Allow for low memory configurations < 2GB RAM so can be used on EC2 Free Tier

[tecfu]

Problem

nginx is requesting to allocate more than the maximum shared memory configured for the system.
This image uses a default shared memory allocation that is too high for my machine (an Amazon EC2 t2.micro instance).

Here is the error:

nginx: [alert] mmap(MAP_ANON|MAP_SHARED, 2147483648) failed (12: Out of memory)

From what I can tell this mean that the NGINX needs 2147483648 bytes or 2 GB of shared memory available.

[tecfu]

This won't work on an EC2 t2.micro (1GB RAM) or t2.small (2 GB RAM)

[fsouza]

@tecfu can you share your nginx.conf?

[tecfu]

I'm using the stock nginx.conf file that comes with the container.

worker_processes  auto;

events {
  use epoll;
}

http {
  log_format  main  '$remote_addr $remote_user [$time_local] "$request" '
    '$status "$http_referer" "$http_user_agent"';

  access_log  /dev/stdout  main;
  error_log   stderr debug;

  default_type  application/octet-stream;
  include       /usr/local/nginx/conf/mime.types;

  sendfile    on;
  tcp_nopush  on;
  tcp_nodelay on;

  vod_mode                           local;
  vod_metadata_cache                 metadata_cache 16m;
  vod_response_cache                 response_cache 2048m;
  vod_last_modified_types            *;
  vod_segment_duration               9000;
  vod_align_segments_to_key_frames   on;
  vod_dash_fragment_file_name_prefix "segment";
  vod_hls_segment_file_name_prefix   "segment";

  vod_manifest_segment_durations_mode accurate;

  open_file_cache          max=1000 inactive=5m;
  open_file_cache_valid    2m;
  open_file_cache_min_uses 1;
  open_file_cache_errors   on;

  aio on;

  server {
    listen 80;
    server_name localhost;
    root /opt/static;

    location ~ ^/videos/.+$ {
      autoindex on;
    }

    location /hls/ {
      vod hls;
      alias /opt/static/videos/;
      add_header Access-Control-Allow-Headers '*';
      add_header Access-Control-Allow-Origin '*';
      add_header Access-Control-Allow-Methods 'GET, HEAD, OPTIONS';
    }

    location /thumb/ {
      vod thumb;
      alias /opt/static/videos/;
      add_header Access-Control-Allow-Headers '*';
      add_header Access-Control-Allow-Origin '*';
      add_header Access-Control-Allow-Methods 'GET, HEAD, OPTIONS';
    }

    location /dash/ {
      vod dash;
      alias /opt/static/videos/;
      add_header Access-Control-Allow-Headers '*';
      add_header Access-Control-Allow-Origin '*';
      add_header Access-Control-Allow-Methods 'GET, HEAD, OPTIONS';
    }
  }
}

[tecfu]

I see, easy fix.

vod_response_cache                 response_cache 2048m;

Should be chaged to a number within your system's memory constraints.

Thanks guys, sorry to bother you.

[fsouza]

@tecfu no worries, thanks for reporting it! I'll add a comment to the file documenting it.