To get statistics information about query numbers that Bind has served you need to add next line to configuration file: statistics-file “/var/stats/named.stats”; It should be added in a ‘global’ options statement. After that you need to restart Bind and run: rndc stats Bind will dump statistics to this file. Note that if you run Bind [...]
If you get next message Can’t locate object method “new” via package “LWP::UserAgent” at /usr/share/munin/plugins/nginx_request line 106. when you are installing nginx plugins for munin in Debian, this means that you don’t have perl LWP library. Installing it fixes an issue: apt-get install liblwp-useragent-determined-perl After munin-mode restart munin will start to create graphs.
Nagios is powerful monitoring software. And like OTRS in most cases it’s used with Apache. But sometimes you might want to use it with nginx. Here is a simple way to do that. Actually it’s very similar to launching OTRS with nginx – in both ways we use Perl FastCGI wrapper. I assume that you [...]
If you get a message ‘Warning: Can’t synchronize with repository “(default)” (Unsupported version control system “svn”: No module named svn). Look in the Trac log for more information’ while setting up or migrating you Trac, it means that you don’t have SVN library for Python installed. Note that Trac uses subversion-python package and not pysvn. [...]
Installing OTRS on Fedora is quite easy considering it has pre-built RPM packages and clean documentation. Usually OTRS is used with Apache. It’s stable well-tested solution. But what to do if you have nginx and you don’t want to have Apache? An issue becomes more complicated considering that nginx doesn’t support CGI from a box, [...]
In most case simple master-slave replication provides enough level of high-avalability (about 99.9%), read ops balancing and allows non-blocking backups (if you use MyISAM tables since InnoDB tables can be backed up without blocking). But sometimes you may want to setup chained replication with two slaves: first slave replicates from the master, and the second [...]
Usually to set up MySQL replication it’s convenient to dump database from current master with –master-data parameter. With this option mysqldump includes commented SQL operator which needs to be issued on slave to set up replication: CHANGE MASTER TO MASTER_LOG_FILE=’mysqld-bin.000008′, MASTER_LOG_POS=687808977; But sometime it’s not very good idea to dump database from master server. For [...]
Lua is a tiny but powerful programming language. Due to its small memory footprint (about hundreds of kilobytes) it’s widely used in application which need to be extended with more complex logic. For instance, Salvatore Sanfilippo has published a post describing how you can use power of Lua with Redis. It also applied to nginx, [...]
Ruby has gem, Python has pip and Lua has luarocks. Unfortunately, in Fedora 15 there is no rpm package of luarocks, so if you need it and don’t want to install it from sources, you will have to build it. Fortunately, there is a spec file written by Duboucher Thomas, so we don’t need to [...]
Here is a simple way to check if your database on master and slave server have the same data. We will use mk-table-checksum from maatkit tools for this purpose. Note! Never do it on the production server! Or use it on your own risk! As stated: mk-table-checksum executes queries that cause the MySQL server to [...]
