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Hi. I'm a Unix Administrator, mathematics enthusiast, and amateur philosopher. This is where I rant about that which upsets me, laugh about that which amuses me, and jabber about that which holds my interest most: Unix.
Old

RIP: bad value: NULL

Posted 09-18-2013 at 09:57 PM by rocket357 (Musings on technology, philosophy, and life in the corporate world)

Spent a few days debugging what I thought was a bizarre kernel bug on a RHEL 6.3 box. We had crash utilities installed and I'd gotten incredibly comfortable with analyzing kernel crash dumps. I can also say that I'm intimately familiar with a few features of the Linux kernel that I didn't even know existed before.

If you know much about kernel debugging, you probably already know the fix (due to the subject line). See, when you analyze a kernel crash dump, you get certain information,...
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Views 595 Comments 0 rocket357 is offline
Old

tor as an...availability service?

Posted 07-24-2013 at 07:26 PM by rocket357 (Musings on technology, philosophy, and life in the corporate world)

Last night my wife complained to me that facebook was taking forever to load. I figured it was just a hiccup somewhere between facebook and our home network, so I waited a bit to see.

An hour or so later, she was getting impatient, so I fired up a tcpdump session on the firewall and watched her desktop exchange a pretty funny set of packets (well, you had to be there, I suppose), loaded with PUSH, URG, and FIN packets back and forth between her desktop and facebook. I laughed and...
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Views 1505 Comments 1 rocket357 is offline
Old

pcap_open_live(vlan2): vlan2: (all BPF devices are busy)

Posted 06-25-2013 at 03:42 PM by rocket357 (Musings on technology, philosophy, and life in the corporate world)

I can haz iftop x 5?

No, apparently not.

Code:
# lsof | grep bpf                                                       
iftop      1106    _iftop    4u    VCHR       23,5        0t0   58522 /dev/bpf5
dhclient  10196      root    5u    VCHR       23,9 0t15376716   58526 /dev/bpf9
iftop     10521    _iftop    4u    VCHR       23,8 0t30713975   58525 /dev/bpf8
dhclient  10789     _dhcp    5u    VCHR       23,9 0t15376716   58526 /dev/bpf9
...
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Views 544 Comments 0 rocket357 is offline
Old

/30 ftw!

Posted 06-16-2013 at 09:31 PM by rocket357 (Musings on technology, philosophy, and life in the corporate world)

So, one of my big fears on my home network is a virus outbreak. Granted, my wife is an incredibly paranoid web surfer, and in the 12 years we've been together there has been just one virus issue (and that was after our niece used her computer to surf some "ooh, I'm a vampire...I sparkle!" type of social sites). Sigh.

So, why the rekindled fear? My daughter is old enough to start using the internet, and she hasn't had time to build up the same paranoia that her mother...
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Views 1585 Comments 1 rocket357 is offline
Old

From zero to Ventrilo in 5 minutes...

Posted 06-05-2013 at 10:30 PM by rocket357 (Musings on technology, philosophy, and life in the corporate world)
Updated 06-06-2013 at 12:18 AM by rocket357

Long story short:

Me. Rackspace cloud. Start timer.

Spin up Ubuntu 13.04 cloud server (512 MB size is perfect for this), start downloading Ventrilo Server for Linux. Edit Cloud DNS in the Rackspace mycloud portal to add A/CNAME/PTR after the assigned ip's show up...

A few moments later, login to server. Change root password. scp Ventrilo installer to server. Install the Rackspace cloud monitoring agent.

Create vent user. Untar...
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Views 1726 Comments 1 rocket357 is offline

  



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