Update compose #288

This commit is contained in:
khs1994 2017-12-10 11:52:09 +08:00
parent 6bcce7e562
commit 8939af4f97
9 changed files with 63 additions and 299 deletions

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* 0.9-rc3: 2017-12-20 * 0.9-rc3: 2017-12-20
* 精简示例代码
* 调整目录结构 * 调整目录结构
* 0.9-rc2: 2017-12-10 * 0.9-rc2: 2017-12-10

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FROM python:3.6-alpine
ADD . /code
WORKDIR /code
RUN pip install redis flask
CMD ["python", "app.py"]

13
compose/demo/app/app.py Normal file
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from flask import Flask
from redis import Redis
app = Flask(__name__)
redis = Redis(host='redis', port=6379)
@app.route('/')
def hello():
count = redis.incr('hits')
return 'Hello World! 该页面已被访问 {} 次。\n'.format(count)
if __name__ == "__main__":
app.run(host="0.0.0.0", debug=True)

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version: '3'
services:
web:
build: .
ports:
- "5000:5000"
redis:
image: "redis:alpine"

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version: "3"
services:
weba:
build: ./web
expose:
- 80
webb:
build: ./web
expose:
- 80
webc:
build: ./web
expose:
- 80
haproxy:
image: haproxy:latest
volumes:
- ./haproxy:/haproxy-override
- ./haproxy/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro
ports:
- "80:80"
- "70:70"
expose:
- "80"
- "70"

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global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
defaults
log global
mode http
option httplog
option dontlognull
timeout connect 5000ms
timeout client 50000ms
timeout server 50000ms
listen stats
bind 0.0.0.0:70
stats enable
stats uri /
frontend balancer
bind 0.0.0.0:80
mode http
default_backend web_backends
backend web_backends
mode http
option forwardfor
balance roundrobin
server weba weba:80 check
server webb webb:80 check
server webc webc:80 check
option httpchk GET /
http-check expect status 200

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

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#!/usr/bin/python
#authors: yeasy.github.com
#date: 2013-07-05
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')
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("<!DOCTYPE html> <html> <body><center><h1><font color=\"blue\" face=\"Georgia, Arial\" size=8><em>HA</em></font> Webpage Visit Results</h1></center>")
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("<p style=\"font-size:150%\" >#"+ str(request[pair][1]) +": <font color=\"red\">"+str(request[pair][0])+ "</font> requests " + "from &lt<font color=\"blue\">"+guest+"</font>&gt to WebServer &lt<font color=\"blue\">"+pair[1]+"</font>&gt</p>")
else:
file.write("<p style=\"font-size:150%\" >#"+ str(request[pair][1]) +": <font color=\"maroon\">"+str(request[pair][0])+ "</font> requests " + "from &lt<font color=\"navy\">"+guest+"</font>&gt to WebServer &lt<font color=\"navy\">"+pair[1]+"</font>&gt</p>")
file.write("</body> </html>")
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()

