環(huán)境準(zhǔn)備
虛擬機(jī)系統(tǒng)地址: http://mirrors.aliyun.com/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-2009.iso
安裝時(shí)選擇最小安裝
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使用virtual box安裝完成后的虛擬機(jī)版本
[root@localhost ~]# cat /etc/centos-release CentOS Linux release 7.9.2009 (Core) -
設(shè)置虛擬機(jī)端口轉(zhuǎn)發(fā)
宿主機(jī):虛擬機(jī)
- 18022:22
- 7001:7001
- 7002:7002
- 7003:7003
- 7004:7004
- 7005:7005
- 7006:7006
redis集群間會(huì)通過對(duì)應(yīng)的ip進(jìn)行連接，如果端口轉(zhuǎn)發(fā)設(shè)置了17001:7001,那么 外部連接17001能夠連到單機(jī)，但是外部客戶端獲取的集群信息將會(huì)是虛擬機(jī)中真實(shí)的端口(如7002),此時(shí)外部的客戶端將會(huì)通過集群連接7002，但是7002在宿主機(jī)中沒有做端口映射，導(dǎo)致連接失敗
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虛擬機(jī)用戶
root用戶: root/root
redis用戶: redis/1qaz2wsx
redis已開啟密碼驗(yàn)證:
1qaz2wsx
本例中常用命令行
docker ps -a #查看所有的容器
docker ps #查看運(yùn)行中的容器
docker stop container_id #停止指定id的容器,多個(gè)以逗號(hào)分隔
docker start container_id #開啟容器,多個(gè)以逗號(hào)分隔
docker restart container_id #重啟容器,多個(gè)以逗號(hào)分隔
docker rm container_id #刪除容器,多個(gè)以逗號(hào)分隔
docker exec -it container_id /bin/bash #進(jìn)入容器，并繼續(xù)bash命令行交互
#批量停止
docker stop `docker ps | awk 'NR!=1{print $1}'`
#批量啟動(dòng)(只啟動(dòng)redis)
docker restart `docker ps -a | grep redis- | awk '{print $1}'`
docker exec -it redis-master1 /bin/bash #進(jìn)入容器
#進(jìn)入redis-cli控制臺(tái)
redis-cli -h 127.0.0.1 -p 7001 -a 1qaz2wsx
# 以下命令在redis控制臺(tái)中執(zhí)行
cluster nodes #集群節(jié)點(diǎn)信息
cluster info #集群狀態(tài)
docker安裝
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執(zhí)行命令查詢可安裝的docker版本
[root@localhost ~]# yum list docker-ce --showduplicates | sort -r此處選擇了
18.06.3-ce[root@localhost ~]# yum install docker-ce-18.06.3-ce安裝后加入開機(jī)啟動(dòng)服務(wù)
[root@localhost ~]# systemctl start docker [root@localhost ~]# systemctl enable docker查看
docker信息[root@localhost ~]# docker version Client: Version: 18.06.3-ce API version: 1.38 Go version: go1.10.3 Git commit: d7080c1 Built: Wed Feb 20 02:26:51 2019 OS/Arch: linux/amd64 Experimental: false Server: Engine: Version: 18.06.3-ce API version: 1.38 (minimum version 1.12) Go version: go1.10.3 Git commit: d7080c1 Built: Wed Feb 20 02:28:17 2019 OS/Arch: linux/amd64 Experimental: false
docker-compose安裝
構(gòu)建
redis集群使用了docker-compose命令。
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下載docker-compose并安裝
[root@localhost ~]# cd /usr/local/bin/ [root@localhost bin]# wget https://github.com/docker/compose/releases/download/v2.3.1/docker-compose-linux-x86_64注意此處文件的目錄在
/usr/local/bin/中這里建議直接在外部下載好后ftp上傳到虛擬機(jī)中
v2.3.1可以根據(jù)需要自己到
github上更換版本重命名下載下來的文件包并賦予權(quán)限，完成后查看版本信息
[root@localhost ~]# cd /usr/local/bin/ [root@localhost bin]# rename docker-compose-linux-x86_64 docker-compose docker-compose-linux-x86_64 [root@localhost bin]# chmod +x /usr/local/bin/docker-compose [root@localhost bin]# docker-compose --version Docker Compose version v2.3.1
