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The -m switch is for the commit message that helps you and others know what changes you made, while -a is used to specify the author.

For a detailed introduction to the different components of a Docker container, check out The Docker Ecosystem: An Introduction to Common Components.

One method involves installing it on an existing installation of the operating system.

The other involves spinning up a server with a tool called Docker Machine that auto-installs Docker on it.

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A CentOS 7 server set up using Initial Setup Guide for CentOS 7 explains how to set this up.

If root access is required for the command, it will be preceded by sudo.

Initial Setup Guide for CentOS 7 explains how to add users and give them sudo access.

To get the latest and greatest version, install Docker from the official Docker repository.

Is Docker Any Good Download The Latest

It will add the official Docker repository, download the latest version of Docker, and install it.

Well explore how to use the docker command later in this tutorial.

It can also be run by a user in the docker group, which is automatically created during the installation of Docker.

If you attempt to run the docker command without prefixing it with sudo or without being in the docker group, youll get an output like this.

If you choose not to, please prepend the commands with sudo.

Using docker consists of passing it a chain of options and subcommands followed by arguments.

Anybody can build and host their Docker images on Docker Hub, so most applications and Linux distributions youll need to run Docker containers have images that are hosted on Docker Hub.

This message shows that your installation appears to be working correctly.

Once youve identifed the image that you would like to use, you can download it to your computer using the pull subcommand, like so.

If an image has not been downloaded when docker is executed with the run subcommand, the Docker client will first download the image, then run a container using it.

Containers, however, can be much more useful than that, and they can be interactive.

After all, they are similar to virtual machines, only more resource-friendly.

The combination of the -i and -t switches gives you interactive shell access into the container.

For example, lets install MariaDB server in the running container.

No need to prefix any command with sudo, because youre operating inside the container with root privileges.

You can start and stop it, but once you destroy it with the docker rm command, the changes will be lost for good.

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