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搭建Redis集群具體步驟
Redis集群是一個由多個主從節(jié)點(diǎn)群組成的分布式服務(wù)集群，它具有復(fù)制、高可用和分片特性。Redis集群不需要sentinel哨兵也能完成節(jié)點(diǎn)移除和故障轉(zhuǎn)移的功能。需要將每個節(jié)點(diǎn)設(shè)置成集群模式，這種集群模式?jīng)]有中心節(jié)點(diǎn)，可水平擴(kuò)展，據(jù)官方文檔稱可以線性擴(kuò)展到上萬個節(jié)點(diǎn)(官方推薦不超過1000個節(jié)點(diǎn))。redis集群的性能和高可用性均優(yōu)于之前版本的哨兵模式，且集群配置非常簡單。
成都創(chuàng)新互聯(lián)專業(yè)IDC數(shù)據(jù)服務(wù)器托管提供商，專業(yè)提供成都服務(wù)器托管，服務(wù)器租用，成都服務(wù)器托管，成都服務(wù)器托管，成都多線服務(wù)器托管等服務(wù)器托管服務(wù)。
搭建環(huán)境
系統(tǒng)：centos7.4
服務(wù)器金山云
安裝ruby環(huán)境
[root@jsy-bj-test00 ~]# yum install -y ruby rubygems
復(fù)制6份redis服務(wù)
[work@jsy-bj-test00 ~]$ cp -rp redis redis1
[work@jsy-bj-test00 ~]$ cp -rp redis redis2
[work@jsy-bj-test00 ~]$ cp -rp redis redis3
redis配置文件修改
#六個節(jié)點(diǎn)需做如下更改
[work@jsy-bj-test00 ~]$ vim redis1/etc/redis.conf
[work@jsy-bj-test00 ~]$ sed -i 's/port 6379/port 6380/g' redis5/etc/redis.conf #修改端口 port 6380
#打開注釋，開啟集群模式
cluster-enabled yes
#集群的配置文件
cluster-config-file nodes-6380.conf
[work@jsy-bj-test00 ~]$ sed -i 's/cluster-config-file nodes-6379.conf/cluster-config-file nodes-6380.conf/g' redis5/etc/redis.conf
#pidfile文件
pidfile /var/run/redis_6380.pid
[work@jsy-bj-test00 ~]$ sed -i 's/pidfile \/var\/run\/redis_6380.pid/pidfile \/var\/run\/redis_6380.pid/g' redis5/etc/redis.conf
#日志文件
logfile "/home/work/logs/redis/6380.log"
[work@jsy-bj-test00 ~]$ sed -i 's/logfile "\/home\/work\/logs\/redis\/6379.log"/logfile "\/home\/work\/logs\/redis\/6380.log"/g' redis5/etc/redis.conf
#rdb持久化文件
dbfilename dump6380.rdb
[work@jsy-bj-test00 ~]$ sed -i 's/dbfilename dump6379.rdb/dbfilename dump6380.rdb/g' redis5/etc/redis.conf
#請求超時(shí)，單位毫秒
cluster-node-timeout 5000
#開啟aof持久化方式
appendonly yes
#配置持久化文件
appendfilename "appendonly6379.aof"
[work@jsy-bj-test00 ~]$ sed -i 's/appendfilename "appendonly6379.aof"/appendfilename "appendonly6383.aof"/g' redis5/etc/redis.conf
編寫集群啟動腳本和停止腳本
啟動腳本start_all.sh
/home/work/redis/bin/redis-server /home/work/redis/etc/redis.conf &
/home/work/redis/bin/redis-server /home/work/redis/etc/redis6380.conf &
/home/work/redis/bin/redis-server /home/work/redis/etc/redis6381.conf &
/home/work/redis/bin/redis-server /home/work/redis/etc/redis6382.conf &
/home/work/redis/bin/redis-server /home/work/redis/etc/redis6383.conf &
/home/work/redis/bin/redis-server /home/work/redis/etc/redis6384.conf &
關(guān)閉腳本stop_all.sh
/home/work/redis/bin/redis-cli -p 6379 -a test shutdown
/home/work/redis/bin/redis-cli -p 6380 -a test shutdown
/home/work/redis/bin/redis-cli -p 6381 -a test shutdown
/home/work/redis/bin/redis-cli -p 6382 -a test shutdown
/home/work/redis/bin/redis-cli -p 6383 -a test shutdown
/home/work/redis/bin/redis-cli -p 6384 -a test shutdown
執(zhí)行創(chuàng)建集群命令
有如下報(bào)錯
[work@jsy-bj-test00 src]$ ./redis-trib.rb create --replicas 1 127.0.0.1:6379 127.0.0.1:6380 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384
/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- redis (LoadError) from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require'
from ./redis-trib.rb:25:in `
‘
原因：安裝redis接口報(bào)錯ruby版本過低
[root@jsy-bj-test00 ~]# gem install redis
Fetching: redis-4.1.3.gem (100%)
ERROR: Error installing redis:
redis requires Ruby version >= 2.3.0.
