如何将多个容器中的写入同步到群集上的同一卷? [英] How to synchronise writes from multiple containers to the same volume on a swarm?

问题描述

使用 flock 在Docker群中?

Is it safe / possible to use flock in a docker swarm?

我正在寻找一种安全的方法，以使多个容器写入同一文件(在同一卷上).我知道，泊坞窗将在单个主机上绑定安装.我不确定的是当通过docker-compose在集群上旋转容器时，这是如何工作的.

I'm looking for a safe way for multiple containers to write to the same file (on the same volume). I know that on a single host docker will bind mount. What I'm not certain about is how this works when spinning up containers via docker-compose on a swarm.

如果服务中有多个同一图像的实例，并且它们全部共享一个卷，那么当我在一个群集中启动该容器时，这些容器将在单独的主机上启动吗?如果是这样，将如何在操作系统级别共享该卷?我有什么同步选项来控制并发写入?

If I have multiple instances of the same image in a service and these all share a volume then when I start this on a swarm will the containers be started on separate hosts? If so how will the the volume be shared at an OS level? What synchronisation options do I have for controlling concurrent writes?

推荐答案

创建NFS卷

示例:

  # create a reusable volume
  $ docker volume create --driver local \
      --opt type=nfs \
      --opt o=nfsvers=4,addr=192.168.1.1,rw \
      --opt device=:/path/to/dir \
      foo

  # inside a docker-compose file
  ...
  volumes:
    nfs-data:
      driver: local
      driver_opts:
        type: nfs
        o: nfsvers=4,addr=192.168.1.1,rw
        device: ":/path/to/dir"

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