Check avaliable ports：
netstat -tanp | grep LISTEN
Download squid：
yum install squid
Backup config file：
cp /etc/squid/squid.conf /etc/squid/squid.conf.original
Modify config file：
vim /etc/squid/squid.conf
config file on going：
#
# 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 169.254.0.0/16 # 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:
#
# 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
# And finally deny all other access to this proxy
http_access deny all
# Squid normally listens to port 3128
http_port 3128
icp_port 0
# Uncomment and adjust the following to add a disk cache directory.
cache_dir ufs /var/lib/ceph/squidcache 100 16 256
# Leave coredumps in the first cache dir
coredump_dir /var/lib/ceph/squidcache
#
# 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
refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880
#
# redirect the flow to the main proxy.
#
cache_peer 135.245.48.12 parent 8000 0 no-query default
never_direct allow all
modify cache directory：
mkdir /var/lib/ceph/squidcache
modify cache directory owner：
chown squid:squid /var/lib/ceph/squidcache
set up squid：
chkconfig --level 345 squid on
chkconfig --list squid
squid -z
restart squid in case of modifing the config file：
restorecon -R /var/spool/squid
service squid restart
##Set environment on LAN computers：
export http_proxy=192.168.10.50:3128
export ftp_proxy=192.168.10.50:3128
export rsync_proxy=192.168.10.50:3128
export https_proxy=192.168.10.50:3128