There are two basic ways to migrate a mail server from one machine to another: with and without service downtime.
How to redirect all http to https in NGINX
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.
How to use rsync to transfer files and directories between hosts
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.
How to upgrade the Linux kernel in Fedora 28/29 quickly and easily
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.
How to install the most recent version of OpenSSL on Windows 10 in 64 Bit
In the age of cyber warfare, being paranoid is the only reasonable attitude and that means, among other things, being paranoid about software updates.
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