DEV Community: sadasdkjoiwck

Rename osx to macos

sadasdkjoiwck — Tue, 07 Dec 2021 18:34:41 +0000

The osx plugin is deprecated and has been renamed to macos. Please update your .zshrc to use the macos plugin instead.

Confused what to change ?

Open your terminal
nano ~/.zshrc hit return
Search for plugins

Example,

plugins=(git colored-man-pages colorize pip python brew osx)

Change it to

plugins=(git colored-man-pages colorize pip python brew macos)

Replace osx to macos
Ctrl + o and Ctrl + x hit return
Close terminal and reopen

Cover image by forgeskiphire

Django on AMI

sadasdkjoiwck — Tue, 13 Oct 2020 19:49:14 +0000

If you're using AMI then there are few things to take note before proceeding.

AMI have yum as package manager.
AMI Linux 2 has amazon-linux-extras which are available as topics

Setup the environment

sudo yum update -y

sudo yum install gcc

cat /var/run/yum.pid

ps -p 3633

ps -ef | grep 3633

kill -9 3633

sudo amazon-linux-extras install python3

curl -O https://bootstrap.pypa.io/get-pip.py
python3 get-pip.py
python3 -m pip install --upgrade pip

yum search pip
sudo yum install python3-pip

python3 -m venv /path/to/new/virtual/environment

sudo pip3 install virtualenv

sudo amazon-linux-extras install nginx1

mkdir project-name
cd project-name

virtualenv env
. env/bin/activate

pip3 install django

pip3 install uwsgi

django-admin --version

uwsgi --socket /opt/uwsgi/sock/yt_demo.sock --wsgi-file /home/ec2-user/project/testsite/testsite/wsgi.py

Note: I have taken help from multiple source and prepared this article. And all source deserves to receive the credits.

Credits,

python3 installation on Amazon linux 2 answer on stackoverflow
how to fix yum lock from other blog
how to upgrade sqlite to latest version on stackoverflow
pip installed package location explanation on stackoverflow
how to run simple django application by digital ocean
how to install mariadb blog
troubleshoot mariadb uninstall stackoverflow
mariadb pid troubleshoot blog
mariadb official documentation
migrate database with mariadb for django troubleshoot from stackoverflow and other blog
get uwsgi and nginx working together stackoverflow and digital ocean blog
make old migration clean ups blog
uwsgi, nginx on centos blog

Wordpress on AWS EC2 ubuntu

sadasdkjoiwck — Tue, 13 Oct 2020 19:48:12 +0000

sudo apt update -y
sudo apt upgrade -y

sudo apt-get install apache2
sudo systemctl start apche2
sudo systemctl status apche2
sudo systemctl enable apache2
sudo apt-get install mariadb-server mariadb-client -y

sudo systemctl start mariadb
sudo systemctl status mariadb

sudo mysql_secure_installation

sudo systemctl restart mariadb

sudo apt-get install php php-mysql php-gd php-cli php-common -y

sudo apt-get install wget unzip -y

sudo wget https://wordpress.org/latest.zip

sudo unzip latest.zip

sudo cp -r wordpress/* /var/www/html/

cd /var/www/html

sudo chown www-data:www-data -R /var/www/html/

sudo rm -rf index.html

sudo mysql -u root -p

create database wordpress;

create user "wpadmin"@"%" identified by "wpadminpass";

grant all privileges on wordpress.* to "wpadmin"@"%";

exit

insert those details on public web address on wordpress intallation and done.

export and import mariadb database

sadasdkjoiwck — Tue, 13 Oct 2020 19:47:41 +0000

sudo mysql -u root -p

use mysql;

select user, password from user;

show databases;

exit;

sudo mysqldump -u wpadmin -p wordpress > /home/ubuntu/try.sql

head -n 5 try.sql

ll -sha

sudo mysql -u root -p

create database new_database;

exit;

sudo mysql -u root -p new_database < try.sql

sudo mysql -u root -p

show databases;

use new_database;

show tables;

describe wp_users;

select user_login, user_pass, user_email from wp_users;

exit;

Attach new EBS to your EC2 instance

sadasdkjoiwck — Sat, 29 Aug 2020 20:01:17 +0000

No long stories straight steps.

