On Fri, Oct 23, 2020 at 04:27:34PM +0000, Harold Pritchett wrote:
> I'm trying to install DB2 on a CentOS 7 server. The problem I'm
> seeing is that the Apache httpd server fails to pick up the db2
> environment variables. On an older version running under CentOS 5
> this was done by inserting the following lines into the httpd start
> script in /etc/sysconfig/httpd:
>
> if test -f /db2home/db2inst1/sqllib/db2profile; then
> . /db2home/db2inst1/sqllib/db2profile
> fi
>
> Under CentOS 7's systemctl system this no longer works. I need a
> clue as to where to start looking for where to put this so it will
> be sourced when the Apache server starts. I have googled this and
> can find nothing relevant. I even did a "find / -name httpd -print"
> and didn't find anything looking promising.
In non-systemd systems, httpd was started by a shell script
(/etc/rc.d/init.d/httpd) which sourced the file /etc/sysconfig/httpd,
so you could embed shell code in the file and it would be evaluated.
In systemd systems, the httpd.service unit has:
EnvironmentFile=/etc/sysconfig/httpd
For systemd units, setting this will cause the systemd unit to read in
the file for variables, but it ignores anything that isn't a simple
'foo=bar' syntax. It doesn't evaluate shell scripts.
HOWEVER, the logic of your shell script is something that can be
supported by systemd units. You can say:
EnvironmentFile=-/db2home/db2inst1/sqllib/db2profile
and it will only try to source that file for variables if it exists.
So, what you should do is create a directory and file within it
called:
/etc/systemd/system/httpd.service.d/override.conf
With these two lines in it:
[Service]
EnvironmentFile=-/db2home/db2inst1/sqllib/db2profile
Then run (as root) 'systemctl daemon-reload', and it should
conditionally load the environment variables on startup from that file
if the file exists.
This assumes that /db2home/db2inst1/sqllib/db2profile doesn't have
more shell syntax in it, of course.
See for more details:
https://www.freedesktop.org/software/systemd/man/systemd.exec.html#EnvironmentFile=
--
Jonathan Billings <billings@xxxxxxxxxx>
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