How to use Docker for data management and persistent storage

How to use Docker for data management and persistent storage

Docker is a popular containerization platform that can help developers build, deliver and run more easily app. When using Docker, a common question is how to manage data and implement persistent storage. This article will introduce several common methods and specific code examples to help readers learn how to implement data management and persistent storage in Docker.

1. Using data volumes

Docker provides a mechanism called data volumes (Volume), which can connect a part of the file system in the container with the host or other containers. association. By using data volumes, persistent storage of container data can be achieved.

First, create a data volume:

$ docker volume create mydata

Next, create a container and mount the data volume to the directory specified in the container:

$ docker run -d -v mydata:/data --name mycontainer myimage

In this way, the container The /data directory in will be associated with the mydata data volume. No matter how the container changes and is restarted, the data in the data volume will be retained.

2. Use the host directory to mount

In addition to using data volumes, you can also directly mount the host directory into the container to achieve persistent storage of data.

First, create a data storage directory in the specified directory of the host:

$ mkdir /data

Next, create a container and mount the host directory to the directory specified in the container:

$ docker run -d -v /data:/data --name mycontainer myimage

In this way, the /data directory in the container will be associated with the /data directory of the host. Any changes to the /data directory in the container will be reflected directly in the host directory.

3. Use Network File System (NFS)

If you need to achieve data sharing and persistent storage between multiple Docker hosts, you can use Network File System (NFS) .

First, install and configure the NFS server on the host:

$ apt-get install nfs-kernel-server
$ echo "/data *(rw,sync,no_subtree_check)" >> /etc/exports
$ exportfs -ra
$ service nfs-kernel-server restart

Next, install the nfs-utils tool on the Docker host:

$ apt-get install nfs-common

Then, create a container, And mount the NFS shared directory to the directory specified in the container:

$ docker run -d -v nfs-volume:/data --name mycontainer myimage

In the above code, nfs-volume is an NFS shared directory.

Through the above method, data can be shared and persisted between multiple Docker hosts.

Summary:

This article introduces several methods on how to use Docker for data management and persistent storage. Persistent storage and sharing of data in containers can be achieved by using data volumes, host directory mounts, and Network File System (NFS). These methods are relatively simple and easy to use, and you can choose the appropriate method according to the specific scenario.

Note: The above code examples are for demonstration purposes only and may be different from your actual environment. Please make appropriate modifications according to your actual situation.

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