Category: Linux

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How to add image to Nagios chart

We assume following configuration:

  • FAN installation containing Nagios and Centreon installed on CentOS 5.9
  • IP of Nagios: 10.50.100.101
  • You are owner of a working machine with linux or macos (windows users will need to use putty for some of the steps or install an ftp server on the centreon machine)

First step, prepare your image

Create an image of 40 by 40 pixels and in PNG format. In order to blend in the image with Nagios, make sure that the parts around the image are transparent. (Alpha layer PGN).

Second step, upload your image

Normally speaking, your server should only support following protocols. HTTPS (or HTTP for local deployments) and SSH. If you have FTP running on your server, things are different, but here we assume we only have HTTP/SSH. We also assume the root account is accessible from the outside. If not (e.g. debian default install) one will have to copy to the user having remote access over SSH.

scp image.png root@10.50.100.101:/root
scp image.png user1@10.50.100.101:/home/user1

Third step, copy the image to the right folder on the server

Please note the second operation is a move operation. Make sure to execute the steps in the correct order. 

cp /root/*.png /usr/share/centreon/www/img/media/logos/
mv /root/*.png /usr/share/nagios/images/logos/

Normally, a chown apache:apache to the files would be required in order to make the files readable for Nagios, but this seems to be working without. Just for the sake of correctness, please find following commands.

chown apache:apache /usr/share/centreon/www/img/media/logos/
chown apache:apache /usr/share/nagios/images/logos/

Forth step, refresh the server

Log-in to centreon, go to administration, options, media and select synchronise media. Now you should be able to use the image on any network device.

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Observium installation on Debian 9 – adding devices fails

Installing fresh Observium (18.9.9420) (community version) on Debian 9 does not end up with a working installation.  (See Observium documentation)

Only one device is added, that cannot be viewed afterwards.

Possible solution: modify the database structure after installation and before adding your devices.

Start checking if the devices_id field has an auto-increment value set and is the primary key.

One can do so by issuing following commands:

mysql>show columns from devices from observium;

or alternatively:

mysql>show create table devices;

If the auto-increment value is missing, please add it:

mysql> use observium;

mysql> alter table devices change column device_id device_id int(11) not null auto_increment;

Easy fix, but takes some time to find out.

Some background information from the logs:

##### Software versions #####

o OS Linux 4.9.0-8-amd64 [amd64] (Debian 9.6)
o Apache 2.4.25
o PHP 7.0.33-0+deb9u1 (OPcache: DISABLED)
o Python 2.7.13
o MySQL 10.1.37-MariaDB-0+deb9u1 (extension: mysqli 5.0.12-dev)
o SNMP NET-SNMP 5.7.3
o RRDtool 1.6.0
o Fping 3.15 (IPv4 and IPv6)

##### Memory Limit #####

o PHP Unlimited

##### MySQL mode #####

o MySQL NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

##### Charset info #####

o PHP UTF-8
o MySQL utf8

##### Timezones info #####

o Date Wednesday, 15-May-19 13:35:30 CAT
o PHP +02:00
o MySQL +02:00

After making the change, please check the auto_increment value is there.

show columns from devices from observium;
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Mint upgrading from 18.3 to 19 – Netbeans broke

Seems netbeans cannot work with OpenJDK 10/11 and stops silently shortly after start.

Solution:

uninstall 8.1 from software list and/or remove manual installation from /usr/local

Install OpenJDK 1.8

Download latest 8.2 from netbeans.org.

Install Netbeans 8.2 in current user (aka path /home/youruser). Also install Glassfish/Tomcat in current user. For some reason, installation in /usr/local does fail.

During installation, point your java jdk to /usr/lib/jvm/openjdk-1.8.

Please note that editing the /etc/netbeans.conf file as indicated by some sites is not resolving the issue.

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Mint update from 18.3 to 19 – Wine broke

After updating from Linux Mint 18.3 to 19, wine stopped working. This is what was required to correct.

sudo all below commands if required

dpkg --add-architecture i386
apt-add-repository 'deb https://dl.winehq.org/wine-builds/ubuntu/ bionic main'
wget -nc https://dl.winehq.org/wine-builds/Release.key
apt-key add Release.key

Check if you do not have duplicate lines from an earlier install.

vi /etc/apt/sources.list.d/additional-repositories.list

Then the final step.

apt-get update
reboot

apt-get install --install-recommends winehq-stable

Source: Ubuntu – WineHQ Wiki

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Unknown media type in type Fix

If Linux Mint 19 (Tara) shows error during update fril 18.3.

Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'

To fix run following with sudo user:

cd /usr/share/mime
grep -R all/all *

in kde xml, remove the sections containing:
<mime-type type="all/allfiles">
<mime-type type="all/all">

sudo vi packages/kde.xml

the other files showing these sections can remain untouched.

Then run following, no errors should occur

sudo update-mime-database /usr/share/mime

Source: Unknown media type in type Fix