Permanently enable a SCL

Question

Is there a way that I can permanently enable a SCL?

I've installed rh-php56, and I would like to make sure that it is loaded every time I ssh into my machine.

I am currently running CentOS 7.

Solution 1

using scl enable actually opens a new shell inside your current one, which is quite unclean, especially if done from a login script.

You should place, instead, in your ~/.bash_profile:

source /opt/rh/rh-nginx18/enable

or:

source scl_source enable rh-nginx18

The latter is more "elegant" as it is independent from the actual installation path.

This has the effect of loading the environment in your current shell.

Solution 2

Redhat proposes placing a file in /etc/profile.d, i.e. for python:

$ cat /etc/profile.d/enablepython33.sh
#!/bin/bash
source scl_source enable python33

As this works for the devtools under centos for me you could try this.

Comments

[Michael Hampton]

One problem with this is that your resulting bash is no longer a login shell. And you can't make it a login shell. If you try, you'll fork bomb your system. This may work in some circumstances, but it's not the recommended method.

[Jarrett Meyer]

This is what I do. I've created an /etc/profile.d/scl_enable.sh file with all of my scl files in that one file.

[Lance Kind]

CAREFUL! Adding an scl command like the above just got me a "frozen" login because the script got stuck for some reason. Have this page for a handy reference for when you get locked out: serverfault.com/questions/94503/…

[Dan Vatca]

The accepted response is DANGEROUS, and should be somehow demoted or removed. Adding this so maybe people will notice it before forkbombing themselves :)

[Michael Chourdakis]

This fork bombed me and should be instantly removed.

[retgoat]

this also works on amazon linux Linux ip-10-1-129-214 4.14.238-125.422.amzn1.x86_64 #1 SMP Tue Jul 20 20:51:46 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux