use a non root user to start nginx

Dockerfile.production

@@ -1,23 +1,46 @@
-From debian:buster-slim
+# https://github.com/nginxinc/docker-nginx-unprivileged/blob/master/stable/buster/Dockerfile
-WORKDIR /var/www/mat2-web
-COPY . /var/www/mat2-web
-RUN apt-get update \
-&&  apt-get install --no-install-recommends --no-install-suggests --yes \
-    systemd \
-    mat2 \
-    uwsgi \
-    uwsgi-plugin-python3 \
-    nginx-light \
-    python3-pip \
-    python3-setuptools \
-    python3-wheel \
-&&  rm -rf /var/cache/apt/* /var/lib/apt/lists/* \
-&&  pip3 install -r requirements.txt \
-&&  mkdir ./uploads \
-&&  chown -R www-data:www-data . \
-&&  cp ./config/uwsgi.config /etc/uwsgi/apps-enabled/mat2-web.ini \
-&&  rm /etc/nginx/sites-enabled/default \
-&&  mkdir -p /etc/nginx/sites-enabled/ \
-&&  cp ./config/nginx.config /etc/nginx/sites-enabled/mat2.conf
 
-CMD ["sh", "-c", "/etc/init.d/nginx restart; uwsgi --ini /etc/uwsgi/apps-enabled/mat2-web.ini"]
+From debian:buster-slim
+
+LABEL maintainer="Mat-Web Maintainer <jan.friedli@immerda.ch>"
+
+WORKDIR /var/www/mat2-web
+
+COPY . /var/www/mat2-web
+
+RUN set -x \
+    && addgroup --system --gid 101 nginx \
+    && adduser --system --disabled-login --ingroup nginx --no-create-home --home /nonexistent --gecos "nginx user" --shell /bin/false --uid 101 nginx \
+    && apt-get update \
+    && apt-get install --no-install-recommends --no-install-suggests -y \
+        gnupg1  \
+        ca-certificates \
+        nginx \
+        gettext-base \
+        systemd \
+        mat2 \
+        uwsgi \
+        uwsgi-plugin-python3 \
+        python3-pip \
+        python3-setuptools \
+        python3-wheel \
+    && pip3 install -r requirements.txt \
+    && rm /etc/nginx/sites-enabled/default /etc/nginx/nginx.conf \
+    && cp ./config/nginx-default.conf /etc/nginx/sites-enabled/default \
+    && cp ./config/nginx.conf /etc/nginx/nginx.conf \
+    && cp ./config/uwsgi.config /etc/uwsgi/apps-enabled/mat2-web.ini \
+    && chown 101:101 /etc/uwsgi/apps-enabled/mat2-web.ini \
+    &&  mkdir -p /var/cache/nginx \
+    && chown -R 101:0 /var/cache/nginx \
+    && chmod -R g+w /var/cache/nginx \
+    && ln -sf /dev/stdout /var/log/nginx/access.log \
+    && ln -sf /dev/stderr /var/log/nginx/error.log \
+    && rm -rf /var/cache/apt/* /var/lib/apt/lists/* \
+    &&  mkdir ./uploads \
+    &&  chown -R nginx:nginx .
+
+STOPSIGNAL SIGTERM
+
+USER 101
+
+CMD ["sh", "-c", "nginx; uwsgi --ini /etc/uwsgi/apps-enabled/mat2-web.ini;"]

config/nginx-default.conf

@@ -1,7 +1,7 @@
 server {
 	server_name _;
-	listen 80 default_server;
+	listen 8080 default_server;
-	listen [::]:80 default_server;
+	listen [::]:8080 default_server;
 	client_max_body_size 20M;
 
 	root /var/www/mat2-web;

config/nginx.conf

@@ -0,0 +1,69 @@
+user nginx;
+worker_processes auto;
+pid /tmp/nginx.pid;
+include /etc/nginx/modules-enabled/*.conf;
+
+events {
+        worker_connections 768;
+        # multi_accept on;
+}
+
+http {
+
+        ##
+        # Basic Settings
+        ##
+
+        sendfile on;
+        tcp_nopush on;
+        tcp_nodelay on;
+        keepalive_timeout 65;
+        types_hash_max_size 2048;
+        # 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; # 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_vary on;
+        # gzip_proxied any;
+        # gzip_comp_level 6;
+        # gzip_buffers 16 8k;
+        # gzip_http_version 1.1;
+        # gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
+
+        ##
+        # Virtual Host Configs
+        ##
+
+        include /etc/nginx/conf.d/*.conf;
+        include /etc/nginx/sites-enabled/*;
+
+				proxy_temp_path /tmp/proxy_temp;
+				client_body_temp_path /tmp/client_temp;
+				fastcgi_temp_path /tmp/fastcgi_temp;
+				uwsgi_temp_path /tmp/uwsgi_temp;
+				scgi_temp_path /tmp/scgi_temp;
+}