Add worker_rlimit_nofile and worker_connections support to nginx config

README.md

@@ -499,6 +499,28 @@ ENV NGINX_WORKER_PROCESSES auto
 COPY ./app /app
 ```
 
+## Custom Nginx maximum connections per worker
+
+By default, Nginx will start with a maximum limit of 1024 connections per worker.
+
+If you want to set a different number you can use the environment variable `NGINX_WORKER_CONNECTIONS`, e.g:
+
+```Dockerfile
+ENV NGINX_WORKER_CONNECTIONS 2048
+```
+
+It cannot exceed the current limit on the maximum number of open files. See how to configure it in the next section.
+
+## Custom Nginx maximum open files
+
+The number connections per Nginx worker cannot exceed the limit on the maximum number of open files.
+
+You can change the limit of open files with the environment variable `NGINX_WORKER_OPEN_FILES`, e.g.:
+
+```Dockerfile
+ENV NGINX_WORKER_OPEN_FILES 2048
+```
+
 ## Customizing Nginx configurations
 
 If you need to configure Nginx further, you can add `*.conf` files to `/etc/nginx/conf.d/` in your Dockerfile.

python2.7-alpine3.7/entrypoint.sh

@@ -10,6 +10,17 @@ USE_NGINX_WORKER_PROCESSES=${NGINX_WORKER_PROCESSES:-1}
 # Modify the number of worker processes in Nginx config
 sed -i "/worker_processes\s/c\worker_processes ${USE_NGINX_WORKER_PROCESSES};" /etc/nginx/nginx.conf
 
+# Set the max number of connections per worker for Nginx, if requested
+# Cannot exceed worker_rlimit_nofile, see NGINX_WORKER_OPEN_FILES below
+if [[ -v NGINX_WORKER_CONNECTIONS ]] ; then
+    sed -i "/worker_connections\s/c\    worker_connections ${NGINX_WORKER_CONNECTIONS};" /etc/nginx/nginx.conf
+fi
+
+# Set the max number of open file descriptors for Nginx workers, if requested
+if [[ -v NGINX_WORKER_OPEN_FILES ]] ; then
+    echo "worker_rlimit_nofile ${NGINX_WORKER_OPEN_FILES};" >> /etc/nginx/nginx.conf
+fi
+
 # Get the URL for static files from the environment variable
 USE_STATIC_URL=${STATIC_URL:-'/static'}
 # Get the absolute path of the static files from the environment variable

python2.7/entrypoint.sh

@@ -10,6 +10,17 @@ USE_NGINX_WORKER_PROCESSES=${NGINX_WORKER_PROCESSES:-1}
 # Modify the number of worker processes in Nginx config
 sed -i "/worker_processes\s/c\worker_processes ${USE_NGINX_WORKER_PROCESSES};" /etc/nginx/nginx.conf
 
+# Set the max number of connections per worker for Nginx, if requested
+# Cannot exceed worker_rlimit_nofile, see NGINX_WORKER_OPEN_FILES below
+if [[ -v NGINX_WORKER_CONNECTIONS ]] ; then
+    sed -i "/worker_connections\s/c\    worker_connections ${NGINX_WORKER_CONNECTIONS};" /etc/nginx/nginx.conf
+fi
+
+# Set the max number of open file descriptors for Nginx workers, if requested
+if [[ -v NGINX_WORKER_OPEN_FILES ]] ; then
+    echo "worker_rlimit_nofile ${NGINX_WORKER_OPEN_FILES};" >> /etc/nginx/nginx.conf
+fi
+
 # Get the URL for static files from the environment variable
 USE_STATIC_URL=${STATIC_URL:-'/static'}
 # Get the absolute path of the static files from the environment variable

python3.5/entrypoint.sh

@@ -10,6 +10,17 @@ USE_NGINX_WORKER_PROCESSES=${NGINX_WORKER_PROCESSES:-1}
 # Modify the number of worker processes in Nginx config
 sed -i "/worker_processes\s/c\worker_processes ${USE_NGINX_WORKER_PROCESSES};" /etc/nginx/nginx.conf
 
+# Set the max number of connections per worker for Nginx, if requested
+# Cannot exceed worker_rlimit_nofile, see NGINX_WORKER_OPEN_FILES below
+if [[ -v NGINX_WORKER_CONNECTIONS ]] ; then
+    sed -i "/worker_connections\s/c\    worker_connections ${NGINX_WORKER_CONNECTIONS};" /etc/nginx/nginx.conf
+fi
+
+# Set the max number of open file descriptors for Nginx workers, if requested
+if [[ -v NGINX_WORKER_OPEN_FILES ]] ; then
+    echo "worker_rlimit_nofile ${NGINX_WORKER_OPEN_FILES};" >> /etc/nginx/nginx.conf
+fi
+
 # Get the URL for static files from the environment variable
 USE_STATIC_URL=${STATIC_URL:-'/static'}
 # Get the absolute path of the static files from the environment variable

python3.6-alpine3.7/entrypoint.sh

@@ -10,6 +10,17 @@ USE_NGINX_WORKER_PROCESSES=${NGINX_WORKER_PROCESSES:-1}
 # Modify the number of worker processes in Nginx config
 sed -i "/worker_processes\s/c\worker_processes ${USE_NGINX_WORKER_PROCESSES};" /etc/nginx/nginx.conf
 
+# Set the max number of connections per worker for Nginx, if requested
+# Cannot exceed worker_rlimit_nofile, see NGINX_WORKER_OPEN_FILES below
+if [[ -v NGINX_WORKER_CONNECTIONS ]] ; then
+    sed -i "/worker_connections\s/c\    worker_connections ${NGINX_WORKER_CONNECTIONS};" /etc/nginx/nginx.conf
+fi
+
+# Set the max number of open file descriptors for Nginx workers, if requested
+if [[ -v NGINX_WORKER_OPEN_FILES ]] ; then
+    echo "worker_rlimit_nofile ${NGINX_WORKER_OPEN_FILES};" >> /etc/nginx/nginx.conf
+fi
+
 # Get the URL for static files from the environment variable
 USE_STATIC_URL=${STATIC_URL:-'/static'}
 # Get the absolute path of the static files from the environment variable

python3.6/entrypoint.sh

@@ -10,6 +10,17 @@ USE_NGINX_WORKER_PROCESSES=${NGINX_WORKER_PROCESSES:-1}
 # Modify the number of worker processes in Nginx config
 sed -i "/worker_processes\s/c\worker_processes ${USE_NGINX_WORKER_PROCESSES};" /etc/nginx/nginx.conf
 
+# Set the max number of connections per worker for Nginx, if requested
+# Cannot exceed worker_rlimit_nofile, see NGINX_WORKER_OPEN_FILES below
+if [[ -v NGINX_WORKER_CONNECTIONS ]] ; then
+    sed -i "/worker_connections\s/c\    worker_connections ${NGINX_WORKER_CONNECTIONS};" /etc/nginx/nginx.conf
+fi
+
+# Set the max number of open file descriptors for Nginx workers, if requested
+if [[ -v NGINX_WORKER_OPEN_FILES ]] ; then
+    echo "worker_rlimit_nofile ${NGINX_WORKER_OPEN_FILES};" >> /etc/nginx/nginx.conf
+fi
+
 # Get the URL for static files from the environment variable
 USE_STATIC_URL=${STATIC_URL:-'/static'}
 # Get the absolute path of the static files from the environment variable