{{tag>Brouillon}}

= Install de Munin sur RedHat /CentOS

Source : http://tecadmin.net/installing-munin-in-centos-rhel-and-fedora/

Install
<code bash>
yum install epel-release
yum --enablerepo=epel install munin munin-node rrdtool
</code>

Changement binding sur localhost (inutile d'écouter sur les cartes réseaux, car on communique en localhost)
<code bash>
sed -i -e 's/^host \*/host 127.0.0.1/' /etc/munin/munin-node.conf
</code> 

Création MDP
<code bash>
htpasswd -cm /etc/munin/munin-htpasswd muninadmin
</code>

Nous ajoutons dans le fichier /etc/httpd/conf.d/munin.conf la ligne suivante :

''/etc/httpd/conf.d/munin.conf''
<code apache>
Alias /munin /var/www/html/munin
</code>

Sur ma conf j'ai dû aussi ajouter un ''DirectoryIndex index.html''

Normalement ça devrait ressembler à :

''/etc/httpd/conf.d/munin.conf''
<code apache>
# This file can be used as a .htaccess file, or a part of your apache
# config file.
#
# For the .htaccess file option to work the munin www directory
# (/var/www/html/munin) must have "AllowOverride all" or something close
# to that set.
#
# As a config file enclose it in <directory> like so:
#
<directory /var/www/html/munin>

AuthUserFile /etc/munin/munin-htpasswd
AuthName "Munin"
AuthType Basic
require valid-user

# This next part requires mod_expires to be enabled.
#
# We could use <IfModule mod_expires> around here, but I want it to be
# as evident as possible that you either have to load mod_expires _or_
# you coment out/remove these lines.

# Set the default expiery time for files 5 minutes 10 seconds from
# their creation (modification) time.  There are probably new files by
# that time.

ExpiresActive On
ExpiresDefault M310
# Ajout
DirectoryIndex index.html

</directory>
ScriptAlias /munin-cgi/munin-cgi-graph /var/www/cgi-bin/munin-cgi-graph
<Location /munin-cgi/munin-cgi-graph>
  AuthUserFile /etc/munin/munin-htpasswd
  AuthName "Munin"
  AuthType Basic
  require valid-user
</Location>

# Ajout
Alias /munin /var/www/html/munin
</code>



<code bash>
systemctl enable munin-node
systemctl start munin-node
</code>


En vérifie que la conf est ok
<code bash>
apachectl -t
</code>

Si ok
<code bash>
systemctl reload httpd
</code>

NB, les graphes sont générés grâce à la cron ''/etc/cron.d/munin''


== Notes brouillon

CentOS6


=== MySQL

<code bash>
ln -s /usr/share/munin/plugins/mysql_* /etc/munin/plugins/
service munin-node restart
</code>

''/etc/munin/plugin-conf.d/munin-node''
<code ->
[diskstats]
user munin

[iostat_ios]
user munin

[mysql*]
user root
env.mysqlopts --defaults-extra-file=/var/lib/munin/.my.cnf
</code>

''/var/lib/munin/.my.cnf''
<code ini>
[mysqldump]
user=root
password=P@ssw0rd

[mysql]
user=root
password=P@ssw0rd

[mysqladmin]
user=root
password=P@ssw0rd

[mysqlshow]
user=root
password=P@ssw0rd
</code>

<code bash>
chown munin:munin /var/lib/munin/.my.cnf
chmod 600 /var/lib/munin/.my.cnf
service munin-node restart
</code>


=== Apache

''/etc/httpd/conf/httpd.conf''
<code apache>
LoadModule status_module modules/mod_status.so

ExtendedStatus On

<Location /server-status>
    SetHandler server-status
    Order deny,allow
    Deny from all
    Allow from 127.0.0.1 ::1
</Location>
</code>

<code bash>
service httpd restart
</code>

<code bash>
ln -s /usr/share/munin/plugins/apache_* /etc/munin/plugins/
service munin-node restart
</code>


== Pb MySQL bug : mysql innodb free tablespace

Voir :
* https://forums.cpanel.net/threads/munin-plugin-warn-mysql-innodb-free-tablespace.208591/

Test
<code bash>
su - munin -s /bin/bash
cd /etc/munin/plugins
./mysql_innodb
</code>

Erreur
<code ->
./mysql_innodb: Error: No visible tables use InnoDB
free.value U
</code>

Désactiver la sonde
<code bash>
unlink /etc/munin/plugins/mysql_innodb
service munin-node restart
</code>