Docker is a set of platform as a service (PaaS) products that use OS-level virtualization to deliver software in packages called containers.
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
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
After, Docker package has been installed, start the daemon, check its status and enable it system-wide using the below commands:
# systemctl start docker
# systemctl status docker
# systemctl enable docker
Finally, run a container test image to verify if Docker works properly, by issuing the following command:
# docker run hello-world
Docker commands
=====================
# yum install -y yum-utils
# yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
# 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
# systemctl start docker
# systemctl status docker
# systemctl enable docker
# docker run hello-world >>>>>>>Test
# docker info
# docker version
# docker >>>> help
# docker search ubuntu >>> search containers
#docker pull ubuntu >>> its available in hub.docker.com
#docker images
# docker rm ubuntu >>> remove image
#docker rename tecmint-web ami-web >>> renaming
# docker run ubuntu cat /etc/issue
# docker ps -l
#docker ps -a >>>> for seeing all containers
#docker start/stop/stats ami-web
# docker run --name ubuntu20.04 ubuntu cat /etc/issue
# docker run -it ubuntu bash
# sudo docker run -dit --name ami-web -p 8080:80 -v /home/user/website/:/usr/local/apache2/htdocs/ httpd:2.4 >>> for apached web
# vi /home/user/website/docker.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Apache from Docker </title>
</head>
<body>
<h1>Its from Docker Apache</h1>
</body>
</html>
#exit
TECH INFO 