FreeBSD网站平台建设全过程 第二步

  •   2009-07-28/15:34
  • 第二步:接入Internet并配制代理服务

    使用ADSL接入Internet有两种情况,通过拨号获取动态ip或服务商直接给定静态ip。后者配制起来较容易。本文先讨论动态ip如何设置。

    由于第一步重新编译内核时已经加进了对Firewall的支持。
    这里就可以通过直接编辑/etc/ppp/ppp.conf文件和/etc/rc.conf文件就可以上网并支持NAT方式透明代理了。

    # vi /etc/ppp/ppp.conf

    我的ppp.conf文件内容如下:(注意set前要留空格)

    default:
      set log Phase tun command
      set ifaddr 10.0.0.1/0 10.0.0.2/0
    adsl: # 配置代号
      set device PPPoE:vr0 # vr0 改成你连接ADSL modem的网卡名
      set mru 1492
      set mtu 1492
      set authname username# username是拨号用户名
      set authkey password # password是拨号密码
      set dial
      set login
      add default HISADDR

    # vi /etc/rc.conf

    我的rc.conf文件内容如下:(动态ip)

    # -- sysinstall generated deltas -- # Tue Jul 15 21:20:28 1997
    # Created: Tue Jul 15 21:20:28 1997
    # Enable network daemons for user convenience.
    # Please make all changes to this file, not to /etc/defaults/rc.conf.
    # This file now contains just the overrides from /etc/defaults/rc.conf.
    hostname="wwwx.3322.org" # 你的主机域名
    ifconfig_fxp0="inet 192.168.0.1 netmask 255.255.255.0" #内网网卡ip地址,fxp0是网卡名
    inetd_enable="YES" # 开机加载inetd
    kern_securelevel_enable="NO"
    linux_enable="YES"
    nfs_reserved_port_only="NO"
    sendmail_enable="NO"
    sshd_enable="YES"
    usbd_enable="NO"
    gateway_enable="YES"
    firewall_enable="YES"#启用防火墙
    firewall_script="/etc/rc.firewall"
    firewall_type="open"
    firewall_quiet="YES"
    firewall_logging_enable="YES"
    ppp_enable="YES" # 开机自动拨号
    ppp_mode="ddial"
    ppp_nat="YES"# 启用透明代理
    ppp_profile="adsl" # 配置代号
    # -- sysinstall generated deltas --# Wed Jul 16 06:52:13 1997

    这样重新启动后就可以拨号上网并实现透明代理了。客户端需要设置dns服务器为服务商提供的dns,网关设成代理服务器的内网卡ip地址,这里是192.168.0.1。并把IE中“internet选项”关于连接设置的所有复选框清除。

    如果解析不了域名,检查一下/etc/resolv.conf文件是否加入了正确的dns服务器地址。


    如果是静态ip方式,则只需要编辑/etc/rc.conf文件。

    我的/etc/rc.conf文件如下:(静态ip)

    # -- sysinstall generated deltas -- # Tue Jul 15 21:20:28 1997
    # Created: Tue Jul 15 21:20:28 1997
    # Enable network daemons for user convenience.
    # Please make all changes to this file, not to /etc/defaults/rc.conf.
    # This file now contains just the overrides from /etc/defaults/rc.conf.
    hostname="wwwx.3322.org" #主机域名
    defaultrouter="218.10.104.1" #服务商提供的路由器地址
    ifconfig_vr0="inet 218.10.104.188 netmask 255.255.255.0" #服务商提供的静态ip
    ifconfig_fxp0="inet 192.168.0.1 netmask 255.255.255.0" #内部网卡ip
    inetd_enable="YES" #开机加载inetd
    kern_securelevel_enable="NO"
    linux_enable="YES"
    nfs_reserved_port_only="NO"
    sshd_enable="YES"
    sendmail_enable="NO"
    usbd_enable="NO"
    gateway_enable="YES"
    firewall_enable="YES"
    firewall_script="/etc/rc.firewall"
    firewall_type="open"
    firewall_quiet="YES"
    firewall_logging_enable="YES"
    natd_enable="YES"# 启用透明代理
    natd_interface="vr0" # natd接口,vr0为连接外网modem的网卡
    # -- sysinstall generated deltas -- # Wed Jul 16 06:52:13 1997

    重起后网络连接及透明代理生效。客户端同样要按上面说的方法配制。


    使用Squid:

    Squid是一个非常不错的代理缓存软件。我曾经一直在使用,后来因为我经常要改变web服务器里的网页,而Squid总是把我以前的页面缓存,致使不能马上反映页面的更新情况,再加上公司上网的负担不是很重。所以就不用了。

