How to install php7.4-fpm with Ubuntu

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Add php7.4 repository

sudo add-apt-repository ppa:ondrej/php
sudo apt-get update

Install php7.4-fpm

apt install php7.4-common php7.4-cli php7.4-zip php7.4-opcache php7.4-mysql php7.4-mbstring php7.4-json php7.4-intl php7.4-gd php7.4-fpm php7.4-curl php7.4-bz2 php7.4-bcmath php7.4-imap php7.4-recode php7.4-soap php7.4-xml php7.4-imagick php7.4-memcache php7.4-memcached php7.4-igbinary php7.4-msgpack php7.4-redis

Copy the php7.4-fpm pool configuration from php7.0-fpm

cp -f /etc/php/7.0/fpm/pool.d/www.conf /etc/php/7.4/fpm/pool.d/www.conf

Edit the listening port of php7.4-fpm (for example 9074 instead of 9070)

nano /etc/php/7.4/fpm/pool.d/www.conf

Replace the line listen = 127.0.0.1:9070 by listen = 127.0.0.1:9074
Restart the service

service php7.4-fpm restart

Then to use php7.4-fpm, you have the choice between

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1) Replace globally php7.0-fpm with php7.4-fpm

In this case just edit the file /etc/nginx/conf.d/upstream.conf and replace the line server 127.0.0.1:9070; by server 127.0.0.1:9074;

nano /etc/nginx/conf.d/upstream.conf

Then reload nginx

service nginx restart

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2) Add php7.4-fpm as an additional php version

Add the following lines in /etc/nginx/conf.d/upstream.conf

upstream php74 {
server 127.0.0.1:9074;
}

then copy the files /etc/nginx/common/php7.conf into /etc/nginx/common/php74.conf
And into this copy replace the line fastcgi_pass php7; by fastcgi_pass php74;

Reload nginx and you can replace the line include common/php7.conf; by include common/php74.conf; in the vhosts of your choice