Author Archives: john

apache as reverse proxy under SLES

Posted on August 13, 2019 by john | 4 views

IntroJust got my SLES 12 SP4 server. That’s a type of commercial Linux I needed to set up a secure reverse proxy in a hurry. There’s a lot of suggestions out there. I share what worked for me. The version … Continue reading →

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Solution to NPR puzzle using Raspberry Pi

Posted on August 11, 2019 by john | 3 views

Intro Take a common five-letter word. If you add an “e” to the end you’ll get a common six-letter word. or add an ‘e” after the second letter to get a different six-letter word, or an “e” after the fourth … Continue reading →

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Raspberry Pi photo frame using your pictures on your Google Drive

Posted on August 6, 2019 by john | 5 views

Intro All my spouse’s digital photo frames are either broken or nearly broken – probably she got them from garage sales. Regardless, they spend 99% of the the time black. Now, since I had bought that Raspberry Pi PiDisplay awhile … Continue reading →

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F5 Big-IP: When your virtual server does not present your chain certificate

Posted on July 9, 2019 by john | 13 views

Intro While I was on vacation someone replaced a certificate which had expired on the F5 Big-IP load balancer. Maybe they were not quite as careful as I would like to hope I would have been. In any case, shortly … Continue reading →

Posted in IT Operational Excellence, Network Technologies, Web Site Technologies | Leave a comment

Can you go from Terminal 1 to Terminal 2 in O’Hare without going through the security lines again?

Posted on June 24, 2019 by john | 8 views

Yes. Yes, at least if you walk. Not sure about other transportation options. Count on about 13 minutes for the walk. Not sure why this information is so hard to find… Sometimes you land at one terminal and have to … Continue reading →

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How to test if a web site requires a client certificate

Posted on June 20, 2019 by john | 50 views

Intro I can not find a link on the Internet for this, yet I think some admins would appreciate a relatively simple test to know is this a web site which requires a client certificate to work? The errors generated … Continue reading →

Posted in Admin, Linux, Network Technologies, Raspberry Pi, Security, Web Site Technologies | Tagged | Leave a comment

F5 clustering tips

Posted on May 1, 2019 by john | 46 views

Intro I was having trouble with one of my new F5 clusters. I thought I’d be clever and add two new F5’s to the existing cluster, and then remove the old members when everything looked good. But the device groups … Continue reading →

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Postfix Operational tips

Posted on April 3, 2019 by john | 29 views

Intro I’m trying out the system-supplied postfix on a SLES system. i had been using sendmail but there doesn’t seem to be any development on that software. Some commands I needed right away Well, right away I had thousands of … Continue reading →

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Live stream to YouTube from a Raspberry Pi + webcam or USB microphone

Posted on April 3, 2019 by john | 49 views

Intro I’ve been looking at this off and on for awhile now. I finally made a breakthrough this week and started to generate some decent live streams on my Youtube channel, after a lot of misfires. Note this is applicable … Continue reading →

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How to add private root CAs in SLES or Redhat

Posted on March 18, 2019 by john | 42 views

Intro From time-to-time I run my own PKI infrastructure, namely issuing my own certificates form my private root CA. I wanted this root CA to be recognized by Linux utilities running on Suse Linux (SLES), in particular, lftp, which I … Continue reading →

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