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Category: Linux

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CentOS 7 to Alma Linux 8 on linode

I recently ran into an issue converting a system from CentOS 7 to Alma Linux 8 on a Linode VM I’ve had for almost seven years. I couldn’t even get Continue Reading…

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Speeding up long-distance vMotion

Here’s the situation I was facing. Two Vmware vCenter 7.0.3. clusters on opposite sides of the country, connected via a a 10gig point to point ethernet circuit, and that circuit Continue Reading…

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IPIP tunneling in Linux (Ubuntu)

I think the increasingly low use of IPIP, i.e. IP-in-IP or IP-IP, tunneling these past few decades has resulted in very little documentation on how to set it up on Continue Reading…

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Blocking (multiple) user agents with nginx

Got some script kiddie bots annoying you, but they’re using long legit-looking user agents you can’t easily pattern match on without catching legit visitors? Try this:

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Accessing pfSense-based CRL remotely

I have an OpenVPN instance operating on a pfSense firewall virtual machine. Within OpenVPN I’m using both radius-based two factor for authentication, and certificate-based auth in the client. Doing this Continue Reading…

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Raspberry Pi Serial Controller to Pentair Pool

I recently had a power surge come through my Pentair IntelliTouch-based pool control system, destroying its control board, and unfortunately destroying the control module of my home automation system on Continue Reading…

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Extracting the CA certificate from an Active Directory server

Need to get the CA certificate out of an Active Directory server for use with other systems?  I had this need when trying to connect Atlassian Jira to an internal Continue Reading…

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Display details of HSM-protected RSA keys

Recently had a need to demonstrate for an auditor that a given key encryption key in a Thales HSM environment was RSA and was 4096-bits.  The correct command to do Continue Reading…

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Replacing a failed Thales nShield Connect HSM

Recently had a Thales nShield Connect 6000 fail.  Replacing them is fairly easy, but there are a large number of steps, so figured I’d write them out here in case Continue Reading…

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Finding ‘unprintable’ characters in a file with vi

Recently had an issue where a series of XML files were refusing to import into a program due to invalid characters; invalid from the importing software’s perspective.  I needed to Continue Reading…

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