Redis的docker compose部署示例

1. 创建配置文件

创建redis.conf配置文件，添加aof以及rdb配置信息，具体如下：

# 密码自行替换
requirepass aNrLBR840p6ymwTYmA

tcp-backlog 511

appendonly yes
appendfsync everysec

save 900 1
save 300 10
save 60 10000

2. 创建docker-compose

docker-compose.yml配置信息如下所示（添加了数据持久化配置）：

version: "3.8"
services:
  redis:
    container_name: redis
    hostname: redis
    image: redis:7.4.1-alpine
    command: redis-server /usr/local/etc/redis/redis.conf
    volumes:
      - ./data:/data
      - ./redis.conf:/usr/local/etc/redis/redis.conf
    ports:
      - "6379:6379"

3. 修正# WARNING Memory overcommit must be enabled!问题

参照前序章节配置，启动redis容器，会出现如下提示：

1:C 22 Jan 2025 08:43:05.587 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. Being disabled, it can also cause failures without low memory condition, see https://github.com/jemalloc/jemalloc/issues/1328. 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.

对于此问题，可以参照《How to remove Redis warning on Docker: Memory overcommit must be enabled》一文解决，缺点是docker logs无法观察到日志。

3.1 编写启动脚本

init.sh脚本如下：

# 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.
# The overcommit_memory has 3 options.
# 0, the system kernel check if there is enough memory to be allocated to the process or not, 
# if not enough, it will return errors to the process.
# 1, the system kernel is allowed to allocate the whole memory to the process
# no matter what the status of memory is.
# 2, the system kernel is allowed to allocate a memory whose size could be bigger than
# the sum of the size of physical memory and the size of exchange workspace to the process.
sysctl vm.overcommit_memory=1

# Start redis server
redis-server /usr/local/etc/redis/redis.conf --bind 0.0.0.0

3.2 Dockerfile

FROM redis:7.4.1-alpine
WORKDIR /redis
COPY redis.conf /usr/local/etc/redis/redis.conf
COPY init.sh ./
RUN chmod +x init.sh

3.3 docker-compose

version: '3.8'
services:
    cache:
        # Adjust the build context to your needs targetting the created Dockerfile
        build:
            context: .
            dockerfile: Dockerfile
        #image: redis:7.2-alpine
        restart: always
        ports:
            - 6379:6379
        # Run the init script
        command: sh -c "./init.sh"
        # Run as privileged to allow the container to change the vm.overcommit_memory setting
        privileged: true
        volumes:
            - ./data:/data