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Automating Container Management with Ansible

Here we will need 2 systems,

  1. Ansible controller (any of these RHEL/CentOS/FreeBSD/Ubuntu)
  2. remote host (any of these RHEL/CentOS/FreeBSD/Ubuntu)

IMP

  • Ansible controller needs to have python 2.7 or python3.5 installed

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Docker Implemenation

Docker Architecture

We will Build container Images using Docker

  • docker uses client server architecture

Client: The command line toolis responsible for communicating with a server using a RESTful API to request operations

Server: It runs a daemon on an OS, does the heavy lifting of building, running and downloading container images.

The daemon can run either on the same system as the docker client or remotely

Docker Daemon

Docker daemon needs to be started for docker commands to work. Manually you can run

systemctl enable --now docker
  • Daemon is run as the root user, Docker commands must also be run as root.
  • Other container runtimes like podman do not require root to run containers

Docker CLI

Some of the most common commands are:

Command Description
docker search "term" search an image registry for an image related to the term
docker pull "imagename" download an image or images from a registry
docker run "imagename" creates the container from the image
docker ps List the containers
docker images List the Downloaded images

Installing Docker with Ansible

  • You can write simple play to install Docker on RHEL7 automatically
  • You will need to:
    • make sure that RHEL7 managed host is configured to get updates for the right channels
    • make sure that the Docker package is installed
    • make sure that the Docker service is enables and started