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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 CENTOS
kproplog
KPROPLOG(8) MIT Kerberos KPROPLOG(8) NAME
kproplog - display the contents of the Kerberos principal update log SYNOPSIS
kproplog [-h] [-e num] [-v] kproplog [-R] DESCRIPTION
The kproplog command displays the contents of the KDC database update log to standard output. It can be used to keep track of incremental updates to the principal database. The update log file contains the update log maintained by the kadmind(8) process on the master KDC server and the kpropd(8) process on the slave KDC servers. When updates occur, they are logged to this file. Subsequently any KDC slave configured for incremental updates will request the current data from the master KDC and update their log file with any updates returned. The kproplog command requires read access to the update log file. It will display update entries only for the KDC it runs on. If no options are specified, kproplog displays a summary of the update log. If invoked on the master, kproplog also displays all of the update entries. If invoked on a slave KDC server, kproplog displays only a summary of the updates, which includes the serial number of the last update received and the associated time stamp of the last update. OPTIONS
-R Reset the update log. This forces full resynchronization. If used on a slave then that slave will request a full resync. If used on the master then all slaves will request full resyncs. -h Display a summary of the update log. This information includes the database version number, state of the database, the number of updates in the log, the time stamp of the first and last update, and the version number of the first and last update entry. -e num Display the last num update entries in the log. This is useful when debugging synchronization between KDC servers. -v Display individual attributes per update. An example of the output generated for one entry: Update Entry Update serial # : 4 Update operation : Add Update principal : test@EXAMPLE.COM Update size : 424 Update committed : True Update time stamp : Fri Feb 20 23:37:42 2004 Attributes changed : 6 Principal Key data Password last changed Modifying principal Modification time TL data ENVIRONMENT
kproplog uses the following environment variables: o KRB5_KDC_PROFILE SEE ALSO
kpropd(8) AUTHOR
MIT COPYRIGHT
1985-2013, MIT 1.11.3 KPROPLOG(8)