Need script to rotate logs Post: 302877108

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Top Forums UNIX for Dummies Questions & Answers Need script to rotate logs Post 302877108 by bakunin on Thursday 28th of November 2013 06:53:53 AM

11-28-2013

Registered User

Quote:

Originally Posted by solaris_1977

I have few solaris-10 non global zones, where one application is writing some logs to /var/ovd/ConfigLogs. It keeps increasing all the time, as it is needed by application team as of now. I want a small script, which I can configure in cronjob, which should :
- Run every Saturday 10 PM
- Copy /var/ovd/ConfigLogs to /var/ovd/ConfigLogs.1
- Nullyfy /var/ovd/ConfigLogs
- bzip /var/ovd/ConfigLogs.1
- Next Saturday (Second cronjob), it should repeat, but should ot overwrite /var/ovd/ConfigLogs.1.bz
I am still trying to understand if logadm can help me in this. Can somebody help me for this script to put in cronjob ?

I am no Solaris expert and do not know "logadm", but this should be fairly straightforward. Some things you have to keep in mind:

1. You should - under no circumstances - change the inode of the log, otherwise processes which have still opened this file (inode) would keep writing into it. You need to "zap" the file: replace its contents with a single "EOF"-marker, provided by "/dev/null". Do it this way:

Code:

cat /dev/null > /path/to/logfile

2. If you copy the file to another location this process needs time. In the meantime the process writing to the log might put something into it and you would lose that when you "zap" the file. You will have to decide how big this risk is (based on the frequency with which the logfile gets written - if there is one message per minute the risk of dropping a log message is practically negligeable, if it is 10 messages per second it is considerable). Note, though, that the risk never drops to zero, so if you need complete logs no matter what you will have to elaborate on the process.

3. How to configure a cron entry is in the manual, if you have problems with this i suggest you search for it here, there are examples galore. One thing you have to keep in mind when writing the cron job is the "Cron Error Number One".

I hope this helps.

bakunin

bakunin

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GETBUILDLOG(1)                                                General Commands Manual                                               GETBUILDLOG(1)

NAME

       getbuildlog - download build logs from Debian auto-builders

SYNOPSIS

       getbuildlog package [version-pattern] [architecture-pattern]

DESCRIPTION

       getbuildlog downloads build logs of package from Debian auto-builders. It downloads build logs of all versions and for all architectures if
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       extended regular expressions as described in grep(1).

       If version-pattern is "last" then only the logs for the most recent version of package found on buildd.debian.org will be downloaded.

       If version-pattern is "last-all" then the logs for the most recent version found on each build log index will be downloaded.

OPTIONS

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       -V, --version
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EXAMPLES

       getbuildlog hello 2.2-1 amd64
              Download amd64 build log for hello version 2.2-1.

       getbuildlog glibc "" mips.*
              Download mips(el) build logs of all glibc versions.

       getbuildlog wesnoth .*bpo.*
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AUTHOR

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