1. 安装Squid,添加软件源(vim /etc/yum.repos.d/squid.repo)
[squid]
name=Squid beta repo for CentOS Linux 6 - $basearch
#IL mirror
baseurl=http://www1.ngtech.co.il/repo/centos/6/beta/$basearch/
failovermethod=priority
enabled=1
gpgcheck=0

然后执行:

yum update
yum install squid.x86_64
  1. 配置用户验证(注意:密码最多8个字符):
sudo htpasswd -d /etc/squid/squid_passwd user1
New password:
Re-type new password:
Adding password for user user1

检查密码:

# /usr/lib64/squid/basic_ncsa_auth /etc/squid/squid_passwd
user1 pass
ERR Wrong password
user1  123456
OK
  1. 如下所示为squid的最终配置文件:
[root@iZ23q9zpdxsZ squid]# vim /etc/squid/squid.conf
#
# Recommended minimum configuration:
#

# 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 443 563
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443 563     # 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:
#
# 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

# Only allow cachemgr access from localhost
http_access allow localhost manager
http_access deny manager

# 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

# authentication
auth_param basic program /usr/lib64/squid/basic_ncsa_auth /etc/squid/squid_passwd
auth_param basic children 5
auth_param basic credentialsttl 2 hours
auth_param basic realm Web proxy server
auth_param basic casesensitive off
acl ncsa_users proxy_auth REQUIRED
http_access allow ncsa_users

# And finally deny all other access to this proxy
http_access deny all
http_port 8888
# https_port 443 cert=/etc/squid/ssl-cert/cert.pem key=/etc/squid/ssl-cert/key.pem

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256

# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid

#
# 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

参考资料:
http://wiki.squid-cache.org/SquidFaq/BinaryPackages#KnowledgeBase.2FCentOS.Squid-3.5
http://bastengao.com/blog/2015/01/squid-basic-config.html