Archive for the "sysadmin" Category

how to stop FTP brute-force attacks with DenyHosts

We use DenyHosts on several servers to keep the annoying kids in the neighborhood from banging on the ssh door all day. This has been working fine for years. But getting it working for FTP or other authenticated services was thought to be impossible by some. It isn’t impossible – but it is a little [...]

Blocked but not beaten

As of today, the local cable utility monopoly has decided to block outgoing port 25 in our neighborhood. Strange it took them this long – but it means sending email suddenly became a bit of a problem this morning, because we are in that “technically savvy” minority that owns their own off-site mail server. I [...]

bringing backgroundrb out of the dark ages

Due to voracious memory consumption issues that were bringing down the server, I had to upgrade the backgroundrb plugin inside a certain Rails app from version 0.2.1 (from Nov 06) to the latest svn trunk, which uses fork() and exec() properly, and seems to be a near-total rewrite. There were a lot of changes needed. [...]

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A service of Onset Corps LLC, and your humble author and fellow journeyer Samuel Beam.

Wherein, we specialize in over-involved explanations of all types, especially as concerning the efficacious use of tools and processes to maintain simplicity in an irreducibly complex world.

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