client-local.cfg - Local configuration settings for Xymon clients
The client-local.cfg file contains settings that are used by each Xymon
client when it runs on a monitored host. It provides a convenient way
of configuring clients from a central location without having to setup
special configuration maintenance tools on all clients.
The client-local.cfg file is currently used to configure what logfiles
the client should fetch data from, to be used as the basis for the
"msgs" status column; and to configure which files and directories are
being monitored in the "files" status column.
Note that there is a dependency between the client-local.cfg file and
the hobbit-clients.cfg(5) file. When monitoring e.g. a logfile, you
must first enter it into the client-local.cfg file, to trigger the
Xymon client into reporting any data about the logfile. Next, you must
configure hobbit-clients.cfg so the Xymon server knows what to look for
in the file data sent by the client. So: client-local.cfg defines what
raw data is collected by the client, and hobbit-clients.cfg defines how
to analyze them.
PROPAGATION TO CLIENTS
The client-local.cfg file resides on the Xymon server.
When clients connect to the Xymon server to send in their client data,
they will receive part of this file back from the Xymon server. The
configuration received by the client is then used the next time the
This method of propagating the configuration means that there is a
delay of up to two poll cycles (i.e. 5-10 minutes) from a configuration
change is entered into the client-local.cfg file, and until you see the
result in the status messages reported by the client.
The file is divided into sections, delimited by "[name]" lines. A
section name can be either an operating system identifier - linux,
solaris, hp-ux, aix, freebsd, openbsd, netbsd, darwin - or a hostname.
When deciding which section to send to a client, Xymon will first look
for a section named after the hostname of the client; if such a section
does not exist, it will look for a section named by the operating
system of the client. So you can configure special configurations for
individual hosts, and have a default configuration for all other hosts
of a certain type.
Apart from the section delimiter, the file format is free-form, or
rather it is defined by the tools that make use of the configuration.
LOGFILE CONFIGURATION ENTRIES
A logfile configuration entry looks like this:
The log:FILENAME:SIZE line defines the filename of the log, and the
maximum amount of data (in bytes) to send to the Xymon server. FILENAME
is usually an explicit full-path filename on the client. If it is
enclosed in backticks, it is a command which the Xymon client runs and
each line of output from this command is then used as a filename. This
allows scripting which files to monitor, e.g. if you have logfiles that
are named with some sort of timestamp.
The ignore PATTERN line (optional) defines lines in the logfile which
are ignored entirely, i.e. they are stripped from the logfile data
before sending it to the Xymon server. It is used to remove completely
unwanted "noise" entries from the logdata processed by Xymon. "PATTERN"
is a regular expression.
The trigger PATTERN line (optional) is used only when there is more
data in the log than the maximum size set in the "log:FILENAME:SIZE"
line. The "trigger" pattern is then used to find particularly
interesting lines in the logfile - these will always be sent to the
Xymon server. After picking out the "trigger" lines, any remaining
space up to the maximum size is filled in with the most recent entries
from the logfile. "PATTERN" is a regular expression.
A special type of log-handling is possible, where the number of lines
matching a regular expressions are merely counted. This is
linecount:FILENAME, followed by a number of lines of the form
FILE CONFIGURATION ENTRIES
A file monitoring entry is used to watch the meta-data of a file:
Owner, group, size, permissions, checksum etc. It looks like this:
The file:FILENAME line defines the filename of the file to monitor. As
with the "log:" entries, a filename enclosed in backticks means a
command which will generate the filenames dynamically. The optional
[:HASH] setting defines what type of hash to compute for the file: md5,
sha1 or rmd160. By default, no hash is calculated.
NOTE: If you want to check multiple files using a wildcard, you must
use a command to generate the filenames. Putting wildcards directly
into the file: entry will not work.
DIRECTORY CONFIGURATION ENTRIES
A directory monitoring entry is used to watch the size of a directory
and any sub-directories. It looks like this:
The dir:DIRECTORYNAME line defines the filename of the file to monitor.
As with the "log:" entries, a filename enclosed in backticks means a
command which will generate the filenames dynamically. The Xymon client
will run the du(1) command with the directoryname as parameter, and
send the output back to the Xymon server.
NOTE: If you want to check multiple directories using a wildcard, you
must use a command to generate the directory names. Putting wildcards
directly into the dir: entry will not work. E.g. use something like
dir:‘find /var/log -maxdepth 1 -type d‘
The "du" command used can be configured through the DU environment
variable. On some systems, by default du reports data in disk blocks
instead of KB (e.g. Solaris). So you may want to configure the Xymon
client to use a du command which reports data in KB, e.g. by setting
in the hobbitclient.cfg file.
The ability of the Xymon client to calculate file hashes and monitor
those can be used for file integrity validation on a small scale.
However, there is a significant processing overhead in calculating
these every time the Xymon client runs, so this should not be
considered a replacement for host-based intrusion detection systems
such as Tripwire or AIDE.
Use of the directory monitoring on directory structures with a large
number of files and/or sub-directories can be quite ressource-
hobbit-clients.cfg(5), hobbitd_client(8), hobbitd(8), xymon(7)