I am migrating the load balancer pools from one F5 load balancer to another. Along with that move is a change to the monitor used to control automated load balancer status – when the app is stopped we have a sequence in the stop function which drains and then offlines the application in the load…
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Mapping applications to VMs
I use XEN in RedHat linux (CentOS) for our QA environment. Within each XEN server I might have 20 – 30 servers. There are three XEN servers per QA environment, three QA environments. A constant problem is tracking where applications are installed within the VMs. I use puppet throughout the environments, including deployments of applications…
Continue Readingcombining pdf files into one
I scanned a book I wanted to read on the go (and that was not available as an electronic version). I used vuescan and an Epson V750 Pro scanner. It was tedious. Especially tedious because about halfway through the (windows) system crapped out and vuescan crashed and I lost the pdf creation, thus having to…
Continue Readingfinding the largest files within a directory
I was shown this maybe my second day on my first job with the title “System Admin”. It worked on Solaris 2.4, and has continued to be useful through AIX, HPUNIX, Red Hat, Ubuntu, Debian, Gentoo, Crunchbang, other variants of Solaris, BSD, etc. One of the best parts of being a UNIX sysadmin instead of…
Continue Readingremoving older files with find
find . -mtime +7 -exec rm {} \; This finds and deletes files with a modified time exceeding 7 days… Every once in a while this becomes hugely necessary in pruning older logfiles, Since it has an “rm” command in it, I always look for the exact syntax and test. –doug
Continue Readingchecking inside rpms
Nine years ago I was trying to find which RPM contained the executable “cluconfig” for configuring clustering – I made these notes on looking for a file in rpms SUMMARY: needed cluconfig for Cluster Manager – searched for cluconfig in install disks for RHAS NOTES: mount the disk, cd to RPMS directory, run: for i…
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