This is just an update of the Centralizing Logs post.
The solution is more mature and it's getting easier and easier to install all the components.
Elasticsearch Logstash and Kibana are now part of the ELK stack.

So here we go:
[cc lang='bash']
# java 7 required
## on debian 7
\$ apt-get install openjdk-7-jre-headless
## on debian 6 only java 6 is available, so we need to do a trick
\$ echo 'deb http://ppa.launchpad.net/webupd8team/java/ubuntu precise main' >> /etc/apt/sources.list
\$ apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
\$ apt-get update && apt-get install oracle-java7-installer -y

\$ wget -qO - http://packages.elasticsearch.org/GPG-KEY-elasticsearch | apt-key add -
\$ echo 'deb http://packages.elasticsearch.org/elasticsearch/1.3/debian stable main' >> /etc/apt/sources.list
\$ apt-get update && apt-get install elasticsearch
\$ update-rc.d elasticsearch defaults
\$ vi /etc/default/elasticsearch
\$ vi /etc/elasticsearch/elasticsearch.yml
\$ /etc/init.d/elasticsearch start

\$ echo 'deb http://packages.elasticsearch.org/logstash/1.4/debian stable main' >> /etc/apt/sources.list
\$ apt-get update && apt-get install logstash
\$ update-rc.d logstash defaults
\$ vi /etc/default/logstash
\$ vi /etc/logstash/conf.d/logstash.conf
\$ /etc/init.d/logstash start
[/cc]