docker中拉取redis鏡像
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在https://hub.docker.com/_/redis?tab=tags上找到自己需要的
redis鏡像版本這里選擇了redis:6.2.6版本
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拉取鏡像并查看
[root@localhost ~]# docker pull redis:6.2.6 [root@localhost ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE redis 6.2.6 0e403e3816e8 5 days ago 113MB -
創(chuàng)建docker容器和虛擬機(jī)間的映射目錄(目錄位置可隨意)
本例中由于新建了
redis用戶，所以/home目錄下已經(jīng)存在/redis目錄了- 在
/home/redis/redis-config目錄下新建6個(gè)節(jié)點(diǎn)配置目錄(redis-config需要自己新建)
[redis@localhost redis-config]$ mkdir 700{1..6} [redis@localhost redis-config]$ ls 7001 7002 7003 7004 7005 7006 - 在
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為每個(gè)節(jié)點(diǎn)準(zhǔn)備配置文件(每個(gè)節(jié)點(diǎn)目錄各copy一份)
port 7001 protected-mode no # 關(guān)閉保護(hù)模式,容許無密碼連接 bind 0.0.0.0 # 綁定0.0.0.0,或者注釋此項(xiàng)，容許任意ip連接 daemonize no # 關(guān)閉守護(hù)進(jìn)程 appendonly yes # 開啟AOF持久化 requirepass 1qaz2wsx # 本機(jī)密碼-與主節(jié)點(diǎn)密碼一致,否則無法自動(dòng)切換主從 masterauth 1qaz2wsx # 主節(jié)點(diǎn)密碼 cluster-enabled yes # 開啟 cluster集群 cluster-config-file 7001.conf #實(shí)際文件為node-7001.conf,程序自動(dòng)會(huì)生成 cluster-node-timeout 10000 # 集群超時(shí)(ms) cluster-announce-port 7001 # 集群節(jié)點(diǎn)映射端口號(hào) cluster-announce-bus-port 17001 # 集群節(jié)點(diǎn)總線端口號(hào)配置中
port、cluster-config-file、cluster-announce-port、cluster-announce-bus-port四項(xiàng)配置需要在copy過程中根據(jù)端口號(hào)修改更多設(shè)置參考
redis官網(wǎng)的配置最終目錄結(jié)構(gòu)如下(此步驟只要關(guān)注7001-7006幾個(gè)文件夾即可)
[root@localhost redis-config]# ls 7001 7003 7005 cluster.tmpl redis.conf 7002 7004 7006 docker-compose.yml -
設(shè)置防火墻，開啟7001-7006的端口，開啟后重啟防火墻
[root@localhost redis-config]# firewall-cmd --zone=public --add-port=7001-7006/tcp --permanent [root@localhost redis-config]# firewall-cmd --reload [root@localhost redis-config]# firewall-cmd --list-ports 7001-7006/tcp -
在
/home/redis/redis-config下創(chuàng)建docker-compose.yml內(nèi)容如下:注意,該yaml文件中指定了容器以host模式啟動(dòng),會(huì)使用宿主虛擬機(jī)的host地址和端口,這樣外部設(shè)置了端口轉(zhuǎn)發(fā)后可以直接訪問到容器
network_mode: hostversion: "3.7" services: redis-master1: image: redis:6.2.6 # 基礎(chǔ)鏡像 container_name: redis-master1 # 容器服務(wù)名 restart: always # docker重啟時(shí)容器也重啟,由于docker設(shè)置開機(jī)自啟，實(shí)際設(shè)置后并沒有成功啟動(dòng),解決方案是添加了開機(jī)腳本自動(dòng)執(zhí)行重啟 environment: # 環(huán)境變量 - PORT=7001 # 跟 config/nodes-7001.conf 里的配置一樣的端口 - TZ=Asia/Shanghai # 時(shí)區(qū)設(shè)置為上海 network_mode: host # 使用docker宿主IP ports: # 映射端口，對(duì)外提供服務(wù) - "7001:7001" # redis 的服務(wù)端口 - "17001:17001" # redis 集群監(jiān)控端口 stdin_open: true # 標(biāo)準(zhǔn)輸入打開 tty: true privileged: true # 擁有容器內(nèi)命令執(zhí)行的權(quán)限 volumes: # 數(shù)據(jù)卷，目錄掛載 host:container的文件映射關(guān)系-容器啟動(dòng)后讀取的配置的host中的映射路徑文件，然后被加載進(jìn)/data的映射目錄中 - /home/redis/redis-config/7001/nodes-7001.conf:/etc/redis/redis.conf - /home/redis/redis-config/7001/data:/data