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cURL can connect to localhost but not 127.0.0.1

Recently came across a scenario, where curl was able to connect to localhost but not 127.0.0.1. When I tried curl 127.0.0.1:80, it just

How to know you're inside a container

Scenario: You SSH into an Ubuntu server. How do you know if you just logged in inside a docker container, or just a regular VM? Turns out there are no

Closing an open file without killing a process

In the previous post we figured out how to find the process which is writing an open file. And we also saw that we can kill the process and it'll

Find out which process is writing to a file

Scenario: Imagine you login to a server and you find that the disk is filling up rapidly. Either by using df -h or du -h -d1 /

or getting errors like