Linux and Docker: How to perform persistent storage and data management of containers?

Linux and Docker: How to perform persistent storage and data management of containers?

In the application of containerization technology, the persistent storage and data management of containers are a very important part. This article will introduce how to implement persistent storage of containers in Linux and Docker, and provide corresponding code examples.

1. Container persistent storage in Docker

In Docker, containers are created through images, and the images themselves are read-only. Therefore, when the container is deleted, the data inside it will also be lost. In order to implement persistent storage of containers, we can use the following methods.

1. Using Data Volume (Volume)

Data volume is one of the most commonly used persistent storage methods in Docker. By creating a data volume and mounting it to the specified path of the container, we can achieve persistent storage of container data.

First, we create a data volume:

$ docker volume create myvolume

Then, we can mount the data volume into the container through the docker run command, as shown below:

$ docker run -v myvolume:/data myimage

In this way, the /data path in the container will be mapped to the data volume named myvolume. When the container is deleted, the data volume will not be automatically deleted and the data will be retained.

2. Using Bind Mount

Bind mounting refers to mounting a directory on the host to a specified path in the container, thereby Implement persistent storage of container data.

We can bind mount through the docker run command, as shown below:

$ docker run -v /host/path:/container/path myimage

In this way, /host/path## on the host #The directory will be mapped to the /container/path path in the container. When the container is deleted, the data on the host will remain.

2. Container Persistent Storage in Linux

In addition to the persistent storage of containers in Docker, we can also implement container data management through the underlying technology of Linux.

Using a shared file system

In Linux, persistent storage of containers can be achieved by using a shared file system. We can create a file system on the host and mount it into the container to achieve persistent storage of container data.

First, we need to create a file system on the host, such as using the ext4 file system, you can use the following command:

$ mkfs.ext4 /dev/sdb1

Then, we can use the

mount command to The file system is mounted to the specified path in the container:

$ mount /dev/sdb1 /container/path

In this way, the

/container/path path in the container will be mounted as a shared file system. When the container is deleted , the data will be retained.

Using Storage Volume Manager

Storage Volume Manager is an advanced feature in Linux that can realize data snapshots, cloning, migration, etc. Function. We can use storage volume managers to implement container data management.

First, we need to install the storage volume manager software package, such as LVM (Logical Volume Manager):

$ apt-get install lvm2

Next, we can use the

lvcreate command to create a logical Volume (Logical Volume):

$ lvcreate -L 1G -n myvolume myvg

In this way, we created a logical volume with a size of 1GB and named it

myvolume.

Next, we can use the

mkfs command to create a file system on the logical volume:

$ mkfs.ext4 /dev/myvg/myvolume

Finally, we can use the

mount command to The logical volume is mounted to the specified path in the container:

$ mount /dev/myvg/myvolume /container/path

In this way, the

/container/path path in the container will be mounted as a logical volume. When the container is deleted, the data will remain.

To sum up, whether in Docker or Linux, we can achieve persistent storage and data management of containers through different methods. By choosing the right method reasonably, we can better manage and maintain the data in the container.

I hope this article will help you understand and use the persistent storage and data management of containers!

Reference:

Docker Documentation: https://docs.docker.com/storage/
• Linux Documentation: https://www.kernel. org/doc/html/latest/admin-guide/devices/lvm.html

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