Cyber security, infotech
The relentless onslaught of spam continues to drive mail administrators up the proverbial wall. DMARC, the unofficial successor to SPF (Sender Policy Framework), holds the promise of more email legitimacy, but can it deliver? Here is how you can put DMARC to the test.
There are two basic ways to migrate a mail server from one machine to another: with and without service downtime.
When setting up https on an existing server, you need to provide a redirect for all those visitors arriving via http backlinks. Here is how to do this.
The rsync utility can backup files, synchronize directory trees, and much much more, both on the local machine and between two different hosts—via push and pull. Here is how to tame it.
As zero-day exploits become increasingly common, keeping the kernel up to date is a top priority.
In CentOS 6.x/7.x and RHEL 6x./7.x, upgrading the Linux Kernel is a painful procedure which requires about a dozen steps. On Fedora, all it takes is a time-saving two-liner. You don’t need to concern yourself with the configuration of the grub boot manager, which is a frequent source of trouble on CentOS and RHEL.