Proxy server log file squid

Here we need to provide a title in the Block Name field. Then in the text area field, we paste the filter that we previously copied into our clipboard. At this point, we click the Verify button to ensure the filter we just created is valid or not. Once the verification is successful, we apply the configuration. In the left pane under Configure click Apply Configuration. Now after creating the filter, we need to configure the Squid server to send the access.

Note: In the following steps we have replaced xxx. First, we establish a terminal session to our Nagios XI or Nagios Core server and execute the following commands:. So now we can search for squid on the Dashboards page and see the results coming in, confirming that everything is correctly configured. Once we receive some log data we will be able to visualize that data using panels.

So we start off by adding a new row. Today, we saw how our Support Engineers configure the Nagios log server to use a proxy server. Never again lose customers to poor server speed! Let us help you. Your email address will not be published. Submit Comment. Or click here to learn more. When you visit any website, it may store or retrieve information on your browser, mostly in the form of cookies.

This information might be about you, your preferences or your device and is mostly used to make the site work as you expect it to. The information does not usually directly identify you, but it can give you a more personalized web experience. Because we respect your right to privacy, you can choose not to allow some types of cookies. The command rcsquid stop causes Squid to shut down. Terminating Squid with kill or killall can damage the cache. To be able to restart Squid, a damaged cache must be deleted.

If Squid should be loaded automatically when the system boots, use the YaST runlevel editor to activate Squid for the desired runlevels. See Section An uninstall of Squid does not remove the cache hierarchy or the log files. Setting up a local DNS server makes sense even if it does not manage its own domain. It then simply acts as a caching-only name server and is also able to resolve DNS requests via the root name servers without requiring any special configuration see Section How this can be done depends on whether or not you chose dynamic DNS during the configuration of the Internet connection.

This way Squid can always find the local name server when it starts. With static DNS, no automatic DNS adjustments take place while establishing a connection, so there is no need to change any sysconfig variables. To start Squid for the first time, no changes are necessary in this file, but external clients are initially denied access. The proxy is available for localhost. The default port is Nearly all entries begin with the lines are commented and the relevant specifications can be found at the end of the line.

The given values almost always correlate with the default values, so removing the comment signs without changing any of the parameters actually has little effect in most cases.

If possible, leave the sample as it is and insert the options along with the modified parameters in the line below. This way, the default values may easily be recovered and compared with the changes.

If you try to use the old squid. This is the port on which Squid listens for client requests. The default port is , but is also common. If desired, specify several port numbers separated by blank spaces. Here, enter a parent proxy, for example, if you want to use the proxy of your ISP.

As hostname , enter the name or IP address of the proxy to use and, as type , enter parent. For proxy-port , enter the port number that is also given by the operator of the parent for use in the browser usually Set the icp-port to 7 or 0 if the ICP port of the parent is not known and its use is irrelevant to the provider.

In addition, default and no-query may be specified after the port numbers to prohibit the use of the ICP protocol. Squid then behaves like a normal browser as far as the provider's proxy is concerned. This entry defines the amount of memory Squid can use for very popular replies. The default is 8 MB. This does not specify the memory usage of Squid and may be exceeded.

The numbers at the end indicate the maximum disk space in MB to use and the number of directories in the first and second level. The ufs parameter should be left alone.

When specifying the disk space to use, leave sufficient reserve disk space. The last two numbers for the directories should only be increased with caution, because too many directories can also lead to performance problems. These three entries specify the paths where Squid logs all its actions. Normally, nothing is changed here.

If Squid is experiencing a heavy usage burden, it might make sense to distribute the cache and the log files over several disks. If the entry is set to on , obtain readable log files. Some evaluation programs cannot interpret this, however. With this entry, mask IP addresses of clients in the log files. The last digit of the IP address is set to zero if you enter You may protect the privacy of your clients this way. With this, set the password Squid should use for the anonymous FTP login.

It can make sense to specify a valid e-mail address here, because some FTP servers check these for validity. An e-mail address to which Squid sends a message if it unexpectedly crashes. The default is webmaster. If you run squid -k rotate , Squid can rotate secured log files. The files are numbered in this process and, after reaching the specified value, the oldest file is overwritten. Usually, your own domain is entered here, so entering www in the browser accesses your own Web server.

Otherwise it adds a line to the header like. Normally, you do not need to change these values. If you have a dial-up connection, however, the Internet may, at times, not be accessible.

Squid makes a note of the failed requests then refuses to issue new ones, although the Internet connection has been reestablished. In a case such as this, change the minutes to seconds. Then, after clicking Reload in the browser, the dial-up process should be reengaged after a few seconds.

