meteor nginx load balance with sticky session, used by vida.io

nginx.conf

# Sticky session module for nginx
# https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng/
# nginx configure command: ./configure --with-http_ssl_module --add-module=../nginx-sticky-module-ng/ --sbin-path=/usr/local/sbin --with-http_gzip_static_module

upstream vida_node_server {
    sticky path=/;
    server 127.0.0.1:3000 max_fails=3 fail_timeout=30s;
    server [server2]:3000 max_fails=3 fail_timeout=30s;
}

map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

server {
  listen 80;
  server_name vida.io;

  location ^~ /(assets)/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  }

  location / {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://vida_node_server;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
    proxy_max_temp_file_size 0;
  }

  error_page 500 502 503 504 /500;
  client_max_body_size 4G;
}

server {
  listen       443;
  server_name  vida.io;

  ssl                  on;
  ssl_certificate      [path_to_cert];
  ssl_certificate_key  [path_to_cert_key];

  ssl_session_timeout  5m;

  ssl_protocols  SSLv2 SSLv3 TLSv1;
  ssl_ciphers  HIGH:!aNULL:!MD5;
  ssl_prefer_server_ciphers   on;

  location ^~ /(assets)/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  }

  try_files $uri/index.html $uri;
  location / {
      proxy_set_header Host $host;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto https;
      proxy_redirect off;
      proxy_pass http://vida_node_server;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection $connection_upgrade;
      proxy_max_temp_file_size 0;
  }

  error_page 500 502 503 504 /500;
  client_max_body_size 4G;
}