I've already wrote about setting up a Linux transparent squid proxy system. However I'm getting lots of questions about Squid basic installation and configuration:
How do I install Squid Proxy server on CentOS 5 Liinux server?
Sure Squid server is a popular open source GPLd proxy and web cache. It has a variety of uses, from speeding up a web server by caching repeated requests, to caching web, name server query , and other network lookups for a group of people sharing network resources. It is primarily designed to run on Linux / Unix-like systems. Squid is a high-performance proxy caching server for Web clients, supporting FTP, gopher, and HTTP data objects. Unlike traditional caching software, Squid handles all requests in a single, non-blocking, I/O-driven process. Squid keeps meta data and especially hot objects cached in RAM, caches DNS lookups, supports non-blocking DNS lookups, and implements negative caching of failed requests. Squid consists of a main server program squid, a Domain Name System lookup program (dnsserver), a program for retrieving FTP data (ftpget), and some management and client tools.
Install Squid on CentOS / RHEL 5
Use yum command as follows:
# yum install squid
Output:
Loading "installonlyn" plugin Setting up Install Process Setting up repositories Reading repository metadata in from local files Parsing package install arguments Resolving Dependencies --> Populating transaction set with selected packages. Please wait. ---> Package squid.i386 7:2.6.STABLE6-4.el5 set to be updated --> Running transaction check Dependencies Resolved ============================================================================= Package Arch Version Repository Size ============================================================================= Installing: squid i386 7:2.6.STABLE6-4.el5 updates 1.2 M Transaction Summary ============================================================================= Install 1 Package(s) Update 0 Package(s) Remove 0 Package(s) Total download size: 1.2 M Is this ok [y/N]: y Downloading Packages: Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Installing: squid ######################### [1/1] Installed: squid.i386 7:2.6.STABLE6-4.el5 Complete!
Squid Basic Configuration
Squid configuration file located at /etc/squid/squid.conf. Open file using a text editor:
# vi /etc/squid/squid.conf
At least you need to define ACL (access control list) to work with squid. The defaults port is TCP 3128. Following example ACL allowing access from your local networks 192.168.1.0/24 and 192.168.2.0/24. Make sure you adapt to list your internal IP networks from where browsing should be allowed:
acl our_networks src 192.168.1.0/24 192.168.2.0/24
http_access allow our_networks
Save and close the file. Start squid proxy server:
# chkconfig squid on
# /etc/init.d/squid start
Output:
init_cache_dir /var/spool/squid... Starting squid: . [ OK ]
Verify port 3128 is open:
# netstat -tulpn | grep 3128
Output:
tcp 0 0 0.0.0.0:3128 0.0.0.0:* LISTEN 20653/(squid)
Open TCP port 3128
Finally make sure iptables is allowing to access squid proxy server. Just open /etc/sysconfig/iptables file:
# vi /etc/sysconfig/iptables
Append configuration:
-A RH-Firewall-1-INPUT -m state --state NEW,ESTABLISHED,RELATED -m tcp -p tcp --dport 3128 -j ACCEPT
Restart iptables based firewall:
# /etc/init.d/iptables restart
Output:
Flushing firewall rules: [ OK ] Setting chains to policy ACCEPT: filter [ OK ] Unloading iptables modules: [ OK ] Applying iptables firewall rules: [ OK ] Loading additional iptables modules: ip_conntrack_netbios_n[ OK ]
Client configuration
Open a webbrowser > Tools > Internet option > Network settings > and setup Squid server IP address and port # 3128.