To prevent Squid from taking requests directly from the Internet, use the above command to force connection to another proxy. This might be necessary, for example, if you are using a provider that strictly stipulates the use of its proxies or denies its firewall direct Internet access. Squid provides a detailed system for controlling the access to the proxy. By implementing ACLs, it can be configured easily and comprehensively. This involves lists with rules that are processed sequentially.

ACLs must be defined before they can be used. Some default ACLs, such as all and localhost , already exist. However, the mere definition of an ACL does not mean that it is actually applied. An ACL requires at least three specifications to define it. The following are some simple examples:. For this, ACLs must be given.

In the following example, the localhost has free access to everything while all other hosts are denied access completely. In another example using these rules, the group teachers always has access to the Internet. The group students only gets access Monday to Friday during lunch time. That is, between the text. With this option, specify a redirector such as squidGuard, which allows the blocking of unwanted URLs. Internet access can be individually controlled for various user groups with the help of proxy authentication and the appropriate ACLs.

In addition, an ACL is still required, so only clients with a valid login can use the Internet:. With this, have an ident request run for all ACL-defined clients to find each user's identity. Also, an ident daemon must be running on all clients. For Linux, install the pidentd package for this purpose. For Microsoft Windows, free software is available for download from the Internet.

You should never delete access. With Unix, you can delete a file when a process has the file opened. However, the filesystem space is not reclaimed until the process closes the file. If you accidentally delete swap. If you delete the others while Squid is running, you can not recover them. The correct way to maintain your log files is with Squid's "rotate" feature.

You should rotate your log files at least once per day. The current log files are closed and then renamed with numeric extensions. If you want to, you can write your own scripts to archive or remove the old log files. The logfile rotation procedure also writes a clean swap. This allows third-party logfile management systems, such as newsyslog , to maintain the log files.

To disable access. That way, your log files are more controllable and self-maintained by your system What is the maximum size of access.

Squid does not impose a size limit on its log files. Some operating systems have a maximum file size limit, however. If a Squid log file exceeds the operating system's size limit, Squid receives a write error and shuts down.

You should regularly rotate Squid's log files so that they do not become very large. Logging is very important to Squid. In fact, it is so important that it will shut itself down if it can't write to its logfiles.

This includes cases such as a full log disk, or logfiles getting too big. You need to rotate your log files with a cron job.

From Squid N series of backups. The default is to store the same number as with access. This allows third-party logfile management systems, such as newsyslog or logrotate , to maintain the log files.

Managing log files The preferred log file for analysis is the access. For long term evaluations, the log file should be obtained at regular intervals.

Squid offers an easy to use API for rotating log files, in order that they may be moved or removed without disturbing the cache operations in progress. The procedures were described above. Depending on the disk space allocated for log file storage, it is recommended to set up a cron job which rotates the log files every 24, 12, or 8 hour.

During a time of some idleness, you can safely transfer the log files to your analysis host in one burst. Before transport, the log files can be compressed during off-peak time. On the analysis host, the log file are concatenated into one file, so one file for 24 hours is the yield.

Look into you cache manager info page to make an educated guess on the size of your log files. Keep logs unavailable unless anonymized. Most countries have laws on privacy protection, and some even on how long you are legally allowed to keep certain kinds of information.

Rotate and process log files at least once a day. Even if you don't process the log files, they will grow quite large, see My log files get very big above here. If you rely on processing the log files, reserve a large enough partition solely for log files. Keep the size in mind when processing. It might take longer to process log files than to generate them! Limit yourself to the numbers you are interested in.

There is data beyond your dreams available in your log file, some quite obvious, others by combination of different views. Here are some examples for figures to watch: The hosts using your cache. The elapsed time for HTTP requests - this is the latency the user sees. Also, medians are preferred over averages.

The requests handled per interval e. This message means that the requested object was in "Delete Behind" mode and the user aborted the transfer. This means that a timeout occurred while the object was being transferred. Most likely the retrieval of this object was very slow or it stalled before finishing and the user aborted the request.

Retrieving "lost" files from the cache "I've been asked to retrieve an object which was accidentally destroyed at the source for recovery. So, how do I figure out where the things are so I can copy them out and strip off the headers? The first field in this file is an integer file number. Then, find the file fileno-to-pathname. The usage is perl fileno-to-pathname. Can I use store. Sort of. You can use store. However, your analysis must also consider that when a cached response is removed from the cache for example due to cache replacement it is also logged in store.

To differentiate these two, you can look at the filenumber 3rd field. Any other filenumber indicates a cached response was released. Several people have asked for this, usually to feed the log into some kind of external database, or to analyze them in real-time. The answer is No. Well, yes, sorta. Using a pipe directly opens up a whole load of possible problems.

There are several alternatives which are much safer to setup and use.