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During one of my regular trips to reddit, I stumbled upon an amazingly helpful Linux I/O stack diagram: It’s quite comprehensive and it can really help if you’re digging through a bottleneck and you’re not quite sure where to look. The original diagram is available in multiple formats from Thomas Krenn’s website. If you combine that with this slide from Brendan Gregg’s Linux Performance Analysis a

Working with ansible is enjoyable, but it’s a little bland when you use it with Jenkins. Jenkins doesn’t spawn a TTY and that causes ansible to skip over the code that outputs status lines with colors. The fix is relatively straightforward. First, install the AnsiColor Plugin on your Jenkins node. Once that’s done, edit your Jenkins job so that you export ANSIBLE_FORCE_COLOR=true before running an

My work at Rackspace has involved working with a bunch of Debian chroots lately. One problem I had was that daemons tried to start in the chroot as soon as I installed them. That created errors and made my ansible output look terrible. If you’d like to prevent daemons from starting after installing a package, just toss a few lines into /usr/sbin/policy-rc.d: cat > /usr/sbin/policy-rc.d << EOF #!/b

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Sometimes servers just have the weirdest SSL problems ever. In some of these situations, the entropy has been drained. Entropy is the measure of the random numbers available from /dev/urandom, and if you run out, you can’t make SSL connections. To check the status of your server’s entropy, just run the following: If it returns anything less than 100-200, you have a problem. Try installing rng-tool

If you want to convert a MyISAM table to InnoDB, the process is fairly easy, but you can do something extra to speed things up. Before converting the table, adjust its order so that the primary key column is in order: This will pre-arrange the table so that it can be converted quickly without a lot of re-arranging required in MySQL. Then, simply change the table engine: If your table is large, the

28 August 2009·Updated: 26 April 2024·131 words·1 min· Running OS X 10.6.3? William Fennie found a fix on Google Groups. First off, credit for this fix on OS X 10.6.2 goes to Geoff Watts from his two tweets. If you’re using Snow Leopard, you’ll find that the current version of MacFusion refuses to complete a connection to a remote server. You can fix this in two steps: First, quit MacFusion. Secon