Inspect Return low-level information on a container or image Import Import the contents from a tarball to create a filesystem image docker Īs of Docker 1.11.1, the complete list of available subcommands includes:Ĭommit Create a new image from a container's changesĬp Copy files/folders between a container and the local filesystemĭiff Inspect changes on a container's filesystemĮvents Get real time events from the serverĮxec Run a command in a running containerĮxport Export a container's filesystem as a tar archive.Using docker consists of passing it a chain of options and subcommands followed by arguments. With Docker installed and working, now’s the time to become familiar with the command line utility. If you choose not to, please prepend the commands with sudo. The rest of this article assumes you are running the docker command as a user in the docker user group. If you need to add a user to the docker group that you’re not logged in as, declare that username explicitly using: You will need to log out of the Droplet and back in as the same user to enable this change. If you want to avoid typing sudo whenever you run the docker command, add your username to the docker group: Is the docker daemon running on this host?. Outputdocker: Cannot connect to the Docker daemon. The output should be similar to the following, showing that the service is active and running: It will add the official Docker repository, download the latest version of Docker, and install it:Īfter installation has completed, start the Docker daemon: This section shows you how to do just that.īut first, let’s update the package database: To get the latest and greatest version, install Docker from the official Docker repository. The Docker installation package available in the official CentOS 7 repository may not be the latest version. Initial Setup Guide for CentOS 7 explains how to add users and give them sudo access.

If root access is required for the command, it will be preceded by sudo. The default 64-bit CentOS 7 Droplet meets these requirements.Īll the commands in this tutorial should be run as a non-root user. Note: Docker requires a 64-bit version of CentOS 7 as well as a kernel version equal to or greater than 3.10.

Yum install docker centos 7