linux - How do you make it obvious you are on a production system?

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A few of us at my company
have root access on production servers. We are looking for a good way to make it
exceedingly clear when we have ssh'd in.

A few ideas we have had
are:

• Bright red
  prompt


• Answer a riddle before getting a
  shell


• Type a random word before getting a
  shell

What are
some techniques you guys use to differentiate production systems?

Answer

The red prompt is a good idea, which I also
use.

Another trick is to put a large ASCII-art
warning in the /etc/motd file.
Having something like
this greet you when you log in should get your
attention:

 _______ _ _ _____ _____
            _____ _____ 
|__ __| | | |_ _|/ ____| |_ _|/ ____| /\ 

 |
            | | |__| | | | | (___ | | | (___ / \ 
 | | | __ | | | \___ \ | | \___ \ / /\ \
            
 | | | | | |_| |_ ____) | _| |_ ____) | / ____ \ 
 |_| |_|
            |_|_____|_____/ |_____|_____/ /_/ \_\


 _____ _____ ____
            _____ _ _ _____ _______ _____ ____ _ _ 
| __ \| __ \ / __ \| __ \| | | |/
            ____|__ __|_ _/ __ \| \ | |
| |__) | |__) | | | | | | | | | | | | | | || | | |
            \| |
| ___/| _ /| | | | | | | | | | | | | | || | | | . `
            |

| | | | \ \| |__| | |__| | |__| | |____ | | _| || |__| | |\
            |
|_| |_| \_\\____/|_____/ \____/ \_____| |_| |_____\____/|_|
            \_|


 __ __ _____ _ _ _____ _ _ ______ 
| \/ |
            /\ / ____| | | |_ _| \ | | ____|
| \ / | / \ | | | |__| | | | | \| | |__
            
| |\/| | / /\ \| | | __ | | | | . ` | __| 
| | | |/ ____ \ |____| |
            | |_| |_| |\ | |____ 
|_| |_/_/ \_\_____|_| |_|_____|_|
            \_|______|

You could
generate such a warning on rel="noreferrer">this website or you could use the
figlet

command.

src="https://i.stack.imgur.com/mrtNk.png"
alt="figlet">

Like Nicholas Smith suggested
in the comments, you could spice things up with some dragons or other animals using the
cowsay command.

src="https://i.stack.imgur.com/rZJh9.png" alt="dragon
cowsay">

Instead of using the
/etc/motd file, you could also call cowsay or
figlet in the .profile
file.