解決辦法到官網(wǎng)下載最新穩(wěn)定版源代碼 http://www.ruby-lang.org/en/downloads/ 進(jìn)行編譯安裝
[work@jsy-bj-test00 soft]$ tar zxvf ruby-2.7.0.tar.gz
[work@jsy-bj-test00 soft]$ cd ruby-2.7.0
[work@jsy-bj-test00 ruby-2.7.0]$ ./configure --prefix=/home/work/ruby && make && make install
安裝redis接口
[work@jsy-bj-test00 bin]$ gem install redis
再次執(zhí)行創(chuàng)建集群命令
[work@jsy-bj-test00 src]$ ./redis-trib.rb create --replicas 1 127.0.0.1:6379 127.0.0.1:6380 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
......
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join...
>>> Performing Cluster Check (using node 127.0.0.1:6379)
......
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
創(chuàng)建成功,查看集群狀態(tài)
[work@jsy-bj-test00 ~]$ ./redis/bin/redis-cli -h 127.0.0.1 -p 6379 -c
127.0.0.1:6379> cluster info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_sent:627
cluster_stats_messages_received:627
查看集群節(jié)點(diǎn)信息
127.0.0.1:6379> cluster nodes
565246bf31d8e05e464db7455521b1a9f165a9cd 127.0.0.1:6380 master - 0 1578447776230 2 connected 5461-10922
1b99b2a1e4b530501476ab48422c75f30423fd19 127.0.0.1:6383 slave 565246bf31d8e05e464db7455521b1a9f165a9cd 0 1578447778233 5 connected
735ad5778458059316794b9378d4b81aaff20322 127.0.0.1:6379 myself,master - 0 0 1 connected 0-5460
757c2c11ecebfc607aa10a6877e348d0e2da484f 127.0.0.1:6381 master - 0 1578447777732 3 connected 10923-16383
f22efc2bcfcd11cee6487ebc9c75de3b59f5e1d0 127.0.0.1:6382 slave 735ad5778458059316794b9378d4b81aaff20322 0 1578447776230 4 connected
b8bba94b9647caa8600363144fd7108082e45f56 127.0.0.1:6384 slave 757c2c11ecebfc607aa10a6877e348d0e2da484f 0 1578447777232 6 connected
#這是很重要的命令，我們需要關(guān)心的信息有：
#第一個參數(shù)：節(jié)點(diǎn)ID
#第二個參數(shù)：IP:PORT@TCP 這里一個坑，jedis-2.9.0之前的版本解析@出錯
#第三個參數(shù)：標(biāo)志（Master，Slave，Myself，F(xiàn)ail...）
#第四個參數(shù)：如果是從機(jī)則是主機(jī)的節(jié)點(diǎn)ID
#最后兩個參數(shù)：連接的狀態(tài)和槽的位置。
集群管理相關(guān)命令
#集群增加節(jié)點(diǎn)，先復(fù)制兩個配置文件，并修改配置文件內(nèi)容
[work@jsy-bj-test00 etc]$ cp -p redis.conf redis6385.conf
[work@jsy-bj-test00 etc]$ cp -p redis.conf redis6386.conf
[work@jsy-bj-test00 etc]$ sed -i 's/6379/6385/g' redis6385.conf
[work@jsy-bj-test00 etc]$ sed -i 's/6379/6386/g' redis6386.conf
啟動6385節(jié)點(diǎn)
[work@jsy-bj-test00 bin]$ ./redis-server /home/work/redis/etc/redis6385.conf &
將集群管理工具軟連到redis的bin下
[work@jsy-bj-test00 bin]$ ln -s /home/work/soft/redis-3.2.11/src/redis-trib.rb /home/work/redis/bin/redis-trib.rb
將新節(jié)點(diǎn)加入集群master
[work@jsy-bj-test00 bin]$ ./redis-trib.rb add-node 127.0.0.1:6385 127.0.0.1:6379
>>> Adding node 127.0.0.1:6385 to cluster 127.0.0.1:6379
>>> Performing Cluster Check (using node 127.0.0.1:6379)
......
