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113 lines
3.3 KiB
Markdown
113 lines
3.3 KiB
Markdown
# Setting up RRDCached
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This document will explain how to setup RRDCached for LibreNMS.
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> If you are using rrdtool / rrdcached version 1.5 or above then this now supports creating rrd files over rrdcached. To
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enable this set the following config:
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```php
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$config['rrdtool_version'] = 1.5;
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```
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### RRDCached installation CentOS 6
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This example is based on a fresh LibreNMS install, on a minimimal CentOS 6 installation.
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In this example, we'll use the Repoforge repository.
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```ssh
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rpm -ivh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
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vi /etc/yum.repos.d/rpmforge.repo
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```
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- Enable the Extra repo
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```ssh
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yum update rrdtool
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vi /etc/yum.repos.d/rpmforge.repo
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```
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- Disable the [rpmforge] and [rpmforge-extras] repos again
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```ssh
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vi /etc/sysconfig/rrdcached
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# Settings for rrdcached
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OPTIONS="-w 1800 -z 1800 -f 3600 -s librenms -j /var/tmp -l unix:/var/run/rrdcached/rrdcached.sock -t 4 -F -b /opt/librenms/rrd/"
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RRDC_USER=librenms
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mkdir /var/run/rrdcached
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chown librenms:librenms /var/run/rrdcached/
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chown librenms:librenms /var/rrdtool/
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chown librenms:librenms /var/rrdtool/rrdcached/
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chkconfig rrdcached on
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service rrdcached start
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```
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- Edit /opt/librenms/config.php to include:
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```php
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$config['rrdcached'] = "unix:/var/run/rrdcached/rrdcached.sock";
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```
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### RRDCached installation CentOS 7
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This example is based on a fresh LibreNMS install, on a minimimal CentOS 7.x installation.
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We'll use the epel-release and setup a RRDCached as a service.
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It is recommended that you monitor your LibreNMS server with LibreNMS so you can view the disk I/O usage delta.
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See [Installation (RHEL CentOS)][1] for localhost monitoring.
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- Install the EPEL and update the repos and RRDtool.
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```ssh
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yum install epel-release
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yum update
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yum update rrdtool
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```
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- Create the needed directories, set ownership and permissions.
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```ssh
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mkdir /var/run/rrdcached
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chown librenms:librenms /var/run/rrdcached
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chmod 755 /var/run/rrdcached
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```
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- Create an rrdcached service for easy daemon management.
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```ssh
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touch /etc/systemd/system/rrdcached.service
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```
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- Edit rrdcached.service and paste the example config:
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```ssh
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[Unit]
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Description=RRDtool Cache
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After=network.service
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[Service]
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Type=forking
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PIDFile=/run/rrdcached.pid
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ExecStart=/usr/bin/rrdcached -w 1800 -z 1800 -f 3600 -s librenms -j /var/tmp -l unix:/var/run/rrdcached/rrdcached.sock -t 4 -F -b /opt/librenms/rrd/
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RRDC_USER=librenms
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[Install]
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WantedBy=default.target
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```
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- Restart the systemctl daemon so it can recognize the newly created rrdcached.service. Enable the rrdcached.service on boot, and start the service.
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```ssh
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systemctl daemon-reload
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systemctl enable rrdcached.service
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systemctl start rrdcached.service
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```
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- Edit /opt/librenms/config.php to include:
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```ssh
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$config['rrdcached'] = "unix:/var/run/rrdcached/rrdcached.sock";
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```
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- Restart Apache
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```ssh
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systemctl restart httpd
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```
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Check to see if the graphs are being drawn in LibreNMS. This might take a few minutes.
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After at least one poll cycle (5 mins), check the LibreNMS disk I/O performance delta.
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Disk I/O can be found under the menu Devices>All Devices>[localhost hostname]>Health>Disk I/O.
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Depending on many factors, you should see the Ops/sec drop by ~30-40%.
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[1]: http://librenms.readthedocs.org/Installation/Installation-(RHEL-CentOS)/#add-localhost
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"Add localhost to LibreNMS"
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