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I have isc-dhcp-relay/xenial-updates,now 4.3.3-5ubuntu12.10 amd64 [installed]

working good, how i can move logging this daemon from syslog to custom log file?

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You can't. What you can do is make syslog log that to a separate file (see /etc/rsyslog.d/).

  • Create file /etc/rsyslog.d/dhcp-relay.conf
  • Add the line local7.* -/var/log/dhcp-relay.log
  • restart rsyslog

Also look at the file /etc/rsyslog.d/50-default.conf, maybe you want to change the line where it logs to /var/log/syslog to contain local7.none to avoid double loggings.

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  • ... using what syntax? An example would go a long way towards making this a better answer.
    – Jeff Schaller
    Commented Oct 20, 2020 at 15:47
  • i do not understand your answer if you have no knowledge why write something?
    – Roman
    Commented Oct 20, 2020 at 16:12
  • You can't select a logfile, it is what it is. This is the answer. What you can do is make syslog write the dhcp-messages to a separate file though. I edited my answer.
    – stoney
    Commented Oct 21, 2020 at 5:09
  • worked for dhcpd and not worked for dhcprelay. sorry, your misunderstuded the question. try to studying.
    – Roman
    Commented Oct 22, 2020 at 9:31
  • My first sentence stands - you cannot change the daemon behavior without fiddling with the code to log to another syslog-faciliy (used to be local<somewaht>), now it is system daemon. You can write your own syslog-specs then. Start at the Syslog Documentation. It's not my answer bot your question.
    – stoney
    Commented Oct 23, 2020 at 10:30

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