Pulling imagesįor Docker, images serve as the building blocks of your containers. Should you need to stop or restart the Docker daemon, the commands are: sudo systemctl stop docker sudo systemctl restart dockerĭocker is now ready to deploy containers. To do this, issue the following two commands: sudo systemctl start docker sudo systemctl enable docker Once installed, you will want to enable the Docker daemon at boot. Here are the commands to take care of this: sudo groupadd docker & sudo gpasswd -a $ docker & sudo systemctl restart docker newgrp docker When adding a user to the docker group to this distribution, you’ll find the group doesn’t exist. Once you’ve taken care of that, log out and back in, and you should be good to go. This is done with the command: sudo usermod -a -G docker $USER To get around this, you need to add your user to the docker group. Because of security issues, you won’t want to be working with Docker either from the root user or with the help of sudo.
Out of the box, the docker command can only be run with admin privileges.
DOCKER SUDO DOWNLOAD
Once that completes, issue the following command to download and run the necessary script: curl -fsSL | sh
DOCKER SUDO UPDATE
First update the platform with the command sudo yum check-update. If your distribution of choice is CentOS 7, installing docker is best handled via an installation script.
DOCKER SUDO INSTALL
For instance, the installation on Fedora would be: sudo dnf install docker If you’re using a different Linux distribution, and you attempt to install (using your distribution’s package manager of choice), only to find out docker.io isn’t available, the package you want to install is called docker. The Docker installation command is: sudo apt install docker.io If the kernel doesn’t upgrade, you’re good to install Docker (without having to reboot). If the kernel upgrades, you’ll want to reboot the server with the command: sudo reboot
DOCKER SUDO UPGRADE
Once that completes, upgrade with the command: sudo apt upgrade To update apt, issue the command: sudo apt update Thus, you might want to plan to do this during a time when a server reboot is acceptable. Do note, if your server’s kernel upgrades, you’ll need to reboot the system. Before you run the installation command, make sure to update apt and then run any necessary upgrades. Since Ubuntu Server 16.04 is sans GUI, the installation and usage of Docker will be handled entirely through the command line. I will assume you already have Ubuntu Server 16.04 up and running and ready to go. I’ll be demonstrating on the Ubuntu 16.04 Server platform, but the process is very similar on most all Linux distributions. I’m going to demonstrate how easy it is to install Docker on Linux, as well as walking you through the first steps of working with Docker. What’s best is that installing and using Docker is second-nature to the Linux platform. Unlike doing this with Virtual Machines, containers will not put nearly the hit on your system resources.ĭocker makes creating, deploying, and managing containers incredibly simple. For example, you can quickly deploy multiple instances of NGINX (even with multiple stagings - such as development and production).
And that is the biggest difference between a container and a virtual machine whereas a virtual machine is a full-blown operating system platform, running on a host OS, a container is not.Ĭontainers allow you to expand your company offerings (either internal or external) in ways you could not otherwise. Each container is deployed with its own CPU, memory, block I/O, and network resources, all without having to depend upon an individual kernel and operating system. Containers are lightweight, standalone packages that contain everything needed to run an application (code, libraries, runtime, system settings, and dependencies). Containers are all the rage in IT - with good reason.
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