    安装方法:

    在FreeBSD下安装软件最方便的方法是使用ports。本文为了让大家对通用的软件安装方法做一定的了解,我们采用通用的方法来安装Squid,也就是说,下面的方法同样适用于Linux或其他Unix版本。

    在ylf的用户目录下创建目录app用来存放程序安装临时文件:

    # mkdir /home/ylf/app

    将用户ylf设为/home/ylf/app目录及其子目录的所有者

    # chown –R ylf /home/ylf/app

    到 下载Squid 的最新稳定版本,现在是squid-2.5.STABLE3

    打开IE浏览器,在地址栏输入ftp://192.168.0.1 ,出现ftp登陆对话框,输入用户名ylf及密码,登录成功后。将下载的squid-2.5.STABLE3复制到app目录中。

    执行如下命令:

    # cd /home/ylf/app
    # tar zxvf squid-2.5.STABLE3.tar.gz #解压缩安装包
    # cd squid-2.5.STABLE3 #进入解开的目录
    # ./configure --prefix=/usr/local/squid #配制、将squid安装在/usr/local/squid目录
    # make all#编译
    # make install#安装

    下面编辑Squid的配置文件:

    # cd /usr/local/squid/etc

    将原来的配置文件改名:

    # mv squid.conf squid.conf.bak

    编辑新的配置文件:

    # vi squid.conf

    我的squid.conf内容如下:

    #取消对代理阵列的支持
    icp_port 0

    #对日志文件和pid文件位置进行设置
    cache_store_log none
    cache_access_log /usr/local/squid/var/logs/access.log
    cache_log /usr/local/squid/var/logs/cache.log
    emulate_httpd_log on
    pid_filename /usr/local/squid/var/logs/squid.pid

    #设置运行时的用户和组权限
    cache_effective_user squid
    cache_effective_group squid

    #设置管理信息
    visible_hostname wwwx.3322.org.
    cache_mgr yourname@yourdomain.com

    #设置监听地址和端口
    http_port 3128
    udp_incoming_address 0.0.0.0

    #设置squid用户hot object的物理内存的大小以及设置cache目录
    cache_mem 32 MB
    cache_dir ufs /usr/local/squid/cache 1024 16 256

    #访问控制设置
    acl mynet src 192.168.0.0/255.255.255.0
    acl all src 0.0.0.0/0.0.0.0
    http_access allow mynet
    http_access deny all

    #透明代理设置
    httpd_accel_host virtual
    httpd_accel_port 80
    httpd_accel_with_proxy on
    httpd_accel_uses_host_header on

    #swap 性能微调
    half_closed_clients off
    cache_swap_high 100%
    cache_swap_low 80%
    maximum_object_size 1024 KB

    #控制对象的超时时间
    refresh_pattern -i .html 1440 90% 129600 reload-into-ims
    refresh_pattern -i .shtml 1440 90% 129600 reload-into-ims
    refresh_pattern -i .hml 1440 90% 129600 reload-into-ims
    refresh_pattern -i .gif 1440 90% 129600 reload-into-ims
    refresh_pattern -i .swf 1440 90% 129600 reload-into-ims
    refresh_pattern -i .jpg 1440 90% 129600 reload-into-ims
    refresh_pattern -i .png 1440 90% 129600 reload-into-ims
    refresh_pattern -i .bmp 1440 90% 129600 reload-into-ims
    refresh_pattern -i .js 1440 90% 129600 reload-into-ims

    需要改的地方是访问控制设置中的子网改成你自己的子网。其他的地方可根据需要调整。不改也可。

    如果不使用日志,将日志设置部分改成如下句子:

    cache_store_log none
    cache_access_log /dev/null
    cache_log /dev/null

    添加squid系统用户和组:

    # pw groupadd squid
    # pw useradd squid -g squid -s /sbin/nologin

    建立cache目录:

    # mkdir /usr/local/squid/cache

    改变cache目录和logs目录的所有者为squid用户和组:

    # chown –R squid /usr/local/squid/cache
    # chgrp –R squid /usr/local/squid/cache
    # chown –R squid /usr/local/squid/var/logs
    # chgrp –R squid /usr/local/squid/var/logs

    运行squid –z建立cache目录结构:

    # /usr/local/squid/sbin/squid –z

    测试squid运行情况:

    # /usr/local/squid/sbin/squid –NCd1

    出现下面显示证明squid安装成功:

