.. _users_trouble:
Troubleshooting Varnish
=======================
Sometimes Varnish misbehaves or rather behaves the way you told it to
behave but not necessarily the way you want it to behave. In order for
you to understand whats going on there are a couple of places you can
check. :ref:`varnishlog(1)`, `/var/log/syslog`, `/var/log/messages`
are all good places where Varnish might leave clues of whats going
on. This section will guide you through basic troubleshooting in
Varnish.
When Varnish won't start
------------------------
Sometimes Varnish wont start. There is a plethora of possible reasons why
Varnish wont start on your machine. We've seen everything from wrong
permissions on `/dev/null` to other processes blocking the ports.
Starting Varnish in debug mode to see what is going on.
Try to start Varnish by::
# varnishd -f /usr/local/etc/varnish/default.vcl -s malloc,1G -T 127.0.0.1: 2000 -a 0.0.0.0:8080 -d
Notice the '-d' parameter. It will give you some more information on what
is going on. Let us see how Varnish will react when something else is
listening on its port.::
# varnishd -n foo -f /usr/local/etc/varnish/default.vcl -s malloc,1G -T 127.0.0.1:2000 -a 0.0.0.0:8080 -d
storage_malloc: max size 1024 MB.
Using old SHMFILE
Platform: Linux,2.6.32-21-generic,i686,-smalloc,-hcritbit
200 193
-----------------------------
Varnish Cache CLI.
-----------------------------
Type 'help' for command list.
Type 'quit' to close CLI session.
Type 'start' to launch worker process.
Now Varnish is running but only the master process is running, in debug
mode the cache does not start. Now you're on the console. You can
instruct the master process to start the cache by issuing "start".::
start
bind(): Address already in use
300 22
Could not open sockets
And here we have our problem. Something else is bound to the HTTP port
of Varnish. If this doesn't help try ``strace`` or ``truss`` or come find us
on IRC.
Varnish is crashing - panics
----------------------------
When Varnish goes bust the child processes crashes. Most of the
crashes are caught by one of the many consistency checks we have included in the Varnish source code. When Varnish hits one of these the caching
process will crash itself in a controlled manner, leaving a nice
stack trace with the mother process.
You can inspect any panic messages by typing ``panic.show`` in the CLI.::
panic.show
Last panic at: Tue, 15 Mar 2011 13:09:05 GMT
Assert error in ESI_Deliver(), cache_esi_deliver.c line 354:
Condition(i == Z_OK || i == Z_STREAM_END) not true.
thread = (cache-worker)
ident = Linux,2.6.32-28-generic,x86_64,-sfile,-smalloc,-hcritbit,epoll
Backtrace:
0x42cbe8: pan_ic+b8
0x41f778: ESI_Deliver+438
0x42f838: RES_WriteObj+248
0x416a70: cnt_deliver+230
0x4178fd: CNT_Session+31d
(..)
The crash might be due to misconfiguration or a bug. If you suspect it
is a bug you can use the output in a bug report, see the "Trouble Tickets" section in the Introduction chapter above.
Varnish is crashing - segfaults
-------------------------------
Sometimes a bug escapes the consistency checks and Varnish gets hit
with a segmentation error. When this happens with the child process it
is logged, the core is dumped and the child process starts up again.
A core dumped is usually due to a bug in Varnish. However, in order to
debug a segfault the developers need you to provide a fair bit of
data.
* Make sure you have Varnish installed with debugging symbols.
* Make sure core dumps are allowed in the parent shell. (``ulimit -c unlimited``)
Once you have the core you open it with `gdb` and issue the command ``bt``
to get a stack trace of the thread that caused the segfault.
Varnish gives me Guru meditation
--------------------------------
First find the relevant log entries in :ref:`varnishlog(1)`. That will
probably give you a clue. Since :ref:`varnishlog(1)` logs a lot of
data it might be hard to track the entries down. You can set
:ref:`varnishlog(1)` to log all your 503 errors by issuing the
following command::
$ varnishlog -q 'RespStatus == 503' -g request
If the error happened just a short time ago the transaction might
still be in the shared memory log segment. To get :ref:`varnishlog(1)`
to process the whole shared memory log just add the '-d' parameter::
$ varnishlog -d -q 'RespStatus == 503' -g request
Please see the :ref:`vsl-query(7)` and :ref:`varnishlog(1)` man pages
for elaborations on further filtering capabilities and explanation of
the various options.