Click on volumes under Elastic Block Store in EC2 dashboard
Create new EBS drive
Use already running instance or create new EC2 instance.
Again from EC2 dashboard navigate to volumes under Elastic Block Store. Select your volume that you want to attach and from action click attach and select your ec2 instance.
SSH into your EC2 instance
lsblk this will list all devices attached to your instance.
Try to identify new EBS volume name in the results
Check mountpoint column for that row and that should be empty and that's fine
sudo file -s /dev/xvdf replace xvdf with your volume this command will result in /dev/xvdf: data that means there is no file system associated with that drive. We have to format this newly created volume with some file system which is supported.
sudo mkfs -t ext4 /dev/xvdf this will format that newly created volume in ext4 file system.
Now we will create mount point where we will mount this new volume in our system. sudo mkdir /data and then sudo mount /dev/xvdf/ /data this will mount it to /data directory.
Make sure we have mounted successfully by lsblk
To mount this volume everytime we reboot run sudo cp /etc/fstab /etc/fstab.orig and then sudo nano /etc/fstab . Enter following statement at the end and save this file /dev/xvdf /data ext4 defaults,nofail 0 2
Check if everything is on track by sudo file -s /dev/xvdf and now you should see everything about this new volume.
Check if it is mounting on every reboot by cd / and sudo umount /data will unmount and then sudo mount -a will run the script to mount all volumes on reboot.
Check back by lsblk and everything should be mounted as expected.

This post is written based on AWS documentation and please make sure you read all types of services and charges associated with them. You will be charged if you use any service out of their free tier. I am not responsible for your any types of issues and charges. Please use this post on your own understanding.

RESTful API

sadasdkjoiwck — Sat, 15 Aug 2020 18:22:58 +0000

Some open RESTful APIs to get you started with excitement. I think there should be enough excitement when we start learning something new to keep up the spirit.

So if you're looking to learn what RESTful APIs are then first play with few open available RESTful APIs. Trust me it is really exciting to see how smooth it works.

I am using Visual Studio Code extension 'REST Client' to make these requests and see headers but there are many good alternative and you should check them too. If you like to do everything in terminal than curl is obvious choice. Postman is also good for interactive client application.

NASA APIs

NASA has https://api.nasa.gov/ API portal. Let's hear from them,

Welcome to the NASA API portal. The objective of this site is to make NASA data, including imagery, eminently accessible to application developers. The api.nasa.gov catalog is growing.

You will have to get the API key if you're developing any application but let's just use their endpoints which do not require and you can learn more on NASA's API portal but here I am just diving straight to working.

GET https://images-api.nasa.gov/search?description="Kalpana"&media_type=image

Read documentation for this endpoint here

Kalpana Chawla is my favorite Indian astronaut so I am requesting all data which has in description 'Kalpana' and media_type=image returns only those results which have images along with it. Exciting right.

GitHub APIs

Now let's do something more interesting. We all have github account and so you must be knowing that github also have jobs portal. Good news is they have few APIs public and you can interact with them.

GET https://jobs.github.com/positions.json?description=python&full_time=true&location=colorado

LaTeX documents

sadasdkjoiwck — Sat, 08 Aug 2020 00:43:56 +0000

We have been using word processor and many smart office systems that we starts thinking to response that yes I coded my resume.

Yes I created my resume in LaTeX programming and you should try it. The LaTeX project says that

'You get what you see'.

You can read more about LaTeX and it's working but here I am going to provide you cheat sheet which I prepared when I wrote my first LaTeX document.

LaTeX document structure

document class
use packages
definitions and macros
title page content
\begin document
...
...
\end document

and ignored extras

LaTeX command instructions

% for single line comment

\begin{document} . . . \end{document}

\documentclass[10pt,a4paper,twoside]{article}

\usepackage[property_name]{package name}

\author{hello_vatsal}

\title{intro}

\begin{itemize} . . . \end{itemize}

\begin{enumerate} . . . \end{enumerate}

\& for & \% for % for special characters use \ other examples are # { $ _ " '

\t{00} \AA \0e \day \pound \copyright \pi \Pi

\date{specify} example \date{\today} but remember that \maketitle is required to use command \today

