docker如何扩overlay

Docker中的overlay存储驱动可以通过扩展overlay来增加存储空间。下面是一种方法来扩展overlay：

1. 首先，停止Docker服务：

sudo systemctl stop docker

2. 然后，将现有的overlay存储目录复制到新的位置。假设现有的overlay存储目录是/var/lib/docker/overlay2，新的位置是/new/overlay2：

sudo cp -R /var/lib/docker/overlay2 /new/overlay2

3. 接下来，编辑Docker的配置文件，将overlay存储目录更改为新的位置。打开/etc/docker/daemon.json文件（如果不存在则创建它），并添加以下内容：

{
  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true",
    "overlay2.override_os_check=true"
  ],
  "graph": "/new/overlay2"
}

4. 保存并关闭文件。

5. 最后，重新启动Docker服务：

sudo systemctl start docker

现在，Docker的overlay存储驱动已经扩展到新的位置。

相关问题

docker/overlay2

docker/overlay2 是 Docker 存储驱动 overlay2 在/var/lib/docker 目录下的默认存储位置。 Overlay2 是 Docker 存储驱动的一种类型，它用于将多个文件系统层级叠加在一起以创建镜像和容器。当使用指令 docker pull 下载 Ubuntu 镜像时，相关的文件会被存储在 /var/lib/docker/overlay2 目录下的多个目录中。 当使用 mount 指令查看挂载情况时，可以看到 overlay 文件系统被挂载到 /var/lib/docker/overlay2/merged 目录上。 如果想备份 Docker 的数据，可以将 /var/lib/docker 目录下的内容拷贝到其他地方进行备份，以防意外情况发生。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* *3* [Docker的 Overlay/Overlay2 文件系统](https://blog.csdn.net/weixin_42445065/article/details/123686614)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 100%"]
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docker log overlay

The Docker overlay network driver is designed to provide a scalable and flexible networking solution for Docker containers running on multiple hosts. The overlay network driver allows Docker containers to communicate with each other seamlessly, regardless of the host they are running on.

When using the overlay network driver, Docker logs are also handled differently than with other drivers. Docker logs from containers running on an overlay network are not automatically sent to the host's syslog daemon, as they are with the default bridge network driver. Instead, Docker logs are sent directly to the Docker daemon on the host where the container is running.

To view Docker logs for containers running on an overlay network, you can use the `docker logs` command followed by the container ID or name. For example, to view the logs for a container named `my-container` running on an overlay network named `my-overlay-network`, you would use the following command:

docker logs my-container

If you want to view the logs for a container running on a specific host in an overlay network, you can use the `docker logs` command with the `--tail` and `--follow` options, followed by the container ID or name and the hostname. For example, to view the logs for a container named `my-container` running on a host named `my-host` in an overlay network named `my-overlay-network`, you would use the following command:

docker logs --tail 100 --follow my-container@my-host

This command will display the last 100 lines of logs for the container and continue to follow new logs as they are generated.