必會(huì)Redis單節(jié)點(diǎn)、Sentinel和Cluster操作實(shí)戰(zhàn)
[導(dǎo)讀]本篇文章講述了Redis單機(jī)環(huán)境、主備、哨兵Sentinel模式以及RedisCluster集群模式下的操作步驟，關(guān)于這些操作我們沒(méi)必要死記硬背，只需要總結(jié)下來(lái)，下次使用直接拿出來(lái)就好。建議當(dāng)作操作手冊(cè)收藏。安裝單實(shí)例Redis編譯Redis1.下載Redis源碼包wgethtt...
本篇文章講述了 Redis 單機(jī)環(huán)境、主備、哨兵 Sentinel 模式以及 Redis Cluster 集群模式下的操作步驟，關(guān)于這些操作我們沒(méi)必要死記硬背，只需要總結(jié)下來(lái)，下次使用直接拿出來(lái)就好。
建議當(dāng)作操作手冊(cè)收藏。
7.6381變化：6379變化：?4.設(shè)置 sentinel 成功2.選舉6380為新的主節(jié)點(diǎn)3.此時(shí)重啟6379節(jié)點(diǎn)?其中一個(gè)sentinel輸出如下
4.創(chuàng)建集群完成，客戶端鏈接校驗(yàn)redis-cli -c -p 30001?如果發(fā)生了自動(dòng)重定向，則表示RedisCluster使用正常
3.再選擇需要從哪些節(jié)點(diǎn)移出槽位4.最后輸入done，然后yes確定5.檢查移動(dòng)后的結(jié)果 redis-cli --cluster info 127.0.0.1:30001
建議當(dāng)作操作手冊(cè)收藏。
安裝單實(shí)例 Redis
編譯Redis
1.下載Redis源碼包wget https://download.redis.io/releases/redis-5.0.13.tar.gz2.解壓文件tar -zxvf redis-5.0.13.tar.gz3.cd redis-5.0.134.make?編譯1.如果遇到以下報(bào)錯(cuò)，需要安裝依賴?此時(shí)編譯完成，文件目錄下已經(jīng)生成可執(zhí)行文件。yum install gcc
而且libc 并不是默認(rèn)的 分配器， 默認(rèn)的是 jemalloc, 因?yàn)?jemalloc 被證明 有更少的 fragmentation problems 比libc。但是如果你又沒(méi)有jemalloc 而只有 libc 當(dāng)然 make 出錯(cuò)。所以加這么一個(gè)參數(shù),運(yùn)行如下命令：make MALLOC=libc
安裝Redis服務(wù)
1.安裝編譯后的文件make install PREFIX=/usr/local/redis52.編輯環(huán)境變量vi /etc/profile3.追加如下信息export REDIS_HOME=/usr/local/redis5export PATH=$PATH:$REDIS_HOME/bin4.更新配置source /etc/profileecho $PATH檢查環(huán)境變量是否正確5.
cd utils/6.安裝服務(wù)./install_server.sh然后出現(xiàn)如下輸出[root@node1 utils]# ./install_server.sh Welcome to the redis service installerThis script will help you easily set up a running redis server
Please select the redis port for this instance: [6379] 選擇啟動(dòng)端口Selecting default: 6379Please select the redis config file name [/etc/redis/6379.conf] 設(shè)置配置文件目錄Selected default - /etc/redis/6379.confPlease select the redis log file name [/var/log/redis_6379.log] 設(shè)置日志目錄Selected default - /var/log/redis_6379.logPlease select the data directory for this instance [/var/lib/redis/6379] 設(shè)置數(shù)據(jù)庫(kù)目錄Selected default - /var/lib/redis/6379Please select the redis executable path [/usr/local/redis5/bin/redis-server] 設(shè)置可執(zhí)行文件目錄Selected config:Port : 6379Config file : /etc/redis/6379.confLog file : /var/log/redis_6379.logData dir : /var/lib/redis/6379Executable : /usr/local/redis5/bin/redis-serverCli Executable : /usr/local/redis5/bin/redis-cliIs this ok? Then press ENTER to go on or Ctrl-C to abort.Copied /tmp/6379.conf => /etc/init.d/redis_6379 復(fù)制配置文件Installing service... 安裝服務(wù)Successfully added to chkconfig! 設(shè)置開(kāi)機(jī)啟動(dòng)Successfully added to runlevels 345!Starting Redis server... 啟動(dòng)服務(wù)Installation successful!7.
