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Use the -l flag to show the latest created container in all states: $ docker ps To list Docker containers, use the docker ps command as follows. The above container process exits after the command runs. Note that you can manipulate a container using the container’s ID, ID-prefix, or name as shown below. To start a container based on your new centos image, run the following command where “centos” is the local image name and “ cat /etc/centos-release” is the command to run in the container: $ docker run centos cat /etc/centos-releaseĪ container runs a discrete process that is isolated in that it has its own: file system, networking, and isolated process tree separate from the host. Concerning a Docker image, a container is just a running image. $ docker rmi centos:latest #where latest is the tagĪ Docker container is a process that runs natively on Linux and shares the kernel of the host machine with other containers. If you no longer need an image, you can remove it from your system.
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Once the download is complete, you can list the available images on your local system.
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This example shows how to download the official centos image. To download an image locally, use the pull command. You can search for an centos image in the Docker Hub with the following command: $ docker search centos You can either create your custom images or you can only use those created by others and published in the Docker Hub, the world’s largest library and community for container images. Verify Docker Installation Working with Docker ImagesĪ Docker image is a read-only template file with instructions for creating a Docker container. This is also another way to cross-check whether your installation is working fine. Once the container is running, it prints an informational message and exits. The following command downloads a test image and runs it in a container. Next, verify that you can run docker commands without sudo. To activate the changes to groups, run the following command: $ newgrp docker In this example, the command adds the currently logged on user ($USER) or username to the docker group: $ sudo usermod -aG docker $USER To run the docker command without sudo, add all non-root users who are supposed to access docker, in the docker group as follows. When the Docker daemon starts, it creates a UNIX socket accessible by members of the docker group (which grants privileges equivalent to the root user). Therefore the Docker daemon always runs as the root user and to run the docker command, you need to use sudo.īesides, during the Docker package installation, a group called docker is created. List of Docker Commands Manage Docker as a non-root User with sudo Commandīy default, the Docker daemon binds to a UNIX socket (instead of a TCP port) which is owned by the user root. You can view available docker usage commands by running the docker command without any options or arguments: To check the version of Docker CE installed on your system, run the following command: $ docker version $ sudo systemctl restart docker #restart the docker service $ sudo systemctl start docker #start the docker service There are several other systemctl commands to manage and control the docker service which includes the following: $ sudo systemctl stop docker #stop the docker service Also, check its status: $ sudo systemctl is-active docker
![daemon tools linux ubuntu download daemon tools linux ubuntu download](https://img-blog.csdnimg.cn/20200922163359441.png)
Using the following commands to confirm that the docker service is active and is enabled to automatically start at system startup.
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$ sudo apt install docker-ceĭuring the Docker package installation process, the package installer triggers the systemd (system and service manager) to automatically start and enable the docker service. Next, install the Docker package as shown.
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Now update the APT package cache to include the new Docker packages to the system using the following command. $ sudo add-apt-repository "deb focal stable" So, start by adding the GPG key for the official Docker repository to your system, after that add the repository configuration to the APT source with the following commands. To use the latest version of Docker, we will install it from the official Docker repository. A user with privileges to run sudo command.For this guide, we will install Docker Community Edition ( CE). This article is a good starting point for beginners to learn how to install and use Docker on a Ubuntu 20.04 Linux system with some basic commands. Containerization (the use of containers to deploy applications) is becoming popular because containers are flexible, lightweight, portable, loosely coupled, scalable, and more secure. Docker is a most popular, open-source platform for developers and system administrators to build, run, and share applications with containers.