In this 4-article series, we will discuss Docker, which is an open-source lightweight virtualization tool that runs at top of Operating System level, allowing users to create, run and deploy applications, encapsulated into small containers.
This type of Linux containers are proven to be fast, portable, and secure. The processes that run in a Docker container are always isolated from the main host, preventing outside tampering.
Part 1: Install Docker and Learn Basic Container Manipulation in CentOS and RHEL 8/7
Part 2:How to Deploy and Run Applications into Docker Containers on CentOS/RHEL 8/7
Part 3: Automatically Build and Configure Docker Images with Dockerfile on CentOS/RHEL 8/7
Part 4: How to Monitor Docker Containers in Linux
This tutorial provides a starting point on how to install Docker, create and run Docker containers on CentOS/RHEL 8/7, but barely scratches the surface of Docker.
Step 1: Install and Configure Docker
1. Earlier versions of Docker were called docker or docker-engine, if you have these installed, you must uninstall them before installing a newer docker-ce version.
# yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
2. To install the latest version of the Docker Engine you need to set up the Docker repository and install the yum-utils package to enable Docker stable repository on the system.
# yum install -y yum-utils
# yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
3. Now install the newer docker-ce version from the Docker repository and containerd manually, because due to some issues, Red Hat blocked the installation of containerd.io > 1.2.0-3.el7, which is a dependency of docker-ce.
# yum install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
# yum install docker-ce docker-ce-cli
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