Temukan segala yang ditawarkan Scribd, termasuk buku dan buku audio dari penerbit-penerbit terkemuka. It does not, for example, take the reader through stepbystep details of Squid installation and configuration. The objective of this manual is to explain, in as much detail as possible, every configuration parameter available in Squid. As such, the reader is required to have prior knowledge of basic Squid installation and configuration.
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Temukan segala yang ditawarkan Scribd, termasuk buku dan buku audio dari penerbit-penerbit terkemuka. It does not, for example, take the reader through stepbystep details of Squid installation and configuration.
The objective of this manual is to explain, in as much detail as possible, every configuration parameter available in Squid. As such, the reader is required to have prior knowledge of basic Squid installation and configuration. The details presented in this manual are in the nature of reference material. The next section will detail the parameters required for communication with other cache servers in the network. A quick note on interserver communication. For every such server or client , Squid configuration needs to assign a unique port number over which Squid would send requests TCP or ICP and listen for responses.
An IP address is simply the network address at which the server is running. The following network parameters are relevant to Squid configuration:. Peer cache servers and Squid hierarchy The parameters described in this section are relevant when there is a Squid hierarchy in the network i. Parameters of interest here are: number of cache servers, type of configuration which instance communicates with which instance s , defining the primary cache server, mapping of specific domains to specific cache server instances, Timeouts, specification of objects that should not be cached locally etc.
Relevant parameters covered by this section are:. Squid supports more than one Cache replacement policy. This section also touches briefly on cache interaction with disk, but that subject is covered in greater detail in the next section. Relevant parameters for this section are. Log file path names and cache directories This section describes parameters for the configuration of cache directories placement of caches in specific files and directories AND Log file placement on disk size, name, path, activity.
Log files contain runtime information relevant "successful" events as well as errors. Log files are used for system level debugging and runtime activity. Certain log file management issues, e. Support for External functions Squid has the ability to invoke certain "externally defined' functions that are NOT part of the Squid binary. Such "external" executables programs are usually placed in a contrib directory for source code distribution.
External programs are invoked by Squid through the standard fork and exec. The number of such forkable child processes for specific "external" processes can also be defined. Relevant parameters for this section are:. Tuning the Squid Cache This section describes the important parameters that determine Squid cache performance. Notable among them are: Object refresh algorithm, size of the header and body for both reply and request, policy for aborting server connections when client closes connection etc.
Relevant parameters are described below:. Proper setting of timeout values is critical to optimal Squid performance. Relevant parameters for timeout settings are listed here. Access controls Access control settings are among the most important features of Squid. You can configure Squid to set filters for various entities and at different granularities e.
The relevant parameters are described below:. Administrative parameters The parameters in this section allow the Squid admin to specify, for example, which users and groups have the right to run Squid , what host name should be displayed while displaying errors, which users have the authority to view Cache activity details, etc.
Relevant registration parameters are described by:. Httpdaccelerator options Squid can act as a load balancer or load reducer for a particular webserver. Generally squid not only keeps clients happy but also the web servers by reducing load on server side. Some cache servers can act as web servers or vice versa. These servers accept requests in both the standard webrequest format where only the path and filename are given , and in the proxyspecific format where the entire URL is given. The Squid designers have decided not to let Squid to be configured in this way.
This avoids various complicated issues, and reduces code complexity, making Squid more reliable. All in all, Squid is a web cache, not a web server.
By adding a translation layer into Squid, we can accept and understand web requests, since the format is essentially the same. The additional layer can rewrite incoming web requests, changing the destination server and port.
This rewritten request is then treated as a normal request: the remote server is contacted, the data requested and the results cached. This lets Squid to pretend to be a web server, rewriting requests so that, they are passed on to some other web server.
For Transparent caching, Squid can be configured to magically intercept outgoing web requests and cache them. Since the outgoing requests are in webserver format, it needs to translate them to cacheformat requests. Transparent redirection is prohibited by internet standard 5 "Internet Protocol". And HTTP assumes no transparent redirection is taking place. This section allows various configurations related to the accelerator mode and the transparent mode.
Miscellaneous As the title suggests, this section covers parameters that could not be explicitly bundled in with any of the previous categories. Examples of features covered here are: Limiting the growth of log fils. Displaying customized information to clients upon error conditions or access denial.
Defining memory pools for Squid. Network management by enabling SNMP. Coordination with neighbor caches by enabling WCCP and Directing the requests either to the origin server or to the neighbor cache. The relevant parameters are:. This is useful when bandwidth charges are in place, if we want to reduce bandwidth usage for web traffic. Delay Pools can do wonders when combined with ACLs.
These tags permit us to limit the bandwidth of. Delay behavior is selected by ACLs low and high priority traffic, staff Vs students or student Vs authenticated student or so on. In ISPs, delay pools can be implemented in a particular network to improve the quality of service. To enable this, Squid needs to be configured with the enabledelaypools option.
Glossary The Glossary provides a general explanation for various terms used in this guide. Multiple socket addresses can be specified. There are three forms: port alone, hostname with port, and IP address with port. If hostname or IP address is specified, then Squid binds the socket to that specific address. Most likely, there is no need to bind to a specific address, so the port number alone can be used.
If Squid is to be run in accelerator mode, then it should listen on port 80 also, or instead. Example Give the port number in which you want squid to listen to http client requests.
However this option cannot be used to override IP address Caution Before changing the port number, make sure no application in your box is running in the same port. To disable "0" is used. ICP is a protocol used for communication among squid caches. ICP is primarily used within a cache hierarchy to locate specific objects in sibling caches. Squid also supports ICP via multicast. Example The port number is given in which squid has to send and receive ICP queries from neighbor caches.
Caution Before changing this port number, make sure no application in the box is running in the same port.
Multicast is essentially the ability to send one IP packet to multiple receivers. Multicast is often used for audio and video conferencing systems. ICP replies are always sent via unicast, so this option does not affect whether or not you will receive replies from multicast group members.
Default none By default, Squid doesn't listen on any multicast groups. It is better to let the OS select a suitable address. The first field is the hostname or IP of the cache that is to be queried. The second field indicates the type of relationship. The fifth field can contain zero or more keywords. Here are the detailed explanations on each field.
This option plays an important role in deciding neighbor selection. The weight must be an integer. The default weight is 1, larger weights are favoured more. We do not accept ICP replies from random hosts. So you must configure other group members as peers with the multicastresponder option below.
It is obvious to have doubt about the ICP port specified in, while using this option. Squid does not care what digit has been given in the ICP port when noquery is specified.
Using any number is fine. It is typically handled by inetd as an internal process and simply "echoes" back what has been sent it. Since option "noquery" specified, port "7" is there so that if peer is queried, Squid gets an answer and not declares peer as dead and therefore stop using it.
Port 7 is used when Squid has a nonICP peer but still want to query it before sending requests there noquery not specified. Simply adding default to a parent does not force all requests to be sent to that parent.
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