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Php versions – docker build fails with "permission denied" on `nginx -t`

I’m installing nginx on top of an fpm-stretch based php docker image, copy some configuration and then run nginx -t in the Dockerfile.
That one fails with nginx: [emerg] open() "/tmp/nginx.pid" failed (13: Permission denied).

The configuration contains pid /tmp/nginx.pid;.

The Dockerfile is:

FROM php:7.3.11-fpm-stretch
run apt-get update && apt-get install -y nginx nginx-extras
COPY .system_conf/nginx/nginx.conf /etc/nginx/nginx.conf
COPY .system_conf/nginx/real-ip.conf /etc/nginx/real-ip.conf
COPY .system_conf/nginx/app.conf /etc/nginx/sites-enabled/default
run touch /tmp/nginx.pid
run chown -R www-data:www-data /tmp/nginx.pid /etc/nginx /var/www /usr/local/etc/php-fpm*
run ls -la /tmp/nginx.pid
run whoami
run nginx -t

And the build output is:

Step 6/10 : run touch /tmp/nginx.pid
 ---> Running in b78b8c25da6e
Removing intermediate container b78b8c25da6e
 ---> 0ca504a62dcc
Step 7/10 : run chown -R www-data:www-data /tmp/nginx.pid /etc/nginx /var/www /usr/local/etc/php-fpm*
 ---> Running in 6d0e3e6e0085
Removing intermediate container 6d0e3e6e0085
 ---> 5801bebe1238
Step 8/10 : run ls -la /tmp/nginx.pid
 ---> Running in 3779596a2bf9
-rw-r--r-- 1 www-data www-data 0 Aug  5 13:19 /tmp/nginx.pid
Removing intermediate container 3779596a2bf9
 ---> fa5fb9b67a43
Step 9/10 : run whoami
 ---> Running in 3c501d3ef8d0
root
Removing intermediate container 3c501d3ef8d0
 ---> f4c8d7c894a3
Step 10/10 : run nginx -t
 ---> Running in 91687a1ea4d2
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: [emerg] open() "/tmp/nginx.pid" failed (13: Permission denied)
nginx: configuration file /etc/nginx/nginx.conf test failed

And here comes the really weird thing:
This happens on my colleagues computer. On my computer, everything works fine as expected.
We are both running ubuntu (me 18.04, he 20.04) and the same docker versions (19.03).

Update 1:
I do chmod 777 /tmp/nginx.pid in the Dockerfile and I get the same error.

Tags:

3

Answers


  1. Chosen as BEST ANSWER
    0

    I needed to add a user directive to the Dockerfile:

    FROM php:7.3.11-fpm-stretch
run apt-get update && apt-get install -y nginx nginx-extras
COPY .system_conf/nginx/nginx.conf /etc/nginx/nginx.conf
COPY .system_conf/nginx/real-ip.conf /etc/nginx/real-ip.conf
COPY .system_conf/nginx/app.conf /etc/nginx/sites-enabled/default
run touch /tmp/nginx.pid
run chown -R www-data:www-data /tmp/nginx.pid /etc/nginx /var/www /usr/local /etc/php-fpm*
run ls -la /tmp/nginx.pid
user www-data
run whoami
run nginx -t

    I still don't know why it would work on an ubuntu 18.04 but not on 20.04, though.


  2. 0

    You might need to grant permissions to the file nginx.pid.

    Try this:

    FROM php:7.3.11-fpm-stretch
RUN apt-get update && apt-get install -y nginx nginx-extras
COPY .system_conf/nginx/nginx.conf /etc/nginx/nginx.conf
COPY .system_conf/nginx/real-ip.conf /etc/nginx/real-ip.conf
COPY .system_conf/nginx/app.conf /etc/nginx/sites-enabled/default
RUN touch /tmp/nginx.pid
RUN chmod 755 /tmp/nginx.pid
RUN chown -R www-data:www-data /tmp/nginx.pid /etc/nginx /var/www /usr/local/etc/php-fpm*
RUN ls -la /tmp/nginx.pid
RUN whoami
RUN nginx -t
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  3. 0

    Two things to check:

    1. Pull the base image again, entirely possible they have done something to theirs: docker pull php:7.3.11-fpm-stretch

    2. Check for SELinux being enabled on the host or docker engine (docker info).

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