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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

Reinstall MySQL in virtualmin

sudo apt purge mysql-server mysql-client mysql-common
sudo apt autoremove

sudo mv -iv /var/lib/mysql /var/tmp/mysql-backup

sudo rm -rf /var/lib/mysql*

Then goto webmin dashboard>Server>MySQL Database Server>Install

Install multiple PHP version on Ubuntu for Virtualmin

 Enable ondrej/php repository

LC_ALL=C.UTF-8 add-apt-repository -y ppa:ondrej/php && apt-get update

Install additional PHP packages

apt-get install php*-{cgi,cli,fpm,pdo,gd,mbstring,mysqlnd,opcache,xml,zip} 

Note: php* should be replaced with a specific PHP version, i.e. php7.4, unless you really need to install all available additional PHP versions.

Configuring the second PHP Version in Virtualmin

Once you have completed the installation of a second PHP version on your server, you can verify that Virtualmin sees it by logging into Virtualmin, and clicking System Settings → Re-Check Config. You should see something like this:

The following PHP execution modes are available : fpm
The following PHP-FPM versions are available : 8.0.13 (php-fpm) 7.4.30 (php74-php-fpm) 8.2.0 (php82-php-fpm) 

You can configure which one is the default PHP version used on new Virtual Servers. The default is to use the newest available. You can change that default in System Settings → Server Templates → Default → PHP Options page.

Configuring Individual Virtual Servers

You can configure the PHP version being used for a specific Virtual Server by selecting Server Configuration → PHP Options.

Source: https://www.virtualmin.com/documentation/web/multiplephp/

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

How to retry delivery of Postfix mail in queue?

 postsuper -r ALL && postqueue -f

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

Install and enable CURL extention for PHP 7.4 on Ubuntu 20.04

apt-get install php7.4-gd

apt-get install php7.4-curl

/etc/init.d/apache2 restart

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.