Squid
Squid HTTP Caching Proxy
squid : Optimising Web Delivery https://www.squid-cache.org/
TCP Port
Squid normally listens to port 3128
Installation
Ubuntu:
sudo apt update sudo apt install squid
Ubuntu Default Configuration
(trimmed out comments and empty)
# grep -v "#" /etc/squid/squid.conf | grep -v "^$"
acl SSL_ports port 443 http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost manager http_access deny manager http_access allow localhost include /etc/squid/conf.d/*.conf http_access deny all http_port 3128 coredump_dir /var/spool/squid refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern \/(Packages|Sources)(|\.bz2|\.gz|\.xz)$ 0 0% 0 refresh-ims refresh_pattern \/Release(|\.gpg)$ 0 0% 0 refresh-ims refresh_pattern \/InRelease$ 0 0% 0 refresh-ims refresh_pattern \/(Translation-.*)(|\.bz2|\.gz|\.xz)$ 0 0% 0 refresh-ims refresh_pattern . 0 20% 4320
Proxy All
/etc/squid/cond.d/proxy.conf
http_port 80 transparent http_access allow all visible_hostname proxy # http_port 8000 # access_log /var/log/squid/access.log squid
~/.bashrc:
export HTTP_PROXY=http://10.0.0.4:8000/ export HTTPS_PROXY=http://10.0.0.4:8000/ export http_proxy=http://10.0.0.4:8000/ export https_proxy=http://10.0.0.4:8000/
Domain Blacklist
acl domain_blacklist dstdomain "/etc/squid/domain_blacklist.txt" http_access deny all domain_blacklist
Warning: Add these entries before the first http_access allow statement that allows access to users or clients.
Create the /etc/squid/domain_blacklist.txt file and add the domains you want to block. For example, to block access to example.com including subdomains and to block example.net, add:
.example.com example.net
Restart or reload squid:
systemctl restart squid # or systemctl reload squid
ref: [1]
Run Squid
After editing squid.conf to your liking, run Squid from the command line TWICE:
% /usr/sbin/squid -z % /usr/sbin/squid
Check in the cache.log (/usr/local/squid/var/logs/cache.log) that everything is all right.
Once Squid created all its files (it can take several minutes on some systems), test it with echoping or a regular Web client. By default, your Squid will run on port 3128. See the Squid FAQ for more details.
Once you have Squid working from the command line, tell your Unix to start Squid at startup (it depends heavily on the Unix you use, you'll typically have to modify something in a /etc/rc_something).
CentOS Quick Start
The CentOS 5.5 'squid' package comes preconfigured. For squid to start the server needs to have a static IP address and a resolvable hostname (/etc/hosts is fine). By default only localhost is allowed to access the proxy. To allow everyone add 'http_access all' before the 'http_access deny all' line.
http_access all
Default CentOS 5.5 /etc/squid/squid.conf:
acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 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 http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost http_access deny all icp_access allow all http_port 3128 hierarchy_stoplist cgi-bin ? access_log /var/log/squid/access.log squid acl QUERY urlpath_regex cgi-bin \? cache deny QUERY refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 acl apache rep_header Server ^Apache broken_vary_encoding allow apache coredump_dir /var/spool/squid
Quick Start
Squid 2.5 Quick Start Guide (Visolve)
keywords
squid caching proxy