LibreNMS manually adjust GPS coordinates for a Geo Location

The locations are stored in the LibreNMS locations table

mysql -u librenms -p librenms

To list all the locations

select * from locations;

Set the specific coordinates for a location using the following command.
Replace the lat and lng, also the id should match the line your wanting to update.

update locations set lat = "33.5140",lng = "-86.8178" where id=25;

LibreNMS dump devices in MySQL database

All the devices are stored in the librenms datebase devices table.

You can dump all of them with the following command from a shell prompt.

sudo mysql -u librenms  -p librenms -e "select hostname,sysName from devices"

Example output

[jim@localhost ~]$ sudo mysql -p librenms -e "select hostname,sysName from devices"
 Enter password:
 +----------------------------------------+--------------------------------+
 | hostname                               | sysName                        |
 +----------------------------------------+--------------------------------+
 | 192.168.1.1                            | linksys                        |
 | 192.168.1.9                            | wifi-unifi                     |
 +----------------------------------------+--------------------------------+

Install Oxidized on LibreNMS

Install Oxidized

Install Instructions from here

Install prerequisites

sudo yum -y install make cmake which sqlite-devel openssl-devel libssh2-devel ruby gcc ruby-devel libicu-devel gcc-c++

Install Ruby Gems

gem install oxidized
gem install oxidized-script oxidized-web

If you run into issues with installing the oxidized-web gem because of a ruby version, try installing ruby 2.6.1 via rvm the docs say install 2.1.2, but was having issues with it. 2.6.1 seems fine.

Install Oxidized

gem install oxidized 
gem install oxidized-script
gem install oxidized-web

Run Oxidized twice to generate the config

oxidized

If you have issues running oxidized due to an invalid or self signed ssl cert, you can either fix the cert or ignore it in the oxidized config. https://github.com/ytti/oxidized/pull/618/files

Modify the Oxidized config file in “/root/.config/oxidized/config” to look like this.

Modify the http portion of the config file to look like the following.

http:
url: https://localhost/api/v0/oxidized
scheme: https
secure: false

Setup Config

vi .config/oxidized/config

Setup the config, Basic config below, edit as needed

---
username: admin
password: password
model: airos
resolve_dns: true
interval: 3600
use_syslog: false
debug: false
threads: 30
timeout: 20
retries: 3
prompt: !ruby/regexp /^([\w.@-]+[#>]\s?)$/
rest: 127.0.0.1:8888
next_adds_job: false
vars: {}
groups:
airos:
username: ubnt
password: ubnt
routeros:
username: admin
password:
vars:
ssh_port: 2222
models: {}
pid: /home/incredigeek/.config/oxidized/pid
crash:
directory: /home/incredigeek/.config/oxidized/crashes
hostnames: false
stats:
history_size: 10
input:
default: ssh, telnet
debug: false
ssh:
secure: false
ftp:
passive: true
utf8_encoded: true
output:
default: file
file:
directory: /home/incredigeek/.config/oxidized/configs
source:
default: http
debug: false
http:
secure: false
scheme: https
url: https://localhost/api/v0/oxidized
map:
name: hostname
model: os
group: group
headers:
X-Auth-Token: '3wq2b87fj4e6fb5987b5812t6ej9709g'
model_map:
cisco: ios
juniper: junos
mikrotik: routeros

Setup as system service

Find the “oxidized.service” file, should be in

/usr/local/rvm/gems/ruby-2.6.1/gems/oxidized-0.25.1/extra/oxidized.service

and copy it to

/usr/lib/systemd/system/

Edit it and change the user and try to launch it

systemctl start oxidized

If it fails, you may need to substitute the ExecStart= variable to the following more info

ExecStart=/usr/local/rvm/gems/ruby-2.6.1/wrappers/oxidize

Change the ruby number if yours is different.

Enable the service on system boot up and start

systemctl enable --now oxidized

Check that oxidized is running

systemctl status oxidized

LibreNMS config

Add the following to your /opt/librenms/config.php config file.

# Oxidized configuration
$config['oxidized']['enabled'] = TRUE;
$config['oxidized']['url'] = 'http://127.0.0.1:8888';
$config['oxidized']['features']['versioning'] = true;
$config['oxidized']['group_support'] = true;
$config['oxidized']['default_group'] = 'default';
$config['oxidized']['reload_nodes'] = true;# Oxidized configuration
$config['oxidized']['enabled'] = TRUE;
$config['oxidized']['url'] = 'http://127.0.0.1:8888';
$config['oxidized']['features']['versioning'] = true;
$config['oxidized']['group_support'] = true;
$config['oxidized']['default_group'] = 'default';
$config['oxidized']['reload_nodes'] = true;
$config['oxidized']['ignore_os'] = array('linux','windows');
$config['oxidized']['ignore_types'] = array('server','power');

LibreNMS should now feed Oxidized the devices.

You can check in the LibreNMS interface to see if it is getting the configs. https://librenms/oxidized

where librenms is your LibreNMS servers ip/hostname.

