分类： LINUX
2016-10-18 16:08:01
At a terminal prompt, enter the following command to install the Squid server:
sudo apt install squid3
Squid is configured by editing the directives contained within the /etc/squid3/squid.conf configuration file. The following examples illustrate some of the directives which may be modified to affect the behavior of the Squid server. For more in-depth configuration of Squid, see the References section.
Prior to editing the configuration file, you should make a copy of the original file and protect it from writing so you will have the original settings as a reference, and to re-use as necessary. Make this copy and protect it from writing using the following commands:
sudo cp /etc/squid3/squid.conf /etc/squid3/squid.conf.original sudo chmod a-w /etc/squid3/squid.conf.original
To set your Squid server to listen on TCP port 8888 instead of the default TCP port 3128, change the http_port directive as such:
http_port 8888
Change the visible_hostname directive in order to give the Squid server a specific hostname. This hostname does not necessarily need to be the computer's hostname. In this example it is set to weezie
visible_hostname weezie
Using Squid's access control, you may configure use of Internet services proxied by Squid to be available only users with certain Internet Protocol (IP) addresses. For example, we will illustrate access by users of the 192.168.42.0/24 subnetwork only:
Add the following to the bottom of the ACL section of your /etc/squid3/squid.conf file:
acl fortytwo_network src 192.168.42.0/24
Then, add the following to the top of the http_access section of your /etc/squid3/squid.conf file:
http_access allow fortytwo_network
Using the excellent access control features of Squid, you may configure use of Internet services proxied by Squid to be available only during normal business hours. For example, we'll illustrate access by employees of a business which is operating between 9:00AM and 5:00PM, Monday through Friday, and which uses the 10.1.42.0/24 subnetwork:
Add the following to the bottom of the ACL section of your /etc/squid3/squid.conf file:
acl biz_network src 10.1.42.0/24 acl biz_hours time M T W T F 9:00-17:00
Then, add the following to the top of the http_access section of your /etc/squid3/squid.conf file:
http_access allow biz_network biz_hours
After making changes to the /etc/squid3/squid.conf file, save the file and restart the squid server application to effect the changes using the following command entered at a terminal prompt:
sudo systemctl restart squid3.service
#
# 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 192.168.0.0/16 # RFC1918 possible internal network
...
...
acl SSL_ports port 443
acl Safe_ports port 80 # 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 all
# And finally deny all other access to this proxy
#http_access deny all
# Squid normally listens to port 3128
http_port 3128
# 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