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.
Correcting SELinux security contexts: how to adjust SELinux labels on your file system
In an administrator’s quest to get stuff done, SELinux tends to get in the way. It is being perceived as a nuisance rather than a feature and this happens mostly for only one reason: setting correct SELinux labels requires the ability to figure out the appropriate SELinux security contexts. Here is how to do it.
A quick guide to a solid DNS configuration using AWS Route 53 (and how to configure DNS using any other DNS service)
The most difficult thing about configuring the DNS settings for a domain is designing a plan of action: making up one’s mind about what kind of services you envision and how you want to route the traffic. Here’s a primer on how to configure DNS using Route 53 or any other service.
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.
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