I’ve started using Nagios Checker plugin for Firefox, which puts a little Nagios status indicator into the bottom right corner of your Firefox status bar. A green “no problem” if there is no problem, or an alert indicator if there are issues. You don’t have to be in your Nagios window or look at it…
ulimit can be used to limit memory utilization (among other things) Here is an example of setting memory usage so low that /bin/ls (which is larger than /bin/cat) no longer works, but /bin/cat still works. $ ls -lh /bin/ls /bin/cat -rwxr-xr-x 1 root root 25K May 24 2008 /bin/cat -rwxr-xr-x 1 root root 88K May…
I wrote a shell script mash-up of “find” and “cp”, and here is the feedback that warmed this sys admin’s heart: I was looking for someone to quickly write a linux shell script involving recursive copies and regular expressions, taking into account both time and space complexity. After a few candidates thought they could do…
If you are in the L.A. area, please come and support LOPSA Los Angeles – join us for our monthly meeting at Chipotle Mexican Grill in El Segundo. When: Thursday, Dec. 4th, 9:00 PM – 10:00 PM (after UUASC-LA gets out) Where: Chipotle Mexican Grill, 307 N Sepulveda Blvd, El Segundo, CA 90245, (310) 426-1437…
Roger Kelley from Xiotech presented to UUASC last week on Xiotech’s next-gen storage technology. The basic ideas are: – Xiotech is a spin-off from Seagate and still maintains an R&D relationship with Seagate – The basic disk storage unit from Xiotech is a unit that holds two sealed-in datapacs, each of which holds 10 drives….
Here are my notes how I set up SVN over SSH to an SVN server that had been set up to run SVN as a single user, “svn”. So, we have multiple users on the remote side, all logging in as “svn” on the SVN server side. Authentication is done via a dedicated key-pair, with…
This is nifty – you can specify a remote tape drive, root@unix2:/dev/tape Example: unix1# tar -x -v –rsh-comand /usr/bin/ssh -f root@unix2:/dev/tape ./file1 ./file2 ./file3 … unix1#
TAR per frame means each TIFF file is written as a separate TAR file onto tape. This is a practice in the entertainment industry. Now, the default tape device (/dev/st0 on Linux) rewinds after each command. Trying to read consecutive files, and rewinding between each read, adds a lot of time. It’s possible to specify…
This just in: USENIX is pleased to announce open public access to all its conference proceedings. This significant decision will allow universal access to some of the most important technical research in advanced computing. In making this move USENIX is setting the standard for open access to information, an essential part of its mission. USENIX…
Here is a pair of ssh “for” loops to backup all the crontabs on my Linux and HP-UX systems to my admin host: for f in `cat ~/linux_hostnames.txt ` do echo backing up $f; ssh $f ‘sudo tar cvf – /var/spool/cron/’ > $f.tar done for f in `cat ~/hpux_hostnames.txt ` do echo backing up $f;…