一、redis-cluster搭建
1、拉取redis鏡像,我的版本是5.0.5
docker pull redis
redis運行後查看版本命令,fdaac4274b6e是容器id
docker exec -it fdaac4274b6e redis-server -v
2、在目錄/opt/redis-cluster下新增6個文件夾,分別是6318、6319、6328、6329、6338、6339,在每個問價夾下新建conf和data文件夾
3、新建一個文件redis.conf,複製到每個conf文件夾中,其中端口修改成每個文件夾對應端口
port 6318
bind 0.0.0.0
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes
requirePass redis_test
4、進入/opt/redis-cluster目錄,新建文件docker-compose-redis.yaml文件
docker-compose-redis.yaml內容如下
version: "3.4"
x-image:
&default-image
redis:latest
x-restart:
&default-restart
always
x-command:
&default-command
redis-server /etc/redis/redis.conf
x-netmode:
&default-netmode
host
services:
redis1:
image: *default-image
restart: *default-restart
container_name: redis5-m1
command: *default-command
volumes:
- ./6319/data:/data
- ./6319/conf/redis.conf:/etc/redis/redis.conf
network_mode: *default-netmode
ports:
- '6319:6319' #服務端口
- '16319:16319' #集羣端口
redis2:
image: *default-image
restart: *default-restart
container_name: redis5-m2
command: *default-command
volumes:
- ./6329/data:/data
- ./6329/conf/redis.conf:/etc/redis/redis.conf
network_mode: *default-netmode
ports:
- '6329:6329'
- '16329:16329'
redis3:
image: *default-image
restart: *default-restart
container_name: redis5-m3
command: *default-command
volumes:
- ./6339/data:/data
- ./6339/conf/redis.conf:/etc/redis/redis.conf
network_mode: *default-netmode
ports:
- '6339:6339'
- '16339:16339'
redis4:
image: *default-image
restart: *default-restart
container_name: redis5-s1
command: *default-command
volumes:
- ./6318/data:/data
- ./6318/conf/redis.conf:/etc/redis/redis.conf
network_mode: *default-netmode
ports:
- '6318:6318'
- '16318:16318'
redis5:
image: *default-image
restart: *default-restart
container_name: redis5-s2
command: *default-command
volumes:
- ./6328/data:/data
- ./6328/conf/redis.conf:/etc/redis/redis.conf
network_mode: *default-netmode
ports:
- '6328:6328'
- '16328:16328'
redis6:
image: *default-image
restart: *default-restart
container_name: redis5-s3
command: *default-command
volumes:
- ./6338/data:/data
- ./6338/conf/redis.conf:/etc/redis/redis.conf
network_mode: *default-netmode
ports:
- '6338:6338'
- '16338:16338'
4、運行 docker-compose-redis.yaml
docker-compose -f docker-compose-redis.yaml up -d
運行後結果
5、拉取goodsmileduck/redis-cli鏡像
docker pull goodsmileduck/redis-cli
查看help命令
docker run --rm -it goodsmileduck/redis-cli redis-cli --cluster help
6、集羣命令
--a redis_test redis_test是redis密碼
--cluster-replicas 1表示1主1從
docker run --rm -it goodsmileduck/redis-cli redis-cli -a redis_test --cluster-replicas 1 --cluster create 172.18.171.42:6319 172.18.171.42:6329 172.18.171.42:6339 172.18.171.42:6318 172.18.171.42:6328 172.18.171.42:6338
執行結果:
7、查看集羣情況,連接任意一個節點
docker run --rm -it goodsmileduck/redis-cli redis-cli -c -h 172.18.171.42 -p 6319 -a redis_test
執行命令cluster nodes,查看結果
8、測試集羣情況,在6319端口上寫入一個h的key,數據被存在到了6339中,訪問的節點也變成了6339,則說明集羣成功
