Location of IMAP and POP3 configuration in Cpanel
Right here: /usr/lib/courier-imap/etc/…
Monthly Archives November 2009
Find files modified/created within N days ago
This proved to be useful in cleaning up a compromised site. List all the files created or modified within a certain time frame — in this case we are looking 30 days in the past: find . -mtime -30 -type f -print If you want to delete all files created/modified n days ago, you can […]
Networking issues when cloning a Debian installation
When cloning a Debian system, be sure to remove everything in: /etc/udev/rules.d/*persistent-net.rules This will allow the new hardware to detect properly.
Sorting disk usage by folder in Linux
Normally you would use something like this: du -k | sort -nr > sorted.txt But the output is not pretty since we don’t like counting bytes. This will sort it in human readable format: du -k | sort -nr | awk ‘ BEGIN { split(“KB,MB,GB,TB”, Units, “,”); } { u = 1; while ($1 >= […]
Pre-analysis of a DDOS attack on a Cpanel or Linux server
Determine the nature of the attack (SYN, GET, ect): netstat -nat | awk ‘{print $6}’ | sort | uniq -c The following will list all the IPs connecting to the server in order of most connections. netstat -plan|grep :80|awk {‘print $5’}|cut -d: -f 1|sort|uniq -c|sort -nk 1 We can see which domains are most active […]
Tracking SPAM on a Cpanel Server
If you are using a cpanel/WHM server then the MTA will be Exim by default. Enable Mailheaders by running /scripts/easyapache script. After that, check the mail header using: exim -Mvh <message id> From that you will able to find the source of spam.
Setting up Adaptec Storage Manager on a headless Ubuntu/Debian server
Adaptec RAID cards have huge performance gains over other cards, but the management features in Linux stink. Really bad. If you don’t have a GUI installed, you cannot set up monitoring or alerts, but thankfully you can use a Windows machine to set this up remotely. Additionally, there are no .deb packages so we have […]
Setting up a large disk array in Linux through LVM
A very large disk array (hardware RAID) combined with LVM (Logical Volume Management) will give you a vast amount of flexibility. Without LVM, you’ll have to reboot the entire machine to realize the new space when adding RAID members. Using LVM, you can take advantage of OLE (On Line Expansion) and expand your existing volumes […]
Installing mod_limitipconn on a Cpanel server
Absolutely essential in a shared hosting environment. This example is relevant to Apache 2.2.x. ############# ## Compile mod_ipconnlimit cd /root wget http://dominia.org/djao/limit/mod_limitipconn-0.23.tar.bz2 tar xjf mod_limitipconn-0.23.tar.bz2 cd mod_limitipconn-0.23 /usr/local/apache/bin/apxs -cia mod_limitipconn.c ### this needs to be redone after each apache recompile ## in WHM, add to apache Pre VirtualHost Include (all versions) <IfModule mod_limitipconn.c> # Set […]