See also
You may find our previous squid tips useful:
Squid Security and blocking content Related Tips- Squid content filtering: Block / download of music MP3, mpg, mpeg, exec files
- Squid deny users accessing a website
- Squid Proxy Server Limit the number of simultaneous Web connections from a client with maxconn ACL
Squid Authentication Related Tips- Howto: Squid proxy authentication using ncsa_auth helper
- Squid NTLM authentication configuration using ntlm_auth
- Configure squid for LDAP authentication using squid_ldap_auth helper
Squid Other Tips- Linux: Setup a transparent proxy with Squid in three easy steps
- Linux Iptables allow SQUID proxy incoming client request
- Enable permissive mode for SELinux troubleshooting purpose
- Benchmarking squid and other caching proxy servers
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- Howto: Squid proxy authentication using ncsa_auth helper
- Squid NTLM authentication configuration using ntlm_auth
- Configure squid for LDAP authentication using squid_ldap_auth helper
Squid Other Tips- Linux: Setup a transparent proxy with Squid in three easy steps
- Linux Iptables allow SQUID proxy incoming client request
- Enable permissive mode for SELinux troubleshooting purpose
- Benchmarking squid and other caching proxy servers
Featured Articles:
- 20 Linux System Monitoring Tools Every SysAdmin Should Know
- 20 Linux Server Hardening Security Tips
- Linux: 20 Iptables Examples For New SysAdmins
- My 10 UNIX Command Line Mistakes
- 25 PHP Security Best Practices For Sys Admins
- The Novice Guide To Buying A Linux Laptop
- Top 5 Email Client For Linux, Mac OS X, and Windows Users
- Top 20 OpenSSH Server Best Security Practices
- Top 10 Open Source Web-Based Project Management Software
Share this with other sys admins!
Facebook it - Tweet it - Print it -
We're here to help you make the most of sysadmin work. So, subscribe!
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We're here to help you make the most of sysadmin work. So, subscribe!
{ 55 comments… read them below or add one }
i need linux el e 5 ,how to configure cui mode in
example el 4 netconfig ip ,subnet,gateway
but same command not working in el 5 kindly send to me command
Hi,
I just need to use Squid as a cache for Apache’s requests, not for any filtering or such. Is there anyway I can set it up on CentOS?
Thanks!
thanks for the tutorial.
Now, I got everything working. I am trying to browse google.com using newly configure proxy. I get the below error
“The requested URL could not be retrieved”
Access Denied.
How can I go about this? Thank you.
“-A RH-Firewall-1-INPUT -m state –state NEW,ESTABLISHED,RELATED -m tcp -p tcp –dport 3128 -j ACCEPT ”
I appended this to last of Iptables before COMMIT but when restarting iptables giving error on line 18( same line no. where I entered above lines
Please suggest
How to set up reverse squid proxy server2.6 on CentOS
how to install Squid reverse proxy2.6 on CentOS
how to install and configure reverse squid proxy for caching images for a long time and please explain refresh_pattern of squid and how to use it in Reverse Squid Proxy.
iam shankar kumar from bangalore. i have problem in dansgaudian problem how to configure dansguardian with squid and how to block downloading and uploding and some websites i want to block
Hello everybody,
Can any body tell me how to block or restrict web sites via squid i386 7:2.6.STABLE6-4.el5 and is it possible to enable content filtering in squid if yes please tell me the steps to.
Thanking You
Ananda Bhattacharjee.
ananda.bhattacharjee@gmail.com
how to install squid guard on centos? how to block all external ip and allow some specific one from network?
i want a brief method to install squid on CentOS 4.3 final….with trouble shooting..send me e books or physical magazine to my home address.Madina Mobiles Chowke Farooq-e-Azam Peco road link Multan road Lahore Pakistan.
Hi!I m Ritesh,
I just want to know what are the proceedures to configure transparent suqid proxy server.can anyone help?
Hello, I get an error when I tried to do the command /etc/init.d/iptables restart, here was the output I received:
[root@andydaykin ~]# /etc/init.d/iptables restart
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: mangle filter [ OK ]
Unloading iptables modules: [ OK ]
Applying iptables firewall rules: iptables-restore: line 1 failed
[FAILED]
same problem here
Hello Sir,
I am rabi from orissa.first time i am installing linux and squid. plz give me details how to install and configure squid in linux server.