Varnish doesn't cache
---------------------
See :ref:`users-guide-increasing_your_hitrate`.
Henceforth, whatever our philosopher says about Matter will apply to extension and to extension alone. It cannot be apprehended by sight, nor by hearing, nor by smell, nor by taste, for it is neither colour, nor sound, nor odour, nor juice. Neither can it be touched, for it is not a body, but it becomes corporeal on being blended with sensible qualities. And, in a later essay, he describes it as receiving all things and letting them depart again without retaining the slightest trace of their presence.483 Why then, it may be asked, if Plotinus meant extension, could he not say so at once, and save us all this trouble in hunting out his meaning? There were very good reasons why he should not. In the first place, he wished to express himself, so far as possible, in Aristotelian phraseology, and this was incompatible with the reduction of Matter to extension. In the next place, the idea of an infinite void had been already appropriated by the Epicureans, to whose system he was bitterly opposed. And, finally, the extension of ordinary327 experience had not the absolute generality which was needed in order to bring Matter into relation with that ultimate abstraction whence, like everything else, it has now to be derived. That the millionaire was genuine, ¡°in person and not a caricature,¡± as Dick put it, was evident. Both the nurse, his relative, and his wife, were chatting with him as Jeff delivered the heavy packed ball made up of the gum. 233 "I guess not," said Landor, tolerantly, as he turned[Pg 106] his horse over to his orderly; "but, anyway," he added to Ellton, "we had a picnic¡ªof a sort." Si, unable to think of anything better, went with him. The train had stopped on a switch, and seemed likely to rust fast to the rails, from the way other trains were going by in both directions. The bridge gang, under charge of a burly, red-faced young Englishman, was in the rear car, with their tools, equipments, bedding and cooking utensils. THE DEACON HAS SOME EXPERIENCES WITH THE QUADRUPED. "You are not within a mile of the truth. I know it. Look here: I believe that is Gen. Rosecrans's own cow. She's gone, and I got an order to look around for her. I've never seen her, but from the description given me I believe that's she. Who brought her here?" "Deacon, these brothers and sisters who have come here with me to-night are, like myself, deeply interested in the moral condition of the army, where we all have sons or kinsmen. Now, can't you sit right there and tell us of your observations and experiences, as a Christian man and father, from day to day, of every day that you were down there? Tell us everything, just as it happened each day, that we may be able to judge for ourselves." HAS AN ENCOUNTER WITH THE PROVOST-MARSHAL. "Wonder which one o' them is the 200th Injianny's?" said Si to Shorty. "And your mother, and Harry?" The daughter must be the girl who was talking to him now. She sat on a little stool by the fire, and had brought out some sewing. "Over at Grandturzel¡ªcan't see wot's burning from here. Git buckets and come!" These things, however, gave little concern to the worthy who commanded the Kentish division. Tyler, though an excellent blacksmith, possessed few of the qualities requisite for forming a good general. Provided there was no very sensible diminution in the number of his followers, he cared not a straw for the score or two who, after quarrelling, or perhaps fighting, withdrew in such disgust that they vowed rather to pay the full tax for ever than submit to the insolence of the rebels. One man could fight as well as another, reasoned he; and, provided he was obeyed, what mattered it by whom. Dick went and Tom came¡ªit was sure to be all one in the end. But this burst of indignation soon passed away, and upon the suggestion of the prudent Sir Robert Hailes, he sent an evasive answer, with a command that the Commons should attend him at Windsor on the Sunday following. That it was a stratagem to gain entrance to the Tower, was the opinion of several, but, after much discussion, it was decided that the man should be admitted, and that the monk should be exhibited merely to intimidate the rebels, until the result of this promised communication should be known. HoMEŮͬÐÔÁµcbcb
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