A database is a place where you store information. Cassandra is a type of database that is different from most databases because it does not use tables. Cassandra was developed by Facebook in 2008 as part of Facebook’s Open Compute Project. Cassandra is a NoSQL database that combines the speed of a key-value store with ... Read more
The ISPConfig update script is an easy way to update an ISPConfig 3 installation. If you want to make a manual backup of ISPConfig, see the instructions at the end of the article. This tutorial applies to ISPConfig 3.0, ISPConfig 3.1, and also ISPConfig 3.2. To update ISPConfig 3, log in as root user on ... Read more
The following article describes the steps that need to be taken to debug ISPConfig 3 server scripts. This procedure applies to all ISPConfig 3 versions incl. ISPConfig 3.1 and ISPConfig 3.2. Enable the debug Loglevel in ISPConfig Login to the ISPConfig interface and set the log level to Debug under System > System > Server ... Read more
I've got the following error message on Debian Linux with Courier IMAP server: Filesystem notification initialization error -- contact your mail administrator (check for configuration errors with the FAM/Gamin library) when I tried to access an IMAP share. The reason for the problem seems to be that the "fam" package was not working correctly. The ... Read more
Linux user quotas can be edited with the commands edquota or setquota on the shell. While edquota opens the quota settings in an editor like vim, setquota allows you to specify the quota settings on the command line. Example for disabling the quota for the user "testuser": setquota -u testuser 0 0 0 0 -a ... Read more
More and more internet access providers are closing port 25 to reduce spam except for connections to their own mail servers. If you run your own email server and have problems connecting to it on port 25, you can enable port 465 (SMTPS) in postfix as a workaround. Edit the /etc/postfix/master.cf file: nano /etc/postfix/master.cf and ... Read more
Most Linux servers are administered on the command line e.g. through an SSH connection. In the following tutorial, I will explain several shell commands that make it easy to view log files on the Linux command line (shell). These commands will work on all major Linux distributions incl. AlmaLinux, CentOS, Debian, Fedora, RockyLinux, and Ubuntu. ... Read more
Gradle is a build automation tool that is based on a concept called ‘incremental builds’. It speeds up the development process by, for example, building only those parts of the project that have been modified. Incremental build works by (conceptually) tracking which files were changed and then using this information to determine what needs to ... Read more
Apache Maven is a build automation tool that is used in many projects today. Maven provides coders and DevOps with a standard way to create and manage projects, as well as implement software project management processes such as maintenance, release, and reporting on the progress of the project. An important part of any software developer ... Read more
Every current disk includes a built-in monitoring feature known as SMART that keeps track of faults. On Linux, there is a software package called smartmontools that may be used to query the SMART status of the disk to see if it will fail soon. Installation apt-get install smartmontools Usage First we need to know the ... Read more