command: ["redis-server", "/etc/redis/redis.conf"] # 覆蓋容器啟動(dòng)后默認(rèn)執(zhí)行的命令 redis-master2: image: redis:6.2.6 container_name: redis-master2 restart: always environment: - PORT=7002 - TZ=Asia/Shanghai network_mode: host ports: - "7002:7002" - "17002:17002" stdin_open: true tty: true privileged: true volumes: - /home/redis/redis-config/7002/nodes-7002.conf:/etc/redis/redis.conf - /home/redis/redis-config/7002/data:/data command: ["redis-server", "/etc/redis/redis.conf"] redis-master3: image: redis:6.2.6 container_name: redis-master3 restart: always environment: - PORT=7003 - TZ=Asia/Shanghai network_mode: host ports: - "7003:7003" - "17003:17003" stdin_open: true tty: true privileged: true volumes: - /home/redis/redis-config/7003/nodes-7003.conf:/etc/redis/redis.conf - /home/redis/redis-config/7003/data:/data command: ["redis-server", "/etc/redis/redis.conf"] redis-slave1: image: redis:6.2.6 container_name: redis-slave1 restart: always environment: - PORT=7004 network_mode: host ports: - "7004:7004" - "17004:17004" stdin_open: true tty: true privileged: true volumes: - /home/redis/redis-config/7004/nodes-7004.conf:/etc/redis/redis.conf - /home/redis/redis-config/7004/data:/data command: ["redis-server", "/etc/redis/redis.conf"] redis-slave2: image: redis:6.2.6 container_name: redis-salve2 restart: always environment: - PORT=7005 network_mode: host ports: - "7005:7005" - "17005:17005" stdin_open: true tty: true privileged: true volumes: - /home/redis/redis-config/7005/nodes-7005.conf:/etc/redis/redis.conf - /home/redis/redis-config/7005/data:/data command: ["redis-server", "/etc/redis/redis.conf"] redis-slave3: image: redis:6.2.6 container_name: redis-slave3 restart: always environment: - PORT=7006 network_mode: host ports: - "7006:7006" - "17006:17006" stdin_open: true tty: true privileged: true volumes: - /home/redis/redis-config/7006/nodes-7006.conf:/etc/redis/redis.conf - /home/redis/redis-config/7006/data:/data command: ["redis-server", "/etc/redis/redis.conf"]注意volumes配置很重要,該配置是指定虛擬機(jī)和docker容器間的文件映射關(guān)系
/home/redis/redis-config/7006/nodes-7006.conf:/etc/redis/redis.conf指的是把
/home/redis/redis-config/7006/nodes-7006.conf映射給/etc/redis/redis.conf，容器中的redis讀取的是默認(rèn)路徑下的配置文件。同理，后面的
/home/redis/redis-config/7006/data目錄是容器執(zhí)行時(shí)存儲(chǔ)的持久化文件的目錄，該目錄在虛擬機(jī)宿主中需要提前新建 -
在
/home/redis/redis-config下啟動(dòng)測試(容器狀態(tài)出錯(cuò)可以使用docker logs container_name查看log)在
