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A proxy server is a computer which sits between two endpoint devices and acts as an intermediate device. When the client computer requests a resource from the server, it may be a file or a web page, the request is sent to the proxy server first. The proxy server then sends the request to the destination server and obtains the resource sent by the server. Once the resource is obtained by the proxy server, it sends the resource to the client machine. The use of a proxy server is that it can cache the resource, for example if a website is accessed frequently from a proxy server, it's likely that the proxy server will have the content of the site in its cache, it can now serve the webpage directly to the user. A proxy server can be used to facilitate security, administrative controls and caching services. Proxy servers can also be used for anonymity as whenever obtaining a resource from a server, proxy server uses its own IP address rather than the client's IP address.
Jan 19, 2015 In this article we have discuss about Squid (Transparent) Proxy Server installation and configuration on RHEL 6/5, CentOS 6/5, Scientific Linux 6/5 and Oracle Linux 6/5. Before knowing Transparent Proxy Server first of all we know about Proxy Server. Proxy servers are used to share an Internet connection with clients. A Proxy Server can be configured. May 07, 2019 When you want your proxy settings to persist globally, for every user account on your server, you can add the proxy environment variables to the default profile script. The default profile is applied every time a user creates a new session, and it runs prior to the user’s profile. Jun 01, 2018 Squid is a proxy/cache application with a variety of configurations and uses. This guide will cover using Squid as an HTTP proxy. Please note that unless you follow the last section of the guide Anonymizing Traffic, this will not anonymize your traffic to the outside world, as your originating IP address will still be sent in the X-Forwarded-For header. Nov 12, 2007 Because there are so many messed up tings on here right now, firefox will onyl work with my proxy server if i put its IP directly into firefox but not if i put its IP into the system proxy settings and then point firefox at that. Httpd refuses to serve up any kind of documen apart from the test page randomly and even then i sometimes get a 403.
Squid Proxy is an open source caching proxy for the web. It supports many protocols such as HTTP, HTTPS, FTP and more. It improves the response time and reduces bandwidth by caching and reusing the frequently accessed web pages and files. In this tutorial we will learn to install Squid Proxy on CentOS 7. We will also learn about some basic configuration which can be done on Squid caching server.
Requirements
Squid does not have any minimum hardware requirements, but the amount of RAM may vary according to the users accessing the Internet through your proxy and the objects stored in the cache. To follow this tutorial you will need a CentOS 7.x server with root access on it. If you are logged in as non root user, run
sudo -i to switch to root user. You can also use sudo command before all the administrative commands to run them as root user.
Installing Squid
Before installing any packages, it is recommended to update the system and packages using the following command.
Now you will need to install EPEL repository to your system as Squid is not available in default yum repository. Run the following command to install EPEL repository in your server.
Now you can install Squid Proxy using the following command.
Once you install Squid, you can start the program immediately using the following command.
To automatically start Squid at boot time you can run the following command.
To view the status of Squid service, run the following command.
You will see an output similar to this.
To view the available options with
squid command, run the following command.
You will see output similar to this.
To view the Squid version and configuration options, run the following command.
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You will likely see the following output. Aol for mac os x 10.4.
The main configuration file for Squid proxy can be found on
/etc/squid/squid.conf . You can now setup your browser to use the proxy server you just created. For Internet Explorer and Google Chrome, you can go to Control Panel > Internet Options. In the Connections tab, click on LAN settings and enter your proxy server IP address and port 3128. You will see that you are now browsing the internet through the proxy server.
By default the Squid proxy server is configured to connect to a local network only, if you are not into the local network of the proxy server, you will see an error saying 'The proxy server is refusing connections'. If you are getting these kind of errors, then you will need to configure Access Control Lists or ACL into the squid configuration file.
You can check the error logs of Squid using the following command.
You will see an output similar to shown below.
Configuring Squid
Mac os x 10.5 download for pc free. Squid can be easily configured by editing the global configuration file
/etc/squid/squid.conf . To edit the configuration file run the following command.
You can use any editor of your choice, in this tutorial we will be using nano editor. If you don't have nano editor installed, you can run
yum -y install nano command to install nano editor.
A minimum sample configuration file will look like this.
Allow IP Address to Use the Internet Through Your Proxy Server
To allow a range of IP address to use the Internet through your proxy server. You can add a new ACL entry. Squid supports CIDR notations. Consider an example, if you want to allow a range of IP address from 110.220.330.1 to 110.220.330.255 then you can make the following entry in Squid configuration file under the list of ACLs.
Your list of ACLs will finally look like this.
For changes to take effect you will need to restart your Squid server, use the following command for same.
Allow a Specific Port for HTTP Connections
By default Squid only consider very few ports as safe ports and allow connections through them. The ports which are allowed by default are:
The ports which are not listed above will not be accessed through the proxy. You can add a Port into the list of
Safe_ports by modifying the list of ACLs for ports. For example it you want to allow port 168 to be accessed through the proxy server you can add the following ACL entry for this.
