Docker + Nginx getpwnam("www-data") problem how to solve?

Question

Nginx

In Dockerfile

#nginx
FROM nginx:alpine
RUN touch /var/run/nginx.pid && \
    chown -R www-data:www-data /var/run/nginx.pid && \
    chown -R www-data:www-data /var/cache/nginx
USER www-data
VOLUME /var/www
...

in nginx.conf

user www-data;
pid /var/run/nginx.pid;
...

In docker-compose.yml

...
  #Nginx Service
  nginx:
        image: nginx:alpine
        container_name: nginx
        restart: unless-stopped
        tty: true
        ports:
          - "80:80"
          - "443:443"
        volumes:
          - ./www:/var/www
          - ./nginx/:/etc/nginx/
          - ./log/nginx/:/var/log/nginx/
          - ./opt/:/opt/
        networks:
          - app-network
...

During startup in nginx logs:

2019/02/06 10:59:09 [emerg] 1#1: getpwnam("www-data") failed in /etc/nginx/nginx.conf:1

Exhausted... Help!

Answer 1

You don't have such a user - www-data. And the groups too. Add something like this to your Dockerfile:
RUN addgroup -g 1010 -S www-data && adduser -u 1010 -D -S -G www-data www-data

Answer 2

added, same problem

#nginx
FROM nginx:alpine
RUN addgroup -g 1010 -S www-data && \
    adduser -u 1010 -D -S -G www-data www-data && \
    touch /var/run/nginx.pid && \
    chown -R www-data:www-data /var/run/nginx.pid && \
    chown -R www-data:www-data /var/cache/nginx
USER www-data
VOLUME /var/www

2019/02/06 13:28:34 [emerg] 1#1: getpwnam("www-data") failed in /etc/nginx/nginx.conf:1