docker-compose.yml同目錄下執(zhí)行docker-compose up -d將會(huì)開始啟動(dòng)容器[redis@localhost redis-config]$ sudo docker-compose up -d [+] Running 6/6 ? Container redis-slave3 Started 0.3s ? Container redis-master1 Running 0.0s ? Container redis-master2 Started 0.4s ? Container redis-master3 Started 0.4s ? Container redis-slave1 Started 0.3s ? Container redis-salve2 Started 0.3s [redis@localhost redis-config]$ sudo docker-compose ps NAME COMMAND SERVICE STATUS PORTS redis-master1 "docker-entrypoint.s…" redis-master1 running redis-master2 "docker-entrypoint.s…" redis-master2 running redis-master3 "docker-entrypoint.s…" redis-master3 running redis-salve2 "docker-entrypoint.s…" redis-slave2 running redis-slave1 "docker-entrypoint.s…" redis-slave1 running redis-slave3 "docker-entrypoint.s…" redis-slave3 running # 查看運(yùn)行l(wèi)og [redis@localhost redis-config]$sudo docker logs refis-master1 1:C 08 Mar 2022 17:40:43.824 # Redis version=6.2.6, bits=64, commit=00000000, modified=0, pid=1, just started 1:C 08 Mar 2022 17:40:43.824 # Configuration loaded 1:M 08 Mar 2022 17:40:43.824 * monotonic clock: POSIX clock_gettime 1:M 08 Mar 2022 17:40:43.825 * No cluster configuration found, I'm 493be565483b3731218b53121f323d27a15e3344 _._ _.-``__ ''-._ _.-`` `. `_. ''-._ Redis 6.2.6 (00000000/0) 64 bit .-`` .-```. ```\/ _.,_ ''-._ ( ' , .-` | `, ) Running in cluster mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 7001 | `-._ `._ / _.-' | PID: 1 `-._ `-._ `-./ _.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | https://redis.io `-._ `-._`-.__.-'_.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-' `-._ `-.__.-' _.-' `-._ _.-' `-.__.-' 1:M 08 Mar 2022 17:40:43.841 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128. 1:M 08 Mar 2022 17:40:43.841 # Server initialized 1:M 08 Mar 2022 17:40:43.841 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect. 1:M 08 Mar 2022 17:40:43.841 * Ready to accept connections [redis@localhost redis-config]$ -
開啟集群，任意進(jìn)入一個(gè)容器后查看信息
docker exec -it redis-master1 /bin/bash命令是進(jìn)入容器中redis-master1可以替換為你自己的容器名(docker ps可以查看運(yùn)行中的容器信息)[root@localhost redis-config]# docker exec -it redis-master1 /bin/bash #下面是redis容器中的操作了(exit命令退出) 容器中的redis被設(shè)定了7001的端口 #所以指定 7001進(jìn)入 root@localhost:/data# redis-cli -h 127.0.0.1 -p 7001 127.0.0.1:7001> auth 1qaz2wsx OK 127.0.0.1:7001> info replication # Replication role:master connected_slaves:0 master_failover_state:no-failover master_replid:9ea784e6649cbf622b095598cdfb5a0b0cf228c5 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:0 second_repl_offset:-1 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0 -
此時(shí)所有的容器都是
master,集群還未創(chuàng)建，先查看容器ip[root@localhost redis-config]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES aab2ec44ae45 redis:6.2.6 "docker-entrypoint.s…" About an hour ago Up 22 minutes redis-master2 b65fb2dbf322 redis:6.2.6 "docker-entrypoint.s…" About an hour ago Up 22 minutes redis-slave3 9bd201bd00d3 redis:6.2.6 "docker-entrypoint.s…" About an hour ago Up 22 minutes redis-slave1 130d9710f73c redis:6.2.6 "docker-entrypoint.s…" About an hour ago Up 22 minutes redis-master3 707733341de8 redis:6.2.6 "docker-entrypoint.s…" About an hour ago Up 22 minutes redis-salve2 d0327b5172f6 redis:6.2.6 "docker-entrypoint.s…" About an hour ago Up 22 minutes redis-master1根據(jù)容器id查詢IP
