Squid is a caching and forwarding web proxy. It is most often used in conjunction with a traditional LAMP stack (Linux, Apache, MySQL, PHP), and can be used to filter traffic on HTTP, FTP, and HTTPS, and increase the speed (thus lower the response time) for a web server via caching.
Pre-Flight Check
These instructions are intended specifically for installing Squid on a single CentOS 7 node.
I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.
Step #1 Install Squid
First, clean-up yum:
yum clean all
As a matter of best practice we’ll update our packages:
yum -y update
Installing Squid and related packages is now as simple as running just one command:
yum -y install squid
Configure Squid to Start on Boot
And then start Squid:
systemctl start squid
Be sure that Squid starts at boot:
systemctl enable squid
To check the status of Squid:
systemctl status squid
To stop Squid:
systemctl stop squid
To access squid settings access : /etc/squid/squid.com
My basic config:
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 # Uncomment and adjust the following to add a disk cache directory. #cache_dir ufs /var/spool/squid 10000 16 256 cache_replacement_policy heap LFUDA cache_swap_low 90 cache_swap_high 95 maximum_object_size_in_memory 100 MB cache_dir aufs /var/spool/squid 40000 16 256 cache_mem 40000 MB # Leave coredumps in the first cache dir coredump_dir /var/spool/squid # # Add any of your own refresh_pattern entries above these. #
That is all!
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