Installing native Docker on AlmaLinux 8

[jochenw]

Hi,

I hope, this is the proper place to report this issue. If not, please let me know.

According to get.docker.com, Docker should be installable on AlmaLinux 8 (basically a successor of CentOS 8) with the following steps:

    curl -fsSL https://get.docker.com -o get-docker.sh
    sudo sh get-docker.sh

In practice, this doesn't actually work, due to an error message

    ERROR: Unsupported distribution 'almalinux'

To actually install Docker on AlmaLinux 8, the following changes are necessary:

1. Due to a dependency conflict between Docker on the one side, and buildah, podman, etc. on the other, one needs to do a sudo dnf -y remove runc in advance. (This is not specific to AlmaLinux, the same is necessary on CentOS, and RHEL.)

2. A simple patch must be applied to get.docker.sh (see below). Note, that the patch may result in an invalid download URL for fedora, I was keeping things simple):

     [jwi@gitjndhost ~]$ diff -ub get-docker-orig.sh get-docker.sh
     --- get-docker-orig.sh	2021-04-28 12:10:12.477498011 +0200
     +++ get-docker.sh	2021-04-28 12:03:23.300011495 +0200
     @@ -342,7 +342,7 @@
    	esac
    ;;
   
    -		centos|rhel)
   +		centos|rhel|almalinux)
    	if [ -z "$dist_version" ] && [ -r /etc/os-release ]; then
    		dist_version="$(. /etc/os-release && echo "$VERSION_ID")"
    	fi
    @@ -427,8 +427,8 @@
    	echo_docker_as_nonroot
    	exit 0
    	;;
    -		centos|fedora|rhel)
    -			yum_repo="$DOWNLOAD_URL/linux/$lsb_dist/$REPO_FILE"
    +		centos|fedora|rhel|almalinux)
    +			yum_repo="$DOWNLOAD_URL/linux/centos/$REPO_FILE"
    	if ! curl -Ifs "$yum_repo" > /dev/null; then
    		echo "Error: Unable to curl repository file $yum_repo, is it valid?"
    		exit 1
   

[jhg03a]

RockyLinux is also available now too

[jochenw]

Closing in favour of docker/docker-install#228.