global
        log 127.0.0.1 local2
        daemon
        maxconn 256
        log 127.0.0.1 local2 info
defaults
        log global
        mode http
        timeout connect 5000ms
        timeout client 50000ms
        timeout server 50000ms
        option  dontlognull

listen stats :8888
        stats enable
        stats uri       /admin
        stats auth      admin:1234

frontend oldboy.org
        bind 0.0.0.0:80
        option httplog
        option httpclose
        option  forwardfor
        log global
        acl www hdr_reg(host) -i www.oldboy.org
        use_backend www.oldboy.org if www

backend www.oldboy.org
        server 100.1.7.9 100.1.7.9 weight 20 maxconn 3000
        
backend buy.oldboy.org
        server 100.1.7.90 100.1.7.90 weight 20 maxconn 3000

配置文件

#!/usr/bin/env python
# -*- coding:utf-8 -*-
 
 
def fetch(backend):
    result = []
    with open(‘ha.conf‘, ‘r‘) as f:
        flag = False
        for line in f:
            if line.strip().startswith(‘backend‘) and line.strip() == "backend " + backend:
                flag = True
                continue
            if flag and line.strip().startswith(‘backend‘):
                break
            if flag and line.strip():
                result.append(line.strip())
 
    return result
 
 
def add(backend, record):
    result = fetch(backend)
    if not result:
        # 无backend，无record
        pass
    else:
        # 有backend
        if record in result:
            # 记录record
            pass
        else:
            result.append(record)
            with open(‘ha.conf‘, ‘r‘) as old, open(‘new.conf‘, ‘w‘) as new:
                continue_flag = False
                for line in old:
 
                    if line.strip().startswith(‘backend‘) and line.strip() == "backend " + backend:
                        continue_flag = True
                        new.write(line)
                        for temp in result:
                            new.write(" "*8 + temp + "\n")
                        continue
 
                    if continue_flag and line.strip().startswith(‘backend‘):
                        continue_flag = False
 
                    if continue_flag:
                        pass
                    else:
                        new.write(line)
 
 
def add2(backend, record):
    with open(‘ha.conf‘, ‘r‘) as old, open(‘new.conf‘, ‘w‘) as new:
        in_backend = False
        has_backend = False
        has_record = False
        for line in old:
            if line.strip().startswith(‘backend‘) and line.strip() == "backend " + backend:
                has_backend = True
                in_backend = True
                new.write(line)
                continue
 
            if in_backend and line.strip().startswith(‘backend‘):
                if not has_record:
                    new.write(" "*8 + record + ‘\n‘)
                new.write(line)
                in_backend = False
                continue
 
            if in_backend and line.strip() == record:
                has_record = True
                new.write(line)
                continue
 
            if line.strip():
                new.write(line)
 
        if not has_backend:
            # 写backend，写record
            new.write(‘backend ‘+ backend + ‘\n‘)
            new.write(‘ ‘*8 + record + ‘\n‘)
 
 
# ret = fetch("www.oldboy.org")
# print(ret)
 
# add(‘www.oldboy.org‘, "server 100.1.7.10 100.1.7.10 weight 20 maxconn 3000")
# add2(‘www.oldboy.org‘, "server 100.1.7.11 100.1.7.11 weight 20 maxconn 3000")