docker compose部署主從復制的實現

################################# REPLICATION #################################

# 【Slave】連接 Master 的配置
# slaveof 172.25.0.101 6379

# 【Slave】隻讀模式
# slave-read-only yes

# 【Slave】密碼
# masterauth <master-password>

# 【Slave】復制期間是否允許響應查詢，可能會返回臟數據
# slave-serve-stale-data yes

# 【Slave】Slave 晉級為 Master 的優先級，僅哨兵模式下生效
# slave-priority 100

# 【Slave】Slave 向 Master 報告的自己的 IP
# slave-announce-ip 5.5.5.5

# 【Slave】Slave 向 Master 報告的自己的端口
# slave-announce-port 1234

# 【Slave】Slave ping Master 的時間間隔
# repl-ping-slave-period 10

# 【Master/Slave】超時時間
# repl-timeout 60

# 【Master】Diskless 就是直接將要復制的 RDB 文件寫入到 Socket 中，而不會先存儲到磁盤上
repl-diskless-sync no

# 【Master】若開啟 Diskless，會等待指定秒之後再進行復制，以便讓更多客戶端可以在窗口期內連接，並行傳送
# repl-diskless-sync-delay 5

# 【Master】是否開啟 Nagle 算法，可以減少流量占用，但會同步得慢些
repl-disable-tcp-nodelay no

# 【Master】環形緩沖日志的大小，給 Slave 斷開之後重連使用，避免全量復制，默認 1mb
# repl-backlog-size 1mb

# 【Master】當 Master 斷連所有 Slave 指定時間後，Master 會清空 backlog
# repl-backlog-ttl 3600

# 【Master】當低於指定個 Slave 連接時，Master 拒絕所有寫操作
# min-slaves-to-write 3

# 【Master】當延遲高於指定秒數時，Master 拒絕所有寫操作
# min-slaves-max-lag 10

replication/
├── docker-compose.yml
├── master
│   ├── data
│   └── redis.conf
├── slave1
│   ├── data
│   └── redis.conf
└── slave2
    ├── data
    └── redis.conf

version: "3"

networks:
  redis-replication:
    driver: bridge
    ipam:
      config:
        - subnet: 172.25.0.0/24

services:
  master:
    image: redis
    container_name: redis-master
    ports:
      - "6371:6379"
    volumes:
      - "./master/redis.conf:/etc/redis.conf"
      - "./master/data:/data"
    command: ["redis-server", "/etc/redis.conf"]
    restart: always
    networks:
      redis-replication:
        ipv4_address: 172.25.0.101

  slave1:
    image: redis
    container_name: redis-slave-1
    ports:
      - "6372:6379"
    volumes:
      - "./slave1/redis.conf:/etc/redis.conf"
      - "./slave1/data:/data"
    command: ["redis-server", "/etc/redis.conf"]
    restart: always
    networks:
      redis-replication:
        ipv4_address: 172.25.0.102

  slave2:
    image: redis
    container_name: redis-slave-2
    ports:
      - "6373:6379"
    volumes:
      - "./slave2/redis.conf:/etc/redis.conf"
      - "./slave2/data:/data"
    command: ["redis-server", "/etc/redis.conf"]
    restart: always
    networks:
      redis-replication:
        ipv4_address: 172.25.0.103

port 6379
protected-mode no

repl-diskless-sync no
repl-disable-tcp-nodelay no

port 6379
protected-mode no

slaveof 172.25.0.101 6379
slave-read-only yes
slave-serve-stale-data yes

ocker-compose up -d
Creating network "replication_redis-replication" with driver "bridge"
Creating redis-slave-1 ... done
Creating redis-master  ... done
Creating redis-slave-2 ... done

127.0.0.1:6371> set hello world
OK

127.0.0.1:6372> get hello
"world"

127.0.0.1:6372> set hello redis
(error) READONLY You can't write against a read only replica.