[root@localhost redis-config]# docker inspect aab2ec44ae45 b65fb2dbf322 9bd201bd00d3 130d9710f73c 707733341de8 d0327b5172f6 | grep IPA "SecondaryIPAddresses": null, "IPAddress": "", "IPAMConfig": null, "IPAddress": "", "SecondaryIPAddresses": null,由于使用host方式連接，所以此處ip可能為空，容器內(nèi)地址和宿主虛擬機(jī)共享，使用了同一網(wǎng)段，可認(rèn)為是127.0.0.1，同時(shí)容器內(nèi)的redis可以相互訪問
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創(chuàng)建集群(
--cluster-replicas 1代表一個(gè)主節(jié)點(diǎn)有一個(gè)從節(jié)點(diǎn))注意操作是在容器中直接執(zhí)行而不是進(jìn)入redis，注意添加-a 密碼認(rèn)證
在容器中使用
redis-cli命令root@localhost:/data# redis-cli --cluster create -a 1qaz2wsx 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006 --cluster-replicas 1 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. >>> Performing hash slots allocation on 6 nodes... Master[0] -> Slots 0 - 5460 Master[1] -> Slots 5461 - 10922 Master[2] -> Slots 10923 - 16383 Adding replica 127.0.0.1:7005 to 127.0.0.1:7001 Adding replica 127.0.0.1:7006 to 127.0.0.1:7002 Adding replica 127.0.0.1:7004 to 127.0.0.1:7003 >>> Trying to optimize slaves allocation for anti-affinity [WARNING] Some slaves are in the same host as their master M: 493be565483b3731218b53121f323d27a15e3344 127.0.0.1:7001 slots:[0-5460] (5461 slots) master M: cea65f3d0079aecf8e6e361ae61cc1330f28f241 127.0.0.1:7002 slots:[5461-10922] (5462 slots) master M: b6703deba75f2a6cca476a236262f95545e1e55a 127.0.0.1:7003 slots:[10923-16383] (5461 slots) master S: 527aec25c7221ab803571854ce7b4fdb67803b21 127.0.0.1:7004 replicates cea65f3d0079aecf8e6e361ae61cc1330f28f241 S: e5f66a3c8aa3dcad341f989d76eab924049d747c 127.0.0.1:7005 replicates b6703deba75f2a6cca476a236262f95545e1e55a S: 91a44195b75ada961be2687426b805342a459631 127.0.0.1:7006 replicates 493be565483b3731218b53121f323d27a15e3344 Can I set the above configuration? (type 'yes' to accept):yes >>> 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 127.0.0.1:7001) M: 493be565483b3731218b53121f323d27a15e3344 127.0.0.1:7001 slots:[0-5460] (5461 slots) master 1 additional replica(s) S: e5f66a3c8aa3dcad341f989d76eab924049d747c 127.0.0.1:7005 slots: (0 slots) slave replicates b6703deba75f2a6cca476a236262f95545e1e55a M: b6703deba75f2a6cca476a236262f95545e1e55a 127.0.0.1:7003 slots:[10923-16383] (5461 slots) master 1 additional replica(s) S: 91a44195b75ada961be2687426b805342a459631 127.0.0.1:7006 slots: (0 slots) slave replicates 493be565483b3731218b53121f323d27a15e3344 M: cea65f3d0079aecf8e6e361ae61cc1330f28f241 127.0.0.1:7002 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: 527aec25c7221ab803571854ce7b4fdb67803b21 127.0.0.1:7004 slots: (0 slots) slave replicates cea65f3d0079aecf8e6e361ae61cc1330f28f241 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.數(shù)據(jù)會(huì)自動(dòng)分片(
Slots)，集群一定是被分完了16383個(gè)槽才能正常運(yùn)行 -
