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This is a short article that explains how you change the default MySQL data directory and adjust SELinux to account for the changes. The article assumes that you’re running either RHEL, CentOS, Scientific Linux or Fedora with SELinux enabled. This works with the most recent EL (6.2) version. We’ll be doing this in the following […] Security through obscurity is not something one would generally recommend. But to thwart the effort of automated scanners changing the default OpenSSH port will yield you less pain in every day life. This will not fend off directed attacks or nullify vulnerabilities or bad security design. Should you see an error message such as shd[14221]: […] An access control list (ACL), with respect to a computer file system, is a list of permissions attached to an object. ACL allows you to grant or deny permissions for any user or group on a filesystem resource. Enabling ACL To enable ACL, edit your /etc/fstab file as such: /dev/VolGroup00/LogVol00 / ext3 defaults,acl 1 1 […] There’s several ways of accomplishing this. I will list all the methods beneath, just pick the one that fits the situation/you. Filesystem tunable Grub boot parameter Placing command files on your root device Active reboot without FSCK Filesystem tunable Use the tune2fs command to tell your filesystem to have a max count of mounts before […] This will be a quick howto on how you would set up a 2-node GlusterFS filesystem. You may look up more information at http://www.gluster.org/. Volume types for GlusterFS – Distributed. Distributed volumes distributes files throughout the bricks in the volume – Replicated. Replicated volumes replicates files across bricks in the volume – Striped. Striped volumes […] Tonight when upgrading a CentOS Linux server it was noted by YUM that 15MB more disk space was needed to upgrade grub and the kernel itself. Below are four quick steps to verify what kernels are installed, install yum-utils if it is not installed already, delete previous kernels and set YUM to remove old kernels […] we talked about how the memory on a Linux guest is used for the OS itself (the kernel, buffers, etc.), applications, and also for file cache. File caching is an important performance improvement, and read caching is a clear win in most cases, balanced against applications using the RAM directly. Write caching is trickier. The […] High i/o wait tuning for File Servers Under “Server”?“General” tab, change “Priority” configuration to “-19”. Process priority can be set from -19 to 20, -19 is the highest, 20 is the lowest. Change to ‘deadline’ I/O scheduler From command line (change the device ‘sda’ to appropriate device): echo “deadline” > /sys/block/sda/queue/scheduler kernel parameter, change /boot/grub/menu.lst, […] Releasing cached memory in Linux Under normal circumstances, modern Linux systems try to cache into memory disk data that is accessed often. Sometimes, we have that much memory in the system that our kernel keeps filling up the memory by caching every piece of data we access. Other times, because of the swappiness factor, active […] CentOS 6.5 Install Problem// // // CentOS 6.5 Install Problem I have recently installed CentOS 6.5 on a couple of computers, once without any problems and once with a fatal hang during install. With both installs I chose to overwrite any existing partitions and use the whole hard-drive.The problem during the failed install […] |
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