Web applications, blogs? You need web monitoring tools!
In French the word "present" has two meanings: the present, this moment that you are reading this article, or a gift among others. There is no confusion here, but the adjective "free" can mean free, without cost, and free, that he has freedom. Today we will see several free applications that you can use as web monitoring tools junior linux administrator.
Web server monitoring
What are we looking for in web monitoring tools? What is a web server?
It is a computer or device capable of offering information or data by means of a protocol (or securely by HTTPS). For your supervision, we consider two main areas: internal supervision and external supervision.
In the internal part, there are three crucial points:
General state of your Web server: load, disk space, temperature of the components (if not virtual), ie the basic values of any server.
Web traffic: open connections, listening, addresses, etc.
Information in the logs : it is very important to configure, since you have several domains on the same web server, each with its independent file.
For external supervision :
Simple tests: if it is online, response time, certificates expiration (if using HTTPS), etc.
Transactional web monitoring: it monitors the processes that respond to a series of steps. The simplest example is if a user can connect to your web server (say you have a simple blog with WordPress installed).
Pandora FMS
If you are a new reader of our blog, here is a surprise: the free version of Pandora FMS is able to work with the 3 points of internal supervision (by means of software agents) and the first point of external supervision!
Can't you believe it ? I explain to you.
You can find more information on everything that has been described so far at this link .
You are probably using a web server with Apache: for this specific case we have a great article written by the creator and founder of Pandora FMS.
The network management (local or extended) indirectly participates in the Web supervision.
After using Pandora FMS and / or some of the web monitoring tools shown here, you can perform web optimization , since the performance of web applications has become a key element for the proper functioning of organizations.
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Web monitoring tools
I come back to the subject of free or "free" applications: the web monitoring tools that I include also have more permissive licenses, like the one from MIT or the same Apache license, or more restrictive such as the free ones. Since this is a very broad subject, Wikipedia collects a large number, if not all.
Another type of web monitoring tool that I must name is the one offered as a physical service from different parts of the world. Although some are free programs , it is obvious that there is a monetary cost to maintain virtual or real machines all over the planet, so that they regularly access your website from so far away and let you know.
With these explanations, let's now see the web monitoring tools.
Only
Yes, you yourselves, as programmers, can use "real user supervision," placing specific instructions before and after your code does read and / or write operations on your web server, then by keeping an additional journal. Later, we'll see its counterpart, User Experience ( UX ).
I must also mention the figure of the "poor man": on the CodeProject site there is a tool with a personalized free license which indicates how to work practically by hand (I do not recommend this method, I include it only for educational purposes) .
Linux Dash
I consider it the lightest, but don't be fooled by appearances. It has been created in a minimalist but versatile way: you can use Go, Python or Node.js languages, because surely some of these working environments are already installed on your system. This way, you don't add a load just to install a web monitoring tool.
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