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Further Host Problems...
- To: email@example.com
- Subject: Further Host Problems...
- From: Nanook <firstname.lastname@example.org>
- Date: Sat, 19 Oct 2002 13:13:14 -0700 (PDT)
- Resent-date: Sat, 19 Oct 2002 13:13:18 -0700
- Resent-from: email@example.com
- Resent-message-id: <"RlKCr1.0.1C3.UpRiz"@mx1>
- Resent-sender: firstname.lastname@example.org
Last night we had to do an emergency kernel upgrade because root exploits were discovered (and announced on an IRC list repleat with hackers) in the Linux kernel. Some of the defaults, particularly the number of processes per user, were not adequate for the proper operation of our main webserver. This didn't cause any apparent problems at the time because traffic was low, but this morning when traffic picked up the web server became starved for resources and web requests randomly failed. I have built a new kernel with values that provide adequate resources and everything should be back to "normal" now. It did require several reboots, which didn't go cleanly and that interrupted other services for a short time this morning.