redis config file location ubuntu config settings

redis config file location ubuntu?

redis config file location /etc//redis/redis.conf

Table of Contents

wordpress redis configuration

Install : apt install redis
2. configure

sudo nano /etc/redis/redis.conf

maxmemory 256mb
maxmemory-policy allkeys-lru

LRU means least recently used key will be evicted if memory reaches to max.

redist basic configuration settings mandator to work as expected

maxmemory: default unlimited

eviction policy // defaut no eviction

Binding localhost or remote IP. //default same as localhost

part 2 redis configuration with php or wordpresss

apt install php-redis

or php7.4-redis

edit wp config

detailed at Redis installation on wordpress

lru = least recently used.

redis configuration file default 6.0

self documented here

where is redis config located?

linux & mac

/etc/redis/redis.conf

How do I configure Redis?

you can edit redis.conf for permanent changes, use redis command line to store in memory. below are list of redis configurable variables.

you can also check redis performance metrics.

important configuration settings in redis config file

maxmemory

eviction policy

RDB persistent

Binding localhost or remote IP.

redis slow logs

latency: in case of remote

Cluster or master

redis configuration settings all

network

keepalive
binding local or remote
snapshot
RDB
AOF – append only file

replication

latency
slowlogs
security
ACL rules

clinets
max client setttings
default 10000
memory
max memory
hard memory limit
deafult no limit:
maxmemory:0
used_memory_human:39.47M
maxmemory-policy noeviction default
LAZY FREEING
THREADED I/O
By default threading is disabled, we suggest enabling it only in machines
# that have at least 4 or more cores
KERNEL OOM CONTROL
Redis actively control the oom_score_adj value for all its processes
APPEND ONLY MOD
Append Only File is an alternative persistence mode fsync polcy

LUA SCRIPTING
Max execution time of a Lua script in milliseconds.

lua-time-limit 5000 // default

REDIS CLUSTER
CLUSTER DOCKER/NAT support
LATENCY MONITOR
By default latency monitoring is disabled
EVENT NOTIFICATION
Pub/Sub clients
GOPHER SERVER
old server 1990s
ADVANCED CONFIG
definetely look at
ACTIVE DEFRAGMENTATION
Active (online) defragmentation allows a Redis server to compact the
# spaces left between small allocations and deallocations of data in memory,
# thus allowing to reclaim back memory.
disabled by default

Redis config command

127.0.0.1:6379> CONFIG GET *
1) “dbfilename”
2) “dump.rdb”
3) “requirepass”
4) “”
5) “masterauth”
6) “”
7) “cluster-announce-ip”
8) “”
9) “unix socket”
10) “”
11) “logfile”
12) “/var/log/redis/redis-server.log”
13) “pidfile”
14) “/var/run/redis/redis-server.pid”
15) “slave-announce-ip”
16) “”
17) “maxmemory”
18) “0”
19) “proto-max-bulk-len”
20) “536870912”
21) “client-query-buffer-limit”
22) “1073741824”
23) “maxmemory-samples”
24) “5”
25) “lfu-log-factor”
26) “10”
27) “lfu-decay-time”
28) “1”
29) “timeout”
30) “0”
31) “active-defrag-threshold-lower”
32) “10”
33) “active-defrag-threshold-upper”
34) “100”
35) “active-defrag-ignore-bytes”
36) “104857600”
37) “active-defrag-cycle-min”
38) “25”
39) “active-defrag-cycle-max”
40) “75”
41) “auto-aof-rewrite-percentage”
42) “100”
43) “auto-aof-rewrite-min-size”
44) “67108864”
45) “hash-max-ziplist-entries”
46) “512”
47) “hash-max-ziplist-value”
48) “64”
49) “list-max-ziplist-size”
50) “-2”
51) “list-compress-depth”
52) “0”
53) “set-max-intset-entries”
54) “512”
55) “zset-max-ziplist-entries”
56) “128”
57) “zset-max-ziplist-value”
58) “64”
59) “hll-sparse-max-bytes”
60) “3000”
61) “lua-time-limit”
62) “5000”
63) “slowlog-log-slower-than”
64) “10000”
65) “latency-monitor-threshold”
66) “0”
67) “slowlog-max-len”
68) “128”
69) “port”
70) “6379”
71) “cluster-announce-port”
72) “0”
73) “cluster-announce-bus-port”
74) “0”
75) “tcp-backlog”
76) “511”
77) “databases”
78) “16”
79) “repl-ping-slave-period”
80) “10”
81) “repl-timeout”
82) “60”
83) “repl-backlog-size”
84) “1048576”
85) “repl-backlog-ttl”
86) “3600”
87) “maxclients”
88) “10000”
89) “watchdog-period”
90) “0”
91) “slave-priority”
92) “100”
93) “slave-announce-port”
94) “0”
95) “min-slaves-to-write”
96) “0”
97) “min-slaves-max-lag”
98) “10”
99) “hz”
100) “10”
101) “cluster-node-timeout”
102) “15000”
103) “cluster-migration-barrier”
104) “1”
105) “cluster-slave-validity-factor”
106) “10”
107) “repl-diskless-sync-delay”
108) “5”
109) “tcp-keepalive”
110) “300”
111) “cluster-require-full-coverage”
112) “yes”
113) “cluster-slave-no-failover”
114) “no”
115) “no-appendfsync-on-rewrite”
116) “no”
117) “slave-serve-stale-data”
118) “yes”
119) “slave-read-only”
120) “yes”
121) “stop-writes-on-bgsave-error”
122) “yes”
123) “daemonize”
124) “yes”
125) “rdbcompression”
126) “yes”
127) “rdbchecksum”
128) “yes”
129) “activerehashing”
130) “yes”
131) “activedefrag”
132) “no”
133) “protected-mode”
134) “yes”
135) “repl-disable-tcp-nodelay”
136) “no”
137) “repl-diskless-sync”
138) “no”
139) “aof-rewrite-incremental-fsync”
140) “yes”
141) “aof-load-truncated”
142) “yes”
143) “aof-use-rdb-preamble”
144) “no”
145) “lazyfree-lazy-eviction”
146) “no”
147) “lazyfree-lazy-expire”
148) “no”
149) “lazyfree-lazy-server-del”
150) “no”
151) “slave-lazy-flush”
152) “no”
153) “maxmemory-policy”
154) “noeviction”
155) “loglevel”
156) “notice”
157) “supervised”
158) “no”
159) “appendfsync”
160) “everysec”
161) “syslog-facility”
162) “local0”
163) “appendonly”
164) “no”
165) “dir”
166) “/var/lib/redis”
167) “save”
168) “”
169) “client-output-buffer-limit”
170) “normal 0 0 0 slave 268435456 67108864 60 pubsub 33554432 8388608 60”
171) “unixsocketperm”
172) “0”
173) “slaveof”
174) “”
175) “notify-keyspace-events”
176) “”
177) “bind”
178) “127.0.0.1 ::1”
127.0.0.1:6379>

redis tcp keep alive for local host

From version 3.2 onwards, Redis has TCP keepalive ( SO_KEEPALIVE socket option) enabled by default and set to about 300 seconds.

redis.conf sample text

redsconf.txt file

monitor redis by using redis commands