How do you recover your confidence after you fail?

It says in the book of Proverbs: Seven times the righteous man falls and gets up.

The falling is an intrinsic part of the process.

So when a person fails, they need to get up and try again and realize that while they have failed, they are not a failure. 

 

Usually a detail and public "postmortem" will get your confidence back!  Cloudflare is a very good example, they frequently post public detail technical postmortem on their outages.

I always maintain that,

I would rather be on my deathbed thinking back going "well, That was really stupid. What were you thinking?" instead of laying there thinking, "I wonder what would have happened if only I had..."

Firstly don’t consider it a failure. Look at the bright side and to take learning’s from it.
Speak to your mentor or hear and dear ones, bounce back.
A leader is defined by what s/he focuses in the future than to rue the past.

Thank you everyone for such inspiring responses. This question was inspired by a fantastic conversation I had with Beth-Anne Bygum last week!