I recently started cycling and with the North Texas summer heat decided that I need something more than just water to help me keep hydrated during the summer. I started by taking nuun tablets and it’s very good but after… Continue Reading
grub2 is vastly different from grub. Will post some tips and tricks.. list the current kernels on the OS # egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \’ Linux Server, with Linux 3.10.0-123.el7.x86_64 Linux Server, with Linux 3.10.0-123.4.4.el7.x86_64 Linux… Continue Reading
Before getting started please read my previous post for RHEL/CentOS 6.x systems here. grub2 is vastly different than grub and I did not find any good solution of doing this on a live machine so lets get started. The setup… Continue Reading
It seems that there are still many machines out in the world today that have a need for software raid to protect its data. Recently I’ve been working on some POS machines which can house 2 drives but does not… Continue Reading
Once in a while you will need to install a system thats not on the network and instead of manually installing it you want it automated with a kickstart file. For most hosts you can create a floppy image with… Continue Reading
Today while monitoring traffic on my server I noticed that there was 1 IP from UK that is keep accessing my server and generating noticeable amount of traffic. I did a quick IP lookup and netstat to find that the… Continue Reading
After the OS is installed and prepped there are some cleanup steps needed before turning it into a template. Remove old kernels Remove yum cache Clean out log files Remove device persistencies Clean up MAC and UUID Clean up history… Continue Reading
Register and auto subscribe in one step # subscription-manger register –username –password –auth-attach Register first then attach a subscription in the customer portal # subscription-manger register Attach a subscription from any available that match the system # subscription-manager attach –auth… Continue Reading
Image formats RAW – Unstructured disk image format. QCOW2 – Disk format supported by QEMU emulator. ISO – Sector-by-sector copy of the data on a disk, stored in a binary file. AKI – Indicates an Amazon Kernel Image. AMI –… Continue Reading
simple sort to show which application is using the most memory. ps -elf | awk ‘{print $10, $3, $4, $15, $16}’| sort -nr | head 572923 mysql 1246 /usr/libexec/mysqld –basedir=/usr 257775 root 6260 /usr/bin/python /usr/bin/fail2ban-server 176636 clamav 1086 clamd 146010… Continue Reading