On Fri, 10 May 2013, Erik Steffl wrote:
On Ubuntu (uses upstart):
I would like to have a dynamically created data as part of rsyslog
(essentially host id that I don't know before the host is created/started).
What is the best way to achieve this? I see that there is a way to get
environment variable in rsyslog config (using getenv) but since rsyslog is
started by init it has no env variables (i.e. the variables in
/etc/environment or /etc/profile.d/* are not set).
There is /etc/default/rsyslog but I would like to avoid changing system
files plus not sure how to make sure it's changed before the system starts
(it's a shell script so I guess I could add a line there
HOST_ID=$(getHostId))
thanks!
Currently, the only way to set a variable that rsyslog would use across the
board would be to modify the config file (or an included config file) and then
restart rsyslog.
But I'm not understanding what it is that you are trying to do.
Rsyslog doesn't have any internal variable for the system hostname, it asks the
OS.
It can extract data from logs and use it, but that is a per log message thing,
not something you can set to use with future log messages (although, that
concept has been discussed)
With a better understanding of the bigger problem (as opposed to the narrow
question of how to set a variable inside rsyslog), it may be possible to come
up with some other solution.
David Lang
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