Author Archives: pingd

Installing ZFS RAID-Z on CentOS 6.2 with SSD caching.

Posted on May 17, 2012 by pingd

Updated August 16th, 2012 I recently had a project that required data storage with deduplication, data integrity assurance, and hardware fault tolerance. Instead of going with a traditional hardware RAID solution I opted to test out ZFS. My configuration utilized … Continue reading →

Posted in Linux Guides | Tagged atime, centos 6.2, compression, data compression, data integrity, deduplication, disable atime zfs, fault tolerance, raid alternative, raid-5, raid-z, spl, ssd caching, zfs, zfs on centos, zfs on linux, zfs raid-z, zpool | 8 Comments

KVM Hardware Virtualization on CentOS 6.2 Dedicated Servers

Posted on May 14, 2012 by pingd

I wrote this guide to show you how to do a proper KVM setup on your CentOS dedicated server. We will be using VNC and connecting to the dedicated server remotely from your workstation. I realize there are a lot … Continue reading →

Posted in Linux Guides, Virtualization | Tagged bridge-utils, centos, centos 6.2, dedicated server, hardware virtualization, hvm, kernel-based virtual machine, kvm, libvirt, network bridge, no-gui, qemu, remotely hosted server, vcpus, virsh, virt-install, vnc, vncdisplay, vt-x | 2 Comments

Can’t remove or re-add a cPanel addon or parked domain?

Posted on May 4, 2012 by pingd

Sometimes you may find that a domain just won’t go away from cPanel. You may be trying to simply remove an addon domain or a parked domain, or you may be trying to re-add a domain that was at some … Continue reading →

Posted in cPanel Guides | Tagged can't remove addon domain, can't remove domain, can't remove parked domain, cpanel remove domain manually, domain already exists, duplicate domain | Leave a comment

Download a backup over 2GB through cPanel instead of Apache.

Posted on May 4, 2012 by pingd

Apache/FTP in some configurations can’t serve files that are over 2GB. This has been largely corrected on most HEL/CentOS cPanel servers, but there are legacy exceptions. There is a way to get such a large file via a cPanel function. … Continue reading →

Posted in cPanel Guides | Tagged 2gb file limit, apache 2gb limit, download backup through cpanel, getbackup, large backup download | Leave a comment

Secondary Exim Port for cPanel and WHM.

Posted on May 3, 2012 by pingd

Some ISPs block outbound connections to servers on port 25 for SMTP. This is becoming less common, but still occurs on smaller or foreign ISPs. The reason they block this port is to prevent compromised client computers, especially botnets, from … Continue reading →

Posted in cPanel Guides, E-Mail & SMTP Guides | Tagged cpanel exim, exim on another port, exim open port 26, exim open secondary port, isp blocking port 25, open secondary port, port 25 blocked, secondary smtp port, service configuration, service manager, whm exim | Leave a comment

See logged in users on CISCO IOS and disconnect them.

Posted on April 28, 2012 by pingd

So you may want to see who else is accessing the switch or router that you’re on. Sometimes this is because you get a write error when trying to save the running config. The error would be something like: This … Continue reading →

Posted in CISCO IOS Guides | Tagged cisco ios, clear line vty, Device or resource busy, disconnect ios user, drop ios user, kick ios user, line session, other users on switch, running config, startup-config file open failed, systat, terminal lines, vty, write config | Leave a comment

Disable ModSecurity For Single Vhost

Posted on April 27, 2012 by pingd

Some times you may find that a script trips a ModSecurity rule, but the rule is useful for general security on the box. If it’s your own site, it’s easy enough to change the code. However if it’s a customer’s … Continue reading →

Posted in cPanel Guides, Linux Guides | Tagged disable mod security, httpd.conf, modsec, modsecurity, modsecurity rules, mod_sec, mod_security, vhost | Leave a comment

Kill All Sleeping MySQL Connections

Posted on April 26, 2012 by pingd

Sometimes you may find that your server has a ton of MySQL connections with their state set to “Sleep” This will clear out those connections. You will need to look at your MySQL config and see how long you’re allowing … Continue reading →

Posted in Bash One-Liners | Tagged kill sleeping connections, max client connections, mysql management, mysqladmin, one liner, sleeping client connections, while loop | Leave a comment

CentOS 6 Yum-Cron Automatic Updates

Posted on April 24, 2012 by pingd

Some of us prefer the yum-cron method of automatic updates. CentOS 6 shipped out with a daemonized updater that may not suit your particular needs. Here is the proper procedure for switching over to yum-cron: You should then run a … Continue reading →

Posted in Linux Guides | Tagged automatic updates, centos, centos 5, centos 6, centos automatic updates, centos updates, chkconfig, yum install, yum-cron, yum-updatesd | Leave a comment