If you use software RAID at boot time, either for your /boot or / partition, it may not assemble at the correct time and prevent a successful boot. This can be confusing to track down as a cause if one RAID that’s a physical volume of a volume group assembles but another PV in the […]
When installing Windows 2016 using KVM virtualization we ran into an issue where the installer just hangs on the Windows logo with no output. It appears there is an incompatibility with with the some processor architectures and the installer (this specific one was Sandy Bridge). Add this to your kvm xml file to fix it: […]
When converting CentOS 7 OpenVZ systems to KVM sometimes there is no login prompt after loading services. The machine is otherwise operating correctly. Here’s the fix to get the login prompt back: mv /etc/systemd/system/getty.target.wants/getty\@tty2.service /etc/systemd/system/getty.target.wants/getty\@tty1.service Afterwards the keyboard input may not work. Rebuilding the initial ramdisk will fix that: dracut -f
Quick fix… Rebuild the ramdisk. If you are using a rescue disk and are compiling for a different kernel version replace $(uname -r) with your kernel version: dracut –mdadmconf –fstab –add=”mdraid” –filesystems “xfs ext4 ext3 tempts devotes syses proc” –add-drivers=”raid1″ –force /boot/initramfs-$(uname -r) $(uname -r) Add the following to /etc/default/grub inside the quotes for the […]
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Some newer version of OS X aren’t very verbose when it comes to security restrictions when trying to run a program that’s been downloaded. It may appear to crash and you can try to run it from the command line with: # open ./downloadedpackage.app That will get you the error: LSOpenURLsWithRole() failed with error -10810 for […]
When setting up mirroring (and witnessing) among SQL Server instances when the servers are configured using Active Directory it will automatically try to auth using the ID of the server. You need to grant CONNECT permissions on the endpoint on each server for the other server that will be connecting to it (or two if […]
On certain Citrix VPX installations the ability to set a gateway is not in the setup wizard as you are initially required to connect to the installation from the same network. After logging in using: Username: nsroot Password: nsroot You can set the gateway with similar syntax to adding static routes on most systems: add […]
Ubuntu doesn’t seem to process MTU path discovery the same as other operating systems. When receiving a packet larger than the MTU it stops processing at the MTU length and then determines the packet to be too short as it doesn’t match the packet header. A quick resolution to this is to lower the MTU […]
On SuperMicro motherboards you will sometimes get the following error when using certain functionality of the the IPMI config utility: ./IPMICFG-Linux.x86_64 -dhcp [kcs] kcs_error: [kcs] kcs_error_exit: This is due to a missing kernel module that is required. On CentOS you can install the kernel module with the following (note that the package name may be […]