## Install to CentOS (optional)

Install to CentOS (optional) — How to install milter manager related softwares to CentOS

## About this document

This document describes how to install milter manager related softwares to CentOS. See Install to CentOS for milter manager install information and Install for general install information.

## Install milter-manager-log-analyzer

milter-manager-log-analyzer is already installed because it is included in milter manager's RPM package. We will configure Web server to browse graphs generated by milter-manager-log-analyzer.

There are two ways to view generated graphs; (1) view them via a Web server at the same host and (2) view them via Munin (and a Web server) at other host. If we already have Munin or exclusive system monitoring server, Munin is a better way. Otherwise, a Web server at the same host is a better way. [5]

First, a way that a Web server in the same host will be explained, then a way that using Munin will be explained.

### Way 1: View via a Web server at the same host

#### Install packages

We use Apache as Web server.

    % sudo yum install -y httpd
    % sudo /sbin/chkconfig httpd on

#### Configure milter-manager-log-analyzer

milter-manager-log-analyzer generates graphs to milter-manager user's home directory. (/var/lib/milter-manager/) We configure Web server to publish them at http://localhost/milter-manager-log/.

We put /etc/httpd/conf.d/milter-manager-log.conf with the following content:

    Alias /milter-manager-log/ /var/lib/milter-manager/public_html/log/

We need to reload configuration after editing:

    % sudo /sbin/service httpd reload

Now, we can see graphs at http://localhost/milter-manager-log/.

### Way 2: View via Munin at other host

Next way is using Munin at other host.

#### Install packages

We install milter-manager-munin-plugins package that provides statistics data collected by milter-manager-log-analyzer to Munin:

    % sudo yum install -y milter-manager-munin-plugins

NOTE: We need to use databases created by milter-manager-log-analyzer bundled with milter manager 1.5.0 or later to provide statistics data to Munin. If we have databases that are created by older milter-manager-log-analyzer, we need to remove ~milter-manager/public_html/log/. If we remove the directory, milter-manager-log-analyzer re-creates statistics databases 5 minutes later.

#### Configure munin-node

Munin-node should accept accesses from Munin server. If Munin server is 192.168.1.254, we need to append the following lines to /etc/munin/munin-node.conf:

/etc/munin/munin-node.conf:

    allow ^192\.168\.1\.254$

We need to restart munin-node to apply our configuration:

    % sudo /sbin/service munin-node restart

#### Configure Munin server

Works in this section at system monitor server. We assume that system monitor server works on CentOS.

First, we install munin and Apache:

    monitoring-server% sudo yum install -y munin httpd

We add our mail server that works munin-node to munin's monitor target. We assume that mail server has the following configuration:

Host name | mail.example.com
IP address | 192.168.1.2

We need to add the following lines to /etc/munin/munin.conf to add the mail server:

/etc/munin/munin.conf:

    [mail.example.com]
        address 192.168.1.2
        use_node_name yes

We will be able to view graphs at http://monitoring-server/munin/ 5 minutes later.

## Conclusion

We can confirm milter's effect visually by milter-manager-log-analyzer. If we use Postfix as MTA, we can compare with Mailgraph 's graphs to confirm milter's effect. We can use graphs generated by milter-manager-log-analyzer effectively when we are trying out a milter.

[5] If we want to run Munin at the same host, we need a Web server.