Docker Rhel 7 Image

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  1. Docker Rhel 7 Images
  2. Docker Rhel 7 Base Image

I tried this method, but the instructions for Centos are only accurate for version 6.5 and below. Unfortunately I am running 7.0. I tried to revert everything by moving the /var/lib/docker directory back to its original location, but now when I run docker images or docker ps -a, I have no containers or images. Between RHEL 6, RHEL 7 and RHEL 8 there are numerous changes in tools, commands and workflows. Included the possible difference between them in this article. We have gone through several Red Hat articles and RHEL 6, 7 and 8 Release Notes to gather this information. We have added a comparison table based on category.

You can change Docker’s storage base directory (where container and images go) using the -g option when starting the Docker daemon.

This page shows how to install, setup and use Docker or Docker CE on RHEL 7 or CentOS 7 server and create your first container. How to install and use Docker on RHEL 7 or CentOS 7 (method 1) The procedure to install Docker is as follows: Open the terminal application or login to the remote box using ssh command: ssh user@remote-server-name. Instructs Docker to pull the base image from which you are building the new image. Use a tag to specify the exact image from which you are building: Ex: FROM ubuntu:20.04 MAINTAINER = Author of the build image; RUN = This instruction can be used on multiple lines and runs any commands after a Docker image has been created. CMD = Run any command. The image keyword lets docker know what image we want to use to build our container: in this case I used 7.2.1-apache which will provide us php 7.2.1 together with the apache web server. Need another php version? You just need to choose from the many provided in the image page on dockerhub.

Rhel

  • Ubuntu/Debian: edit your /etc/default/docker file with the -g option: DOCKER_OPTS='-dns 8.8.8.8 -dns 8.8.4.4 -g /mnt'

  • Fedora/Centos: edit /etc/sysconfig/docker, and add the -g option in the other_args variable: ex. other_args='-g /var/lib/testdir'. If there’s more than one option, make sure you enclose them in ' '. After a restart, (service docker restart) Docker should use the new directory.

Using a symlink is another method to change image storage.

Docker Rhel 7 Images

Caution - These steps depend on your current /var/lib/docker being an actual directory (not a symlink to another location).

Docker Rhel 7 Base Image

  1. Stop docker: service docker stop. Verify no docker process is running ps faux
  2. Double check docker really isn’t running. Take a look at the current docker directory: ls /var/lib/docker/
    2b) Make a backup - tar -zcC /var/lib docker > /mnt/pd0/var_lib_docker-backup-$(date +%s).tar.gz
  3. Move the /var/lib/docker directory to your new partition: mv /var/lib/docker /mnt/pd0/docker
  4. Make a symlink: ln -s /mnt/pd0/docker /var/lib/docker
  5. Take a peek at the directory structure to make sure it looks like it did before the mv: ls /var/lib/docker/ (note the trailing slash to resolve the symlink)
  6. Start docker back up service docker start
  7. restart your containers