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2015-06-09 17:34:00 +00:00
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Agent setup
-----------
To gather data from remote systems you can use LibreNMS in combination with check_mk (included in the librenms-agent repository).
The agent uses TCP-Port 6556, please allow access from the LibreNMS-Host and Poller-Nodes if you're using the Distributed Polling setup.
On each of the hosts you would like to use the agent on then you need to do the following:
* Copy the `check_mk_agent` script into `/usr/bin` and make it executable.
```shell
cp check_mk_agent /usr/bin/check_mk_agent
chmod +x /usr/bin/check_mk_agent
```
* Copy the xinetd config file into place.
```shell
cp check_mk_xinetd /etc/xinetd.d/check_mk
```
* Create the relevant directories.
```shell
mkdir -p /usr/lib/check_mk_agent/plugins /usr/lib/check_mk_agent/local
```
* Copy each of the scripts from `agent-local/` into `/usr/lib/check_mk_agent/local`
* And restart xinetd.
```shell
/etc/init.d/xinetd restart
```
* Login to the LibreNMS web interface and edit the device you want to monitor. Under the modules section, ensure that unix-agent is enabled.
* Then under Applications, enable the apps that you plan to monitor.
* Wait, in around 10 minutes you should start seeing data in your graphs under Apps for the device.
## Application Specific Configuration
### BIND9/named
Create stats file with appropriate permissions:
```shell
~$ touch /etc/bind/named.stats
~$ chown bind:bind /etc/bind/named.stats
```
Change `user:group` to the user and group that's running bind/named.
Bind/named configuration:
```text
options {
...
statistics-file "/etc/bind/named.stats";
zone-statistics yes;
...
};
```
Restart your bind9/named after changing the configuration.
Verify that everything works by executing `rndc stats && cat /etc/bind/named.stats`.
In case you get a `Permission Denied` error, make sure you chown'ed correctly.
Note: if you change the path you will need to change the path in `agent-local/bind`.
### TinyDNS/djbdns
__Installation__:
1. Get tinystats sources from http://www.morettoni.net/tinystats.en.html
2. Compile like as advised.
_Note_: In case you get `Makefile:9: *** missing separator. Stop.`, compile manually using:
* With IPv6: `gcc -Wall -O2 -fstack-protector -DWITH_IPV6 -o tinystats tinystats.c`
* Without IPv6: `gcc -Wall -O2 -fstack-protector -o tinystats tinystats.c`
3. Install into prefered path, like `/usr/bin/`.
__Configuration__:
_Note_: In this part we assume that you use DJB's [Daemontools](http://cr.yp.to/daemontools.html) to start/stop tinydns.
And that your tinydns-instance is located in `/service/dns`, adjust this path if necesary.
1. Replace your _log_'s `run` file, typically located in `/service/dns/log/run` with:
```
#!/bin/sh
exec setuidgid dnslog tinystats ./main/tinystats/ multilog t n3 s250000 ./main/
```
2. Create tinystats directory and chown:
`mkdir /service/dns/log/main/tinystats && chown dnslog:nofiles /service/dns/log/main/tinystats`
3. Restart TinyDNS and Daemontools: `/etc/init.d/svscan restart`
_Note_: Some say `svc -t /service/dns` is enough, on my install (Gentoo) it doesnt rehook the logging and I'm forced to restart it entirely.
### MySQL
Unlike most other scripts, the MySQL script requires a configuration file `/usr/lib/check_mk_agent/local/mysql.cnf` with following content:
```php
<?php
$mysql_user = 'root';
$mysql_pass = 'toor';
$mysql_host = 'localhost';
$mysql_port = 3306;
```
NOTE: This only applies to the PHP-Version of the Statistics-poller. There's work being done in porting this script to Python, a different configuration file (if any) will apply.
### Nginx
It's required to have the following directive in your nginx-configuration responsible for the localhost-server:
```text
location /nginx-status {
stub_status on;
access_log off;
allow 127.0.0.1;
deny all;
}
```