Tag Archives for CentOS
Create a Linux Boot ISO image to start via Kickstart
Getting tired of creating new VM’s, and don’t want to clone for a particular reason but want them standardized? Easy. By creating a boot image that immediately starts a kickstart installation, you can completely automate creating a VM regardless of … Continue reading
Install VirtualBox Guest Additions on CentOS 5.x
This has been documented many times before, but for some reason installing VirtualBox guest additions on CentOS is a pain. To install them: yum install kernel-devel gcc either ln -s /usr/src/kernel/[current version] /usr/src/linux or export KERN_DIR=/usr/src/kernel/[current version] Then the usual … Continue reading
Fix Logwatch emails on Zimbra hosts
We’ve had an issue for a while where Logwatch emails are not getting through properly in Zimbra with Zimbra complaining about relay issues. While our migration to Zimbra will be the subject of another, much longer post, our last remaining … Continue reading
HP dc5800 Linux Boot Fix
If your attempting to install CentOS 5.2 on a HP dc5800 and it’s hanging, you need to alter the boot line during install. linux pci=nommconf This will allow the CentOS Installation to continue.
Setting up stronger password policy rules in Linux – Part II
In a previous post we discussed how to setup stronger password policy rules in Linux and found out that any changes we make are not reflected back to existing accounts. So how do we make these changes retroactively apply to … Continue reading
Setting up stronger password policy rules in Linux
Increased password security is no longer an optional item in setting up a secure system. Many external organizations (such as PCI) are now mandating security policies that can have a direct effect on your systems. By default, the account and … Continue reading
Setup SAN disk for use in a Linux Veritas cluster
For this particular exercise we’re going to go through the entire process of provisioning disk for use in a VCS cluster. We will use EMC Symmetrix disk zoned and masked to a RHEL 4u6 host as the foundation.
Fix Linux time sync issues in VMware
We’ve been having issues with our VMware guests keeping accurate time and didn’t want to break the best practices of using NTP like we normally do on our non-vm hosts so I ended up doing way more research on how … Continue reading
Kickstarting a virtualized guest
If you need to provision hosts at a regular interval, kickstarting an installation is an effective and productive way of systematically creating guests. All of our Linux builds are now done via kickstart and as a result we have drastically … Continue reading