Slides
This page will hold slides from talks I have presented. This list is not complete. Tips on running a conference for 250 people all by yourself – EuroBSDCon 2012 – slides
Where is your tech passion?
You like tech. You know you like it. Do you know what part of tech you are most passionate about? I credit a Google employee for the following idea. It was told to me while I was at the FreeBSD Foundation booth at GHC 2016. The following is a relatively cheap project you can do in your spare time, weekends, and evenings. For the following tasks, blog about each step, in sufficient detail
Where is your tech passion? Read More »
ansible: Timeout waiting for privilege escalation prompt
I was doing some work in a remote location with a laggy connection to home. I was running ansible and kept encountering these errors: fatal: [pg01]: FAILED! => {“failed”: true, “msg”: “Timeout (12s) waiting for privilege escalation prompt: “} Rerunning the script would encounter the same error in a different part of the script. After an error-free run I concluded it was my dodgy connection; ansible was waiting for a reply from my
ansible: Timeout waiting for privilege escalation prompt Read More »
x8dtu
NOTE: this post has been replaced by a newer version. Please meet x8dtu, a server destined to be the future home of FreshPorts. There is nothing installed here. In short: FreeBSD 11 booting off a mirrored pair of zfsroot SSDs 4.5TB of mirrored ZFS 196612 MB of RAM (yeah, that’s 196GB of RAM) Supermicro X8TDU motherboard Intel Xeon E5620 @ 2.40GHz (two of those, giving 16 CPUs)
Server freeze – 2014.12.14
The knew server is ‘frozen’ again. This has been happening daily at about O301 UTC each night. See my Twitter feed for background. In this post I will include details as I progress through the data. The server in question is knew (yes, that’s the hostname). dtrace hotkernel I left this running in an ssh session and pressed control-C this morning: [root@knew:/usr/share/dtrace/toolkit] # ./hotkernel >> /var/tmp/hotkernel ^C ssh login loop It was suggested
Server freeze – 2014.12.14 Read More »
system freezes up with lots of sonewconn Listen queue overflow
I recently added 10 new HDD to a system which already had 10 HDD (now a total of 20). The HDD are split into two zpools: $ zpool list NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT system 27T 22.1T 4.93T – 19% 81% 1.00x ONLINE – tank_data 45.2T 26.3T 19.0T – 37% 58% 1.00x ONLINE – zoomzoom 436G 9.67G 426G – 6% 2% 1.00x ONLINE – The zoomzoom zpool is
system freezes up with lots of sonewconn Listen queue overflow Read More »
Flashing an LSI SAS 9201-16i – correctly
Three weeks ago, I thought I had flashed my new LSI SAS 9201-16i. I had not. When I powered up the system via mfsBSD, I could see the device, but during the boot process, there was no splash screen. I now believe this should always be a signal that you have not correctly flashed the card. Finally, I went back to basics. I went back to something I did in photos. I used
Flashing an LSI SAS 9201-16i – correctly Read More »
OSX was caching my ssh passphrases – easy fix
I have used ssh-agent for a long time. I enter my passphrase once, then let ssh-agent handle my ssh sessions. Last night, I noticed I ssh’d to a box and did not enter my passphrase. I got logged in. I had just rebooted my laptop so I was very concerned about this. It look at while, but eventually, I discovered the cause. OSX was caching the passphrase. More interestingly, it was not using
OSX was caching my ssh passphrases – easy fix Read More »
slocum
This post has been replaced by a newer one. For reference, the previous post on this server is still available. . This server recently moved to a rack-mount chassis. On an interim basis, it contains an LSI SAS 9101-16i. For future reference, this is the slocum server, which I use for various jails and services. The filesystems, well, some of them: And dmesg:
Flashing an LSI SAS 9201-16i
WARNING: This did not work. It succeeded, without error, but the card did not work. There will be a new blog post soon. Yesterday, a new LSI SAS 9201-16i arrived. I bought it on eBay from a supplier in China and paid for expedited shipping. I offered US$250 for their $338 listing and it was accepted. Shipping was another $30. It arrived 6 days later. Why do I need one? The system in
Flashing an LSI SAS 9201-16i Read More »