A detail-minded individual, combining strong technical understanding and communication skills with experiences in Systems administration; a proven methodical problem solver.


How to setup SMTP port redirect with IPTABLES and NAT

RedHat/Centos Okay its really easy to do. You will need to add the following in /etc/sysctl.conf Note: these are kernel parameter changes 1.vi /etc/sysctl.conf add the following lines kernel.sysrq = 1 net.ipv4.tcp_syncookies=1 net/ipv4/ip_forward=1 (important) net.ipv4.conf.all.route_localnet=1 (important) net.ipv4.conf.default.send_redirects = 0 net.ipv4.conf.all.send_redirects = 0 . 2.Save the file and run • Sysctl -p (this will load the new kernel parameters) 3.Now you ifRead the Rest…


How to rebuild a drive that’s fallen out of a software raid

Now I know nobody uses this kind of raid technology anymore, but it was one of the cool things I learned from my mentor at the time, when I first started my career centuries ago. I happen to find this in my archives and thought I would write up to share. There is another way to do this as usingRead the Rest…


How to add a new SCSI LUN while server is Live

REDHAT/CENTOS: In order to get wwn ids from a server: • cat /sys/class/scsi_host/host0/device/fc_host\:host0/port_name • cat /sys/class/scsi_host/host1/device/fc_host\:host1/port_name Or: • systool -av -cfc_host | grep port_name | awk ‘{ print $3 }’ | cut -d\” -f 2 | cut -dx -f 2 . 1.To add a new SAN LUN while live: Run this to find the new disks after you have added them to yourRead the Rest…


How to figure out switch and port via tcpdump

Okay if you have ever worked in a place where their network was complete choas with no documentation or network maps to help you figure out where something resides. You can sometimes use tcpdump to help you figure out where the server is sitting by using tcpdump. Syntax tcpdump -nn -v -i <NIC_INTERFACE> -s 1500 -c 1 ‘ether[20:2] == 0x2000’Read the Rest…


How to increase disk size on virtual scsi drive using gpart

1.Login to VMware vSphere Client and shutdown server VM guest. 2.Select VM Guest server and click “Edit virtual machine settings”. Virtual Machine Properties window will appear. Under “Hardware”, click Hard Disk 2 (which is /data partition) and edit provision size to 200 GB as shown in below screenshot. Power ON VM guest after editing disk size. 3.Take VM snapshot ofRead the Rest…


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