Passenger keeps looking for wrong ruby version - ruby-on-rails

Question

I upgrade my ruby version to 2.6.5. I deployed it to my server using capistrano.
But my nginx logs say this:
App 9470 output: /bin/sh: 1: exec: /home/deploy/.rvm/gems/ruby-2.3.1/wrappers/ruby: not found
[ E 2022-01-27 12:34:23.7336 9450/Tc age/Cor/App/Implementation.cpp:221 ]: Could not spawn process for application /home/deploy/taddar/current: The application process exited prematurely.
Error ID: d1f83ca0
Error details saved to: /tmp/passenger-error-0KwZUf.html
[ E 2022-01-27 12:34:23.7393 9450/T9 age/Cor/Con/CheckoutSession.cpp:276 ]: [Client 1-1] Cannot checkout session because a spawning error occurred. The identifier of the error is d1f83ca0. Please see earlier logs for details about the error.
When I run ruby -v I get 2.6.5, yet above you can see its looking for 2.3.1:
ruby -v
ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-linux]
Any ideas on how to fix this?
In my deploy.rb I set the ruby version.
set :rvm_ruby_version, '2.6.5'
My nginx.config looks like:
user www-data;
worker_processes auto;
pid /run/nginx.pid;
events {
worker_connections 768;
# multi_accept on;
}
http {
passenger_ruby /usr/bin/ruby2.6.5;
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
underscores_in_headers on;
# server_tokens off;
# server_names_hash_bucket_size 64;
# server_name_in_redirect off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# SSL Settings
##
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
gzip_disable "msie6";
gzip_vary on;
gzip_proxied any;
gzip_comp_level 6;
gzip_buffers 16 8k;
gzip_http_version 1.1;
gzip_min_length 256;
gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/vnd.ms-fontobject application/x-font-ttf font/opentype image/svg+xml image/x-icon;
##
# Phusion Passenger config
##
# Uncomment it if you installed passenger or passenger-enterprise
##
include /etc/nginx/passenger.conf;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}

Answer 1

Bingo got it working. Thanks to #razvans and #engineersmnky for pointing me in the right direction.
Yes I had references to passenger_ruby but it was in the wrong place. I had to go to /etc/nginx/sites-available and add passenger_ruby /path/to/ruby
To find out what the /path/to/ruby is use passenger-config about ruby-command and use the value at Command.
passenger-config about ruby-command
passenger-config was invoked through the following Ruby interpreter:
Command: /home/deploy/.rvm/gems/ruby-2.6.5/wrappers/ruby
So mine was
server {
....
passenger_ruby /home/deploy/.rvm/gems/ruby-2.6.5/wrappers/ruby
You might want to know any other references you have to ruby so they don't conflict with each other. A useful command is: grep -rnw 'path' -e 'passenger_ruby'
This doc helped me a lot https://www.phusionpassenger.com/library/deploy/nginx/deploy/ruby/#determine_ruby_command