測試集群
redis-cli -c -p 7006 --pass 1qaz2wsx使用
-c連接集群root@localhost:/data# redis-cli -c -p 7006 --pass 1qaz2wsx Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:7006> set tmq lyh -> Redirected to slot [5896] located at 127.0.0.1:7002 OK 127.0.0.1:7002>可以看到從7006從庫設(shè)值會(huì)自動(dòng)跳轉(zhuǎn)到合適的主庫(根據(jù)hash分片(
Slots)定位到對(duì)應(yīng)的主庫)關(guān)閉一個(gè)主節(jié)點(diǎn)后,從節(jié)點(diǎn)自動(dòng)升級(jí)為主節(jié)點(diǎn)
[root@localhost redis-config]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 2f65f6726eac redis:6.2.6 "docker-entrypoint.s…" 19 minutes ago Up 19 minutes redis-master3 0320ff7bb8be redis:6.2.6 "docker-entrypoint.s…" 19 minutes ago Up 19 minutes redis-master1 eb37d5d69286 redis:6.2.6 "docker-entrypoint.s…" 19 minutes ago Up 19 minutes redis-slave3 23c01b207843 redis:6.2.6 "docker-entrypoint.s…" 19 minutes ago Up 19 minutes redis-salve2 d38ce71d6642 redis:6.2.6 "docker-entrypoint.s…" 19 minutes ago Up 19 minutes redis-slave1 88be84a76769 redis:6.2.6 "docker-entrypoint.s…" 19 minutes ago Up 19 minutes redis-master2 [root@localhost redis-config]# docker stop 88be84a76769 #停止7002主節(jié)點(diǎn) 88be84a76769 [root@localhost redis-config]# docker exec -it redis-master1 /bin/bash root@localhost:/data# redis-cli -h 127.0.0.1 -p 7001 -a 1qaz2wsx 127.0.0.1:7001> cluster nodes #7002節(jié)點(diǎn)狀態(tài)為fail 39baee913bf54b477b76c391cdff029a00df4d82 127.0.0.1:7006@17006 slave c9f242c66084f411150091c991e948c7adeab813 0 1646749528647 1 connected c9f242c66084f411150091c991e948c7adeab813 127.0.0.1:7001@17001 myself,master - 0 1646749526000 1 connected 0-5460 ab48156e010439f300d182a2c97405f0284d2812 127.0.0.1:7005@17005 slave d30478df0a2e801eb479bad12507829af8bb066c 0 1646749527000 3 connected b261873db577925008b8aa860effae78c54ddb83 127.0.0.1:7002@17002 master,fail - 1646749487394 1646749484000 2 disconnected 588437eeb993168ac80da825b66a1d128fe9f422 127.0.0.1:7004@17004 master - 0 1646749528000 7 connected 5461-10922 d30478df0a2e801eb479bad12507829af8bb066c 127.0.0.1:7003@17003 master - 0 1646749528000 3 connected 10923-16383 127.0.0.1:7001> root@localhost:/data# redis-cli -c -p 7005 -a 1qaz2wsx Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:7005> set tws 111 #測試集群數(shù)據(jù) -> Redirected to slot [7154] located at 127.0.0.1:7004 OK 127.0.0.1:7004> root@localhost:/data# redis-cli -c -p 7001 -a 1qaz2wsx Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:7001> get tws -> Redirected to slot [7154] located at 127.0.0.1:7004 "111" 127.0.0.1:7004> root@localhost:/data# exit exit [root@localhost redis-config]# docker start 88be84a76769 #啟動(dòng)7002后 7002變?yōu)閺墓?jié)點(diǎn) 88be84a76769 [root@localhost redis-config]# docker exec -it redis-master1 /bin/bash root@localhost:/data# redis-cli -c -p 7001 -a 1qaz2wsx Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:7001> cluster nodes 39baee913bf54b477b76c391cdff029a00df4d82 