Centos6.7 yum配置squid3反向代理内网多web服务器
安装好Centos6.7最新版系统，然后防火墙上作映射80映射口到内网机器
IP： 192.168.1.16 Centos6.7 系统，安装squid代理
IP： 192.168.1.17 安装内网OA与网站
IP： 192.168.1.11 安装网站
服务器都放于内网，所以需要路由器或防火墙作映射。
先保证内网可以正常访问服务器网站，然后配置squid。
安装squid很简单。
#： yum install squid -y
然后配置相关域名的转发代理，具体配置如下。
[root@localhost ~]# cat /etc/squid/squid.conf
#
# 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 192.168.0.0/16 # 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 deny manager
# Deny requests to certain unsafe ports
http_access deny !Safe_ports
# Deny CONNECT to other than secure SSL ports
http_access deny 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 vhost vport
# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 1024 16 256
cache_mem 1024 MB
maximum_object_size 10240 KB
maximum_object_size_in_memory 1024 KB
# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid
cache_peer 192.168.1.17 parent 80 0 no-query originserver name=web1
cache_peer 192.168.1.11 parent 80 0 no-query originserver name=web2
cache_peer_domain web1 www.lyjcart.cn test.lyjcart.cn lyjcart.cn mrlujo.lyjcart.
cache_peer_domain web2 www.greatsunfoods.com
# 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
主要是修改了以下内容，当然也添加了内存与其它的参数，这里只是作个简单的能用就行配置。
具体看自己怎么优化与配置。
# And finally deny all other access to this proxy
http_access allow all
# Squid normally listens to port 3128
http_port 80 vhost vport
cache_peer 192.168.1.17 parent 80 0 no-query originserver name=web1
cache_peer 192.168.1.11 parent 80 0 no-query originserver name=web2
cache_peer_domain web1 www.lyjcart.cn test.lyjcart.cn lyjcart.cn mrlujo.lyjcart.
cache_peer_domain web2 www.greatsunfoods.com
如果是squid 采用了round-robin，使用轮询后台服务器，实现，高可用与CDN功能。
可以使用以下方法配置
cache_peer 192.168.1.18 parent 80 0 originserver round-robin weight=1 cache_peer 192.168.1.19 parent 80 0 originserver round-robin weight=1 visible_hostname squid.david.dev cache_mgr mchina_tang@qq.com
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