squid 反向缓存 源包报安装 两台服务器

思路：

squid是帮助你访问目标服务器，不是转换你的访问地址比如：html.cxkj.com为192.168.1.10。而是接收到的你的访问申请比如html.cxkj.com，直接用你的这个访问地址html.cxkj.com，直接问配置文件里指定的服务器，比如：192.168.1.10m。以上说明就是下面的实例的说明：

cache_peer              192.168.1.10   parent 80 0 no-query round-robin originserver

cache_peer_domain       192.168.1.10    html.cxkj.com test.cxkj.com

第一行是大体指定转发给谁，那台机器，第二行是指定，什么请求发给谁，请求html.cxkj.com转发给192.168.1.10.

重点：

我开始配置错了，发现虚拟主机怎么都访问不了，其实是我对转发设置的部分理解错了。我开始是这样设置的：

cache_peer              html.cxkj.com   parent 80 0 no-query round-robin originserver

cache_peer              test.cxkj.com   parent 80 0 no-query round-robin originserver

cache_peer_domain       html.cxkj.com   192.168.1.202

cache_peer_domain       test.cxkj.com   192.168.1.202

cache_peer_access       html.cxkj.com   allow   all

cache_peer_access       test.cxkj.com   allow   all

开始理解成：访问202的主机都解析到html.cxkj.com活test.cxkj.com.其实不是这样的，就应该：

用正常的域名访问，解析到squid的外网接口，然后应该利用ip地址解析到相应的地址，解析的时候带着http头信息。squid自己就访问对应的apache了。

应该这样设置：

cache_peer              192.168.1.10   parent 80 0 no-query round-robin originserver

cache_peer_domain       192.168.1.10    html.cxkj.com test.cxkj.com

cache_peer_access       192.168.1.10    allow   all

解释一下：

把所有访问解析到192.168.1.10和192.168.1.241，然后具体的对照cache_peer_domain对应表，对应那个域名走哪个ip地址的服务器，最后cache_peer_access字段允许即可。

状况描述：

两台服务器，一台squid：192.168.1.202域名：sendmail.cxkj.com端口号：80，一台apache：192.168.1.10域名：html.cxkj.com.端口号：80(一下所有配置都是对squid的服务器的配置，没有涉及到apache的服务器。)

1、tar jxvf squid-3.1.15.tar.bz2

2、安装

./configure --prefix=/usr/local/squid
make
make install

3、建立squid用户

useradd squid

4、建立相关文件和文件夹及赋予权限

touch      /usr/local/squid/var/logs/cache.log

touch   /usr/local/squid/var/logs/access.log    squid

touch  /usr/local/squid/var/logs/store.log

touch  /usr/local/squid/var/logs/squid.pid

chown -R squid.squid    /usr/local/squid/var/logs/cache.log

chown -R squid.squid   /usr/local/squid/var/logs/access.log squid

chown -R squid.squid  /usr/local/squid/var/logs/store.log

chown -R squid.squid  /usr/local/squid/var/logs/squid.pid

chmod -R 777 /usr/local/squid/var/logs/cache.log

5、编辑基本网络

vim /etc/hosts    添加：

192.168.1.202   sendmail.cxkj.com

127.0.0.1       sendmail.cxkj.com

vim /etc/resolv.conf

nameserver 192.168.1.10   指定DNS

hostname  sendmail.cxkj.com

/etc/init.d/iptables stop

setenforce 0

把和squid冲突的端口都关闭。

6、编辑配置文件

vim /usr/local/squid/etc/squid.conf

#

visible_hostname sendmail.cxkj.com

dns_nameservers 192.168.1.10

cache_mgr       [e-mail]