127.0.0.1:7006@17006 slave c9f242c66084f411150091c991e948c7adeab813 0 1646749619151 1 connected c9f242c66084f411150091c991e948c7adeab813 127.0.0.1:7001@17001 myself,master - 0 1646749618000 1 connected 0-5460 ab48156e010439f300d182a2c97405f0284d2812 127.0.0.1:7005@17005 slave d30478df0a2e801eb479bad12507829af8bb066c 0 1646749618000 3 connected b261873db577925008b8aa860effae78c54ddb83 127.0.0.1:7002@17002 slave 588437eeb993168ac80da825b66a1d128fe9f422 0 1646749620156 7 connected 588437eeb993168ac80da825b66a1d128fe9f422 127.0.0.1:7004@17004 master - 0 1646749619000 7 connected 5461-10922 d30478df0a2e801eb479bad12507829af8bb066c 127.0.0.1:7003@17003 master - 0 1646749618147 3 connected 10923-16383 127.0.0.1:7001>關(guān)閉一個(gè)master后，一個(gè)從節(jié)點(diǎn)會(huì)提升為主節(jié)點(diǎn)，開啟關(guān)閉的主節(jié)點(diǎn)后，原先的主節(jié)點(diǎn)變成了從節(jié)點(diǎn)。
外部連接
外部客戶端直接連接上文設(shè)置的轉(zhuǎn)發(fā)端口即可。
redis集群在本例中配置了密碼:1qaz2wsx
相關(guān)問題
刪除集群
如果想刪除集群，需要先停止所有的容器,然后根據(jù)ID刪除
[root@localhost redis-config]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
69913c91e2dd redis:6.2.6 "docker-entrypoint.s…" 18 minutes ago Up 18 minutes redis-master2
a83068b0bb11 redis:6.2.6 "docker-entrypoint.s…" 18 minutes ago Up 18 minutes redis-slave3
10cf7f6d8030 redis:6.2.6 "docker-entrypoint.s…" 18 minutes ago Up 18 minutes redis-salve2
567b7bf3fd22 redis:6.2.6 "docker-entrypoint.s…" 18 minutes ago Up 18 minutes redis-slave1
3f35eb8ca98d redis:6.2.6 "docker-entrypoint.s…" 18 minutes ago Up 18 minutes redis-master3
c62e2336f18f redis:6.2.6 "docker-entrypoint.s…" 18 minutes ago Up 18 minutes redis-master1
[root@localhost redis-config]# docker stop 69913c91e2dd a83068b0bb11 10cf7f6d8030 567b7bf3fd22 3f35eb8ca98d c62e2336f18f
69913c91e2dd
a83068b0bb11
10cf7f6d8030
567b7bf3fd22
3f35eb8ca98d
c62e2336f18f
[root@localhost redis-config]# docker rm 69913c91e2dd a83068b0bb11 10cf7f6d8030 567b7bf3fd22 3f35eb8ca98d c62e2336f18f
69913c91e2dd
a83068b0bb11
10cf7f6d8030
567b7bf3fd22
3f35eb8ca98d
c62e2336f18f
再刪除所有節(jié)點(diǎn)的data文件夾下的數(shù)據(jù)配置
位于docker-compose.yml中設(shè)置的映射地址(
/home/redis/redis-config/7004/data:/data)
重建集群
進(jìn)入/home/redis/redis-config(docker-compose.yml同級(jí))目錄后執(zhí)行啟動(dòng)命令
[root@localhost redis-config]# docker-compose up -d
集群狀態(tài)錯(cuò)誤
如果實(shí)際測試過程中發(fā)現(xiàn)endpoint serving hash slot is not reachable錯(cuò)誤，需要查看集群節(jié)點(diǎn)的狀態(tài),如果狀態(tài)為fail或者集群節(jié)點(diǎn)不是對(duì)應(yīng)的三主三從,那么集群就沒有建好。
進(jìn)入容器后查看集群信息
127.0.0.1:7005> cluster info
cluster_state:fail
cluster_slots_assigned:0
cluster_slots_ok:0
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:1
cluster_size:0
cluster_current_epoch:0
cluster_my_epoch:0
cluster_stats_messages_sent:0
cluster_stats_messages_received:0
127.0.0.1:7005> cluster node
(error) ERR Unknown subcommand or wrong number of arguments for 'node'. Try CLUSTER HELP.
