Redis集群新增、刪除節(jié)點(diǎn)以及動(dòng)態(tài)增加內(nèi)存的方法

cp redis7001.conf redis7002.conf

cd ../bin/
./redis-server ../etc/redis7002.conf

./redis-cli --cluster add-node 127.0.0.3:7002 127.0.0.1:7002
./redis-cli --cluster add-node 127.0.0.4:7002 127.0.0.1:700

redis-cli -c -h 192.168.8.196 -p 5008

cluster replicate 1f42f45cd136239d95fc15bda9938821c33138cc

./redis-cli --cluster reshard 127.0.0.5:7002

How many slots do you want to move (from 1 to 16384)? 4096

#它提示我們需要遷移多少slot到7007上，我們平分16384個(gè)哈希槽給4個(gè)節(jié)點(diǎn)：16384/4 = 4096，我們需要移動(dòng)4096個(gè)槽點(diǎn)到7007上。
#ps:這里分配可以根據(jù)你新增的節(jié)點(diǎn)內(nèi)存和已存在的節(jié)點(diǎn)進(jìn)行考慮，新增節(jié)點(diǎn)內(nèi)存大可以相對(duì)分配的多點(diǎn)

What is the receiving node ID? 63aa476d990dfa9f5f40eeeaa0315e7f9948554d
#這里添加接收節(jié)點(diǎn)的ID，我們填寫127.0.0.5:7002服務(wù)節(jié)點(diǎn)的ID
1.Please enter all the source node IDs.
2.Type ‘a(chǎn)ll' to use all the nodes as source nodes for the hash slots.
3.Type ‘done' once you entered all the source nodes IDs.
4.Source node #1: 
#redis-trib 會(huì)向你詢問重新分片的源節(jié)點(diǎn)（source node），即，要從特點(diǎn)的哪個(gè)節(jié)點(diǎn)中取出 4096 個(gè)哈希槽，還是從全部節(jié)點(diǎn)提取4096個(gè)哈希槽， 并將這些槽移動(dòng)到7007節(jié)點(diǎn)上面。
#如果我們不打算從特定的節(jié)點(diǎn)上取出指定數(shù)量的哈希槽，那么可以向redis-trib輸入 all，這樣的話， 集群中的所有主節(jié)點(diǎn)都會(huì)成為源節(jié)點(diǎn)，redis-trib從各個(gè)源節(jié)點(diǎn)中各取出一部分哈希槽，湊夠4096個(gè)，然后移動(dòng)到7007節(jié)點(diǎn)上：
1.Source node #1:all  
然后開始從別的主節(jié)點(diǎn)遷移哈希槽，并且確認(rèn)。
....省略分配內(nèi)容
1.Do you want to proceed with the proposed reshard plan (yes/no)? yes 
#注意這里一定要輸入yes，輸入Y或者其他會(huì)終止操作。 
#確認(rèn)之后，redis-trib就開始執(zhí)行分片操作，將哈希槽一個(gè)一個(gè)從源主節(jié)點(diǎn)移動(dòng)到127.0.0.5:7002目標(biāo)主節(jié)點(diǎn)。

./redis-trib.rb check 127.0.0.1:7001
...省略節(jié)點(diǎn)內(nèi)容
#可以看到7007節(jié)點(diǎn)分片的哈希槽片不是連續(xù)的，間隔的移動(dòng)。

./redis-cli --cluster del-node 127.0.0.6 3bc21c09f3318342600205b1b5e6ea129e3608f3

./redis-cli --cluster reshard 127.0.0.5:7002

1、How many slots do you want to move (from 1 to 16384)? 4461
2、What is the receiving node ID? b7e55a3d3eda2777c077c606c090bcfaf6b674fd
#這一步是問要將這些slot槽分配到哪個(gè)節(jié)點(diǎn)上，我分配到了127.0.0.1:7002上，所以填寫它的ID
3、Please enter all the source node IDs.
  3.1、Type 'all' to use all the nodes as source nodes for the hash slots.
  3.2、Type 'done' once you entered all the source nodes IDs.
3.3、Source node #1:
#這里需要數(shù)據(jù)源，其實(shí)就是 127.0.0.5:7002 節(jié)點(diǎn)的ID，因?yàn)槟闶前?7002 節(jié)點(diǎn)的數(shù)據(jù)放到其它地方去， 輸入 7002 的ID
#回車之后會(huì)出現(xiàn)再次輸入id
#其實(shí)是讓你還可以選擇源節(jié)點(diǎn)，但是我這里只要把 7002 節(jié)點(diǎn)分到其它地方就行，如果沒有再把其它主節(jié)點(diǎn)分?jǐn)偟男枰?，此處輸?done即可，否則輸入其它節(jié)點(diǎn)的ID，最后輸入 done
4.Do you want to proceed with the proposed reshard plan (yes/no)? yes 
#注意這里一定要輸入yes，輸入Y或者其他會(huì)終止操作。 
#這里就分配完slot槽了

./redis-cli --cluster del-node 127.0.0.6 主節(jié)點(diǎn)ID

redis 127.0.0.1:7002> config get maxmemory
1) "maxmemory"
2) "5000000000"

redis 127.0.0.1:6379> config set maxmemory 10G
OK
#其實(shí)set 10G是不規(guī)范的，最好的是換算下填寫10737418240

redis 127.0.0.1:6379> CONFIG GET maxmemory
1) "maxmemory"
2) "10000000000"

127.0.0.1:6379> CONFIG GET *
 1) "dbfilename"
  2) "dump.rdb"
  3) "requirepass"
  4) "123456"
  5) "masterauth"
  6) ""
  7) "unixsocket"
  8) ""
  9) "logfile"
 10) "/diskc/redis-2.8.19/log/6379_slave.log"
 11) "pidfile"
 12) "/var/run/redis.pid"
 13) "maxmemory"
 14) "10000000000"
 15) "maxmemory-samples"
 16) "3"
 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) "100000"
 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) "15000"
 65) "watchdog-period"
 66) "200"
 67) "slave-priority"
 68) "100"
 69) "min-slaves-to-write"
 70) "0"
 71) "min-slaves-max-lag"
 72) "10"
 73) "hz"
 74) "10"
 75) "repl-diskless-sync-delay"
 76) "5"
 77) "no-appendfsync-on-rewrite"
 78) "no"
 79) "slave-serve-stale-data"
 80) "yes"
 81) "slave-read-only"
 82) "yes"
 83) "stop-writes-on-bgsave-error"
 84) "yes"
 85) "daemonize"
 86) "yes"
 87) "rdbcompression"
 88) "yes"
 89) "rdbchecksum"
 90) "yes"
 91) "activerehashing"
 92) "yes"
 93) "repl-disable-tcp-nodelay"
 94) "no"
 95) "repl-diskless-sync"
 96) "no"
 97) "aof-rewrite-incremental-fsync"
 98) "yes"
 99) "aof-load-truncated"
100) "yes"
101) "appendonly"
102) "no"
103) "dir"
104) "/diskc/redis-2.8.19"
105) "maxmemory-policy"
106) "volatile-lru"
107) "appendfsync"
108) "everysec"
109) "save"
110) "900 1 300 10 60 10000"
111) "loglevel"
112) "notice"
113) "client-output-buffer-limit"
114) "normal 0 0 0 slave 268435456 67108864 60 pubsub 33554432 8388608 60"
115) "unixsocketperm"
116) "0"
117) "slaveof"
118) ""
119) "notify-keyspace-events"
120) ""
121) "bind"
122) ""