Home / server / Questions / 869157
Accepted
cherouvim
Asked: 2017-08-18 05:33:21 +0800 CST

how can I read old varnish logs?

  • 772

In /var/log/varnish/ I have some old varnish logs, produced by varnishlog which, due to logrotated, are now in gz format:

-rw-r--r--  1 varnishlog varnish 143068514 Aug 10 23:59 varnish.log.2017-08-10.gz
-rw-r--r--  1 varnishlog varnish 156373518 Aug 11 23:59 varnish.log.2017-08-11.gz
-rw-r--r--  1 varnishlog varnish 134255825 Aug 12 23:59 varnish.log.2017-08-12.gz
-rw-r--r--  1 varnishlog varnish 156992529 Aug 13 23:59 varnish.log.2017-08-13.gz
-rw-r--r--  1 varnishlog varnish 176751837 Aug 14 23:59 varnish.log.2017-08-14.gz
-rw-r--r--  1 varnishlog varnish 155948012 Aug 16 00:01 varnish.log.2017-08-15.gz
-rw-r--r--  1 varnishlog varnish 169977134 Aug 17 00:01 varnish.log.2017-08-16.gz

I've extracted those in another location and tried to view them via head/more but they look binary.

So I then tried opening them with varnishlog using either of the following parameters:

[-N filename]             VSM filename
[-r filename]             Binary file input

But that didn't work giving me:

Can't open log - retrying for 5 seconds

and:

Can't open log file (Not a VSL file:

Any idea on how can I inspect those historical logs from varnish?

p.s I use varnish-4.1.1

logging

3 Answers

  1. The error you see is due to lack of privilages. Try:

    sudo varnishlog -N <file.vsm> -d
    • 2
  2. Best Answer

    The correct way was indeed using -r but my files were corrupted due to an improper way of rotating them in a customized /etc/logrotate.d/varnish. Reverting to the default rotate method worked.

    • 0

  3. You can read the log by unzipping it with

    gunzip -c <filename.log.gz>

    Then you can read it with

    varnishlog -r  <filename.log>
    • 0