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 …

CentOS / RHEL – Managing Networking Service

One of the most common activities on a Linux system is, usually, modify some networking parameters to adapt the system to the actual network; so how can we restart networking service using command line options without restarting the whole system? How can I start / stop and restart networking service on a CentOS/RHEL 7 based system? Read More …

Limit access SSH with Match option (openSSH)

OpenSSH has a lot of nice features which let you control how it is used. For example, you can disallow Read More …

500 OOPS: vsftpd: refusing to run with writable root inside chroot()

These instructions are intended specifically for solving the error: 500 OOPS: vsftpd: refusing to run with writable root inside chroot(). Read More …

Install Local RPM or DEB Files on Linux

One of the common problems you may encounter with a Linux server is that locally-installed packages require dependencies in order Read More …