For changes to take effect you will need to restart your Squid server, use the following command for same.
Using Basic Authentication with Squid
If you want to authenticate the user before they can use your proxy server, you can do it using the basic authentication feature available in Squid proxy. Although Squid supports many kind of authentication but basic authentication is very easy to set up.
First of all you will need to install
httpd-tools , which comes with a tool htpasswd which we will use to create an encrypted password file. Run the following command to install httpd-tools .
Now create a new file and provide the ownership to squid daemon so that it can access it. Run the following command for same.
Now you can add a new user to the password file using the
htpasswd tool. In this tutorial we will be creating an example user pxuser . You can replace pxuser with anything you like. Run the following command to create a new user using htpasswd tool.
It will ask for the new password twice, provide the password and you will see following output.
By default htpasswd uses MD5 encryption for the password, hence your password will be stored in MD5 hash.
As we have our password file ready, you can now edit the squid configuration file using the following command.
Add the following lines into the configuration file under the access control lists of ports.
Write the changes to the file and exit from editor. Reload the Squid daemon using the following command.
Now if you will try to use the proxy server, it will ask you for authentication. Provide your username and password and you will be able to use the proxy server. Unauthenticated user will be shown an error page.
Blocking Websites
You can easily block a single or a list of websites from the users. Using a separate file for the list of websites to be blocked is a good way to manage the blocked websites. Create a new file to store the list of websites to be blocked using your favorite editor.
Now enter the list of sites you want to block. One website per line.
Save the file and exit the editor. In this example we used some example websites, you can put a list of actual websites you wish to block. Now open the Squid configuration file again using the following command.
Enter the following lines under
acl list and http_access list.
Create Centos 6 Proxy Server For Os Xbox One
Write the changes to the file and exit from editor. Reload the Squid daemon using the following command.
Now if you will try to access the blocked sites, you will get an access denied message from Squid.
Changing Squid Port
You can easily change the port on which squid listens to. Edit the configuration file using the following command.
Scroll down to find the following lines into the file.
Now change the
http_port from 3128 to any port you want. Make sure that no other service is using the port which you will use for Squid. Now restart the Squid daemon and you will see that the changes are in effect.
Conclusion
In this detailed tutorial we learned how to install Squid proxy server on CentOS 7 systems. You can now easily setup a basic installation of Squid. You also learnt about some basic configuration of Squid proxy server inclusding enabling basic authentication.
Connecting to a web proxy is fairly simple. In this doc, you'll learn how to connect to a proxy from OS X (Mac), Windows, or Linux.
OS X
In order to setup a proxy on OS X, go to your System Preferences. Next, click 'Network'. Unlock the settings by clicking on the lock and entering the credentials of an administrative account.
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Once authenticated, click 'Advanced'. This will open a popup with multiple tabs. Click the 'Proxies' tab. Tick 'Web Proxy (HTTP)' to configure a proxy for HTTP traffic. Enter the proxy server IP address (or hostname) and the port that the proxy is running on, and if needed, a username and password.
Click 'OK' to save the settings and close the popup. Then, click 'Apply'; your proxy has been configured.
Windows
The setup of a proxy on Windows is a bit more complicated, as applications use individual settings for proxy usage. For example, if you setup application #1 to use a proxy, application #2 might not use it. For this reason, you should refer to the application's manual to find out how to configure a proxy. Lots of applications use the settings in Internet Explorer, though. If you set a proxy in Internet Explorer, then Google Chrome, for example, will also use it. Again, this depends on the application.
In order to configure a proxy in Internet Explorer, open Internet Explorer and click on the 'Tools' button. Then, click 'Internet Options'. A number of tabs will appear. Click the 'Connections' tab and find 'LAN Settings'. Tick the 'Use a proxy server for your LAN' checkbox to be able to configure a proxy. Type the IP address (or hostname) of the proxy server in the address field, and the port the proxy is running on in the port field.
Click 'OK' several times. Once you're back in Internet Explorer, the proxy has been setup.
Linux
As there are many Linux distributions, you will need to refer to a manual for the specific one you're using. If your distribution is not in this list, please search on the web for instructions.
UbuntuCreate Centos 6 Proxy Server For Os X 1
On Ubuntu, you can set a proxy either from the GUI or from the command line. We will see how we can set a proxy from the command line. Open the
/etc/environment file with your favorite text editor and add the following lines:
You can set different proxies here for different protocols (HTTP, HTTPS, and FTP). You can also exclude addresses from being accessed with the proxy.
CentOSCreate Centos 6 Proxy Server For Os X Download
In order to configure a proxy on CentOS, the best way to do this is via the command line. Open the
~/.bash_profile file with your favorite editor and add the following lines:
Create Centos 6 Proxy Server For Os Xp
The
http_proxy value is the IP address or hostname and port of the proxy server. no_proxy indicates for which addresses the proxy should not be used.
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