CentOS / RHEL 7 / Debian – Disable IPv6

If network troubleshooting leads you to believe there’s an issue with IPv6, you may need to shut down that protocol on your Linux machines. Since some hardware doesn’t take advantage of IPv6 (and most admins are still working with IPv4), a temporary and easy solution is to disable IPv6. Read More …

CentOS / RHEL 7 – Regenerate UUID for Network Cards (Physical and Virtualized Environments)

Usually, when cloning VMs on virtualized systems (Hyper-V or VMware, for example) an issue could occur related to vNICs: a vNIC could be renamed and so no more the same of the old VMs (obviously). Read More …

Linux – Make immutable a file

The chattr command is used by system administrators to restrict the users from changing a file in a particular way or even the administrator can by mistake delete a critical file because of a mis-typed command. But if the immutable flag is set, these mistakes can be avoided. Read More …

Powershell – Force gpupdate on all Domain Computers

Client computers update Group Policies every 90 minutes by default, in a functional and working domain. In this brief article Read More …

Configuring Let’s Encrypt TLS Certificates

Let’s Encrypt® has revolutionized the way to obtain, install and use TLS/SSL certificates for websites and other services. With its Read More …