Install
\n——-
\nhttp:\/\/download.redis.io\/redis-stable.tar.gz<\/p>\n
$ wget http:\/\/download.redis.io\/redis-stable.tar.gz
\n$ tar xvzf redis-stable.tar.gz
\n$ cd redis-stable
\n$ make
\n$ make test # optional
\n————–
\n# yum install wget tcl
\n# wget http:\/\/download.redis.io\/releases\/redis-3.2.5.tar.gz
\n# tar xzf redis-3.2.5.tar.gz
\n# cd redis-3.2.5
\n# make
\n# make test
\n————–
\n$ sudo make install
\nOR
\n$ sudo cp src\/redis-server \/usr\/local\/bin\/
\n$ sudo cp src\/redis-cli \/usr\/local\/bin\/
\n$ sudo mkdir \/etc\/redis
\n$ sudo mkdir \/var\/redis
\n$ sudo cp utils\/redis_init_script \/etc\/init.d\/redis_6379
\n$ sudo cp redis.conf \/etc\/redis\/6379.conf
\n$ sudo mkdir \/var\/redis\/6379
\n$ sudo update-rc.d redis_6379 defaults # OR sudo chkconfig –add redis_6379
\n$ sudo \/etc\/init.d\/redis_6379 start
\n————–<\/p>\n
TERMS
\n—–
\nRESP (REdis Serialization Protocol)
\nRESP, the type of some data depends on the first byte:
\nSimple Strings “+”
\nErrors “-”
\nIntegers “:”
\nBulk Strings “$”
\nArrays “*”
\nRedis append-only file feature (AOF)<\/p>\n
COMMANDS
\n——–
\n$ redis-server # start server
\n\/etc\/init.d\/redis_PORT start
\n$ redis-cli [-p PORT] shutdown # stop server
\n\/etc\/init.d\/redis_PORT stop
\n$ redis-cli ping # check if working
\n$ redis-cli –stat [-i interval] # continuous stats mode
\n$ redis-cli –bigkeys # scan for big keys
\n$ redis-cli [-p port ] –scan [–pattern REGEX] # get a list of keys
\n$ redis-cli [-p port ] monitor # monitor commands
\n$ redis-cli [-p port ] –latency # monitor latency of instances
\n$ redis-cli [-p port ] –latency-history [-i interval]
\n$ redis-cli [-p port ] –latency-dist # spectrum of latencies
\n$ redis-cli –intrinsic-latency [-p port ] [test-time] # latency of system
\n$ redis-cli –intrinsic-latency 5
\n$ redis-cli –rdb <dest-filename> # remote RDB backup ($?=0 success)
\n$ redis-cli –rdb \/tmp\/dump.rdb
\n$ redis-cli –slave # slave mode (monitor master -> slave writes)
\n$ redis-cli –lru-test 10000000 # Least Recently Used (LRU) simulation
\n# used to help configure ‘maxmemory’ for LRU
\n$ redis-cli save # save dump file (dump.rdb) to $dir
\n$ redis-cli select <DB_NUMBER> # select DB
\n$ redis-cli dbsize # show size of DB
\n$ redis-cli connect <SERVER> <PORT> # connect to different servers\/ports
\n$ redis-cli debug restart
\n$ redis-cli –version
\n$ redis-cli pubsub channels [PATTERN]
\n$ redis-cli pubsub numsub [channel1 … channelN]
\n$ redis-cli subscribe\/psubscribe\/publish
\n$ redis-cli slowlog get [N]|len
\na. unique progressive identifier for every slow log entry.
\nb. timestamp at which the logged command was processed.
\nc. amount of time needed for its execution, in microseconds.