Plz tell me how to install squid in red hat ver5.
hello,
red hat proxy use3128 port , is it tcp or udp port?
i need 2 block particular websites on Konqueror browser ,,,squid server working fine but Konqueror not supporing,it blocks all website instead of few web sites, pls help….
Hi
Grand THNX for the tutorial.
But further to i´d like to use Squid as a cache for different requests, not only for filtering. How can I set it up or any URL how to do that?
Thnx
Hi! i need patches to install this programme’s but on the squidy
I want to block some websites . What are the configuration on Redhat Linux 4 squid file?
Sir,
I want to run to IP in my network one for broad band and second for RF connetivity.
Please tell me what i have to do on linux server 5.0.
Plz responce me soon.
Thanks & Regards
sir,
I am making a squid proxy server.but a error given when i execute a command service squid start and error is
starting squid: /etc/init.d/squid: line 53: 6522.aborted $ squid_opts>>/var/log/squid/squid.out2>&1 [failed]
plz solve my problem early
Thanks & Regards
Hello
Check permissions on cache directory. The premissions should be read and write
I want to block some websites . What are the configuration on Redhat Linux 4 squid file?
Hello can anyone explain about squid in detail & how to configure in linux
plg send me sharing in internet linux&window
when i try to start squid services i got the error
init_cache_dir /var/spool/squid… /etc/init.d/squid: line 54: 5415 Aborted $SQUID -z -F -D >>/var/log/squid/squid.out 2>&1
Starting squid: /etc/init.d/squid: line 53: 5416 Aborted $SQUID $SQUID_OPTS >>/var/log/squid/squid.out 2>&1
[FAILED]
can anyone help me out…..
pls some one send me the full guide of Red hat enterprise Linux 5. coz i’ll try it several times but i cant manage it
MY SERVER IS RUNNING RHEL-5 .I HAVE CONFIGURED SQUID PROXY SERVER IN RHEL-5. THE DNS SERVER IP IS PINGING.AND GATEWAY ALSO PING . BUT ANY ONE DOMAIN SERVER NOT PING IN MY SERVER. THE ERROE MESSAGE IS UNKNOWN HOST http://WWW.GOOGLE.COM.
PLEASE GIVE ME THE SOLUTION
WITH REGARDS
R.PALANIVEL
CHENNAI
This method really workable….I had done by this and its working properly….
i install all redhat 5 series cds
what is the next setup of install squid proxy server
i required some sites are denayed
Small Mistake Then (55) line missing
Install Squid on CentOS / RHEL 5
Use yum command as follows:
Output:
Loading “installonlyn” plugin
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
Parsing package install arguments
Resolving Dependencies
–> Populating transaction set with selected packages. Please wait.
—> Package squid.i386 7:2.6.STABLE6-4.el5 set to be updated
–> Running transaction check
Dependencies Resolved
=============================================================================
Package Arch Version Repository Size
=============================================================================
Installing:
squid i386 7:2.6.STABLE6-4.el5 updates 1.2 M
Transaction Summary
=============================================================================
Install 1 Package(s)
Update 0 Package(s)
Remove 0 Package(s)
Total download size: 1.2 M
Is this ok [y/N]: y
Downloading Packages:
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing: squid ######################### [1/1]
Installed: squid.i386 7:2.6.STABLE6-4.el5
Complete!