Create your own environment commands by \begin {command} . . . \end {command}

To create new line break use \\

\section {give name}

\subsection {section name : number}

\subsection { : : }

\tableofcontents Make sure to use after maketitle command

\newpage

$...$ to insert inline formulas

$$...$$ to insert center justified formulas

\begin {array}

^ {} for super scripts

- {} for sub scripts

\begin {eqharray} enter equation here \end {eqharray}

\nonumbe use this in above statement to skip numbering of equation

\begin {figure}

\begin {minipage}

\input {path} to import files

\VSpace {-0.5cm}

\begin {aligh}

\begin {aligh*}

\begin {tabular} {# of col, alignment, vertical yes/no}

\hline

\cline {column start - column end}

\begin {table} this contains tabular as child element

\caption { }

\label { }

\textbf { } make bold face

\textit { } make italics

\textsc { } capitalize

\textsf { } distinguished

\textsl { } slant

\texttt { } typewrite fonts

\emph { } emphasize

\color {color name} first import color package

\tiny SIZE

\scriptsize SIZE

\footnotesize SIZE

\small SIZE

\normalsize SIZE

\large SIZE

\Large SIZE

\LARGE SIZE

\huge SIZE

\HUGE SIZE

I'm planning to make this cheat sheet more readable and organized so it is easier to understand. Please share your views in comment below.

PHP is still in the game

sadasdkjoiwck — Wed, 05 Aug 2020 04:51:31 +0000

We have so many options to choose from when it comes to choosing right technology stack for our application. There are even more frameworks and libraries supporting amazingly fast development. So you might be thinking that php is dead and it cannot compete with this fast development than hold on please.

There are many well known companies who are using php and its framework for tech stack. 9GAG & BBC still have php in their current tech stack.

Still people choose WordPress for to go solution for blog and simple websites. Taking about WordPress reminds me of famous tech blog Tech Crunch is still using WordPress.

Php have super powerful Laravel framework. And yes php also have package manager like npm which is composer.

If you or your server are looking for alternative of Laravel then my friends php has everything. My next php framework is CodeIgniter.

It is super easy to setup and I'll be writing one more DEV post on how to setup CodeIgniter in few simple steps.

Uninstall Anaconda from MacOS Catalina

sadasdkjoiwck — Fri, 31 Jul 2020 17:19:12 +0000

After I updated my MacOS to latest version when I tried to follow uninstall steps listed on official anaconda document it didn’t work. I had to look through couple of articles on internet and finally one which worked for me is I am documenting here so you don’t have to go through all the same steps again. Enjoy !

So when we upgrade our OS, zsh bash profile is not updated and so our conda commands don’t work. To solve this first we run following commands in terminal.

curl -L https://repo.anaconda.com/pkgs/misc/cpr-exec/cpr-0.1.1-osx-64.exe -o cpr && chmod +x cpr ./cpr rehome ~/anaconda3

source ~/anaconda3/bin/activate

conda init zsh

So above command will activate your virtual environment and there you can use your conda command in your terminal. So now just following steps mentioned in official anaconda documentation will be pretty straight but remember there’s one important step so keep following me.

Now official documentation ask you to install new package called anaconda-clean which will basically help you to take easy backup before you uninstall completely. So to do that run this command.

conda install anaconda-clean

Now to take backup just run that package which you just installed.

anaconda-clean —yes

You’ll notice one new directory created name .anaconda_backup

Now this is important step, you have to deactivate virtual environment before you delete anaconda directory so run following command.

conda deactivate

Now you can remove anaconda directory by following command.

rm -rf ~/anaconda3

Also you can choose to remove conda path from your bash profile so you’ll have fresh installation next time if you want. Run following command and put # to comment line or just delete what is mentioned next.

sudo nano ~/.bash_profile

#export PATH=“/Users/your_username/anaconda3/bin:$PATH”

DONE !! Congratulation you have completely uninstalled anaconda from your MacOS.

Setup Bitbucket for Mac OS

sadasdkjoiwck — Wed, 29 Jul 2020 01:22:19 +0000

Once you have created new repository on your bitbucket account and you're trying to clone project on local machine and you end up with error saying,

Please make sure you have the correct access rights and the repository exists. Permission denied (publickey). fatal: Could not read from remote repository.

We all hate errors

So follow these steps to get started quickly

Go to terminal
cd ~/.ssh/
ssh-keygen -C username@domain.com and hit return
Enter unique file name for that keypair
Now you should be able to check if it's successful or not by ls ~/.ssh/ , try to look for unique keypair name that you entered while creating
Now we don't want to enter password every time we're trying to access that keypair so add them into ssh agent by eval <acute-key> ssh-agent <acute-key>
ssh-add --apple-use-keychain ~/.ssh/<private_key_file>
Also we want to keep this change every time computer restarts to add it into ssh config file nano ~/.ssh/config then add following and exit

Host *
  UseKeychain yes

Now we have to add public key to our bitbucket account so first copy the public key with pbcopy < ~/.ssh/<unique-key>.pub So, for Mac OS users you have copied it into your clipboard.
Now add that into your bitbucket ssh key and hit save

Done !!
Happy Programing :)