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Full Discussion: How to grep logs for errors and receive specific additional lines?
Top Forums Shell Programming and Scripting How to grep logs for errors and receive specific additional lines? Post 302855773 by nbsparks on Friday 20th of September 2013 08:13:08 PM
Old 09-20-2013
I threw out 10 lines as an arbitrary number because it could really vary. I would think that 10 lines would be MORE than I need most of the time. And I wouldn't want to hardcode on "Mobcatcher" as it could be any number of server plugins that could fail or error out.

The idea is for me to be able to troubleshoot and diagnose server issues with this subset of the logfile rather than looking at this logfile, noting the time, and then sifting through the main server.log file to get the context I need to troubleshoot.

---------- Post updated at 05:13 PM ---------- Previous update was at 05:11 PM ----------

I suppose that one could parse the [SEVERE] line and then look for any lines within the previous 10-20 lines that mention any of the words used in the same line as the [SEVERE] tag, but that seems overkill and unnecessary complication.
 

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LEARN ABOUT DEBIAN

dhisd

DHISD(8)						    BSD System Manager's Manual 						  DHISD(8)

NAME

     dhisd -- Dynamic Host Information System server.

SYNOPSIS

     dhisd [-D] [-p port] [-d database] [-s services] [-l logfile] [-P pidfile]

DESCRIPTION

     DHIS is a client-server architecture meant to update databases for systems which are assigned a dynamic IP[v4] address.

     By the means of a DHIS client a host which is assigned a dynamic IP address (either from its ISP or from DHCP) is able to communicate with a
     DHIS server in order to advertise its newly acquired IP address.

     DHIS comprises a UDP based protocol to achieve this purpose.

     A DHIS client has a unique identification number and a set of authentication keys, runs in background, and attempts to reach its server.

     The DHIS server (permanently online) listens to UDP messages from its clients and authenticates these against its knowledge of keys. When
     authentication is successful the DHIS server updates one or more databases with the newly received IP address for the given client.

     The server then keeps sending, every period of time, check requests to each of its connected clients. These need to be acknowledged. If not
     the server will consider, on an individual basis, that the client has disconnected and will again update the databases to an offline state.

     Alternativelly the server may receive an OFFLINE_REQ packet from the client, in which case the DNS record is updated at once and the online
     state droped.

OPTIONS

     -D      Increase debug level.

     -p port
	     Specify port to listen on. If not specified, the default is port 58800.

     -d database
	     Use an alternative database file instead of /etc/dhis-server/dhis.db.

     -s services
	     Use an alternative database file instead of /etc/dhis-server/services.db.

     -l logfile
	     Use an alternative log file instead of /var/log/dhisd.log.

     -P pidfile
	     Use an alternative PID file instead of /var/run/dhisd.pid.

FILES

     /etc/dhis-server/dhis.db
	     DHIS client database.  Contains the credentials of clients.

     /etc/dhis-server/services.db
	     DHIS service database.  Contains a list of services and the location of the corresponding DHIS engine plugins.

SEE ALSO

     dhis-genkeys(8)

AUTHOR

     dhisd has been written by Joao Cabral <jcnc@dhis.org>.

     This manual page was written by Guus Sliepen <guus@debian.org> for the Debian GNU/Linux system.

Debian GNU/Linux						   June 1, 2019 						  Debian GNU/Linux
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