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 127.0.0.1:6385 to make it join the cluster.
[OK] New node added correctly.
查看集群狀態(tài)，未分配槽位
[work@jsy-bj-test00 bin]$ ./redis-cli -h 127.0.0.1 -p 6379 -c cluster nodes
d00d05f601df0b69df0c2cc532b636d2c83347be 127.0.0.1:6385 master - 0 1578450280191 0 connected
給6385節(jié)點(diǎn)分配槽位
[work@jsy-bj-test00 bin]$ ./redis-trib.rb reshard 127.0.0.1:6379
>>> Performing Cluster Check (using node 127.0.0.1:6379)
......
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
How many slots do you want to move (from 1 to 16384)? 500
What is the receiving node ID? d00d05f601df0b69df0c2cc532b636d2c83347be
Please enter all the source node IDs.
Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes IDs.
Source node #1:all
Do you want to proceed with the proposed reshard plan (yes/no)? yes
#第一個參數(shù)：需要移動槽的個數(shù)，
#第二個參數(shù)：接受槽的節(jié)點(diǎn)ID，
#第三個參數(shù)：輸入"all"表示從所有原節(jié)點(diǎn)中獲取槽，
#第四個參數(shù)：輸入"yes"開始移動槽到目標(biāo)結(jié)點(diǎn)id
#查看6385節(jié)點(diǎn)信息，已經(jīng)分配槽位
[work@jsy-bj-test00 bin]$ ./redis-cli -h 127.0.0.1 -p 6379 -c cluster nodes
d00d05f601df0b69df0c2cc532b636d2c83347be 127.0.0.1:6385 master - 0 1578452422167 7 connected 0-165 5461-5627 10923-11088
添加從節(jié)點(diǎn)，啟動6386節(jié)點(diǎn)并加入集群
[work@jsy-bj-test00 bin]$ ./redis-server /home/work/redis/etc/redis6386.conf &
[work@jsy-bj-test00 bin]$ ./redis-trib.rb add-node --slave --master-id d00d05f601df0b69df0c2cc532b636d2c83347be 127.0.0.1:6386 127.0.0.1:6385
>>> Adding node 127.0.0.1:6386 to cluster 127.0.0.1:6385
>>> Performing Cluster Check (using node 127.0.0.1:6385)
......
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 127.0.0.1:6386 to make it join the cluster.
Waiting for the cluster to join.
>>> Configure node as replica of 127.0.0.1:6385.
[OK] New node added correctly.
查看6386節(jié)點(diǎn)狀態(tài)
[work@jsy-bj-test00 bin]$ ./redis-cli -h 127.0.0.1 -p 6379 -c cluster nodes
6845878cbef3fe25f19a70a8db3eb29abb1b9ea6 127.0.0.1:6386 slave d00d05f601df0b69df0c2cc532b636d2c83347be 0 1578452805439 7 connected
刪除節(jié)點(diǎn)
[work@jsy-bj-test00 bin]$ ./redis-trib.rb del-node 127.0.0.1:6383 1b99b2a1e4b530501476ab48422c75f30423fd19
>>> Removing node 1b99b2a1e4b530501476ab48422c75f30423fd19 from cluster 127.0.0.1:6383
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
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