Linux and Docker: How to perform persistent storage and data management of containers?-Linux Operation and Maintenance-php.cn

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.

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

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Then, we can mount the data volume into the container through thedocker runcommand, as shown below:

$ docker run -v myvolume:/data myimage

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

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 thedocker runcommand, as shown below:

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

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In this way,/host/path## on the host #The directory will be mapped to the/container/pathpath 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.

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

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Then, we can use the

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

$ mount /dev/sdb1 /container/path

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In this way, the

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

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

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Next, we can use the

lvcreatecommand to create a logical Volume (Logical Volume):

$ lvcreate -L 1G -n myvolume myvg

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

myvolume.

Next, we can use the

mkfscommand to create a file system on the logical volume:

$ mkfs.ext4 /dev/myvg/myvolume

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Finally, we can use the

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

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

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In this way, the

/container/pathpath 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:

Linux Documentation: https://www.kernel. org/doc/html/latest/admin-guide/devices/lvm.html

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