monitor_memcached.js

#!/usr/bin/env node

var sys = require('sys')
var filename = process.ARGV[2];

if (!filename)
  return sys.puts("Usage: node monitor_memcached.js /path/to/memcached.log");

// Look at http://nodejs.org/api.html#_child_processes for detail.
var tail = process.createChildProcess("tail", ["-f", filename]);
sys.puts("Monitoring " + filename);

tail.addListener("output", function (data) {
  if(data == "event_add: No such file or directory\n") {
    sys.exec("/etc/init.d/memcached restart", function(err, stdout, stderr){
      if(err) {
        sys.puts(stdout);
        sys.puts(stderr);
      } else {
        sys.puts(stdout);
        sys.puts('memcached restarted');
      }
    })
  }
});