Note, selecting 'cmdtest' instead of 'yarn'

This is because there is a different yarn that is part on cmdtest package and is older than the yarn you are trying to install.

Solving this very simple. Instead of installing via apt or apt-get install it via npm

sudo npm install -g yarn

You can now check the version of yarn with this command

yarn -v

That’s it.

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There are multiple ways to install WSL. You can directly download an Linux distribution from windows store and it will install WSL2 and your chosen Linux distribution.

The way recommended by Microsoft is by using command line. In this tutorial we will install WSL using command prompt.

Step 1: Open command prompt

Type command prompt in the search box on the taskbar. If you do not have a search box then you can click on the search icon and start typing. If you do not have that too. You can click on the windows button and start typing command prompt to search for it.

Once you find the command prompt right click on it and click on the run as administrator on the popup menu.

Step 2: Install WSL2

Run following command in the command prompt window to install WSL2. This command will also install ubuntu which is the default Linux distro for WSL. You can always install other distros afterward.

wsl --install

Windows will start downloading and installing the WSL2 and then Ubuntu to set up the Linux environment.

Step 3: Set up UNIX user and password

After the installation it will ask for a Unix username. You can choose any username it does not have to be same as windows username. Type your username and press enter.

After the username it will ask for password. Type a password of your choice for this user and press enter.

If everything goes well WSL2 and ubuntu will be successfully installed on your system.

You can verify WSL by using this command

wsl --status 

This is will you a screen like the pic below.

I you face any problem please comment below.

The post How to Install WSL2 on Windows appeared first on Installing.in.

I searched through the web but nothing was working. So I decided to go through the server log. I know I should have done this first.

I found these lines in the syslog file:

The issue was in iptables and I needed to flush it

I ran the command highlighted in the the image above

/usr/sbin/netfilter-persistent flush 

It gave following output

I tried to to connect to the port 80 and the default nginx page loaded in browser.

Problem solved.

But doing this messed up my OpenVPN server. OpenVPN client was connecting but internet was not accessible.

So I rebooted the system to see if it fixes the problem.

It did fixed OpenVPN.

But again port 80 was inaccessible.

I checked the status of ufw and it was disable. I had enabled it before I rebooted. Iptable rules were all reset. I googled why ufw was disabled and found iptables-persistent conflicts with ufw.

I disabled iptables-persistent using this command

sudo systemctl disable netfilter-persistent

I rebooted the system again and this time ufw stayed enabled and I was able to access the port 80 and also OpenVPN was working as intended.

The post [Solved] Ubuntu refusing connection on port 80 appeared first on Installing.in.

This can be quickly fixed in 2 steps:

1. Adding the ubuntu user to the www-data group
2. Giving write permission to everyone in this group

Adding the user:

Run this command to add the ubuntu user to the www-data group

sudo addgroup ubuntu www-data

You have to logout and login back again for changes to take effect.

Give the write permission:

Assuming your web directory is /var/www we run following command to give everyone in the www-data group write permission to this directory

sudo chmod g+w /var/www -R

Try editing or creating new file in /var/www directory to verify

The post How to give ubuntu user permission to write to www directory appeared first on Installing.in.

sudo yum install htop

and getting this error

Error: Unable to find a match: htop

This is because the correct repository is not added to your system.

htop is part of EPEL release so you will need to enable it.

To fix this follow these simple 2 steps:

Step 1: Add EPEL repository

sudo yum install epel-release

Press ‘y’ key and then enter when asked

You will see a screen like this

Step 2: Install htop

Run the command to install htop

sudo yum install htop

This will first update the index and then download and install htop.

If everything goes well you will have a working htop.

You can run htop by using the command

htop

you will see something like this

If you face any problem let me know in the comment below.

The post [Solved] Error: Unable to find a match: htop CentOS 8 appeared first on Installing.in.

For installing Openresty on Debian 10 follow these simple steps

Step 1: (Optional) Stop Nginx 

This step is only required if you are already running Nginx on your system. Without stopping Nginx installation of openresty might fail.

Run these commands to stop and disable Nginx

sudo systemctl disable nginx
sudo systemctl stop nginx

Step 2: Import GPG key

Run these commands to import the GPG key

sudo apt-get -y install --no-install-recommends wget gnupg ca-certificates

Above command will install some dependencies to import the key

wget -O - https://openresty.org/package/pubkey.gpg | sudo apt-key add -

This command will import the GPG key into your system

Step 3: Add Openresty repository

First, get the version of the Debian OS of your system. This command will get the version codename and save it to variable “codename”. We will use this variable in next command to add the appropriate repository for your system.

codename=`grep -Po 'VERSION="[0-9]+ \(\K[^)]+' /etc/os-release`

Now add the openresty repository for your version

echo "deb http://openresty.org/package/debian $codename openresty" \ | sudo tee /etc/apt/sources.list.d/openresty.list

Step 4: Update apt index

Use this command to update the apt index so we can download the latest package from the repository

sudo apt-get update

Step 5: Install Openresty

Now download and install the Openresty package from the repository by using this command

sudo apt-get -y install openresty

If everything goes well you will have openresty installed on your system.

