Problems signing in to AWS? When the login page “Sign in as IAM user” repeatedly says: “Your authentication information is incorrect. Please try again” though you entered correct information, your Gemalto token generator for MFA authentication could be out of sync.
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.
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.
This is easier than you probably think: AWS will expand the EBS boot volume of an EC2 instance running Linux automatically when you launch a new instance off of it with the desired capacity.
Here is how it works in more detail.
If you launch an instance from the official CentOS or RHEL 7.x AMI on AWS, you will be running kernel 3.1 as of this writing. That’s not a good idea. You can easily take advantage of improved security features of newer kernels that are already available in a stable release. The renowned Linux kernel maintainer Greg Kroah-Hartman released the Linux Kernel 4.14.15, which includes important fixes for Spectre & Meltdown. Here is how to update your Linux kernel from 3.1 to 4.16.11 in place.