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I'm trying to read log files of Varnish server in Ubuntu environment.

I actually never used Varnish before.

so...I cd to /var/log/varnish, but the folder is empty.

it tells me that I have to configure my varnish server to save logs...is that true?

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by default varnish will not log anywhere.. you have to run a command to get it to show logs

You can run the command

varnishncsa

For more info on how to use that command to write to a log instead of stdout

http://www.go2linux.org/linux/2011/05/configure-varnish-logs-varnishnsca-logrotate-and-awstats-1014

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    The most stupid name for log command that you would never guess. – Ben Affleck Nov 24 '15 at 17:55
  • I looked all over the internet for this. Not only is it a difficult name, it's also buried deep where no one can find it. – Joe Yahchouchi Oct 17 '16 at 18:50
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    You can also do service varnishncsa start – vikramaditya234 Jun 1 '17 at 3:35
  • ncsa goes back to pre-apache webserver and is the name of the log format loganalyzer.net/log-analyzer/apache-combined-log.html. I agree though it's a stupid name – Mike Aug 23 '19 at 14:01
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We could use varnishlog too, a better remembered name compared with varnishncsa.

We need run it with root privilege - sudo varnishlog, otherwise somethime it will said VSM: Could not get hold of varnishd, is it running?.

For writing log to file, we could run sudo varnishlog -w <filename>.

-w <filename>
Redirect output to file.
The file will be overwritten unless the -a option was specified.
If the application receives a SIGHUP in daemon mode the file will be reopened allowing the old one to be rotated away.
The file can then be read by varnishlog and other tools with the -r option, unless the -A option was specified. This option is required when running in daemon mode.

For reading the log file, we could run sudo varnishlog -r <filename>.

-r <filename>
Read log in binary file format from this file. The file can be created with varnishlog -w filename.

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