Archive for Linux category:
2010 will be a bad year for ipv4
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We are now at the end of January, but IPv4, the Internet’s core addressing protocol still has a nasty hangover, and all signs are pointing to 2010 being a bad year for the protocol.
Since January 1st, a few key milestones have passed, indicating how urgent the IPv4 rundown problem has become. Firms that rely on [...]
innodb_data_file_path bug with long line limits
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I have a MySQL server which was starting to scrunch its data more and more slowly. Some analysis led me to blame an autoextending innodb file which had grown somewhat unkept to several GB. I wish the autoextend behaviour could be configured to grow more files rather than grow one file, but that’s another rant. [...]
Extreme Switch / OpenSSH bug
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I have been trying to get a patch applied to Debian’s openssh-client packages since February which would fix a bug that prevents me from logging into Extreme switches via ssh:
trials:/usr/src/openssh-5.1p1# ssh hextreeme -l netadmin
Keyboard-interactive authentication
Enter password for netadmin:
channel 0: open failed: resource shortage: Channel open failed
The bug is described in Debian bug 495917, and it [...]
Mac VNC Client for Linux KVM
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When you build a KVM guest, if you want to install the guest over the network, you should attach the video console of your guest to a VNC display.
How can I put this..? This is quite a novel way of doing it. I think there’s a reason that more virtualisation systems don’t work in this [...]
Making Round Robin DNS usable.
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I have been fairly consistently telling people a lie for the last ten years – and that is that Round Robin DNS can not be used for high availability. Its a view I have held pretty strongly, but two people have shown me techniques in the last week that have made me change my [...]
Making Parallels less of a CPU Hog when Idle.
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Clever Dave likes Parallels for development, but doesn’t like that it is a cpu hog. An idle vm swallowed up 40-50% of cpu on his new Macbook.
He had the idea that reducing the speed of the kernel clock to 100MHz might make the idle vm less resource hungry, so we tested it out. Changing [...]
Scalability – a talk at LugRadio Live 2007
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I’m at LRL (currently watching Ted Haeger’s talk), and I am publishing my notes for my talk tomorrow, “Scaling Up for Champions”.
There are quite a lot of config examples in the notes which aren’t on the slides to support the talk.
Overview:
Definition of Scaling & Problems of scaling
You have to monitor things
Scaling individual machines – Disk [...]
Trend Monitoring Suites
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I hate cacti. Sorry guys, there are lots of things that are good about it, and those things are that if you want to monitor just switch/router interface stats, via snmp, and that’s *it*, its very easy. When you want to plot technical data that you source through something other than snmp, working [...]
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