127.0.0.1:7005> cluster nodes
ab48156e010439f300d182a2c97405f0284d2812 :7005@17005 myself,master - 0 0 0 connected
如果是公網(wǎng)，可以使用下列代碼添加集群
127.0.0.1:7001> cluster meet 127.0.0.1 7002
OK
127.0.0.1:7001> cluster meet 127.0.0.1 7003
OK
執(zhí)行上述代碼后，本節(jié)點(diǎn)會(huì)以master加入，可能會(huì)破壞集群，這一點(diǎn)需要注意。
如果不小心添加了不存在的ip和端口，那么執(zhí)行下面命令進(jìn)行移除
cluster forget noaddr報(bào)錯(cuò)的id
例如:
127.0.0.1:7006> cluster nodes
ab48156e010439f300d182a2c97405f0284d2812 :0@0 slave,noaddr d30478df0a2e801eb479bad12507829af8bb066c 1646751982380 1646751982380 3 disconnected
d30478df0a2e801eb479bad12507829af8bb066c 127.0.0.1:7003@17003 master - 0 1646752420971 3 connected 10923-16383
b261873db577925008b8aa860effae78c54ddb83 127.0.0.1:7002@17002 slave 588437eeb993168ac80da825b66a1d128fe9f422 0 1646752419000 7 connected
c9f242c66084f411150091c991e948c7adeab813 127.0.0.1:7001@17001 master - 0 1646752423001 1 connected 0-5460
588437eeb993168ac80da825b66a1d128fe9f422 127.0.0.1:7004@17004 master - 0 1646752421987 7 connected 5461-10922
39baee913bf54b477b76c391cdff029a00df4d82 127.0.0.1:7006@17006 myself,slave c9f242c66084f411150091c991e948c7adeab813 0 1646752421000 1 connected
127.0.0.1:7006>
上面的節(jié)點(diǎn)中ab48156e010439f300d182a2c97405f0284d2812這個(gè)節(jié)點(diǎn)是個(gè)錯(cuò)誤節(jié)點(diǎn)，進(jìn)入redis控制臺(tái)刪除(進(jìn)入任意正常的集群即可)，然后將未進(jìn)入集群的redis節(jié)點(diǎn)加入集群
[root@localhost ~]# docker exec -it redis-master1 /bin/bash
root@localhost:/data# redis-cli -h 127.0.0.1 -p 7001 -a 1qaz2wsx
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:7001> cluster forget ab48156e010439f300d182a2c97405f0284d2812
OK
注意-需要進(jìn)入所有的節(jié)點(diǎn)將其遺忘,否則其他節(jié)點(diǎn)還是會(huì)保留這個(gè)noaddr的節(jié)點(diǎn)信息
#以從節(jié)點(diǎn)方式添加節(jié)點(diǎn)
redis-cli --cluster add-node new_host:new_port existing_host:existing_port --cluster-slave
開機(jī)跟隨docker啟動(dòng)
docker update container_name/id --restart=always
可以在代碼中配置重啟參數(shù)
docker-compose.yml中其實(shí)已經(jīng)設(shè)置了restart: always屬性，并且虛擬機(jī)重啟后容器確實(shí)會(huì)跟隨重啟，但是實(shí)際發(fā)現(xiàn)重啟不完全，集群掛了！
注意，如果虛擬機(jī)重啟后集群cluster down了,可能是redis容器沒有正常重啟,手動(dòng)重啟即可
所以需要在開機(jī)后手動(dòng)重啟所有的容器，讓集群正常。
重啟代碼
docker restart `docker ps -a | grep redis- | awk '{print $1}'`
建議配置成sh腳本文件,開機(jī)自運(yùn)行
