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Getting Squid to run on SUSE Authentication and ACLs The Squid log and using sarg Transparent proxying Using the Cache Manager and squidGuard
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Getting Started with Squid on SUSE
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The SUSE installation media contain the Squid installation package; first, you need to install this in the usual way using YaST. Squid is included in the YaST installation selection Network/Server.
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Part IV Implementing Network Services in SUSE Linux
Here we assume that you are setting up Squid on a machine on your network that has adequate access to the outside world. Simply installing and starting Squid is not enough:
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root@proxy: /tmp/ # rcsquid start Starting WWW-proxy squid (/var/cache/squid)/usr/sbin/rcsquid: line 135: 14165 Aborted $SQUID_BIN -z -F >/dev/null 2>&1 - Could not create cache_dir ! failed
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Here Squid wants to create its cache directories under /var/cache/squid/, but it doesn t know how to do this because the necessary option is not set in the configuration file /etc/squid/squid.conf. At this stage, /var/cache/squid is empty. The configuration file /etc/squid/squid.conf as shipped contains a fair amount of information about the default settings and descriptions of the meanings of the various valid parameters. You need to enable the following line so that the cache directories can be created:
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# cache_dir ufs /var/cache/squid 100 16 256
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Edit the file to uncomment this line by removing the # from it.
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If you try again, you will see the same error until you also add a line like this:
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Search the file for this parameter. You will see where it is explained, but you will have to edit the file by hand and add it. Squid will not start until it knows what host name it is advertising. Now if you try again, you see that Squid is starting correctly:
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root@proxy: /tmp/ # rcsquid start Starting WWW-proxy squid done
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If you look in /var/cache/squid/, you will see that the cache directories have been created: The SUSE start script checks for their existence and creates them if necessary (so you do not need to manually run squid -z as stated in the documentation). If you now list /var/cache/squid/, you see 16 directories 00, 01, 02, . . . , 0F, each of which has 256 subdirectories 00, 01, . . . , FF. So you have a total of 4,096 directories in the cache directory structure. It is in these that Squid saves copies of the objects that it proxies. Clearly you could have changed these numbers by changing the values set in the configuration file for cache_dir. You can stop Squid (rcsquid stop), remove these directories, and change the value of the cache_dir parameter to, for example:
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cache_dir ufs /var/cache/squid 100 256 256
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If you now start Squid, you find that there are 256 directories under /var/cache/squid with 256 subdirectories each. If the rcsquid start command used earlier worked correctly, you will probably want to force Squid to start at every boot by enabling it in YaST s runlevel editor, or by using the command insserv squid.
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25 Setting Up a Web Proxy with Squid
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Squid runs by default on port 3128. This can also be changed in the configuration file (the other popular port for a proxy server is 8080). If you now go to a client machine and set the proxy settings in a browser to proxy:3128, all is still not well; you will see an error message in the browser window (see Figure 25-1).
Figure 25-1: Squid error message At least this shows that you re successfully talking to Squid, but so far Squid doesn t want to proxy for you. That is because you now need to set up at least one ACL (access control list) to refer to either the specific client or the local network and allow access. To do this, you need something similar to this in the configuration file:
acl lan src http_access allow lan
Here lan is an arbitrary name that is introduced in the first of these lines and referenced in the second. This allows access to any host in the network. Having made a change in the configuration file, you need to issue the command rcsquid reload so that the file will be reread. Now if you try to connect again from the client, you will find that you can access web sites. And in the Squid logs at /var/log/squid, you will start to see logging of that access.