On Oct 31, 2011 2:54 AM, "suvayu ali" <fatkasuvayu+li...@gmail.com> wrote: > > On Mon, Oct 31, 2011 at 05:22, T.C. Hollingsworth > <tchollingswo...@gmail.com> wrote: > > Usually its easier to debug daemon problems by just running them on > > the command line. Look for the ExecStart line in > > /lib/systemd/system/<name>.service or if it uses classic initscripts > > check the corresponding file in /etc/init.d for the command that is > > run. That way you can easily run it through strace if you need to. > > > > That being said, on Fedora 16, systemd redirects stdout and stderr to > > syslog, so you can view the output from the daemons in > > /var/log/messages. Unfortunately, IIRCC F15 systemd does not do this, > > so edit /etc/systemd/system.conf and add a line that says > > "DefaultStandardOutput=syslog". The next time you boot, all daemons' > > stdout and stderr will be stored in syslog so you can view it > > afterward, either in /var/log/messages or with a viewer like > > KSystemLog. Messages from the kernel are also stored there, so you > > can see everything in one place. > > > > You can also set DefaultStandardOutput to "syslog+console" to have it > > output to the console as well, but that can be problematic because > > systemd starts many services in parallel. (If you decide to do that, > > make sure to remove "rhgb quiet" from your kernel command line as well > > so Plymouth gets out of the way and kernel messages are printed to the > > console also.) > > > > It's also rather easy to run systemd native services through strace, > > just run copy the .service file from /lib/systemd/system to > > /etc/systemd/system and append strace the command on the ExecStart > > line. When you're done, just rm the file in /etc and the one in /lib > > will take back over. Classic initscripts are a little harder: you > > have to find the appropriate line in the script and change it, and > > then change it back when you're done. > > > > That is an amazingly clear "systemd debugging howto". Thanks a lot, I > have been putting off debugging ddclient because of my unfamiliarity > with systemd. Not any more. :) > > PS: Have you considered putting this on the fedoraproject wiki?
I have marked this thread. I hope T.C. is interested in writing something up, since he clearly has a better understanding than I. If not, I will. This is great info, thanks!
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