Jasur Yusupov jzr-supove

psql: FATAL: Peer authentication failed for user “postgres” (or any user)

The connection failed because by default psql connects over UNIX sockets using peer authentication, that requires the current UNIX user to have the same user name as psql. So you will have to create the UNIX user postgres and then login as postgres or use sudo -u postgres psql database-name for accessing the database (and psql should not ask for a password).

If you cannot or do not want to create the UNIX user, like if you just want to connect to your database for ad hoc queries, forcing a socket connection using psql --host=localhost --dbname=database-name --username=postgres (as pointed out by @meyerson answer) will solve your immediate problem.

But if you intend to force password authentication over Unix sockets instead of the peer method, try changing the following pg_hba.conf* line:

from

collapsible markdown?

CLICK ME

yes, even hidden code blocks!

print("hello world!")

How to add a collapsible section in markdown

1. Example

Click me

Heading

Foo
Bar
- Baz

Qux

`vs` Questions

http://stackoverflow.com/questions/804115 (rebase vs merge).
https://www.atlassian.com/git/tutorials/merging-vs-rebasing (rebase vs merge)
https://www.atlassian.com/git/tutorials/undoing-changes/ (reset vs checkout vs revert)
http://stackoverflow.com/questions/2221658 (HEAD^ vs HEAD~) (See git rev-parse)
http://stackoverflow.com/questions/292357 (pull vs fetch)
http://stackoverflow.com/questions/39651 (stash vs branch)
http://stackoverflow.com/questions/8358035 (reset vs checkout vs revert)

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

There are always 24 hours in a day.
February is always 28 days long.
Any 24-hour period will always begin and end in the same day (or week, or month).

Directories on host machine:

/data/certbot/letsencrypt
/data/certbot/www
Nginx server in docker container

docker run -d --name nginx \

Fun and creative ways of generating random numbers in python

Here I'm going to show some creative and fun ways of generating random numbers without using random package in python.

Example 1 - Generating random number in range 0-9

When we call time() function of the package time, it returns floating point number - current time in seconds since the Epoch:

>>> time.time()
3392849227.6848479

how to leverage oracle's temping offers

free tier limits

The limits of the free tier say that you can create up to 4 instances.

x2 x86 instances (2core/1g)
x2 ampere instances (with 4core/24g spread between them)
200GB total boot volume space across all intances (minimum of 50G per instance)

	#!/bin/sh

	# Author : Wang Poh Peng
	# Description : Use FFMPEG to download videos into mkv or mp4 format

	RED='\033[1;31m'
	NC='\033[0m' # No Color
	GREEN='\033[0;32m'
	CYAN='\033[0;36m'

	import base64
	from cryptography.hazmat.backends import default_backend
	from cryptography.hazmat.primitives.asymmetric import rsa
	from cryptography.hazmat.primitives import serialization
	from cryptography.hazmat.primitives import hashes
	from cryptography.hazmat.primitives.asymmetric import padding


	def utf8(s: bytes):
	return str(s, 'utf-8')