Some times I’ll run into an Ubuntu install where “vi” does not work as expected. For example the backspace and arrow keys will in insert mode will add characters. Turns out Ubuntu installs vim-tiny by default which is a stripped down (and historically compatible) version of vi. The solution is just to install the full version:
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sudo apt-get install vim |
This post post gives a very effective way to cause TCP connections to be more rapidly recycled: http://ihazem.wordpress.com/2012/02/07/reducing-time_wait-socket-connections-recyclereuse/
AIDE or Advanced Intrusion Detection Environment is a great tool for host based system integrity monitoring. AIDE will maintain a database of checksums on the content and attributes of critical system files. If these files change then a notification email will be sent. Here’s the homepage for the AIDE project: http://aide.sourceforge.net/ Installing AIDE is easy since it’s available via yum:
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yum install aide |
Edit the configuration file at /etc/aide.conf and make the following changes: Change “verbose” from 5 to 0. Change rule for “/var/log/lastlog” from “LSPP” to “LOG” To setup just do:
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/usr/sbin/aide --init cp /var/lib/aide/aide.db.new.gz /var/lib/aide/aide.db.gz |
Also add a daily cronjob that runs a check operation:
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0 5 * * * /usr/sbin/aide --check |
This job will send notification email to “root”. Make sure “root” is aliased to an appropriate address so the notifications will actually be received. The procedure when you receive a notification should be to: Review the changed files and confirm that the changes are legitimate. Update the aide
Here’s a good tool for finding malware in a site: http://www.rfxn.com/projects/linux-malware-detect/ It’s easy to install as follows: Download and unpack.
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wget http://www.rfxn.com/downloads/maldetect-current.tar.gz tar -xvzf maldetect-current.tar.gz cd maldetect-1.4.1 |
Install
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./install.sh |
Configure email alerts. Edit /usr/local/maldetect/conf.maldet and change the following parameters:
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email_alert=1 email_addr="support@reliablepenguin.com" |
Always handy to have sed in your bag of tricks:
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sed -i 's/fromtext/totext/g' /path/to/my/file |
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