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Re: How to debug systemd script?

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On Mon, Mar 28, 2016 at 01:00:35PM +0100, Oliver Elphick wrote:
> I have installed Debian alongside Linux Mint and wish to have
> PostgreSQL use the same database.  So I have copied the system
> configuration files in /etc/postgresql from the Linux Mint partition.
> They point to the PostgreSQL data files in /lvhome/postgresql.  
> 
> This works in Linux Mint but not in Debian; PostgreSQL does not start.
> There is nothing in the logs of either system or PostgreSQL. It works
> if I call pg_ctl or if I run postgres directly.
> 
> I put set -x in the init script. When it is run, we see:
> 
> # /etc/init.d/postgresql start
> ...
> + echo -n Starting postgresql (via systemctl): postgresql.service
> Starting postgresql (via systemctl): postgresql.service+
> log_daemon_msg_post Starting postgresql (via systemctl)
> postgresql.service
> + :
> + /bin/systemctl start postgresql.service
> + rc=0
> ...
> 
> 
> There is a long pause at /bin/systemctl, but no error is indicated.
> However, the server is not started.
> 
> How can I find out what is going on to stop the normal init script from
> working? Is there some way to force systemctl to log what it is doing?
> If it does log, where does it put the log?

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=731862

Near the very end it suggests:
strace -f -o /tmp/strace.log -s 2048 -p 1 & systemctl restart postgresql.service

Then, after a couple of seconds, fg into the strace process, cancel it, and then
see it the strace.log helps.

-- 
The media's the most powerful entity on earth. 
They have the power to make the innocent guilty 
and to make the guilty innocent, and that's power.
 -- Malcolm X

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Thread

How to debug systemd script? Oliver Elphick <olly@lfix.co.uk> - 2016-03-28 14:20 +0200
  Re: How to debug systemd script? chrisb@localhost.localdomain - 2016-03-28 16:00 +0200
    Re: How to debug systemd script? Oliver Elphick <olly@lfix.co.uk> - 2016-03-28 17:20 +0200
      Re: How to debug systemd script? chrisb@localhost.localdomain - 2016-03-29 04:40 +0200

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