Squid Proxy Sever View logs / log files

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Q. How do I view squid proxy server log files under CentOS Linux server 5.0?


A. 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.

/var/log/squid/ log file directory

The logs are a valuable source of information about Squid workloads and performance. The logs record not only access information, but also system configuration errors and resource consumption (eg, memory, disk space). There are several log file maintained by Squid. Some have to be explicitely activated during compile time, others can safely be deactivated during.

  • /var/log/squid/access.log : Most log file analysis program are based on the entries in access.log. You can use this file to find out who is using squid server and what they are doing etc
  • /var/log/squid/cache.log : The cache.log file contains the debug and error messages that Squid generates. If you start your Squid using the default RunCache script, or start it with the -s command line option, a copy of certain messages will go into your syslog facilities. It is a matter of personal preferences to use a separate file for the squid log data.
  • /var/log/squid/store.log : The store.log file covers the objects currently kept on disk or removed ones. As a kind of transaction log it is ususally used for debugging purposes. A definitive statement, whether an object resides on your disks is only possible after analysing the complete log file. The release (deletion) of an object may be logged at a later time than the swap out (save to disk).

How do I view Squid Log files / logs?

You can use standard UNIX / Linux command such as grep / tail to view log files. You must login as root or sudo command to view log files.

Display log files in real time

Use tail command as follows:
# tail -f /var/log/squid/access.log
$ sudo tail -f /var/log/squid/access.log

Search log files

Use grep command as follows:
grep 'string-to-search' /var/log/squid/access.log

View log files

Finally you can use text editor such as vi to view log files:
# vi /var/log/squid/access.log

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.


24 comment

  1. hi ,
    i m a new squid user, i m getting all d loged in information of users through psacct services n various commands, but what i m really searching 4 is the particular users downloaded dat information while using services of internet via SQUID server, please help me out with dis .

    thanking in advance
    Pradeep Singh

  2. Thanks for this information… Cool one, and I have a doubt in this that if we need to browse something that is in the blocked list,I often need to delete that entry in that list. Is the any other way i can do this without deleting the entry in the file squidblock.acl , can we access those sites which are blocked….

  3. Hello all, I have configure a squid at ubuntu, for 3 or 4 days it works perfect, but after that it dont work any more, it give many errors at the log file
    ie: TCP_MISS/504
    TCP_MISS/302 and others

    but I discover that if I make a request to the squit proxy using IP and not the domain name it works

    so if I need to navigate on google.com the squit don’t work, but the google IP are (one of them) if I put it works, I like to know why this is happening, what can be wrong at my squid.conf file ?.

    thanks for any help in advance

  4. plz tell mee….

    how to maintain users downloaded information at server’s side………. in a wire less network….

    in detail ……. im doing a pjct on this…

  5. This is how we get the time stamp corrected
    perl -pe ‘s/[\d\.]+/localtime($&)/e’ /var/log/squid/access.log > /tmp/access.log

  6. OK this is what I do,

    tail -f /var/log/squid/access.log | grep [ipaddress_of_a_client_workstation]

    Then it only shows the webpages that client_workstation is accessing, this is good for client surveillance.

    How can I save this to a file? I mean, if I’m not in the office, the Proxy should save the addresses that client went throughout the day. And I review them at night.

    How do you do that? Thanks.

  7. is there any log maintained for the EMail access through squid. if yes where it get the email id and access time??????

  8. plzzz. can anyone let me know except proxy what are the other work of squid on linux server………….

    Thanks and Regards

    Mukesh Chaudhary

    1. You can block Websites, Block downloading, Restrict users to internet, Make users Authenticate to use internet, Surveillance the users net using, In short you can control internet using at every side.

  9. Hi i need a script to generate the report from the squid log file which should display the ip of the visitor. web response sites accessed and denied,etc.

  10. i get squidview and will do some tests,actualy if i need make a check in a users, do something like:
    tail -f /var/log/squid/access.log |grep ‘username’
    or to print only desired columns
    tail -f /var/log/squid/access.log | awk ‘{print $3,$5,$7}’

  11. can anybody help to make squid gud speed.

    iam having solaris oracle 11 and squid proxy server 3.1

    plz help me out
    to save my position


  12. We have enabled squid proxy server and I want to capture the logs in different place for now it is /var/squid/log I want to capture it in different file system.

    How do I do that ? thanks

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