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Readme.md
server.js

Readme.md

Node.js service SysVinit scripts

These are some simple init.d scripts for a node server. They can be used on SysVinit systems like Debian Squeeze.

Configuration

The scripts assume the following configuration (you might adjust the paths):

  • The scripts are installed in /var/www/node.example.com/current
  • The server script is server.js
  • The server runs as wwwdocs (i.e. no privileged ports)
  • The server listens on port 10080, but is redirected from port 80 (via iptables)
  • Node is installed in /opt/nodejs/v0.4
  • All output is logged to /var/log/node-service.log

TCP settings

Some TCP tweaks are done in the init script. This allows us to use many connections (open files) and reduce the timeouts, so e.g. broken WebSocket connections don't stay at the server for 2 hours.

    # To allow many connections
    ulimit -n 32767
    
    # TCP tweaks
    sysctl -q -w net.ipv4.tcp_retries2=5 # 15
    sysctl -q -w net.ipv4.tcp_keepalive_time=300 # 7200
    sysctl -q -w net.ipv4.tcp_keepalive_probes=2 # 9
    sysctl -q -w net.ipv4.tcp_keepalive_intvl=5 # 75

As we cannot listen on port 80 as non-root user, we have to redirect port 80 to 10080 (where the server listens):

    # Redirect privileged ports
    iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 10080

Respawn on exit

The "node-service.sh" script restarts the node process when it crashes. The same can be achieved with forever, but I did not find a good way to run forever from an init script.

Author: Nico Kaiser