CentOS 7 has a nice command called hostnamectl. With it we can display the current hostname, and set any of the three types of hostname: static hostname (something like example.com) transient hostname (anything you like, assigned when using DHCP) pretty hostname (something like Jay’s MacBook Pro) By default, a CentOS installation comes back with localhost.localdomain … Read more
Here’s how to do it: firewall-cmd –zone=internal –add-service=ssh –permanent firewall-cmd –zone=internal –add-source=1.2.3.4/32 –permanent firewall-cmd –zone=internal –add-source=5.6.7.8/32 –permanent firewall-cmd –zone=public –remove-service=ssh –permanent firewall-cmd –reload This declares an internal zone with two IPs (add as many or as few as you like) and subsequently removes the SSH service from the public zone altogether. As a result, any … Read more
I have worked on a server recently and I came across a problem (again) that I meant to write about, and include a solution should you suffer from a similar problem. It was a Plesk server running CentOS, but this particular issue can also happen on plain LAMP stacks. Trying to start Apache, I got … Read more
By default, CentOS 7 will display a list of all users on the system. Click on it, type in the password, and you’re in. This works well when you have a handful of users on the system. However, on systems with a lot of users, not everyone can be displayed in that list – and scrolling up … Read more
If you’ve read my previous article about how to enable automatic logins on CentOS 6, and it sounded a little daunting, you may be pleased to hear that it’s a little easier to accomplish the same thing on CentOS 7.1. If you’re using GNOME in a single user environment, and you’re confident that nobody else … Read more
I like setting up barebones CentOS and other flavoured VMs on my Mac via Parallels Desktop. Trouble is, for such things like time synchronisation to work properly, something called Parallels Tools needs to be installed on each VM. This is to make sure Parallels Desktop can speak to the VM and communicate with it properly. … Read more
You can update Plesk via the Web Interface (under Tools and Settings – Updates and Upgrades). However sometimes the interface times out, or browsers get confused – therefore it’s good to know that you can apply updates via the command line interface as well. In this article I’ll show you how (in Linux – I … Read more
By default Plesk on Linux uses Postfix for outgoing email, and by default listens on port 25 for outgoing SMTP mail. Some service providers do not allow to send emails on that port, and tragedy occurs: clients can’t send email with their Plesk servers. Not good. Other SMTP ports will usually work, such as the … Read more