LibreNMS enable RRDCached on CentOS 7

Commands from https://docs.librenms.org/Extensions/RRDCached/

Create System Service

sudo vi /etc/systemd/system/rrdcached.service
[Unit]
Description=Data caching daemon for rrdtool
After=network.service
[Service]
Type=forking
PIDFile=/run/rrdcached.pid
ExecStart=/usr/bin/rrdcached -w 1800 -z 1800 -f 3600 -s librenms -U librenms -G librenms -B -R -j /var/tmp -l unix:/run/rrdcached.sock -t 4 -F -b /opt/librenms/rrd/
[Install]
WantedBy=default.target

Save with esc + :wq

Enable rrdcached service on boot up and start the service now

systemctl enable --now rrdcached.service

Enable RRDcached in librenms config

vi /opt/librenms/config.php

add/edit the following line. If it is commented out, uncomment it

$config['rrdcached'] = "unix:/run/rrdcached.sock";

Save with esc + :wq

Check the disk IO after a little bit to see if it went down.

LibreNMS manually clean up MySQL Syslog Database

Adding the following option to the config.php file is supposed to delete anything over 30 days.

$config['syslog_purge']                                 = 30;

You can also manually delete the entries out of the MySQL database by logging into MySQL, selecting the librenms database, and running the command below.

The command deletes all entries older than 12/9/2018 at 08:00. Change the date and time as needed.

DELETE FROM syslog WHERE timestamp < '2018-12-9 08:00:00';

The following link has some more clean up options.
https://docs.librenms.org/Support/Cleanup-options/

LibreNMS bulk delete

There is a php script in /opt/librenms/ that lets you delete a host from the command line.

sudo /opt/librenms/delhost.php 192.168.1.20

Replace 192.168.1.20 with the hostname/ip address of the host you want to delete.

Delete Multiple Hosts

First you’ll need to get a list of devices you want to remove.  You can do this by viewing the devices in the LibreNMS MySQL database;

Example:

$ mysql -u librenms -p librenms
MariaDB [librenms]> select hostname from devices;
+----------------------------------------+
| hostname |
+----------------------------------------+
| 192.168.88.1 |
| 192.168.1.20 |
| 192.168.1.12 |
| 192.168.88.5 |
4 rows in set (0.00 sec)
MariaDB [librenms]> exit

Put all the IP addresses you want to remove into a file and run the following for loop.  Replace “remove_ip.lst” with the name of your ip list file.

for i in `cat ~/remove_ip.lst`; do sudo /opt/librenms/delhost.php $i; done

LibreNMS Error: Missing dependencies! Run the following command to fix:

Received this error while trying to access LibreNMS in web browser.

Error: Missing dependencies! Run the following command to fix:

./scripts/composer_wrapper.php install –no-dev

 

Tried sshing into the LibreNMS server and running the script, but that didn’t fix the issue.

Ran ./validate.php and it came up with the some of the following errors.

[FAIL] Missing PHP extension: mbstring
[FIX] Please install mbstring
[FAIL] The poller (localhost.localdomain) has not completed within the last 5 minutes, check the cron job.
[WARN] Your install is over 24 hours out of date, last update: Thu, 7 May 2018 19:18:35 +0000
[FIX] Make sure your daily.sh cron is running and run ./daily.sh by hand to see if there are any errors.

Installed mbstring.  You may need to change the number if yum is complaining about package conflicts.  Use “yum search mbstring” to show all the versions available.

yum install php71w-mbstring

Ran ./validate.php again and it wanted this script run

./scripts/composer_wrapper.php install --no-dev

Restart Apache

systemctl restart httpd

Add Self Signed SSL certificate to LibreNMS in CentOS

Install mod_ssl

yum install mod_ssl -y

Create Directory for SSL key.

mkdir /etc/ssl/key
chmod 700 /etc/ssl/key

Create certificate.

openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/pki/tls/private/localhost.key -out /etc/pki/tls/certs/localhost.crt

Fill out the info or what is applicable.

Now edit the LibreNMS Apache config file /etc/httpd/conf.d/librenms.conf

All you have to do is add the following three lines under the VirtualHost and change *:80 to *:443.

SSLEngine on
SSLCertificateFile /etc/pki/tls/certs/localhost.crt
SSL CertificateKeyFile /etc/pki/tls/private/localhost.key

So when your finished the file should look like this.

<VirtualHost *:443>
 DocumentRoot /opt/librenms/html/
 ServerName server_hostname_or_IP
 SSLEngine on
 SSLCertificateFile /etc/pki/tls/certs/localhost.crt
 SSLCertificateKeyFile /etc/pki/tls/private/localhost.key
 CustomLog /opt/librenms/logs/access_log combined
 ErrorLog /opt/librenms/logs/error_log
 AllowEncodedSlashes NoDecode
 <Directory "/opt/librenms/html/">
 Require all granted
 AllowOverride All
 Options FollowSymLinks MultiViews
 </Directory>
</VirtualHost>

Don’t forget to allow https/port 443 traffic through the firewall.  Guide here

If you have any issues, you may need to chmod the key and crt file.

chmod 644 /etc/pki/tls/certs/localhost.crt
chmod 644 /etc/pki/tls/private/localhost.key

You should now be able to access LibreNMS using https.  Note, you’ll need to allow an exception in your browser for your self signed certificate.

https://LibreNMS_IP_Address