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Update compose #288

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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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2
CHANGELOG.md
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* 0.9-rc3: 2017-12-20
* 精简示例代码
* 调整目录结构
* 0.9-rc2: 2017-12-10

5
compose/demo/app/Dockerfile Normal file
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FROM python:3.6-alpine
ADD . /code
WORKDIR /code
RUN pip install redis flask
CMD ["python", "app.py"]

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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)

10
compose/demo/app/docker-compose.yml Normal file
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version: '3'
services:
web:
build: .
ports:
- "5000:5000"
redis:
image: "redis:alpine"

29
compose/demo/compose-haproxy-web/docker-compose.yml
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@ -1,29 +0,0 @@
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"

32
compose/demo/compose-haproxy-web/haproxy/haproxy.cfg
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@ -1,32 +0,0 @@
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

5
compose/demo/compose-haproxy-web/web/Dockerfile
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@ -1,5 +0,0 @@
FROM python:2.7
WORKDIR /code
ADD . /code
EXPOSE 80
CMD python index.py

68
compose/demo/compose-haproxy-web/web/index.py
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@ -1,68 +0,0 @@
#!/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()

198
compose/usage.md
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@ -1,6 +1,7 @@
## 使用
### 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。
@ -10,197 +11,64 @@
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
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
#!/usr/bin/python
#authors: yeasy.github.com
#date: 2013-07-05
from flask import Flask
from redis import Redis
import sys
import BaseHTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler
import socket
import fcntl
import struct
import pickle
from datetime import datetime
from collections import OrderedDict
app = Flask(__name__)
redis = Redis(host='redis', port=6379)
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"))
@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__':
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()
```
#### 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
if __name__ == "__main__":
app.run(host="0.0.0.0", debug=True)
```
#### Dockerfile
编写 `Dockerfile` 文件，内容为
```docker
FROM python:2.7
WORKDIR /code
FROM python:3.6-alpine
ADD . /code
EXPOSE 80
CMD python index.py
WORKDIR /code
RUN pip install redis flask
CMD ["python", "app.py"]
```
### haproxy 目录
编写 `haproxy.cfg` 文件，内容为
```bash
global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
#### docker-compose.yml
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
```
### 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。
编写 `docker-compose.yml` 文件，这个是 Compose 使用的主模板文件。
```yaml
version: "3"
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
web:
build: .
ports:
- "80:80"
- "70:70"
expose:
- "80"
- "70"
- "5000:5000"
redis:
image: "redis:alpine"
```
### 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。
#### 运行 compose 项目
```bash
$ 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。
访问本地 `70` 端口，可以查看到 `haproxy` 的统计信息。
此时访问本地 `5000` 端口，每次刷新页面，计数就会加 1。