Cloudflare Domains doesn’t work with Digitalocean Droplets

When registering a new domain on Cloudflare, you need to keep two things in mind:

They don’t allow their domains to have non Cloudflare-branded nameservers. Which means that while the domain lives on Cloudflare, its DNS records will also have to stay.
Even newly registered domains have SSL/TLS configured to Full, so if you’re starting out with a new server, certbot will fail because HTTP traffic is not allowed.

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Git, Tools, Ubuntu

How to Auto-Deploy to Server on Git Push

Goal:

If git push on master branch
Then sync files onto server and deploy (e.g., running yarn run build or any other scripts)

I’m on DigitalOcean’s server, but this works on any self hosted servers.

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DigitalOcean: ssh Permission denied (publickey) when SSH as Created User

Allowing password login will undermine the safety of server, so instead we can set up SSH login for each user.

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Difference Between Postfix and Dovecot

There are two parts when it comes to dealing with mails:

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Can’t Login to WordPress wp-admin after Change of URL

Steps to change site URL without visual login panel:

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Assets Not Being Served With Rails

When assets within app/assets/ are not even being served. Goto config/environments/production.rb and change the value of following into:

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bower ESUDO Cannot be run with sudo

Edit /root/.bowerrc.

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Auto cd To Certain Directory Upon SSH Login

Edit ~/.bash_profile with your preferred editor.
Add cd /your/directive at the end.