Posted inmaildir postfix

Postfix, Maildir Replication In Real Time Using ChironFS

In this tutorial I will describe how to set up postfix and maildir which can automatically replicate email when email is delivered. We will not touch the postfix configuration at all. we will manipulate maildir directory behavior using ChironFS, instead.

what is ChironFS?

This the Chiron Filesystem. It is a Fuse based filesystem. It’s main purpose is to guarantee filesystem availability using replication. But it isn’t a RAID implementation. RAID replicates DEVICES not FILESYSTEMS.

Things we need before installing chironfs

  • fuse
  • fuse-devel
  • fuse-libs
  • ChironFS source/binary from here

Compile ChironFS source

RPM:

$ rpmbuild --rebuild chironfs-1.0.0-1.fc8.src.rpm
$ rpm -ivh /path/to/chironfs-1.0.0-1.fc12.rpm
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Posted inmemcache

Memcached Replication On Server Clusters

When I was looking for ways to replicate the contents of memcached for high-availability performance, I found this memcached-repcached application. that has the ability to replicate the contents of one memcached to another.

Repcached key features

  • Multi master replication.
  • Asynchronous data repliacation.
  • Support all memcached command (set, add, delete, incr/decr, flush_all, cas)

People probably already know about memcached . It’s a robust, high performance key-value based memory object cache interface. but unfortunately, lack the ability to create redundancy and replication in memcached server clusters. although replication could be done at the application level. However, it all depends on each individual’s taste.

This is a quick and dirty experiment I have tried using memcached-repcached application on 2 servers.

Download memcached-repcached from repcached.lab.klab.org
Or you can download source rpm version from here
[download#33]

On the first server and second server extract memcached-1.2.8-repcached-2.2.tar.gz, compile with –enable-replication option when configure.

$ tar xvzf memcached-1.2.8-repcached-2.2.tar.gz
$ cd memcached-1.2.8-repcached-2.2
$ ./configure --enable-replication
$ make
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