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;
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;
Again, the internet saved my VM.
If you move around a CentOS 6.x VM, your network MAC address can change. Here is how to fix it again.
Source: How to solve “Device eth0 does not seem to be present, delaying initialization” error – OSTechNix
How to set-up hotspot.
Firefox URL: http://detectportal.firefox.com/success.txt
Google Chrome URL: connectivitycheck.gstatic.com/generate_204
Internet Explorer URL:
Chomium URL: chrome.google.com
Following tools will help you detecting outdated software.
If your graphs are showing with ‘graph error’ and your disk is almost full, please follow the instructions below.
Add extra disk to your VM or to your machine and type following commands with root privileges.
# display disk name
# create partition
# type n enter enter enter enter w enter
# means new partition, default values accept, and write out changes
# extend physical volume group
vgextend observium-vg /dev/sdb1
# extend size in volume group and resize file system
lvextend -L +19G /dev/mapper/observium--vg-root
# check everything is ok
# now regenerate graphs that were missing
php discovery.php -h all
php poller.php -h all
Above assumes you are adding a second disk of 20 GB. sdb and +19G might need to change if your configuration is different.
Seems netbeans cannot work with OpenJDK 10/11 and stops silently shortly after start.
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.
CentOS minimal install can be stripped down to a more bare minimum.
Whether you are using CentOS for a build server or simply testing out a new configuration, you can quickly create a VM (virtual machine) that is under 1GB. You can do this without downloading any s…
Source: Creating Minimal Throw-away CentOS 6 VMs « irq5.io
One having worked with Sinclair QL must certainly appreciate this. Please enjoy reading the following stuff: Kilgus.net | Stuff I do
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.
Then the final step.
apt-get install --install-recommends winehq-stable
Source: Ubuntu – WineHQ Wiki