service redis_6379 status?檢查是否安裝成功ps -ef|grep redis?檢查正在運(yùn)行的服務(wù)配置修改
1.修改 配置信息vi /etc/redis/6379.conf?（這一步可選）daemonize no # 前臺(tái)方式運(yùn)行 為了方便觀察#logfile /var/log/redis_6379.log #注釋掉，前臺(tái)輸出 為了方便觀察appendonly yes # aof同步開(kāi)啟
redis-server /etc/redis/6379.conf3.啟動(dòng)客戶端?redis-cli -p 6379主備安裝
1.使用install_server.sh再安裝兩個(gè)Redis實(shí)例，使用端口號(hào)在同一機(jī)器區(qū)分 這里分別使用6379，6380，6381,并且分別啟動(dòng)2.登陸客戶端 redis-cli -p 63813.輸入命令 help SLAVEOF，6380端口實(shí)例操作同理。redis-cli -p 6381 127.0.0.1:6381>help SLAVEOFSLAVEOF host port summary: Make the server a replica of another instance, or promote it as master. Deprecated starting with Redis 5. Use REPLICAOF instead. since: 1.0.0 group: server
127.0.0.1:6381> REPLICAOF 127.0.0.1 6379 OK 127.0.0.1:6381>
REPLICAOF 127.0.0.1 63796381變化：6379變化：25692:S 03 Sep 2021 20:19:53.182 * REPLICAOF 127.0.0.1:6379 enabled (user request from 'id=3 addr=127.0.0.1:42336 fd=7 name= age=113 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=44 qbuf-free=32724 obl=0 oll=0 omem=0 events=r cmd=replicaof')25692:S 03 Sep 2021 20:19:54.146 * Connecting to MASTER 127.0.0.1:637925692:S 03 Sep 2021 20:19:54.146 * MASTER <-> REPLICA sync started25692:S 03 Sep 2021 20:19:54.146 * Non blocking connect for SYNC fired the event.25692:S 03 Sep 2021 20:19:54.147 * Master replied to PING, replication can continue...25692:S 03 Sep 2021 20:19:54.147 * Trying a partial resynchronization (request 839fc4e0817f7c98e9fa8204c53aedf661c71bf1:1).25692:S 03 Sep 2021 20:19:54.148 * Full resync from master: 4cff4bffe3e33adcca1864de53064480eb00c200:025692:S 03 Sep 2021 20:19:54.148 * Discarding previously cached master state.25692:S 03 Sep 2021 20:19:54.251 * MASTER <-> REPLICA sync: receiving 176 bytes from master25692:S 03 Sep 2021 20:19:54.254 * MASTER <-> REPLICA sync: Flushing old data # 會(huì)先刪除本節(jié)點(diǎn)老數(shù)據(jù)25692:S 03 Sep 2021 20:19:54.254 * MASTER <-> REPLICA sync: Loading DB in memory25692:S 03 Sep 2021 20:19:54.254 * MASTER <-> REPLICA sync: Finished with success
如果一個(gè)節(jié)點(diǎn)首次追隨主節(jié)點(diǎn)，會(huì)執(zhí)行RDB同步 如果從節(jié)點(diǎn)掛掉，啟動(dòng)直接追隨先前的主節(jié)點(diǎn)，只做增量同步 但是如果節(jié)點(diǎn)掛掉，啟動(dòng)直接追隨先前的主節(jié)點(diǎn)，同步方式為AOF，則會(huì)做RDB全量同步。?？赡苁且?yàn)锳OF沒(méi)有記錄之前追隨過(guò)誰(shuí)取消追隨主節(jié)點(diǎn)：
REPLICAOF no one哨兵模式 Sentinel
配置 sentinel
