Per,
I appreciate your interest in this issue.
>
> Have a look at varnishlog. There might be a hint there what is going on.
> Maybe there are connectivity issues with the first backend?
>
Connectivity is fine for both hosts.
I have gone through several tests, this time with two hosts, and I
can't be confident that the load balancer is working. varnish seems to
establish a preference for one host and stick with it.
I also tried using probes, and random.
To refresh, each hosts is an apache virtual host on the same IP
address with a different host name and port number.
round robin with probes: stays with one hosts even if the weight of
the other host is the same or greater.
round robin (no probes): will cycle between hosts if one has
index.html and the other has index.cgi or no index file.
I tried clearing the browser cache, and using multiple browsers.
However all requests are from the same host. I am still wondering if
it is something to do with my environment.
I will paste some varnishlog and varnishstat data for a simple case
with two RR hosts, and no probes.
Thanks again. I'll continue to look into it.
varnishlog (2 requests): please find attached vlog.txt
varnishstatus:
0+00:14:32
theloin
Hitrate ratio: 0 0 0
Hitrate avg: 0.0000 0.0000 0.0000
11 0.00 0.01 Client connections accepted
35 0.00 0.04 Client requests received
0 0.00 0.00 Cache hits
0 0.00 0.00 Cache hits for pass
0 0.00 0.00 Cache misses
35 0.00 0.04 Backend connections success
0 0.00 0.00 Backend connections not attempted
0 0.00 0.00 Backend connections too many
0 0.00 0.00 Backend connections failures
17 0.00 0.02 Backend connections reuses
35 0.00 0.04 Backend connections recycles
0 0.00 0.00 Backend connections unused
1 . . N struct srcaddr
0 . . N active struct srcaddr
2 . . N struct sess_mem
1 . . N struct sess
0 . . N struct object
2 . . N struct objecthead
3 . . N struct smf
0 . . N small free smf
3 . . N large free smf
2 . . N struct vbe_conn
1 . . N struct bereq
10 . . N worker threads
10 0.00 0.01 N worker threads created
0 0.00 0.00 N worker threads not created
0 0.00 0.00 N worker threads limited
0 0.00 0.00 N queued work requests
0 0.00 0.00 N overflowed work requests
0 0.00 0.00 N dropped work requests
2 . . N backends
0 . . N expired objects
0 . . N LRU nuked objects
0 . . N LRU saved objects
0 . . N LRU moved objects
0 . . N objects on deathrow
0 0.00 0.00 HTTP header overflows
0 0.00 0.00 Objects sent with sendfile
20 0.00 0.02 Objects sent with write
regards,
Michael
0 CLI - Rd ping
0 CLI - Wr 0 200 PONG 1226916062 1.0
9 SessionOpen c 192.168.1.2 4273 192.168.1.53:8080
9 ReqStart c 192.168.1.2 4273 316424748
9 RxRequest c GET
9 RxURL c /
9 RxProtocol c HTTP/1.1
9 RxHeader c Host: theloin:8080
9 RxHeader c User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1;
en-US; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4
9 RxHeader c Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
9 RxHeader c Accept-Language: en-us,en;q=0.5
9 RxHeader c Accept-Encoding: gzip,deflate
9 RxHeader c Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
9 RxHeader c Keep-Alive: 300
9 RxHeader c Connection: keep-alive
9 RxHeader c If-Modified-Since: Mon, 17 Nov 2008 08:47:54 GMT
9 RxHeader c If-None-Match: "7352c-e-a27fe280"
9 RxHeader c Cache-Control: max-age=0
9 VCL_call c recv
9 VCL_return c pass
9 VCL_call c pass
9 VCL_return c pass
12 BackendClose - www1
12 BackendOpen b www1 127.0.0.1 60308 127.0.0.1 81
9 Backend c 12 rrdirector www1
12 TxRequest b GET
12 TxURL b /
12 TxProtocol b HTTP/1.1
12 TxHeader b Host: theloin:8080
12 TxHeader b User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1;
en-US; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4
12 TxHeader b Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
12 TxHeader b Accept-Language: en-us,en;q=0.5
12 TxHeader b Accept-Encoding: gzip,deflate
12 TxHeader b Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
12 TxHeader b If-Modified-Since: Mon, 17 Nov 2008 08:47:54 GMT
12 TxHeader b If-None-Match: "7352c-e-a27fe280"
12 TxHeader b X-Varnish: 316424748
12 TxHeader b X-Forwarded-For: 192.168.1.2
12 RxProtocol b HTTP/1.1
12 RxStatus b 200
12 RxResponse b OK
12 RxHeader b Date: Mon, 17 Nov 2008 10:01:03 GMT
12 RxHeader b Server: Apache/2.2.3 (Ubuntu) mod_perl/2.0.2 Perl/v5.8.8
12 RxHeader b Last-Modified: Mon, 17 Nov 2008 08:47:50 GMT
12 RxHeader b ETag: "7352a-e-a242d980"
12 RxHeader b Accept-Ranges: bytes
12 RxHeader b Content-Length: 14
12 RxHeader b Content-Type: text/html; charset=UTF-8
9 ObjProtocol c HTTP/1.1
9 ObjStatus c 200
9 ObjResponse c OK
9 ObjHeader c Date: Mon, 17 Nov 2008 10:01:03 GMT
9 ObjHeader c Server: Apache/2.2.3 (Ubuntu) mod_perl/2.0.2 Perl/v5.8.8
9 ObjHeader c Last-Modified: Mon, 17 Nov 2008 08:47:50 GMT
9 ObjHeader c ETag: "7352a-e-a242d980"
9 ObjHeader c Content-Type: text/html; charset=UTF-8
12 BackendReuse b www1
9 TTL c 316424748 RFC 120 1226916063 0 0 0 0
9 VCL_call c fetch
9 VCL_return c deliver
9 Length c 0
9 VCL_call c deliver
9 VCL_return c deliver
9 TxProtocol c HTTP/1.1
9 TxStatus c 304
9 TxResponse c Not Modified
9 TxHeader c Date: Mon, 17 Nov 2008 10:01:03 GMT
9 TxHeader c Via: 1.1 varnish
9 TxHeader c X-Varnish: 316424748
9 TxHeader c Last-Modified: Mon, 17 Nov 2008 08:47:50 GMT
9 TxHeader c Connection: keep-alive
9 ReqEnd c 316424748 1226916063.045919657 1226916063.047186613
0.008432627 0.001191616 0.000075340
0 StatAddr - 192.168.1.2 0 736 9 30 0 30 30 7524 313
9 ReqStart c 192.168.1.2 4273 316424749
9 RxRequest c GET
9 RxURL c /
9 RxProtocol c HTTP/1.1
9 RxHeader c Host: theloin:8080
9 RxHeader c User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1;
en-US; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4
9 RxHeader c Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
9 RxHeader c Accept-Language: en-us,en;q=0.5
9 RxHeader c Accept-Encoding: gzip,deflate
9 RxHeader c Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
9 RxHeader c Keep-Alive: 300
9 RxHeader c Connection:_______________________________________________
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