Railway•9mo ago

Dockerfile build doesn't get PORT arg (railway CLI)

My Dockerfile build doesn't get the alleged PORT arg with railway's randomly generated port (i.e. --build-arg="PORT=7545"). I'm deploying with the railway CLI. Project ID: 988c3d59-aff4-487b-8d86-5541ba84fcad Service ID: b53149d1-7adc-4868-862b-46cedbed17bf Dockerfile:

FROM php:8.2-apache

ARG PORT

RUN echo PORT value: $PORT
CMD echo PORT value: $PORT

FROM php:8.2-apache

ARG PORT

RUN echo PORT value: $PORT
CMD echo PORT value: $PORT

Deploy command:

wsl -u root railway up

wsl -u root railway up

7 Replies

Percy•9mo ago

Project ID: 988c3d59-aff4-487b-8d86-5541ba84fcad,b53149d1-7adc-4868-862b-46cedbed17bf

Brody•9mo ago

the generated port is only available at run time, there should be no need to use it during build if your app cant listen on the PORT environment variable during runtime, then just set a PORT service variable to the same port that your app does listen on

joe•9mo ago

ok, in a different service (ID: 108e166f-6409-417f-ab3a-fbf9884561f0), I tried setting PORT=8080 in my service variables and the port was accessible in both build and deployment, so my app should be listening on 8080, but I'm getting 503, "Application failed to respond" when I visit the public URL (https://grandiose-friction-production.up.railway.app/) Here's the Dockerfile. It works perfectly on my local machine:

FROM php:8.2-apache

ARG PORT
ENV PORT=$PORT

COPY ./src/ /var/www/html/

# Change the port numbers in apache's config files...

# Comment out all ports that are not in an IfModule block
RUN sed -i '/<IfModule/,/<\/IfModule>/! s/^\(Listen [0-9]*\)/# Disabled in image build step:\n# \1/' /etc/apache2/ports.conf
# Add correct port to end of file
RUN echo "Listen ${PORT}" >> /etc/apache2/ports.conf

# Output file contents for debugging
RUN cat /etc/apache2/ports.conf

# Duplicate the first occurrence of a VirtualHost opening tag and comment out the duplicate
RUN sed -i '/<VirtualHost/{p;h;s/^/# Disabled in image build step:\n# /g}' /etc/apache2/sites-available/000-default.conf
# Change the original with the correct port
RUN sed -E -i "0,/VirtualHost \*:[0-9]+/s//VirtualHost *:${PORT}/" /etc/apache2/sites-available/000-default.conf

# Output file contents for debugging
RUN cat /etc/apache2/sites-available/000-default.conf

RUN echo PORT value: $PORT
CMD echo PORT value: $PORT

EXPOSE $PORT

FROM php:8.2-apache

ARG PORT
ENV PORT=$PORT

COPY ./src/ /var/www/html/

# Change the port numbers in apache's config files...

# Comment out all ports that are not in an IfModule block
RUN sed -i '/<IfModule/,/<\/IfModule>/! s/^\(Listen [0-9]*\)/# Disabled in image build step:\n# \1/' /etc/apache2/ports.conf
# Add correct port to end of file
RUN echo "Listen ${PORT}" >> /etc/apache2/ports.conf

# Output file contents for debugging
RUN cat /etc/apache2/ports.conf

# Duplicate the first occurrence of a VirtualHost opening tag and comment out the duplicate
RUN sed -i '/<VirtualHost/{p;h;s/^/# Disabled in image build step:\n# /g}' /etc/apache2/sites-available/000-default.conf
# Change the original with the correct port
RUN sed -E -i "0,/VirtualHost \*:[0-9]+/s//VirtualHost *:${PORT}/" /etc/apache2/sites-available/000-default.conf

# Output file contents for debugging
RUN cat /etc/apache2/sites-available/000-default.conf

RUN echo PORT value: $PORT
CMD echo PORT value: $PORT

EXPOSE $PORT

I checked both apache config files locally and on railway. They have the correct contents

Brody•9mo ago

right, as I said the auto generated PORT isn't available during build, but a manually set one would be make sure you are also listening on host 0.0.0.0 as well

joe•9mo ago

For future readers, I had to specify 0.0.0.0 in the Listen and VirtualHost directives, like this... Listen 0.0.0.0${PORT} <VirtualHost 0.0.0.0${PORT}> @Brody did you mark this as solved yourself? It's only been one day I was going to mark my message as the solution for future reference

Brody•9mo ago

#🛂｜readme #5 i was confident in what i said being the general solution, so yes i did give this thread a solved tag

joe•9mo ago

huh, ok

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Dockerfile build doesn't get PORT arg (railway CLI)