I have no idea why backend is sick

[Shibashish]

On Wed, Jul 18, 2012 at 4:55 PM, Abraham Cruz Sustaita <
abraham.sustaita at buscacorp.com> wrote:

> I have 8 servers, 7 of them are working as they supposed to be working.
> However, I have app02, and it is not working. The first problem I noticed
> was it was reporting errors even when I change the error reporting to off.
> The second problem, and the one that is give me troubles, is that after I
> reboot the server, it is not working. I have this in the log:
>
> varnishlog | grep app02
>     0 Backend_health - app02 Still healthy 4--X-R- 3 3 5 0.000488 0.000000
> HTTP/1.1 301 Moved Permanently
>     5 BackendOpen  b app02 192.168.11.42 48452 192.168.11.32 80
>     5 BackendReuse b app02
>     4 Backend      c 5 old app02
>     4 ObjHeader    c b_n: app02
>     4 TxHeader     c b_n: app02
>    37 BackendOpen  b app02 192.168.11.42 48460 192.168.11.32 80
>    37 BackendReuse b app02
>     5 BackendReuse b app02
>    20 Backend      c 5 old app02
>    20 ObjHeader    c b_n: app02
>    20 TxHeader     c b_n: app02
>    28 Backend      c 37 old app02
>    28 ObjHeader    c b_n: app02
>    28 TxHeader     c b_n: app02
>     0 Backend_health - app02 Went sick 4--X-R- 2 3 5 0.000722 0.000000
> HTTP/1.1 301 Moved Permanently
>     5 BackendReuse b app02
>    68 Backend      c 5 old app02
>    68 ObjHeader    c b_n: app02
>    68 TxHeader     c b_n: app02
>    37 BackendReuse b app02
>    75 Backend      c 37 old app02
>    75 ObjHeader    c b_n: app02
>    75 TxHeader     c b_n: app02
>   123 TxHeader     c b_n: app02
>   259 TxHeader     c b_n: app02
>   187 TxHeader     c b_n: app02
>     0 Backend_health - app02 Still sick 4--X-R- 1 3 5 0.000520 0.000000
> HTTP/1.1 301 Moved Permanently
>    67 TxHeader     c b_n: app02
>     0 Backend_health - app02 Still sick 4--X-R- 0 3 5 0.000503 0.000000
> HTTP/1.1 301 Moved Permanently
>
> But the problem is that the server is working ok. If I do wget app02 from
> varnish, it returns what it is supposed to return! But varnish says that it
> went sick... Is there anyway I can trace this?
>
> I have modified my hosts file in order to point www.domain.com to app02
> so I can do wget www.domain.com (www.domain.com is the domain I have in
> that server), and it response as it supposed:
>
> wget --server-response --spider www.domain.com
> Spider mode enabled. Check if remote file exists.
> --2012-07-18 23:53:20--  http://www.domain.com/
> Resolving www.domain.com... 192.168.11.32
> Connecting to www.domain.com|192.168.11.32|:80... connected.
> HTTP request sent, awaiting response...
>   HTTP/1.1 200 OK
>   Date: Wed, 18 Jul 2012 23:53:20 GMT
>   Server: Apache/2.2.22 (Fedora)
>   X-Powered-By: PHP/5.4.4
>   Set-Cookie: sessionToken=a73cdcde6439423231f19f7ce6870ae7; expires=Thu,
> 18-Jul-2013 23:53:21 GMT; path=/; domain=.domain.com
>   Set-Cookie: sessionToken=46560b800baa0ee9cf0f7eeea8dc1add; expires=Thu,
> 18-Jul-2013 23:53:21 GMT; path=/; domain=.domain.com
>   Set-Cookie: sessionToken=8bfa42f1782db58726ebdc500ede7705; expires=Thu,
> 18-Jul-2013 23:53:21 GMT; path=/; domain=.domain.com
>   Vary: Accept-Encoding
>   Cache-Control: no-store, no-cache, must-revalidate, max-age=0
>   Pragma: no-cache
>   Keep-Alive: timeout=15, max=100
>   Connection: Keep-Alive
>   Content-Type: text/html; charset=iso-8859-1
> Length: unspecified [text/html]
> Remote file exists and could contain further links,
> but recursion is disabled -- not retrieving.
>
>
>
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>


Show us the relevant vcl config.

Also, u can see Varnish is getting 301 but wget getting 200, so check the
config and backend again.

--
ShiB.
while ( ! ( succeed = try() ) );
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