Add suport for EL distros in one-liner install script.

[kaelemc]

This PR enables the one liner install script to support RHEL & other EL counterparts like Fedora, Rocky and CentOS to name a few.

Currently tested on Rocky 9.3. This is in draft PR status while I test other distros & versions.

[kaelemc]

Confirmed working on RHEL 9 (Developer edition) and CentOS 9.

[kaelemc]

Confirmed basic containerlab functionality by running srl-quickstart on:

• Rocky 9.3
• Rocky 8.8
• Fedora Server 40
• RHEL 9 w/Developer Subscription
• CentOS Stream 9
• Ubuntu 22.04 Server

[hellt]

Thanks @kaelemc

Would you mind adding the tested systems here as well?

https://containerlab.dev/install/#quick-setup

I also see that dnf is used to install packages, I guess this rules out ancient systems like centos7 that don't have dnf client? Or maybe it does?

[kaelemc]

Oh yes, I will add the relevant documentation. Thanks for the reminder.

Yes dnf is used to install github cli and for the Fedora docker installation.

RHEL 7 is going EOL this year, and I personally think it's unlikely people would be installing clab on a RHEL 7 based distro so we are probably fine on that front.

[kaelemc]

Scrap that, RHEL7/CentOS already is EOL as of June 2024.

[kaelemc]

Just want your guidance on two things:

1. Should the script perform (or the documentation specify) that users can/should perform the docker postinstall. It makes things easier and cleaner for the user (assuming the machine only runs containerlab because of the security implications etc.), . Effectively means newer users might find it easier to use containerlab out-of-the-box.

2. Should the script install make which is required for vrnetlab? Or should we leave that up to the user to do?

[hellt]

@kaelemc
yes, I always wanted to add the docker user group to this script. I see that it is part of the postinstall, so we should definitely do this while we are at it.

and yes, make we should install as well

[kaelemc]

@hellt Added those two things. Confirmed working on Ubuntu & Rocky.

[hellt]

Thanks again @kaelemc