\nd. array composing the arguments of the command.<\/p>\n
FILES
\n—–
\nconfig file: \/etc\/redis\/6371.conf
\ndbfilename dump.rdb
\ndir \/var\/lib\/redis\/6371
\npidfile \/var\/run\/redis\/6371.pid
\nDB saved to:
\n\/var\/lib\/redis\/6371\/dump.rdb<\/p>\n
OPTIONS
\n——-
\n–raw, –no-raw<\/p>\n
Configuration
\n————-
\nredis.conf # well documented
\ndefault ports: 6379 \/ 16379 (cluster mode) \/ 26379 (Sentinel)<\/p>\n
daemonize no
\npidfile \/var\/run\/redis_6379.pid
\nport 6379
\nloglevel info
\nlogfile \/var\/log\/redis_6379.log
\ndir \/var\/redis\/6379<\/p>\n
keyword argument1 argument2 … argumentN<\/p>\n
slaveof 127.0.0.1 6380
\nrequirepass “hello world”
\nmaxmemory 2mb
\nmaxmemory-policy allkeys-lru
\nmasterauth <password>
\ndaemonize no # when run under daemontools<\/p>\n
Administration
\n————–
\n\/etc\/sysctl.conf
\n—
\nvm.overcommit_memory = 1 # sysctl vm.overcommit_memory=1
\necho never > \/sys\/kernel\/mm\/transparent_hugepage\/enabled<\/p>\n
# passing arguments via CLI
\n$ .\/redis-server –port 6380 –slaveof 127.0.0.1 6379<\/p>\n
redis> config get GLOB
\nredis> config set slaveof 127.0.0.1 6380
\nredis> config rewrite<\/p>\n
— —
\nActual config
\n—
\ndaemonize yes
\npidfile \/var\/run\/redis\/6371.pid
\nport 6371
\ntcp-backlog 511
\nbind 0.0.0.0
\ntimeout 0
\ntcp-keepalive 0
\nloglevel notice
\nlogfile “”
\nsyslog-enabled yes
\nsyslog-ident redis
\nsyslog-facility USER
\ndatabases 16
\nsave 900 1
\nsave 300 10
\nsave 60 10000
\nstop-writes-on-bgsave-error yes
\nrdbcompression yes
\nrdbchecksum yes
\ndbfilename dump.rdb
\ndir \/var\/lib\/redis\/6371
\nslaveof 10.200.18.115 6371 # only on slave(s)
\nslave-serve-stale-data yes
\nslave-read-only yes
\nrepl-disable-tcp-nodelay no
\nslave-priority 100
\nmaxclients 10000
\nmaxmemory-policy noeviction
\nappendonly no
\nappendfilename “appendonly.aof”
\nappendfsync everysec
\nno-appendfsync-on-rewrite no
\nauto-aof-rewrite-percentage 100
\nauto-aof-rewrite-min-size 64mb
\nlua-time-limit 5000
\nslowlog-log-slower-than 10000
\nslowlog-max-len 128
\nnotify-keyspace-events “”
\nhash-max-ziplist-entries 512
\nhash-max-ziplist-value 64
\nlist-max-ziplist-entries 512
\nlist-max-ziplist-value 64
\nset-max-intset-entries 512
\nzset-max-ziplist-entries 128
\nzset-max-ziplist-value 64
\nactiverehashing yes
\nclient-output-buffer-limit normal 0 0 0
\nclient-output-buffer-limit slave 256mb 64mb 60
\nclient-output-buffer-limit pubsub 32mb 8mb 60
\nhz 10
\naof-rewrite-incremental-fsync yes
\n—<\/p>\n
Replication
\n———–
\nredis> config set masterauth <password>
\npersistence = enabled OR automatic-restarts = disabled<\/p>\n
slaveof 192.168.1.1 6379
\nrepl-diskless-sync
\nrepl-diskless-sync-delay
\nslave-read-only
\nmasterauth <password> # config set masterauth <password>
\nmin-slaves-to-write <number of slaves>
\nmin-slaves-max-lag <number of seconds>
\nslave-announce-ip 5.5.5.5
\nslave-announce-port 1234<\/p>\n
Redis Sentinel (26379)
\n————–
\n– Monitoring
\n– Notification
\n– Automatic failover
\n– Configuration provider<\/p>\n
redis-sentinel \/path\/to\/sentinel.conf
\nOR
\nredis-server \/path\/to\/sentinel.conf –sentinel<\/p>\n
# typical minimal config
\n—
\n# sentinel monitor <master-group-name> <ip> <port> <quorum>
\n# sentinel down-after-milliseconds <master-name> <milliseconds> # default 30 secs
\n# sentinel failover-timeout <master-name> <milliseconds> # default 3 minutes
\n# sentinel parallel-syncs <master-name> <numslaves>
\n—
\n# example typical minimal config:
\n—
\nsentinel monitor mymaster 127.0.0.1 6379 2
\nsentinel down-after-milliseconds mymaster 60000
\nsentinel failover-timeout mymaster 180000
\nsentinel parallel-syncs mymaster 1
\n—
\n# additional configs
\n—
\n# bind 127.0.0.1 192.168.1.1
\n# protected-mode no
\n# sentinel announce-ip <ip>
\n# sentinel announce-port <port>
\n# dir <working-directory>
\n# syntax: sentinel <option_name> <master_name> <option_value>
\n# sentinel auth-pass <master-name> <password>
\n# sentinel down-after-milliseconds <master-name> <milliseconds> # default 30 secs
\n# sentinel parallel-syncs <master-name> <numslaves>
\n# sentinel failover-timeout <master-name> <milliseconds> # default 3 minutes
\n# sentinel notification-script <master-name> <script-path>
\n# passed: <event type> <event description>
\n# sentinel client-reconfig-script <master-name> <script-path>
\n# passed: <master-name> <role> <state> <from-ip> <from-port> <to-ip> <to-port>
\n# <state> is currently always “failover”
