[emerg] 1#1: host not found in upstream "php-fpm:9000" in /etc/nginx/conf.d/upstream.conf:1

RUN echo "upstream php-upstream { server ${PHP_UPSTREAM_CONTAINER}:${PHP_UPSTREAM_PORT}; }" > /etc/nginx/conf.d/upstream.conf
&& rm /etc/nginx/conf.d/default.conf

location ~ .php$ {
      ...
      fastcgi_pass php-upstream;
      ...
    }

resolver 127.0.0.11;
    set $upstream php-fpm:9000;
    # nginx will now start if host is not reachable
    fastcgi_pass    $upstream;