Python can reload the nginx config file faster than I can write a new one

flap_nginx.py

#!/usr/bin/env python

import time

import psutil
import os
import signal



def reload_process(psname="nginx"):
    pids = psutil.pids()
    for pid in pids:
        try:
            if psutil.Process(pid).name == psname:
                os.kill(pid,signal.SIGHUP)
        except psutil.NoSuchProcess:
            pass

def main():
    reloads = 0
    start_time = time.time()
    end_time = start_time + 1
    while time.time() <= end_time:
        reload_process()
        reloads += 1
    print reloads, start_time, end_time

if __name__ == "__main__":
    while 1:
        main()

nginx.conf

user www-data;
worker_processes auto;
pid /run/nginx.pid;

events {
	worker_connections 768;
	# multi_accept on;
}

http {

upstream myapp1 {
{{ range . }}
        server localhost:{{ .Port }} weight={{ .Weight }};
{{ end }}
    }


server {
	listen 80 default_server;
	root /var/www/html;
	server_name _;
	location / {
        proxy_pass http://myapp1;
	}



}


}

rewrite_nginx_conf.go

package main

import (
    "github.com/samalba/dockerclient"
    "math/rand"
    "text/template"
    "log"
    "os"
)

type PortWeight struct {
        Port int
        Weight int
        }

var templates = template.Must(template.ParseFiles("nginx.conf"))



func main() {
    // Init the client
    docker, _ := dockerclient.NewDockerClient("unix:///var/run/docker.sock", nil)
    rand.Seed(42)


    // Get only running containers
    containers, err := docker.ListContainers(false, false, "")
    if err != nil {
        log.Fatal(err)
    }

    container_ports := make([]*PortWeight,0,0)

    for _, c := range containers {
        container_ports = append(container_ports,&PortWeight{Port: c.Ports[0].PublicPort, Weight: rand.Intn(5) + 1})
        log.Println(c.Id, c.Names, c.Ports[0].PublicPort)
    }

    f, _ := os.Create("/etc/nginx/nginx.conf")
    err = templates.ExecuteTemplate(f, "nginx.conf", container_ports)
    f.Close()

}

https://groups.google.com/forum/#!topic/consul-tool/cYICYkNAlMg looks related