cache_effective_user    squid

cache_effective_group   squid

# Recommended minimum configuration:

#

acl manager proto cache_object

acl localhost src 127.0.0.1/32 ::1

acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1

# Example rule allowing access from your local networks.

# Adapt to list your (internal) IP networks from where browsing

# should be allowed

acl localnet src 10.0.0.0/8     # RFC1918 possible internal network

acl localnet src 172.16.0.0/12  # RFC1918 possible internal network

acl localnet src 192.168.1.0/24 # RFC1918 possible internal network

acl localnet src fc00::/7       # RFC 4193 local private network range

acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443

acl Safe_ports port 80          # http

acl Safe_ports port 21          # ftp

acl Safe_ports port 443         # https

acl Safe_ports port 70          # gopher

acl Safe_ports port 210         # wais

acl Safe_ports port 1025-65535  # unregistered ports

acl Safe_ports port 280         # http-mgmt

acl Safe_ports port 488         # gss-http

acl Safe_ports port 591         # filemaker

acl Safe_ports port 777         # multiling http

acl CONNECT method CONNECT

#

# Recommended minimum Access Permission configuration:

#

# Only allow cachemgr access from localhost

http_access allow manager localhost

http_access allow manager

# Deny requests to certain unsafe ports

#http_access allow      all

# Deny CONNECT to other than secure SSL ports

#http_access allow CONNECT !SSL_ports

# We strongly recommend the following be uncommented to protect innocent

# web applications running on the proxy server who think the only

# one who can access services on "localhost" is a local user

#http_access deny to_localhost

#

# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS

#

# Example rule allowing access from your local networks.

# Adapt localnet in the ACL section to list your (internal) IP networks

# from where browsing should be allowed

http_access allow localnet

http_access allow localhost

# And finally deny all other access to this proxy

http_access allow all

# Squid normally listens to port 3128

#http_port 80   accel   vhost   vport

http_port 80 accel   vhost vport

# Uncomment and adjust the following to add a disk cache directory.

cache_dir ufs /usr/local/squid/var/cache 10000 16 256

# Leave coredumps in the first cache dir

coredump_dir /usr/local/squid/var/cache

# Add any of your own refresh_pattern entries above these.

refresh_pattern ^ftp:           1440    20%     10080

refresh_pattern ^gopher:        1440    0%      1440

refresh_pattern -i (/cgi-bin/|\?) 0     0%      0

refresh_pattern .               0       20%     4320

cache_log       /usr/local/squid/var/logs/cache.log

access_log      /usr/local/squid/var/logs/access.log    squid

cache_store_log /usr/local/squid/var/logs/store.log

pid_filename    /usr/local/squid/var/logs/squid.pid

cache_mem       1024    MB

cache_swap_low  90

cache_swap_high 95

maximum_object_size     512000  KB

minimum_object_size     4096    KB

#cache_peer     192.168.1.10    parent 80 0 no-query originserver round-robin

#cache_peer 192.168.1.243 parent 80 0 originserver

#cache_peer html.cxkj.com parent 80 0 originserver

#cache_peer              html.cxkj.com  parent 80 0 no-query round-robin originserver

#cache_peer_domain       html.cxkj.com   sendmail.cxkj.com

cache_peer              192.168.1.10   parent 80 0 no-query round-robin originserver

#cache_peer             192.168.1.10   parent 80 0 no-query round-robin originserver

cache_peer_domain       192.168.1.10    html.cxkj.com test.cxkj.com

#cache_peer_domain      192.168.1.10    test.cxkj.com

cache_peer_access       192.168.1.10    allow   all

#cache_peer_access      192.168.1.10    allow   all

   保存退出。

最后修改/etc/hosts文件。

把squid添加到系统启动项

 编辑 /etc/rc.d/rc.local

 添加如下行： /usr/local/squid/sbin/squid -s

 利用Runc脚本……..

ulimit -HSn 65535

ulimit -n

vim /etc/rc.d/rc.local

ulimit -HSn 65535

保存退出。

7、相关配置

初始化目录

#/usr/local/squid/sbin/squid -z

检查语法：

#/usr/local/squid/sbin/squid -k parse

开启服务：

#/usr/local/squid/sbin/squid –NCd1 (前台正式运行,用于调试非常好.)

 #/usr/local/squid/sbin/squid        (后台运行)

更新配置文件：

 # /usr/local/squid/sbin/squid -k reconfig (更新配置文件后更新)

关闭squid

/usr/local/squid/sbin/squid  -k interrupt

滚动日志文件

/usr/local/squid3/sbin/squid -k rotate

检测系统运行状态

/usr/local/squid/bin/squidclient -h 192.168.1.202 -p 80 mgr:info

清空缓存：

/usr/local/squid/bin/squidclient -h 192.168.1.202 -p 80 -m

8、配置完成：

最后检测：

用Linux自带的工具检测一下Http头看Cache生效没

 #curl -I

 如信息中出现有以下这一行就代表缓存生效了。

 X-Cache: HIT from squid

 如果是

 X-Cache: MISS from squid

 就代表缓存还没储存,或者是没生效.

3，查看你的日志文档。

 #more /usr/local/squid/var/logs/access.log | grep TCP_MEM_HIT

 该指令可以看到在squid运行过程中，有那些文件被squid缓存到内存中，并返回给访问用户。

 #more /usr/local/squid/var/logs/access.log | grep TCP_HIT

 该指令可以看到在squid运行过程中，有那些文件被squid缓存到cache目录中，并返回给访问用户。

 #more /usr/local/squid/var/logs/access.log | grep TCP_MISS

 该指令可以看到在squid运行过程中，有那些文件没有被squid缓存，而是现重原始服务器获取并返回给访问用户。

 关于 TCP_XXXX 等参数及代表的信息，请参看《squid中文权威指南》13.2.1 章节。