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503 Service Unavailable : PHP-FPM issue

Error: 503 Service Unavailable The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

Solution: 

systemctl start php80-php-fpm (if face the error follow the next command )

systemctl status php80-php-fpm.service

ERROR: unable to bind listening socket for address '127.0.0.1:9000': Address already in use (98)

netstat -tulpn | grep -w 9000 

tcp        0      0 127.0.0.1:9000          0.0.0.0:*               LISTEN      884/php-fpm: master 

kill 884

systemctl start php80-php-fpm

Note: Use your PHP version, PID and Port in the command. if netstat not works install net-tools first: yum install net-tools

How to Extend Swap Space using Swap file in Linux

dd if=/dev/zero of=/swap_file bs=1G count=1

sudo fallocate -l 1G /swap_file

chmod 600 /swap_file

mkswap /swap_file

echo "swap_file swap swap defaults 0 0" >> /etc/fstab 

or 

vi /etc/fstab/swap_file swap swap defaults 0 0

swapon /swap_file

Two-Factor Authentication (2FA) for Webmin with Google Authenticator

First install Perl Modules :

https://blog.olineit.com/2022/09/install-perl-cpan-module-in-centos-8.html

Then follow the instructions as given through the URL:

https://devtutorial.io/how-to-install-two-factor-authentication-2fa-for-webmin-p2845.html

Install only Webmin in CentOS

sudo vi /etc/yum.repos.d/webmin.repo

[Webmin]
name=Webmin Distribution Neutral
#baseurl=http://download.webmin.com/download/yum
mirrorlist=http://download.webmin.com/download/yum/mirrorlist
enabled=1




wget http://www.webmin.com/jcameron-key.asc

sudo rpm --import jcameron-key.asc

sudo yum install webmin

Follow the command to instll Virtualmin:

~# wget https://software.virtualmin.com/gpl/scripts/virtualmin-install.sh

~# sudo sh virtualmin-install.sh

Install only Webmin without Lamp Stack

$ sudo nano /etc/apt/sources.list

$ deb http://download.webmin.com/download/repository sarge contrib

$ wget http://www.webmin.com/jcameron-key.asc 

$ sudo apt-key add jcameron-key.asc

$ sudo apt update 

$ sudo apt install webmin

How to retry delivery of Postfix mail in queue?

 postsuper -r ALL && postqueue -f

Install Webmin on Ubuntu 20.04

sudo apt update

sudo apt install wget apt-transport-https software-properties-common

wget -q http://www.webmin.com/jcameron-key.asc -O- | sudo apt-key add -

sudo add-apt-repository "deb [arch=amd64] http://download.webmin.com/download/repository sarge contrib"

sudo apt install webmin

sudo systemctl status webmin

sudo ufw allow 10000/tcp

sudo ufw reload

https://server-ip:10000/

Install extensions for PHP 7.4 on Ubuntu 20

sudo apt-get install php7.4-cli php7.4-fpm php7.4-bcmath php7.4-curl php7.4-gd php7.4-intl php7.4-json php7.4-mbstring php7.4-mysql php7.4-opcache php7.4-sqlite3 php7.4-xml php7.4-zip

or 

sudo apt update

sudo apt install php7.4

sudo apt install php7.4-common php7.4-mysql php7.4-xml php7.4-xmlrpc php7.4-curl php7.4-gd php7.4-imagick php7.4-cli php7.4-dev php7.4-imap php7.4-mbstring php7.4-opcache php7.4-soap php7.4-zip php7.4-intl -y

How to Download and Install Virtualmin || Ubuntu 20.04

The easiest way to get the install script onto your server, is to login to your server and use wget or curl. For example:


# wget http://software.virtualmin.com/gpl/scripts/install.sh

For Virtualmin Professional, use the command suggested on your Software Licenses page.


Run the Install Script and Configure Virtualmin

Execute the downloaded install script using a command like the following:

sudo /bin/sh install.sh

PHP files prompts downloaded instead of executed in FCGId URL

In "/etc/apache2/mods-enabled/php.conf" (replace php with your filename, depending on the php version you're using - in my case it was php7.2.conf) comment out the following two lines:

SetHandler application/x-httpd-php

SetHandler application/x-httpd-php-source

Restart the apache server via the following command:

sudo service apache2 restart

Now set your webstite to FCGId (Virtualmin -> Server Configuration -> Website options -> PHP script execution mode ) and it should work properly.