Blog Category: How To
Running applications in containers provides many benefits, and it's not just hype. Higher velocity to maintain changes while keeping a service available. Scaling your software by just spinning up more instances to handle load. Container images allow you to manage your application dependencies and link them all to a portable and standardised runnable container image. The [...]
A monitoring solution should always help in bad situations and provide a useful overview of your system health status. Service availability monitors are especially handy to ensure that all services are running on the correct machines. In past, I have run into an problem which was more of an issue with documentation than a classical monitor [...]
Network Attached Storage devices are very popular in small or medium offices or at home to store and share data. Synology is one of the manufactures who build their devices with SNMP support to provide monitoring and managment capabilities. This makes it very easy to let OpenNMS keep an eye on your NAS and it can tell [...]
System has high load! Sounds anything but perfect. At least when we are talking about servers. Fortunately, I don't have to explain what load is or how it's defined because there are many explanations on the internet. I found my favorite one on blog.scoutapp.com. Once you read the article, you know that the ideal load on a [...]
Recently, we have been working on a project called "Helm" which will integrate a convenient OpenNMS alarm dashboard into Grafana. As part of that process, we have been developing a pure-JavaScript API for interacting with OpenNMS's ReST services called "OpenNMS.js". OpenNMS.js is primarily designed for developers, making it easy to write Node.js [...]
As soon you provide more than a handful of services monitoring and centralized logging becomes essential. Especially when you run the Net-SNMP daemon with Docker you will notice your logs get spamed with some messages like Cannot statfs /run/docker/netns/...: Permission denied everytime you query for performance data. The Wiki article is a small guide how to configure the [...]
Now and then websites are really important for daily business and private life. You can nearly buy everything on websites, find information, meet friends, watch movies and much more. All the worse if your website is not working and you don't notice it or your customer first. But even if you already have some monitoring for [...]
Most of today's servers run in virtual environments and Java applications in containers. Sometimes these applications or servers unexpectedly restart and can often go unnoticed because a restart can be much faster then a polling cycle. If SNMP is enabled, the hrSystemUptime can detect restarts from Windows or Linux machines. Similarly, this concept can also be [...]
Security updates are important and need to be installed regularly and as quick as possible. In Linux distributions like Ubuntu and Debian this is easily done with the apt package manager. Most of the security updates can be installed without rebooting your system. If you upgrade your Kernel it is required to restart your system and [...]
A self-sufficient printer environment OpenNMS usually stands for network and server monitoring. But like every good tool you can use (or misuse?!) OpenNMS in other scenarios as well. If that is a good solution, is completely your choice! :-) Imagine, you have a big printer environment, distributed in different locations and you don't want to order [...]