Squid Basic Configuration
Squid configuration file located at /etc/squid/squid.conf. Open file using a text editor:
# vi /etc/squid/squid.conf
At least you need to define ACL (access control list) to work with squid. The defaults port is TCP 3128. Following example ACL allowing access from your local networks 192.168.1.0/24 and 192.168.2.0/24. Make sure you adapt to list your internal IP networks from where browsing should be allowed:
acl our_networks src 192.168.1.0/24 192.168.2.0/24
http_access allow our_networks
http_access allow all
Save and close the file. Start squid proxy server:
# chkconfig squid on
# /etc/init.d/squid start
Output:
init_cache_dir /var/spool/squid… Starting squid: . [ OK ]
Verify port 3128 is open:
# netstat -tulpn | grep 3128
Output:
tcp 0 0 0.0.0.0:3128 0.0.0.0:* LISTEN 20653/(squid)
Open TCP port 3128
Finally make sure iptables is allowing to access squid proxy server. Just open /etc/sysconfig/iptables file:
# vi /etc/sysconfig/iptables
Append configuration:
-A RH-Firewall-1-INPUT -m state –state NEW,ESTABLISHED,RELATED -m tcp -p tcp –dport 3128 -j ACCEPT
Restart iptables based firewall:
# /etc/init.d/iptables restart
Output:
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: filter [ OK ]
Unloading iptables modules: [ OK ]
Applying iptables firewall rules: [ OK ]
Loading additional iptables modules: ip_conntrack_netbios_n[ OK ]
Client configuration
Open a webbrowser > Tools > Internet option > Network settings > and setup Squid server IP address and port # 3128.
I have configured a squid server in the college. The client nodes are also configured in rhel 5. But they are facing problem while logging in with gmail and yahoo. But at the same time the windows clients are accessing gmail as well as yahoo. Is there any problem with the Mozilla 3 beta 5 version or is there any other problem ? Please help me to solve this problem.
how can i activate squid for 5 ips i have ?
Sir,
Thank for this tutorial … its very2 good . Good Luck !
i wanna know how to configure the proxy server on linux os?
how to configure dhcp server in centos linux…
Sir ,
I wanna know how to configure Squidguard 1.2 in redhat el5 ?
I am Ferdaus. I want to know why IP Tables do not save.
hi im zjhack and im using centos5. i wonder how to use squid for site restriction. i want to restrict some site and allow only the sites that my cousin can use to their studies..
pls help me thx
zjhack
How about solving this error?
Error: the proxy server (Squid) is not configured to allow SSL tunnel to port 80.
To fix the problem please find and comment the following line in the Squid
configuration file (squid.conf):
http_access deny CONNECT !SSL_ports
hi
i want learn more squid proxy server.
i want learn how to install squid.
and how to work on them
hi
i want step by step configuration of squid proxy server in redhat linux 5.
This command did not work and I was unable to view even http://www.google.com also.
[root@sys1 ~]# service iptables restart
Applying iptables firewall rules: iptables-restore: line 1 failed
[FAILED]
[root@sys1 ~]# cat /etc/sysconfig/iptables
-A RH-Firewall-1-INPUT -m state –state NEW,ESTABLISHED,RELATED -m tcp -p tcp –dport 3128 -j ACCEPT
[root@sys1 ~]#
What shoud I do now??
i cont intall squid my system.. wat is the main problem….
Thank you so much for such a clear and simple set of instructions.
This REALLY made my day.
Got it all installed and up and running in no time.
Thanks.
thank you so much,,,,,,,,,,,,
for give easy ways of understanding,,,,,,,,,,,,,,,,,,,,,
how to block some site in our network with the help of squid.
how to put webaddress in squid.conf ?
how to give special host permission for some machine for login gmail.com ?
can u help me
Hello,
I have installed Squid Proxy server( as per the procedure given on your website) for internet access in our LAN. But after configuring IE for using proxy server, the users are not able to get access to Internal SAP Servers. Tried with option “Bypass Proxy for local ..” but didnt work.
Can anyone help?
hello sir
can please help me i have one public ip address i want share in different private ip in redhat 5.0 linux how i do it please help me and also i block some websit
my public ip is 210.212.11.130 and my private ip is 192.168.2.1-192.168.2.200
please tell me how i config dhcp,and squid
how to block particular site on squid server like facebook. All site should open by squid in network but not facebook
Just finished installing squid on my VPS. Thanks for the post.
Hello, I get an error when I tried to do the command /etc/init.d/iptables restart, here was the output I received:
[root@andydaykin ~]# /etc/init.d/iptables restart
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: mangle filter [ OK ]
Unloading iptables modules: [ OK ]
Applying iptables firewall rules: iptables-restore: line 1 failed
[FAILED]