End-to-End Kubernetes with Rancher, RKE2, K3s, Fleet, Longhorn, and NeuVector

Technical Recommendations and Standards Used in This Guide

Recommended Environment

I recommend using a Linux-based environment. MacOS users can use the Terminal application, which is a Unix-based shell. Windows users can use the Windows Subsystem for Linux (WSL) or Git Bash, which provides a Unix-like environment.

Heredoc

In this guide, we will extensively make use of heredoc to create files. Heredoc is a way to create multi-line strings in Bash. It is a redirection method that allows you to pass multiple lines of input to a command. Here is an example:

cat <file.txt
Passwords are like underwear: 
- You shouldn’t leave them out where people can see them. 
- You should change them regularly. 
- You shouldn’t loan them out to strangers.
EOF

The <is the heredoc delimiter. The heredoc ends when the delimiter is encountered at the beginning of a line. The > operator redirects the output to a file. As a result, when you copy and paste the whole block to your terminal, it will create a file named file.txt with the content:

Passwords are like underwear:
- You shouldn’t leave them out where people can see them.
- You should change them regularly.
- You shouldn’t loan them out to strangers.

When >> is used instead of >, the content will be appended to the file instead of overwriting it.

When a variable is used inside a heredoc, it will be expanded. For example:

# export an environment variable
export ARGUMENT="world"

# create a file with the variable expanded
cat <file.txt
Hello, $ARGUMENT!
EOF