You can visit the IP Address of your server to verify openresty is running. You will be greeted with a screen like this

That’s it

If you face any problem let me know in the comments below so we can solve the problem together.

The post How to Install Openresty on Debian 10 appeared first on Installing.in.

Nodejs can be installed directly from Ubuntu’s repository or can be installed from the Nodesource repository. As mentioned above it is developing very fast it is advisable to install it from the Nodesource repository as it contains all the latest updates.

We will be using the Nodesource repository to install Nodejs in this guide. Also, we will be installing the LTS version of nodejs which is 12.x currently. If you want to install the latest version you can check here for the versions available.

Let’s start installing Nodejs

Step 1: Update your OS:

Doing this is a good practice before installing any new package. Use these commands to update your system

sudo apt update

sudo apt upgrade

Step 2: Add Nodesource Repository

Good people at Nodesource have written this bash script that makes sit easier to add the repository. Download and run the script by using this command

curl -sL https://deb.nodesource.com/setup_lts.x | sudo -E bash -

If you are installing any other version change the text marked in red with the version number in the above command.

Step 3: Install Nodejs and npm 

Use the command below to install the nodejs package. It will also install the npm package that will help you download the nodejs libraries later on.

sudo apt-get install -y nodejs

Step 4: Verify installation

If everything goes well you will have Nodejs and npm installed on your system.

To check use following commands to verify the version of both npm and nodejs installed on your system.

For nodejs:

node -v

For npm

npm -v

If everything has gone well you will see something like this

If you face any problem let me know in the comments below so we can fix the problem together.

The post How to Install Nodejs on Ubuntu 20.04 appeared first on Installing.in.

Many people prefer it to a bash shell as it is faster to use and way more configurable according to the user.

To know more about zsh you can read their FAQ here.

Installing zsh in Ubuntu is pretty straight forward.

Step 1: Update the apt index

We need to update the apt index so we can get the latest binaries available. Use the following command to update the apt index

sudo apt update

Step 2: Install zsh

Use this command to download and install the latest zsh from the ubuntu repository.

sudo apt install zsh

If everything goes well you will have zsh installed

Check it by switching to zsh by typing

zsh

If zsh is installed correctly you will see zsh prompt instead of normal bash one. If its first time you are logging to zsh it will show you a few options. Choose one which is right for you.

To go back to the bash shell type

bash

you will switch to the regular bash shell again.

If you face any problem let me know in the comments section below.

The post How to install zsh on Ubuntu 20.04 appeared first on Installing.in.

Most used feature of Openresty is the the built in Lua plugin that helps in writing Lua web app directly inside the web server without any need on installing other software. As Lua is built into the web server it makes it faster.

You can always download the source and compile it yourself but that is cumbersome and makes updating Openresty later on difficult.

For this guide, I will be using the prebuilt binaries provided by the Openresty repository.

Lets get Started

Step 1 : Import GPG Key:

GPG key helps in verifying the authenticity of the package. Run following command to get the GPG key from the official Openresty server and add in to your server.

wget -qO - https://openresty.org/package/pubkey.gpg | sudo apt-key add -

Step 2 : Add Openresty repository:

We need to be sure that ‘apt-add-repository’ command is available in our server. Run below command and it will install the required packages if not available.

sudo apt-get -y install software-properties-common

Now to add the repository use below command. It will detect the version of Ubuntu running on your server and add the appropriate repository.

sudo add-apt-repository -y "deb http://openresty.org/package/ubuntu $(lsb_release -sc) main"

Step 3 : Install Openresty

Update the apt index first

sudo apt-get update

Now run below command to download and install Openresty web server

sudo apt-get install openresty

If no error occurs you will have Openresty web server successfully installed and running on your server.

Visit your server’s IP address and you will be presented with a page like this

If you face any problem please comment below and we will try to solve it together.

The post How to install Openresty on Ubuntu 20.04 appeared first on Installing.in.

We can install it easily by adding the percona’s repository to ubuntu or by downloading the source and compiling it ourselves. For this guide, I will be using the first method because that makes upgrading very easy later on.

For this guide, I will be using a freshly created 1GB VPS from Vultr hosted in Singapore.

After logging into the server via SSH go through these steps using sudo if you are not logged in as root.

Step 1: Add Percona’s repository:

To add their repository percona has created a .deb file that we need to download and install. Let’s start by downloading the package with this command:

wget https://repo.percona.com/apt/percona-release_latest.$(lsb_release -sc)_all.deb

Now install this package with this command:

dpkg -i percona-release_latest.$(lsb_release -sc)_all.deb

This will add the repository and other requirements.

Step 2: Enable the repository:

We need to enable this freshly added repository. To do so run this command:

percona-release enable psmdb-42 release

4.2 is the latest version at the time of writing and we are enabling repository for this version by the above command.

Step 3: Install Percona MongoDB

Update the local package information first

apt update

Now run this to install

apt install percona-server-mongodb

This will install the percona mongodb on your server and start it.

Check the status of mongodb by running this command:

service mongod status

You will see something like this

If the server is not running you can use this command to start

service mongod start

To stop the server you can use

service mongod stop

and to restart mongodb server

service mongod restart

If you need to change the configuration MongoDB configuration file is located at /etc/mongod.conf

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