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Zabbix item for last line of a log file
Post 303031766 by rbatte1 on Tuesday 5th of March 2019 12:35:33 PM
03-05-2019
Moderator
Maybe I wasn't clear on the initial post. Sorry about that. The process producing the display doesn't have direct access to the file.
We have multiple CentOS servers running various positions of our application testing programme and I'm being asked to get a display together which shows how they're all doing, batch state etc.. We destroy and re-create them all the time, but the Zabbix agent is in our VMWare template already so that is the mechanism of choice to get the data. It's shouldn't be too hard, but I'm stuck.
The server showing the display doesn't have access to the log file directly (NFS, SMB or an SSH password-less connection defined) If we did have, I could simply tail -1 /path/to/log but because we a frequently rebuilding, I'd rather not have to add another few steps and more complexity between them. There's lots to do already when we build them. With Zabbix, I can get the file contents but only for a small file, and these log files I want to read are very large.
We don't dare have Zabbix remote commands enabled because that is an entry point to attack the server. I know I can define the Zabbix item type as log with a key of log[/path/to/file], but then I don't know how to get at the content/last line.
The files will get quite large, but I can set the history low, because after that we just want the current position.
I'm happy to define the type as log if I could get that to work, but all I get back is a large number.
Naturally anything I can define in Zabbix will be added to the existing template so I don't have to set that up every time too.
I'm sure I'm missing something simple,
Robin (feeling like a fool
)
We have multiple CentOS servers running various positions of our application testing programme and I'm being asked to get a display together which shows how they're all doing, batch state etc.. We destroy and re-create them all the time, but the Zabbix agent is in our VMWare template already so that is the mechanism of choice to get the data. It's shouldn't be too hard, but I'm stuck.
The server showing the display doesn't have access to the log file directly (NFS, SMB or an SSH password-less connection defined) If we did have, I could simply tail -1 /path/to/log but because we a frequently rebuilding, I'd rather not have to add another few steps and more complexity between them. There's lots to do already when we build them. With Zabbix, I can get the file contents but only for a small file, and these log files I want to read are very large.
We don't dare have Zabbix remote commands enabled because that is an entry point to attack the server. I know I can define the Zabbix item type as log with a key of log[/path/to/file], but then I don't know how to get at the content/last line.
The files will get quite large, but I can set the history low, because after that we just want the current position.
I'm happy to define the type as log if I could get that to work, but all I get back is a large number.
Naturally anything I can define in Zabbix will be added to the existing template so I don't have to set that up every time too.
I'm sure I'm missing something simple,
Robin (feeling like a fool
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LEARN ABOUT LINUX
nislog
nislog(1M) System Administration Commands nislog(1M) NAME
nislog - display the contents of the NIS+ transaction log SYNOPSIS
/usr/sbin/nislog [-h num | -t num] [-v] [directory...] DESCRIPTION
nislog displays the contents of the NIS+ server transaction log on the standard output. This command can be used to track changes in the namespace. The /var/nis/trans.log file contains the transaction log maintained by the NIS+ server. When updates occur, they are logged to this file and then propagated to replicas as log transactions. When the log is checkpointed, updates that have been propagated to the replicas are removed. The nislog command can only be run on an NIS+ server by superuser. It displays the log entries for that server only. If directory is not specified, the entire log is searched. Otherwise, only those logs entries that correspond to the specified directories are displayed. OPTIONS
-h num Display num transactions from the ``head'' of the log. If the numeric parameter is 0, only the log header is displayed. -t num Display num transactions from the ``tail'' of the log. If the numeric parameter is 0, only the log header is displayed. -v Verbose mode. FILES
/var/nis/trans.log transaction log ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnisu | +-----------------------------+-----------------------------+ SEE ALSO
nis+(1), rpc.nisd(1M), nisfiles(4), attributes(5) NOTES
NIS+ might not be supported in future releases of the SolarisTM Operating Environment. Tools to aid the migration from NIS+ to LDAP are available in the Solaris 9 operating environment. For more information, visit http://www.sun.com/directory/nisplus/transition.html. SunOS 5.10 12 Dec 2001 nislog(1M)