Mochabomb

Ever had a process die and not know it until trying to use it? Last year dovecot was dying and running “service dovecot status” shows that - this script was born to address this for many processes. Its a work in progress, and please share any ways to make it better. Cron this to run every 15 minutes, and minor adjustments will be needed for other systems, daemons.

Note: this was written for RHEL systems - make minor adjustments for other systems/daemons

The textfile is located here and the config file looks like:

#
email: user@example.com
pager: 4155551212@messaging.sprintpcs.com
# service: commented_out
service: httpd
service: dovecot
service: mysqld
service: postfix
service: sshd
service: MailScanner
service: proftpd
service: syslog

From the comments in the script:

“Created this script after I had several misconfigurations across many servers - this will
use values from the config files for testing - a wrapper for fail2ban-regex and eliminating
late-night, low-on-caffeine human errors in testing your config. Could also be used: after an
update to verify the configuration, run weekly cron, create a fail2ban report..”

Script is here: http://mochabomb.com/software/fail2ban-check.txt

I made some changes to a VBD based Xen server - here’s what not to do:

1. Use a password in the httpd cert - if I ran xm console server I did not see that prompt - needed to use the vnc/gui to see this - entered it and got closer
2. Spaces in device names using system-config-network - eg; eth0 was actually saved as "eth0 " - that extra space messed up starting of "eth0" and other network devices. I will bugzilla this one.
3. Pretty GUI’s are not a sign of weakness - this time it showed me what 6 hours of console hacking did not. Score +1 for the GUI!!!

Network trouble: www.linuxfromscratch.org/pipermail/lfs-support/2003-December/021076.html
solution: cd /etc; find . -print | grep ifcfg - delete any that are easily replaced - I removed all but the primary IP interface.

Mounting xen vbd img files:
http://www.brandonhutchinson.com/Mounting_a_Linux_LVM_volume.html
http://www.novell.com/coolsolutions/tip/19568.html

Now if anyone share how to effectively mount Linux LVM from a server.img file that looks like - I can mount the ext3 boot partition, but not the Linux LVM using lomount or other techniques:

[root@server vm]# fdisk -l /dev/loop0

Disk /dev/loop0: 16.7 GB, 16777216000 bytes
255 heads, 63 sectors/track, 2039 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

      Device Boot      Start         End      Blocks   Id  System
/dev/loop0p1   *           1          13      104391   83  Linux
/dev/loop0p2              14        2039    16273845   8e  Linux LVM

as Lundberg would say “That would be great”

From a Drupal install, got a blank page when logging in….

[Mon Nov 05 13:20:36 2007] [error] [client 71.139.36.123] PHP Fatal error:
Allowed memory size of 16777216 bytes exhausted (tried to allocate 92160 bytes) in
/home/someuser/public_html/modules/event/event_timezones.inc on line 331, referer: http://example.com/

Up the memory in php.ini a few MB, restart httpd and all was working..