docker-compose

docker-compose

https://docs.docker.com/compose/

两个重要概念：
服务(service): 一个应用的容器，实际上可以包含若干运行相同镜像的容器实例

项目(project): 一组关联的应用容器组成的一个完整业务单元，在docker-compose.yml文件定义

=====pre=====
install docker

vi /etc/sysctl.conf

net.ipv4.ip_forward = 1


=====install=====
curl -L "https://github.com/docker/compose/releases/download/1.28.5/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose
ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
$ docker-compose --version

project haproxy_web
haproxy and three web

tree haproxy_web

haproxy_web
├── docker-compose.yml
├── haproxy
│   └── haproxy.cfg
└── web

├── Dockerfile
├── index.html
└── index.py

mkdir /project_home/haproxy_web
mkdir /project_home/haproxy_web/haproxy
mkdir /project_home/haproxy_web/web

=====web=====
cd /project_home/haproxy_web/web

vi Dockerfile

FROM python:2.7
WORKDIR /code
ADD . /code
EXPOSE 80
CMD python index.py


touch index.html

vi index.py

!/usr/bin/env python

import sys
import BaseHTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler
import socket
import fcntl
import struct
import pickle
from datetime import datetime
from collections import OrderedDict

class HandlerClass(SimpleHTTPRequestHandler):

def get_ip_address(self,ifname):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    return socket.inet_ntoa(fcntl.ioctl(
        s.fileno(),
        0x8915,  # SIOCGIFADDR
        struct.pack('256s', ifname[:15])
    )[20:24])
def log_message(self, format, *args):
    if len(args) < 3 or "200" not in args[1]:
        return
    try:
        request = pickle.load(open("pickle_data.txt","r"))
    except:
        request=OrderedDict()
    time_now = datetime.now()
    ts = time_now.strftime('%Y-%m-%d %H:%M:%S')
    hostname = socket.gethostname()
    server = socket.gethostbyname(hostname)
    #server = self.get_ip_address('eth0')
    host=self.address_string()
    addr_pair = (host,server)
    if addr_pair not in request:
        request[addr_pair]=[1,ts]
    else:
        num = request[addr_pair][0]+1
        del request[addr_pair]
        request[addr_pair]=[num,ts]
    file=open("index.html", "w")
    file.write("  
HA Webpage Visit Results");
    for pair in request:
        if pair[0] == host:
            guest = "LOCAL: "+pair[0]
        else:
            guest = pair[0]
        if (time_now-datetime.strptime(request[pair][1],'%Y-%m-%d %H:%M:%S')).seconds < 3:
            file.write("
#"+ str(request[pair][1]) +": "+str(request[pair][0])+ " requests " + "from <"+guest+"> to WebServer <"+pair[1]+">
")
        else:
            file.write("
#"+ str(request[pair][1]) +": "+str(request[pair][0])+ " requests " + "from <"+guest+"> to WebServer <"+pair[1]+">
")
    file.write(" ");
    file.close()
    pickle.dump(request,open("pickle_data.txt","w"))

if name == '__main__':

try:
    ServerClass  = BaseHTTPServer.HTTPServer
    Protocol     = "HTTP/1.0"
    addr = len(sys.argv) < 2 and "0.0.0.0" or sys.argv[1]
    port = len(sys.argv) < 3 and 80 or int(sys.argv[2])
    HandlerClass.protocol_version = Protocol
    httpd = ServerClass((addr, port), HandlerClass)
    sa = httpd.socket.getsockname()
    print "Serving HTTP on", sa[0], "port", sa[1], "..."
    httpd.serve_forever()
except:
    exit()

======haproxy======
cd /project_home/haproxy_web/haproxy

vi haproxy.cfg

global

log 127.0.0.1 local0
log 127.0.0.1 local1 notice

defaults

log global
mode http
option dontlognull
timeout connect 5s
timeout client 50s
timeout server 50s

listen stats

bind *:70
stats enable
stats uri /

frontend balancer

bind *:80
mode http
default_backend web_backends

backend web_backends

mode http
option forwardfor
balance roundrobin
server web-1 web-1:80 check
server web-2 web-2:80 check
server web-3 web-3:80 check
option httpchk GET /
http-check expect status 200

========project haproxy_web========
cd /project_home/haproxy_web

vi docker-compose.yml

web-1:
build: ./web
expose:

- 80

web-2:
build: ./web
expose:

- 80

web-3:
build: ./web
expose:

- 80 

haproxy:
image: haproxy:1.6
volumes:

- ./haproxy:/haproxy-override
- ./haproxy/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro

links:

- web-1
- web-2
- web-3

ports:

- "80:80"
- "70:70"

=====up stop start====
cd /project_home/haproxy_web

docker-compose up -d

docker-compose stop

docker-compose start

docker ps -a