configuration

How to manually change the PHP version of a website or web application running in a PHP-FPM pool?

botond published 2024/02/17, Sat - 01:33 time
Using PHP-FPM (FastCGI Process Manager) to run web pages and web applications has many advantages, especially when compared to older techniques such as PHP running as an Apache module. One of the most important benefits is that PHP-FPM significantly improves performance and scalability by allowing finer-grained management and optimization of PHP processes. In this way, we can use the server's resources more efficiently, reduce the response time, and our system can remain stable even in the event of heavy traffic. However, over time, the PHP versions of our web applications may become outdated, which the various control panels do not update. In this description, we will see in a few steps how we can easily modify our manual settings so that our websites and web applications also work with the correct PHP version.

How to fix "554 5.7.1 Service unavailable; Client host blocked using zen.spamhaus.org; Error: open resolver;" from our server delivery of bounced letters with an error message?

botond published Jan. 2023, 03, 22:11 p.m. time
When conducting electronic correspondence, mail servers strive to filter out unsolicited mail (spam) as efficiently as possible. From time to time it happens that these spam filtering services get blocked by letters that do not contain anything that would justify this. Therefore, it may happen with us that we cannot send an email to a recipient, or that we cannot receive mail from others on our own server. In this description, we will investigate one of the more common server-side "554 5.7.1 Service unavailable; Client host blocked using zen.spamhaus.org; Error: open resolver;" type error.

How to defend against attacks resulting in large volumes of 404 or other 4xx HTTP error codes with Fail2Ban

botond published 2023/03/14, k - 00:38 time
Our websites are constantly under attack from the outside world. The vast majority of these are done by robots, which try to discover the weak points of the websites running on the server. Some of the robots with this purpose try to do this by making various seemingly random HTTP requests to our websites, most of which are directed to non-existent URL addresses. As a result, our server responds with a 404 HTTP response code. In this description, we will look at how to ban the large number of attempts resulting in 404 and other 4xx HTTP response codes using Fail2Ban.

How to upgrade our perfect server based on Debian 10 (Buster) to Debian 11 (Bullseye) (page 3)

botond published 2023/01/31, k - 11:30 time
Another era has come again, when our Debian 10 (Buster) server has also run out of time, and it has become a burning task to do something about this problem. In this tutorial, we will upgrade a perfect Debian 10 (Buster) server to Debian 11 (Bullseye). On this page, we review the basic system as well as our higher-level server services and make the necessary subsequent settings.

Server monitoring with Monit on Debian and Ubuntu systems (page 2)

botond published March 2023, 01, Thu - 26:02 time
Monit is a free and open source process and resource monitoring tool that can be used to monitor system processes and resources using a web browser and command line. Monit automatically stops or restarts processes or services if, for example, they use too many resources or behave abnormally. It also sends email alerts about various events.
On this page, we will perform some fine-tuning on an existing Monit instance (installed and configured by the ISPConfig automated installer) on a Debian 11 (Bullseye) perfect server to make it work properly for us.

Server monitoring with Monit on Debian and Ubuntu systems

botond published March 2023, 01, Thu - 26:02 time
Monit is a free and open source process and resource monitoring tool that can be used to monitor system processes and resources using a web browser and command line. Monit automatically stops or restarts processes or services if, for example, they use too many resources or behave abnormally. It also sends email alerts about various events.
On this page, we install the Monit system monitor program on a Debian 10 (Buster) perfect server version 1.1, where it was not used before, and then set it up.

How to set the default website on our ISPConfig server so that the Apache2 Debian Default page is not loaded when accessing the server's IP address or full hostname

botond published 2023/01/21, Sat - 00:20 time
Our ISPConfig server handles our websites nicely, however, if we refer to the server's IP address or full hostname in the browser, we do not get the expected result, because in this case the Apache2 Debian Default Page is loaded, which is essentially Apache's "welcome" page. Of course, this is not a tragic mistake, but a beauty mistake. In this description, we will see how we can configure our Apache web server so that the website we want is loaded.

How to build and arming our ISPConfig3 server and how to secure our control panel, main services and websites with Let's Encrypt SSL (page 3)

botond published 2023/01/20, p - 23:19 time
With the help of the ISPConfig control panel, we can easily manage the websites on our server, as well as other web services. In this description, we will review how to build and provision our ISPConfig3 server, as well as how to set up free SSL certificates issued by Let's Encrypt for the control panel, main services and our websites. On this page, we check the web services and other components running on the server, then we set up the Let's Encrypt SSL certificates for the control panel and the required services and websites. Finally, we perform a few more fine-tuning tasks and eliminate any problems that may arise.

How to build and arming our ISPConfig3 server and how to secure our control panel, main services and websites with Let's Encrypt SSL (page 2)

botond published 2023/01/20, p - 23:16 time
With the help of the ISPConfig control panel, we can easily manage the websites on our server, as well as other web services. In this description, we will review how to build and provision our ISPConfig3 server, as well as how to set up free SSL certificates issued by Let's Encrypt for the control panel, main services and our websites. On this page, we create the primary web account and email account, then we use an external, free service to use secondary name servers, and finally we redirect the domain name to our server, making it accessible from the outside.