    2003/06/21 18:01:09| Starting Squid Cache version 2.5.STABLE3 for i386-unknown-freebsd4.7...
    2003/06/21 18:01:09| Process ID 160
    2003/06/21 18:01:09| With 957 file descriptors available
    2003/06/21 18:01:09| Performing DNS Tests...
    2003/06/21 18:01:09| Successful DNS name lookup tests...
    2003/06/21 18:01:09| DNS Socket created at 0.0.0.0, port 1029, FD 4
    2003/06/21 18:01:09| Adding nameserver 202.97.224.68 from /etc/resolv.conf
    2003/06/21 18:01:09| Unlinkd pipe opened on FD 9
    2003/06/21 18:01:09| Swap maxSize 1048576 KB, estimated 80659 objects
    2003/06/21 18:01:09| Target number of buckets: 4032
    2003/06/21 18:01:09| Using 8192 Store buckets
    2003/06/21 18:01:09| Max Mem size: 32768 KB
    2003/06/21 18:01:09| Max Swap size: 1048576 KB
    2003/06/21 18:01:09| Store logging disabled
    2003/06/21 18:01:09| Rebuilding storage in /usr/local/squid/cache (DIRTY)
    2003/06/21 18:01:09| Using Least Load store dir selection
    2003/06/21 18:01:09| Current Directory is /usr/local/squid/etc
    2003/06/21 18:01:09| Loaded Icons.
    2003/06/21 18:01:09| Accepting HTTP connections at 0.0.0.0, port 3128, FD 8.
    2003/06/21 18:01:09| WCCP Disabled.
    2003/06/21 18:01:09| Ready to serve requests.
    2003/06/21 18:01:16| Done scanning /usr/local/squid/cache swaplog (0 entries)
    2003/06/21 18:01:16| Finished rebuilding storage from disk.
    2003/06/21 18:01:16| 0 Entries scanned
    2003/06/21 18:01:16| 0 Invalid entries.
    2003/06/21 18:01:16| 0 With invalid flags.
    2003/06/21 18:01:16| 0 Objects loaded.
    2003/06/21 18:01:16| 0 Objects expired.
    2003/06/21 18:01:16| 0 Objects cancelled.
    2003/06/21 18:01:16| 0 Duplicate URLs purged.
    2003/06/21 18:01:16| 0 Swapfile clashes avoided.
    2003/06/21 18:01:16| Took 7.3 seconds ( 0.0 objects/sec).
    2003/06/21 18:01:16| Beginning Validation Procedure
    2003/06/21 18:01:16| Completed Validation Procedure
    2003/06/21 18:01:16| Validated 0 Entries
    2003/06/21 18:01:16| store_swap_size = 0k
    2003/06/21 18:01:17| storeLateRelease: released 0 object

    否则根据提示检查配制文件。

    为了使squid的透明代理起作用,需要设置端口转发。方法如下:

    编辑/etc/rc.firewall文件,添加下面一句:

    ipfw add 00500 fwd 127.0.0.1,3128 tcp from 192.168.0.0/24 to any 80

    下面建立squid的启动脚本squid.sh:

    首先建立/usr/local/etc/rc.d目录:

    # mkdir /usr/local/etc
    # mkdir /usr/local/etc/rc.d
    # cd /usr/local/etc/rc.d
    # vi squid.sh

    文件内容如下:

    #!/bin/sh

    # if ! PREFIX=$(expr $0 : "\(/.*\)/etc/rc\.d/$(basename $0)\$"); then
    # echo "$0: Cannot determine the PREFIX" >&2
    # exit 1
    # fi

    case "$1" in
    start)
    if [ -x /usr/local/squid/sbin/squid -a -f /usr/local/squid/etc/squid.conf ]; then
    (cd /usr/local/squid/var/logs; /usr/local/squid/sbin/squid >/dev/null 2>&1 &) ; echo -n ' squid'
    fi
    ;;
    stop)
    /usr/local/squid/sbin/squid -k shutdown 2>&1
    # Uncomment this if you'd like the system to (attempt to
    # wait for) squid to shut down cleanly
    #echo "Sleeping for 45 seconds to allow squid to shutdown.."
    #sleep 45
    ;;
    *)
    echo "Usage: `basename $0` {start|stop}" >&2
    ;;
    esac

    exit 0

    这样每次启动后,squid就会自动运行。

    运行/usr/local/etc/rc.d/squid.sh start 启动squid

    运行/usr/local/etc/rc.d/squid.sh stop 停止squid


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