But you might have noticed we didn't extract it & that's the one difference ADD & COPY commands have, ADD command will automatically extract the archive at the destination folder.Īlso we could have used ADD in place of copy, “ADD data/nf /etc/httpd/conf/nf “.ĮXPOSE command will open the mentioned port on the docker image to allow access to the outside world. Here we have used the COPY command to copy nf from the data directory to the default location of nf on the docker image.Īnd we then used ADD command to copy a tar.gz archive to apache's document directory to serve content on the webserver. they are used to copy the files to docker image with one difference. We can also ask it to create a directory or to install some other packages.ĬOPY data/nf /etc/httpd/conf/nfĬOPY & ADD command almost serve the same purpose i.e.

Here we have asked RUN to update our system & then install apache on it.

Now RUN command is responsible for installing or changing the docker image as we see fit. We can add a number of labels but it's recommended to avoid unnecessary labels.

They are used to pass information like the Maintainer of the docker image, Version number, purpose, or some other remarks. There are multiple ways to install Docker on Linux distributions.LABEL Remarks='This is a dockerfile example for Centos system'īoth fields MAINTAINER & LABEL Remarks are called labels. ~]$ docker info ~]$ docker psĬommand to enable starting of Docker service on boot: ~]$ sudo systemctl enable dockerĬommand to stop Docker service: ~]$ sudo service docker stop Step 6: Verify the installation by running some docker commands. After successful execution of the command, logout and login with the user for changes to take effect. In this command, the username is geeks and group name is docker. This is required so that user can execute the commands without using sudo privileges. If Docker service is not running then start the Docker service ~]$ sudo service docker start Step 5: Add user to the Docker group Steps to install Docker on Amazon Linux AMI, CentOS, Fedora & RHEL 64bit Step 1: Login into the server via SSH Step 2: Update the packages using YUM utility with sudo privileges ~]$ sudo yum update -y Step 3: Install Docker using YUM utility ~]$ sudo yum install docker -y Step 4: Check the Docker engine version ~]$ docker -version Step 5: Check if Docker service is running ~]$ docker info

Yum install docker rhel