Shell Tips ! » News http://www.shell-tips.com Some useful tips about CLI tools, Shell scripts and batch files... GNU Bash, Windows XP, SQL, Help Sheets / Cheat Sheets, etc. Mon, 14 Jun 2010 08:56:44 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 Bind 9.5.0 – Patch dlz MySQL 5 for auto reconnect http://www.shell-tips.com/2007/09/04/bind-950-patch-dlz-mysql-5-for-auto-reconnect/ http://www.shell-tips.com/2007/09/04/bind-950-patch-dlz-mysql-5-for-auto-reconnect/#comments Tue, 04 Sep 2007 21:50:17 +0000 Nicolas Brousse http://www.shell-tips.com/2007/09/04/bind-950-patch-dlz-mysql-5-for-auto-reconnect/ Here is a quick post of a “quick and dirty” patch for the ISC DNS Server : Bind 9.5.0a6 and its dlz mysql driver. For the quick story, I was using Bind 9.4.1 with dlz MySQL. My MySQL server is a 5.0.41 (with solidDB). While using it, I realize that some times the dns server was returning empty value for the dns queries. I tried many tips but it was still (sometime) giving me empty answer… Of course, I suspected the dlz driver. So, I tried to upgrade to Bind 9.5.0a6 but the problem still happened and the only way to fix was to restart bind !

So I take a look at the dlz driver and make this simple patch for adding the following features:

  • Set option MYSQL_OPT_RECONNECT to 1
  • Add some log error information while doing a ping

In fact, after using the few logs added thru mysql ping, I discover that when the driver lost its connection to the mysql server (due to a small wait_timeout, mysql restart, etc.) it tried to ping but didn’t succeed to reconnect to the server. Hopefully, I just needed to bypass the default option of MYSQL_OPT_RECONNECT while creating the connection.

MYSQL_OPT_RECONNECT

Enable or disable automatic reconnection to the server if the connection is found to have been lost. Reconnect has been off by default since MySQL 5.0.3; this option is new in 5.0.13 and provides a way to set reconnection behavior explicitly.

Now, I didn’t have to run a bloody crontab for checking that my dns server is still answering to its dns queries.

Enjoy. ;-)

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]]> http://www.shell-tips.com/2007/09/04/bind-950-patch-dlz-mysql-5-for-auto-reconnect/feed/ 3 Trac Plugins on Shell tips ! http://www.shell-tips.com/2007/01/02/trac-plugins-on-shell-tips/ http://www.shell-tips.com/2007/01/02/trac-plugins-on-shell-tips/#comments Tue, 02 Jan 2007 03:22:06 +0000 Nicolas Brousse http://www.shell-tips.com/2007/01/02/trac-plugins-on-shell-tips/ Good start for the new year, I’m learning Python and so add a new bunch of pages on shell-tips.com about some Trac plugins that I’m doing. Trac is a minimalistic web-based software project management and bug/issue tracking system. It provides an interface to the Subversion revision control systems, an integrated wiki, flexible issue tracking and convenient report facilities.

Two plugins are currently in the pipe :

  • A Platform Deployment Plugin for simplify web sources deployment on remote host
  • A Syslog-NG Plugin for having a nice interface for your web server syslog and so tracking the bugs

You can know more about those projects here.

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