SET CONFIG_SETTING_NAME NEW_CONFIG_VALUE

Example :

127.0.0.1:6379> CONFIG SET loglevel "notice"
OK
127.0.0.1:6379> CONFIG GET loglevel
1) "loglevel"
2) "notice"


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