\n# <role> is either “leader” or “observer”
\n— — —
\n# actual config
\n—
\n\/etc\/redis\/sentinel_26371.conf
\n# redis-sentinel 2.8.9 configuration file
\n# sentinel_26371.conf
\ndaemonize no
\ndir “\/var\/lib\/redis\/sentinel_26371”
\npidfile “\/var\/run\/redis\/sentinel_26371.pid”
\nport 26371
\nbind 0.0.0.0
\nsentinel monitor iowa_master_staging 10.200.18.115 6375 2
\nsentinel config-epoch iowa_master_staging 0
\nsentinel leader-epoch iowa_master_staging 0
\nsentinel known-slave iowa_master_staging 10.200.20.234 6375
\nlogfile “”
\nsyslog-enabled yes
\nsyslog-ident “sentinel_26371”
\nsyslog-facility user
\n————-
\n# sentinel messages\/events
\n—
\n+monitor master <group-name> <ip> quorum <N><\/p>\n
# Testing
\n$ redis-cli -p PORT
\n127.0.0.1:PORT> SENTINEL master mymaster # info about master
\n127.0.0.1:PORT> SENTINEL slaves mymaster # info about slave(s)
\n127.0.0.1:PORT> SENTINEL sentinels mymaster # info about sentinel(s)
\n127.0.0.1:PORT> SENTINEL get-master-addr-by-name mymasterer # get address of master
\n$ redis-cli -p 6379 DEBUG sleep 30 # simulate master hanging
\n—
\nping
\nSENTINEL masters # get list of monitored masters and their state
\nSENTINEL master <master name>
\nSENTINEL slaves <master name>
\nSENTINEL sentinels <master name>
\nSENTINEL get-master-addr-by-name <master name>
\nSENTINEL reset <pattern> # reset all masters matching pattern
\nSENTINEL failover <master name> # force a failover
\nSENTINEL ckquorum <master name> # check if current config is able to failover
\nSENTINEL flushconfig # rewrite config file
\nSENTINEL monitor <name> <ip> <port> <quorum> # start monitoring a new master
\nSENTINEL remove <name> # stop monitoring master
\nSENTINEL SET <name> <option> <value>
\n—
\n# Commands
\n$<\/p>\n
Redis Cluster
\n————-
\nport 7000
\ncluster-enabled yes
\ncluster-config-file nodes.conf
\ncluster-node-timeout 5000
\nappendonly yes<\/p>\n
=====================================
\nredis1:$ WTFI redis-cli => \/nb\/redis\/bin\/redis-cli<\/p>\n
redis-cli -h <hostname> -p <port> -r <repeat (-1=forever)> -i <interval (secs)> -n <DB_NUM> <COMMAND>
\nredis-cli -p 6371|26371 info [server|clients|memory|persistence|stats|replication|cpu|keyspace|sentinel]
\nredis-cli -p 6371 ping
\n=====================================
\nUpgrading or restarting a Redis instance without downtime
\nCheck out: https:\/\/redis.io\/topics\/admin (bottom)
\n=====================================
\nfor p in $(grep ^port \/etc\/redis\/*|awk ‘{print $NF}’); do echo “—- port: $p —-“; \/nb\/redis\/bin\/redis-cli -p $p info | grep stat; done<\/p>\n
========== tool (redis_monit.sh) [begin] ==========
\n#!\/bin\/bash
\n# get status of redis servers
\nREDIS_CLI_CMD=\/nb\/redis\/bin\/redis-cli
\n# get the list of ports configured
\nports=$(ls \/etc\/redis\/*.conf | tr -d ‘[a-z\/.]’)
\nfor port in $ports; do
\necho “—- port: $port —-”
\nif [ -e \/etc\/redis\/$port.conf ]; then
\n$REDIS_CLI_CMD -p $port info | grep stat
\nelse
\necho “no config (\/etc\/redis\/$port.conf)”
\nfi
\ndone
\n========== tool (redis_monit.sh) [end] ==========<\/p>\n
# update the monitor hosts – “live”
\nsentinel monitor mymaster 127.0.0.1 6379 2
\nsentinel monitor redis2 10.204.21.219 6379 2
\nsentinel failover redis1
\nsentinel masters
\nsentinel slaves redis1<\/p>\n
# manual failover
\n# CLUSTER FAILOVER [FORCE|TAKEOVER]<\/p>\n
$ redis-cli -p 7002 debug segfault<\/p>\n","protected":false},"excerpt":{"rendered":"
Install ——- http:\/\/download.redis.io\/redis-stable.tar.gz<\/p>\n
$ wget http:\/\/download.redis.io\/redis-stable.tar.gz $ tar xvzf redis-stable.tar.gz $ cd redis-stable $ make $ make test # optional ————– # yum install wget tcl # wget http:\/\/download.redis.io\/releases\/redis-3.2.5.tar.gz # tar xzf redis-3.2.5.tar.gz # cd redis-3.2.5 # make # make test ————– $ sudo make install OR $ sudo cp src\/redis-server \/usr\/local\/bin\/ $ sudo cp […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/7509"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7509"}],"version-history":[{"count":1,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/7509\/revisions"}],"predecessor-version":[{"id":7510,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/7509\/revisions\/7510"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7509"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7509"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7509"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}