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## 使用 ## 使用
### 术语 ### 术语
首先介绍几个术语。 首先介绍几个术语。
* 服务 (`service`):一个应用容器,实际上可以运行多个相同镜像的实例。 * 服务 (`service`):一个应用容器,实际上可以运行多个相同镜像的实例。
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可见,一个项目可以由多个服务(容器)关联而成,`Compose` 面向项目进行管理。 可见,一个项目可以由多个服务(容器)关联而成,`Compose` 面向项目进行管理。
### 场景 ### 场景
下面,我们创建一个经典的 Web 项目:一个 [Haproxy](http://www.haproxy.org/),挂载三个 Web 容器。
创建一个 `compose-haproxy-web` 目录,作为项目工作目录,并在其中分别创建两个子目录:`haproxy` 和 `web` 最常见的项目是 web 网站,该项目应该包含 web 应用和缓存
### web 子目录 下面我们用 `Python` 来建立一个能够记录页面访问次数的 web 网站。
这里用 Python 程序来提供一个简单的 HTTP 服务,打印出访问者的 IP 和 实际的本地 IP。 #### web 应用
#### index.py 新建文件夹,在该目录中编写 `app.py` 文件
编写一个 `index.py` 作为服务器文件,代码为
```python ```python
#!/usr/bin/python from flask import Flask
#authors: yeasy.github.com from redis import Redis
#date: 2013-07-05
import sys app = Flask(__name__)
import BaseHTTPServer redis = Redis(host='redis', port=6379)
from SimpleHTTPServer import SimpleHTTPRequestHandler
import socket
import fcntl
import struct
import pickle
from datetime import datetime
from collections import OrderedDict
class HandlerClass(SimpleHTTPRequestHandler): @app.route('/')
def get_ip_address(self,ifname): def hello():
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) count = redis.incr('hits')
return socket.inet_ntoa(fcntl.ioctl( return 'Hello World! 该页面已被访问 {} 次。\n'.format(count)
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')
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("<!DOCTYPE html> <html> <body><center><h1><font color=\"blue\" face=\"Georgia, Arial\" size=8><em>HA</em></font> Webpage Visit Results</h1></center>")
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("<p style=\"font-size:150%\" >#"+ str(request[pair][1]) +": <font color=\"red\">"+str(request[pair][0])+ "</font> requests " + "from &lt<font color=\"blue\">"+guest+"</font>&gt to WebServer &lt<font color=\"blue\">"+pair[1]+"</font>&gt</p>")
else:
file.write("<p style=\"font-size:150%\" >#"+ str(request[pair][1]) +": <font color=\"maroon\">"+str(request[pair][0])+ "</font> requests " + "from &lt<font color=\"navy\">"+guest+"</font>&gt to WebServer &lt<font color=\"navy\">"+pair[1]+"</font>&gt</p>")
file.write("</body> </html>")
file.close()
pickle.dump(request,open("pickle_data.txt","w"))
if __name__ == '__main__': if __name__ == "__main__":
try: app.run(host="0.0.0.0", debug=True)
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()
```
#### index.html
生成一个临时的 `index.html` 文件,其内容会被 `index.py` 更新。
```bash
$ touch index.html
``` ```
#### Dockerfile #### Dockerfile
编写 `Dockerfile` 文件,内容为 编写 `Dockerfile` 文件,内容为
```docker ```docker
FROM python:2.7 FROM python:3.6-alpine
WORKDIR /code
ADD . /code ADD . /code
EXPOSE 80 WORKDIR /code
CMD python index.py RUN pip install redis flask
CMD ["python", "app.py"]
``` ```
### haproxy 目录 #### docker-compose.yml
编写 `haproxy.cfg` 文件,内容为
```bash
global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
defaults 编写 `docker-compose.yml` 文件,这个是 Compose 使用的主模板文件。
log global
mode http
option httplog
option dontlognull
timeout connect 5000ms
timeout client 50000ms
timeout server 50000ms
listen stats
bind 0.0.0.0:70
stats enable
stats uri /
frontend balancer
bind 0.0.0.0:80
mode http
default_backend web_backends
backend web_backends
mode http
option forwardfor
balance roundrobin
server weba weba:80 check
server webb webb:80 check
server webc webc:80 check
option httpchk GET /
http-check expect status 200
```
### docker-compose.yml
编写 `docker-compose.yml` 文件,这个是 `Compose` 使用的主模板文件。内容十分简单,指定 3 个 `web` 容器,以及 1 个 `haproxy` 容器。
```yaml ```yaml
version: "3" version: '3'
services: services:
weba: web:
build: ./web build: .
expose:
- 80
webb:
build: ./web
expose:
- 80
webc:
build: ./web
expose:
- 80
haproxy:
image: haproxy:latest
volumes:
- ./haproxy:/haproxy-override
- ./haproxy/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro
ports: ports:
- "80:80" - "5000:5000"
- "70:70"
expose: redis:
- "80" image: "redis:alpine"
- "70"
``` ```
### 运行 compose 项目 #### 运行 compose 项目
现在 `compose-haproxy-web` 目录结构如下:
```bash
compose-haproxy-web
├── docker-compose.yml
├── haproxy
│ └── haproxy.cfg
└── web
├── Dockerfile
├── index.html
└── index.py
```
在该目录下执行 `docker-compose up` 命令,会整合输出所有容器的输出。
```bash ```bash
$ docker-compose up $ docker-compose up
Recreating composehaproxyweb_webb_1...
Recreating composehaproxyweb_webc_1...
Recreating composehaproxyweb_weba_1...
Recreating composehaproxyweb_haproxy_1...
Attaching to composehaproxyweb_webb_1, composehaproxyweb_webc_1, composehaproxyweb_weba_1, composehaproxyweb_haproxy_1
``` ```
此时访问本地的 `80` 端口,会经过 `haproxy` 自动转发到后端的某个 web 容器上,刷新页面,可以观察到访问的容器地址的变化。 此时访问本地 `5000` 端口,每次刷新页面,计数就会加 1。
访问本地 `70` 端口,可以查看到 `haproxy` 的统计信息。