安装篇：
本教程应用环境为干净centos 5.5 ，预先分好并加载/data分区,并且关闭selinux及iptables
首先修改文件描述符并设定临时端口范围，这些设置重启后生效

复制代码 代码如下:

cat >> /etc/security/limits.conf <* soft nofile 8192
* hard nofile 20480
ddd
cat >> /etc/sysctl.conf <#set temp port range
net.ipv4.ip_local_port_range = 32768 61000
ddd
init 6

确认修改是否正确

复制代码 代码如下:

[root@sudutest ~]# ulimit -n
8192
[root@suduotest ~]# sysctl -n net.ipv4.ip_local_port_range
net.ipv4.ip_local_port_range = 32768 61000

添加squid专用账户

复制代码 代码如下:

groupadd squid
useradd -g squid -s /bin/false -m squid

添加日志目录、设置缓存和日志目录的权限

复制代码 代码如下:

mkdir /data/squidlog/
chown -r squid.squid /data

然后上传或者wget squid3.0软件tar包，tar zxvf解压，并且进入解压后的目录安装编译

复制代码 代码如下:

./configure –prefix=/usr/local/squid3 –enable-async-io=100 –with-pthreads –enable-storeio="aufs,diskd,ufs" –enable-removal-policies="heap,lru" –enable-icmp –enable-delay-pools –enable-useragent-log –enable-referer-log –enable-kill-parent-hack –enable-arp-acl –enable-default-err-language=simplify_chinese –enable-err-languages="simplify_chinese english" –disable-poll –disable-wccp –disable-wccpv2 –disable-ident-lookups –disable-internal-dns –enable-basic-auth-helpers="ncsa" –enable-stacktrace –with-large-files –disable-mempools –with-filedescriptors=65535 –enable-ssl –enable-x-accelerator-var
make
make install
make install-pinger

至此squid已经成功安装了，然后大家自己所需的/usr/local/squid3/etc/squid.conf 配置文件，我这边的配置文件将会在本文末尾贴出来供大家研究。

写好配置文件后执行下面的命令初始化cache目录
/usr/local/squid3/sbin/squid -z
然后运行squid，注：-d参数用来跳过dns检测
/usr/local/squid3/sbin/squid -d
最后设置squid开机自动启动
echo "/usr/local/squid3/sbin/squid -d " >>/etc/rc.local
维护篇：
以下是squid常用的命令
如果修改过配置文件，则用下面的命令重读配置文件（即时生效）
/usr/local/squid3/sbin/squid -k reconfigure
检查配置文件配置的语法是否正确
注：只有像这样的“cache_cf.cc(346) squid.conf:14 unrecognized: 'http1_port'”才是语法错误，
“warning: use of 'reload-into-ims'……”这类提示属于意见建议，可以忽略。
/usr/local/squid3/sbin/squid -k parse
查看squid的日志和进程，看squid运行是否正常

ps -ef |awk '/^squid/'
cat /data/squidlog/cache.log
/usr/local/squid3/sbin/squid -k check ;echo $?

关闭squid
发出关闭信号，等会话结束后彻底关闭
/usr/local/squid3/sbin/squid -k shutdown
关闭squid（更高优先级，直接关闭squid）
/usr/local/squid3/sbin/squid -k interrupt

关闭squid（最高优先级，直接杀死squid进程）
/usr/local/squid3/sbin/squid -k kill
滚动日志文件
/usr/local/squid3/sbin/squid -k rotate
设置每周二凌晨四点30分自动滚动日志

echo "30 4 * * 2 root /usr/local/squid3/sbin/squid -k rotate " >>/etc/crontab

目前应用中的squid.conf文件，由于日志文件增长很快，所以直接输出到/dev/null丢弃掉了

复制代码 代码如下:

#basic
cache_effective_user squid
cache_effective_group squid
pid_filename /usr/local/squid3/var/logs/squid.pid
visible_hostname squid.678114.com
cache_mgr sudu@sudu.us
error_directory /usr/local/squid3/share/errors/simplify_chinese
icon_directory /usr/local/squid3/share/icons
mime_table /usr/local/squid3/etc/mime.conf
hosts_file /etc/hosts

acl deipadd dstdom_regex [0-9]$
http_access deny deipadd

cache_replacement_policy lru
memory_replacement_policy lru

http_port 80 vhost vport

cache_mem 4024 mb
maximum_object_size_in_memory 5120 kb

icp_port 0

#.cache_dir
cache_dir aufs /data/cache 50000 64 128

max_open_disk_fds 0
maximum_object_size 20 mb

#.cache_peer
cache_peer 125.76.225.44 parent 80 0 no-query originserver no-digest name=all
cache_peer_domain all .678114.com

#acl
acl safe_ports port 80
acl ssl_ports port 443
acl lansrc src 192.168.100.0/24
acl webdomain dstdomain .678114.com
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl connect method connect
http_access allow manager localhost
http_access deny manager
http_access deny !safe_ports
http_access deny connect !ssl_ports
http_access allow lansrc
http_access allow webdomain
http_access deny all

#refresh_pattern
refresh_pattern -i /$ 15 90% 600 reload-into-ims
refresh_pattern -i .html$ 15 90% 600 reload-into-ims
refresh_pattern -i .htm$ 15 90% 600 reload-into-ims
refresh_pattern -i .shtml$ 15 90% 600 reload-into-ims
refresh_pattern -i .hml$ 15 90% 600 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$ 120 90% 129600 reload-into-ims
refresh_pattern -i .css$ 120 90% 129600 reload-into-ims
refresh_pattern -i .wma$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .zip$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .mp3$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .rar$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .rm$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .flv$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .rar$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .rm$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .avi$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .3gp$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .mp4$ 1440 90% 21600 reload-into-ims
refresh_pattern -i .wmv$ 1440 90% 21600 reload-into-ims

#keepalived
client_persistent_connections off
server_persistent_connections on

#log
emulate_httpd_log on
logformat web1 %{x-forwarded-for}>h %ui %un [%tl] "%rm %ru http/%rv" %hs %h" "%{user-agent}>h" %ss:%sh
cache_log /data/squidlog/cache.log
cache_access_log /dev/null web1
cache_store_log /dev/null
strip_query_terms off
logfile_rotate 10

#other
forwarded_for on
log_icp_queries off
via off
httpd_suppress_version_string off
ie_refresh off
tcp_recv_bufsize 32 kb
ipcache_size 1024
ipcache_low 90
ipcache_high 95
cache_swap_low 80
cache_swap_high 90
request_header_max_size 128 kb
quick_abort_min 20 kb
quick_abort_max 20 kb
quick_abort_pct 95
connect_timeout 1 minute
negative_ttl 0 minutes
read_timeout 30 seconds
pconn_timeout 120 seconds
half_closed_clients off
client_lifetime 10 minutes
shutdown_lifetime 5 seconds
hierarchy_stoplist cgi-bin ?
access_log /dev/null squid