NAME

       mergelogs - merge and consolidate web server logs

SYNOPSIS

       mergelogs  -p penlog [-c] [-d] [-j jitter] [-t seconds] server1:logfile1 [server2:logfile2
       ...]

EXAMPLES

       mergelogs -p pen.log 10.0.0.1:access_log.1 10.0.0.2:access_log.2

       mergelogs -p pen.log 10.0.18.6:access_log-10.0.18.6 10.0.18.8:access_log-10.0.18.8

DESCRIPTION

       When pen is used to load balance web servers, the web server log file lists  all  accesses
       as coming from the host running pen. This makes it more difficult to analyze the log file.

       To  solve  this, pen creates its own log file, which contains the real client address, the
       time of the access, the target server address and the first few bytes of the requests.

       Mergelogs reads pen's log file and the  log  files  of  all  load  balanced  web  servers,
       compares  each  entry  and  creates  a  combined  log file that looks as if the web server
       cluster were a single physical server.  Client addresses are replaced with the real client
       addresses.

       In  the  event  that  no  matching  client address can be found in the pen log, the server
       address is used instead. This should never happen, and is meant as  a  debugging  tool.  A
       large  number  of these indicates that the server system date needs to be set, or that the
       jitter value is too small.

       You probably don't want to use this program. Penlog is a much more elegant and  functional
       solution.

OPTIONS

       -c     Do not cache pen log entries. The use of this option is not recommended, as it will
              make mergelogs search the entire pen log for every line in the web server logs.

       -d     Debugging (repeat for more).

       -p penlog
              Log file from pen.

       -j jitter
              Jitter in seconds (default 600). This is the maximum variation in  time  stamps  in
              the  pen and web server log files. A smaller value will result in a smaller pen log
              cache and faster processing, at the risk of missed entries.

       -t seconds
              The difference in seconds between the time on the pen server and UTC.  For example,
              this is 7200 (two hours) in Finland.

       server:logfile
              Web server address and name of log file.

AUTHOR

       Copyright (C) 2001-2015 Ulric Eriksson, <ulric@siag.nu>.

SEE ALSO

       pen(1), webresolve(1), penlog(1), penlogd(1)

                                              LOCAL                                  MERGELOGS(1)