将redis与docker-complace一起使用：MISCONF Redis配置为保存RDB快照，但目前无法保留在磁盘上

Question

我相信这个问题在这里得到了一些回答：MISCONF Redis被配置为保存RDB快照。

我目前正在运行一个Redis docker容器，它不时返回以下错误：

MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.

结合：

redis_1        | 4410:C 06 Feb 2020 23:50:57.045 # Failed opening the RDB file crontab (in server root dir /etc) for saving: Permission denied

这是因为redis的空间不够吗？我能做些什么来清理redis吗？我只使用redis作为消息代理层，因此实际上不需要持久化数据。。。

我还看到以下WARNINGS来自redis容器：

# WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

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.

WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.

我觉得这个问题可能是让redis/devops专家概述使用docker compose配置redis的最佳方法的绝佳机会，我目前有：

  redis:
    build:
      context: ./redis
      dockerfile: Dockerfile
    ports:
      - '6379:6379'
    volumes:
        - ./redis.conf:/usr/local/etc/redis/redis.conf
    sysctls:
      net.core.somaxcomm: '511'
    restart: on-failure

如果有更好的事情可以做，那将是令人惊讶和感激的。

Answer 1

更新：使用expose而不是port，因此服务仅对链接的服务可用

在不将端口发布到主机的情况下公开端口-它们只能由链接的服务访问。只能指定内部端口。

expose
 - 6379

原始答案：您的redis实例可能已向互联网开放。您可以使用redis。conf-to-bind 127.0.0.1只允许本地连接。

请参见此处的详细答案