由於在測試環境上用docker部署了多個應用,而且他們的端口有的相同,有的又不相同,數量也比較多,在使用jenkins發版本的時候,不好配置,於是想要寫一個腳本,能在docker 容器創建、停止的時候,自動生成nginx反向代理,然後reload nginx
我的原則是盡量簡單,輕量,內存占用少
目標很明確,只要能監聽到docker的容器啟動/停止事件,即可
網上查了一下可以用docker events來監聽docker事件,試了一下,發現基本可以滿足,於是用python寫了一段程序,用來監聽docker事件
python
#!/usr/bin/python
# coding: utf8
import os
import json
import re
import subprocess
def override(path, text):
if not os.path.exists(path) and os.path.exists(path+"_temp"):
os.rename(path+"_temp",path)
fw = open(path+"_temp", 'wb')
fw.write(text)
fw.close()
if os.path.exists(path):
os.remove(path)
os.rename(path+"_temp", path)
def read(path):
try:
fr = open(path, "rb")
except IOError:
print "The file don't exist, Please double check!"
return
lines = fr.readlines()
ret = ''
for line in lines:
ret += line
return ret
def read_jsonfile(path):
return json.loads(read(path))
def cmd(command):
return os.popen(command).read()
def get_name(container):
return cmd("docker inspect -f '{{.Name}}' " + container).replace("/", "").replace('\n', '')
def get_ip(container):
return cmd("docker inspect -f '{{.NetworkSettings.IPAddress}}' " + container).replace('\n', '')
def get_port(container):
return cmd("docker inspect -f '{{.Config.ExposedPorts}}' " + container).replace('/tcp:{}]', '').replace('map[', '').replace('\n', '')
def get_info(container):
filename = "/var/lib/docker/containers/" + container + "/config.v2.json"
config = read_jsonfile(filename)
name = config['Name'].replace("/", "")
port = config['Config']['ExposedPorts'].keys()[0].replace('/tcp', '')
ip = cmd("docker inspect -f '{{.NetworkSettings.IPAddress}}' " + name)
# ip = config['NetworkSettings']['Networks']['bridge']['IPAddress']
ret = {'name': name, 'port': port, 'ip': ip}
return ret
tpl = """
server {
listen 80;
server_name $name.test.com;
location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Host $http_host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://$ip:$port;
}
}
"""
def generate_conf():
print "generate_conf"
out = cmd("docker ps | grep -v CONTAINER | awk '{print $1}'")
containers = out.split("\n")
servers = ''
hosts = ''
for con in containers:
if con != '':
name = get_name(con)
ip = get_ip(con)
port = get_port(con)
print ip, port
if len(port) >= 2:
servers += tpl.replace("$name", name).replace("$ip", ip).replace("$port", port)
hosts += "11.12.13.14 " + name + ".test.com\n"
override('/usr/local/openresty/nginx/conf/vhost.conf', servers)
override('/usr/local/openresty/nginx/html/vhost.html', "<pre>" + hosts + "</pre>")
def reload_nginx():
print "reload nginx"
cmd('nginx -s reload')
def auto_reload():
generate_conf()
reload_nginx()
print " ==================== docker events ==================== "
# auto_reload()
proc = subprocess.Popen(["docker", "events"],
# shell=True, # windows: true, linux: false
stdout=subprocess.PIPE)
while 1:
out = proc.stdout.readline()
event = re.sub('\(|\)', "", out).split(" ")
if out.find('container stop') != -1:
auto_reload()
print ' container stop '
elif out.find('container start') != -1:
auto_reload()
print ' start container '
if out == '':
print "out "
break
啟動命令:
nohup ./docker.py > /dev/null 2>&1 &
程序會在後台運行,斷開ssh也不會結束
主要就是生成一個 conf 文件,這個文件要在nginx.conf裡面引入,然後每次有容器啟動/停止都生成這個文件,然後重啟nginx,我這了還把容器名加上一個域名,組合成了一個子域名,然後把對應的映射關系生成了一個html文件,通過浏覽器可以訪問這個文件,然後把對應的代碼 復制到本機的 hosts 文件裡面,可以實現通過域名訪問應用,當然只是開發測試的時候會這麼做,但是也足夠了。
更多Nginx相關教程見以下內容:
CentOS 6.2實戰部署Nginx+MySQL+PHP http://www.linuxidc.com/Linux/2013-09/90020.htm
搭建基於Linux6.3+Nginx1.2+PHP5+MySQL5.5的Web服務器全過程 http://www.linuxidc.com/Linux/2013-09/89692.htm
CentOS 6.3下Nginx性能調優 http://www.linuxidc.com/Linux/2013-09/89656.htm
CentOS 6.3下配置Nginx加載ngx_pagespeed模塊 http://www.linuxidc.com/Linux/2013-09/89657.htm
Ubuntu 16.04 LTS 上安裝 Nginx、MariaDB 和 HHVM 運行 WordPress http://www.linuxidc.com/Linux/2016-10/136435.htm
Nginx安裝配置使用詳細筆記 http://www.linuxidc.com/Linux/2014-07/104499.htm
Linux(RHEL7.0)下安裝Nginx-1.10.2 http://www.linuxidc.com/Linux/2016-10/136484.htm
Nginx日志過濾 使用ngx_log_if不記錄特定日志 http://www.linuxidc.com/Linux/2014-07/104686.htm
Nginx 的詳細介紹:請點這裡
Nginx 的下載地址:請點這裡