Installing Passenger
on Ubuntu 20.04 LTS (with APT)

Relevant selection for this article:

Step 1: install Passenger packages

These commands will install Passenger + Apache module through Phusion's APT repository.

sudo apt-get install apache2

# Install our PGP key and add HTTPS support for APT
sudo apt-get install -y dirmngr gnupg apt-transport-https ca-certificates 

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 561F9B9CAC40B2F7

# Add our APT repository
sudo sh -c 'echo deb https://oss-binaries.phusionpassenger.com/apt/passenger focal main > /etc/apt/sources.list.d/passenger.list'
sudo apt-get update

# Install Passenger + Apache module
sudo apt-get install -y libapache2-mod-passenger

Step 2: enable the Passenger Apache module and restart Apache

$ sudo a2enmod passenger
$ sudo apache2ctl restart

Step 3: check installation

After installation, please validate the install by running sudo /usr/bin/passenger-config validate-install. For example:

$ sudo /usr/bin/passenger-config validate-install
 * Checking whether this Phusion Passenger install is in PATH... ✓
 * Checking whether there are no other Phusion Passenger installations... ✓

All checks should pass. If any of the checks do not pass, please follow the suggestions on screen.

Finally, check whether Apache has started the Passenger core processes. Run sudo /usr/sbin/passenger-memory-stats. You should see Apache processes as well as Passenger processes. For example:

$ sudo /usr/sbin/passenger-memory-stats
Version: 5.0.8
Date   : 2015-05-28 08:46:20 +0200

---------- Apache processes ----------
PID    PPID   VMSize    Private  Name
--------------------------------------
3918   1      190.1 MB  0.1 MB   /usr/sbin/apache2
...

----- Passenger processes ------
PID    VMSize    Private   Name
--------------------------------
12517  83.2 MB   0.6 MB    Passenger watchdog
12520  266.0 MB  3.4 MB    Passenger core
12531  149.5 MB  1.4 MB    Passenger ust-router
...

If you do not see any Apache processes or Passenger processes, then you probably have some kind of installation problem or configuration problem. Please refer to the troubleshooting guide.

Step 4: update regularly

apache updates, Passenger updates and system updates are delivered through the APT package manager regularly. You should run the following command regularly to keep them up to date:

$ sudo apt-get update
$ sudo apt-get upgrade

You do not need to restart apache or Passenger after an update, and you also do not need to modify any configuration files after an update. That is all taken care of automatically for you by APT.