1.從redis源碼目錄復(fù)制官網(wǎng)提供的配置文件cp /root/soft/redis-5.0.13/sentinel.conf /etc/redis/sentinel_26379.conf2.修改配置文件port 26379sentinel monitor mymaster 127.0.0.1 6379 23.啟動(dòng)sentinel實(shí)例redis-server /etc/redis/sentinel_26379.conf --sentinel?以此為例啟動(dòng)三臺(tái)?4.設(shè)置 sentinel 成功驗(yàn)證
1.此時(shí)殺死m(xù)aster 6379實(shí)例2.選舉6380為新的主節(jié)點(diǎn)3.此時(shí)重啟6379節(jié)點(diǎn)?redis-server /etc/redis/6379.conf其中一個(gè)sentinel輸出如下11035:X 04 Sep 2021 01:41:29.685 # -sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 638011035:X 04 Sep 2021 01:41:39.675 * convert-to-slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6380原有的主節(jié)點(diǎn)已經(jīng)切換為備用節(jié)點(diǎn) Redis Cluster
配置集群
1.查看Redis cluster相關(guān)命令 redis-cli --cluster help[root@node1 ~]# redis-cli --cluster helpCluster Manager Commands: create host1:port1 ... hostN:portN --cluster-replicas check host:port --cluster-search-multiple-owners info host:port fix host:port --cluster-search-multiple-owners reshard host:port --cluster-from --cluster-to --cluster-slots --cluster-yes --cluster-timeout --cluster-pipeline --cluster-replace rebalance host:port --cluster-weight <node1=w1...nodeN=wN> --cluster-use-empty-masters --cluster-timeout --cluster-simulate --cluster-pipeline --cluster-threshold --cluster-replace add-node new_host:new_port existing_host:existing_port --cluster-slave --cluster-master-id del-node host:port node_id call host:port command arg arg .. arg set-timeout host:port milliseconds import host:port --cluster-from --cluster-copy --cluster-replace2.分別啟動(dòng)每個(gè)Redis實(shí)例Redis 本身在Utils目錄下提供了單機(jī)部署 cluster demo 的util腳本，可以快速一鍵部署。cd /root/soft/redis-5.0.13/utils/create-clustervi create-cluster3.redis-cli --cluster create 127.0.0.1:30001 127.0.0.1:30002 127.0.0.1:30003 127.0.0.1:30004 127.0.0.1:30005 127.0.0.1:30006 --cluster-replicas 1# SettingsPORT=30000TIMEOUT=2000NODES=6 # 節(jié)點(diǎn)數(shù)REPLICAS=1 # 備用節(jié)點(diǎn)數(shù) 此配置為3主3從./create-cluster start 啟動(dòng)實(shí)例./create-cluster create
4.創(chuàng)建集群完成，客戶端鏈接校驗(yàn)redis-cli -c -p 30001
?如果發(fā)生了自動(dòng)重定向，則表示RedisCluster使用正常檢查Redis cluster狀態(tài)
1.redis-cli --cluster check 127.0.0.1:30001reshrad Redis槽位
1.redis-cli --cluster reshard 127.0.0.1:300012.然后按照提示操作，首先選擇要移動(dòng)的槽位數(shù)量，然后選擇接受節(jié)點(diǎn)3.再選擇需要從哪些節(jié)點(diǎn)移出槽位
4.最后輸入done，然后yes確定5.檢查移動(dòng)后的結(jié)果 redis-cli --cluster info 127.0.0.1:30001
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