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syslog-ng shows no hostname if it is supplied by dhcp-server
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DawgG
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PostPosted: Thu Jul 16, 2015 10:15 am    Post subject: syslog-ng shows no hostname if it is supplied by dhcp-server Reply with quote

i have some hosts that get their hostname with dhcp only (no /etc/hostname and /etc/conf.d/hostname ist empty; MACs registered on DHCP-server). their syslog-ng is configured to additionally log to a loghost over the network. some new installations show up as (none) on the loghost and the local /var/log/messages-file if the systems boot with the supplied initscripts.

the hostname is only shown if syslog-ng is restarted again after the "normal" system-start; eg:
Code:
Jul 16 11:59:19 (none) root[6793]: blabla
Jul 16 11:59:29 (none) syslog-ng[747]: syslog-ng shutting down; version='3.6.2'
Jul 16 11:59:29 zb-opac-606 syslog-ng[6838]: syslog-ng starting up; version='3.6.2'
Jul 16 11:59:34 zb-opac-606 root[6847]: blabla

what's the reason for this and how can it be fixed? is there a dep missing in some initscript? hostname (that syslog-ng depend on) ist started:

Code:

Jul 16 12:07:12 (none) ntpd[1179]: peer 10.10.1.238 now valid
Jul 16 12:07:16 (none) ntpd[1179]: peer 10.10.1.239 now valid
zb-opac-603 ~ # /etc/init.d/hostname status
 * status: started


when the hostname is set in a static file this does not happen; but even though those hosts are pretty static i want to keep configuring their hostnames with dhcp only.
is there a better way than restarting syslog-ng after system-boot?
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Roman_Gruber
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Joined: 03 Oct 2006
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PostPosted: Thu Jul 16, 2015 11:20 am    Post subject: Reply with quote

I am not a specialist

Quote:
is there a better way than restarting syslog-ng after system-boot?


You mean restarting after dhcp figured out who is who.
There may be a way to make it depend on net or something or just generate a rule to restart it.

Yuo need to code it that way that the default settings cause a regular check until you get something else as the default. some sort of timeout to try again.

i talk about hte 169.xx.xx.xx adress range which is asigned by dhcp when the network node is "dead"....

maybe doable with some sort of /etc/init.d/script ...
HAve you checked dhcpcd settins and syslog-ng settings for anything which can be used in this fashion?
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DawgG
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PostPosted: Thu Jul 16, 2015 12:20 pm    Post subject: Reply with quote

Quote:
There may be a way to make it depend on net or something or just generate a rule to restart it.

that was my first thought but it is definitely for a reason that the logger starts way before the net.
i compared this to older installs i have and in those syslog-ng "knows" the hostname straight from the start - that's what bothers me a little bit. the older install is syslog-ng-3.4.8; the new is syslog-ng-3.6.2

i'll test around a little more but will probably go for the cheap way of restarting syslog-ng with /etc/local.d/XX-bla.start - in case logged info on a client from before the network start is needed it will most likely not matter if the hostname in this case is (none).
THX for your input!
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