二、集羣的擴容
1、在redis-cluster文件夾中新增兩個文件夾6348、6349(參考前面),並複製redis.conf
複製docker-compose-redis.yaml並重命名爲docker-compose-redis2.yaml
修改內容爲:
version: "3.4"
x-image:
&default-image
redis:latest
x-restart:
&default-restart
always
x-command:
&default-command
redis-server /etc/redis/redis.conf
x-netmode:
&default-netmode
host
services:
redis7:
image: *default-image
restart: *default-restart
container_name: redis5-m4
command: *default-command
volumes:
- ./6349/data:/data
- ./6349/conf/redis.conf:/etc/redis/redis.conf
network_mode: *default-netmode
ports:
- '6349:6349' #服務端口
- '16349:16349' #集羣端口
redis8:
image: *default-image
restart: *default-restart
container_name: redis5-s4
command: *default-command
volumes:
- ./6348/data:/data
- ./6348/conf/redis.conf:/etc/redis/redis.conf
network_mode: *default-netmode
ports:
- '6348:6348'
- '16348:16348'
2、執行docker-compose命令
docker-compose -f docker-compose-redis2.yaml up -d
3、新增節點命令
172.18.171.42:6349 是新節點ip和端口
172.18.171.42:6339 是原集羣中的ip和端口,可以是集羣中任意一個節點iph和端口
docker run --rm -it goodsmileduck/redis-cli redis-cli --cluster add-node 172.18.171.42:6349 172.18.171.42:6339 -a redis_test
查看集羣中的信息,已經多了紅色標記的節點,但是沒有哈希槽
4、分配哈希槽
docker run --rm -it goodsmileduck/redis-cli redis-cli --cluster reshard 172.18.171.42:6349 -a redis_test
即將給該節點分配的哈希槽數據、以及該節點的id
輸入原主節點的id,可以輸入多主節點id
(1)將所有節點用作哈希槽的源節點。:all
(2)在指定的節點拿出指定數量的哈希槽分配到目標節點:done
執行完成後,查看集羣節點信息
5、新增從節點
172.18.171.42:6348 是新增節點的信息
172.18.171.42:6339 是集羣中的任意一個節點
3b752995bef67d32b30c0f0c63c5aa4172f7f811 是主節點id
docker run --rm -it goodsmileduck/redis-cli redis-cli --cluster add-node 172.18.171.42:6348 172.18.171.42:6339 --cluster-slave --cluster-master-id 3b752995bef67d32b30c0f0c63c5aa4172f7f811 -a redis_test
查看集羣情況
三、集羣的縮容
1、刪除從節點
刪除節點用del-node命令。此命令需要制定刪除節點的ip和端口,以及節點的id。
docker run --rm -it goodsmileduck/redis-cli redis-cli --cluster del-node 172.18.171.42:6348 6c0262d81dc83c809d8588d6f0c8821b91bd833c -a redis_test
2、刪除主節點
(1)將主節點的哈希槽分配到其他主節點上
將6349上的1365個槽分配到6319上
docker run --rm -it goodsmileduck/redis-cli redis-cli --cluster reshard 172.18.171.42:6349 --cluster-from 3b752995bef67d32b30c0f0c63c5aa4172f7f811 --cluster-to 6202eefd595279cf589bdec9e2fec274f63caaad --cluster-slots 1365 -a redis_test
將6349上的1366個槽分配到6329上
docker run --rm -it goodsmileduck/redis-cli redis-cli --cluster reshard 172.18.171.42:6349 --cluster-from 3b752995bef67d32b30c0f0c63c5aa4172f7f811 --cluster-to 33e1c446095012af2a43c18715f4cd5db9280679 --cluster-slots 1366 -a redis_test
將6349上的1365個槽分配到6339上
docker run --rm -it goodsmileduck/redis-cli redis-cli --cluster reshard 172.18.171.42:6349 --cluster-from 3b752995bef67d32b30c0f0c63c5aa4172f7f811 --cluster-to 65681aec21243032ef9977a1f5bc139564c584e2 --cluster-slots 1365 -a redis_test
三個都分配後,6349集羣中沒有了槽
(2)使用del-node命令來刪除主節點
docker run --rm -it goodsmileduck/redis-cli redis-cli --cluster del-node 172.18.171.42:6349 3b752995bef67d32b30c0f0c63c5aa4172f7f811 -a redis_test