Hi All,
I think it was due to the nature of the website, (i.e. cookies + json
updates) were playing role not to cache.
I did some changes and it started working (for forced cache rule.)
e.g. sub vcl_recv -> added some lookup for certain conditions.
and sub vcl_fetch -> added set beresp.ttl
But going into another type of trouble: i occasionally get 503 thrown
without any reason.
I have 2 server, i intentionally turned one off, health checkup shows
its sick (great), and sends request to alive one, but 1 out of 20 times
it throws 503.
_[I have added ulimit -n 10000 and restart for 4 times in 503, however
is there any particular reason behind this behaviour?]
_
4 RxURL c /json/showcase/
4 RxProtocol c HTTP/1.1
4 RxHeader c Host: www.example.com
4 RxHeader c X-Real-IP: 188.223.122.81
4 RxHeader c X-Forwarded-For: 188.223.122.81
4 RxHeader c X-Forwarded-Proto: http
4 RxHeader c User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64)
AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
4 RxHeader c Accept: */*
4 RxHeader c Referer: http://www.example.com/
4 RxHeader c Accept-Encoding: gzip,deflate,sdch
4 RxHeader c Accept-Language: en-US,en;q=0.8
4 RxHeader c Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
4 VCL_call c recv
4 VCL_acl c NO_MATCH unwanted
4 VCL_return c pass
4 VCL_call c hash
4 Hash c /json/showcase/
4 Hash c www.example.com
4 VCL_return c hash
4 VCL_call c pass pass
4 FetchError c no backend connection
4 VCL_call c error deliver
4 VCL_call c deliver deliver
4 TxProtocol c HTTP/1.1
4 TxStatus c 503
4 TxResponse c Service Unavailable
4 TxHeader c Server: Varnish
4 TxHeader c Content-Type: text/html; charset=utf-8
4 TxHeader c Content-Length: 715
4 TxHeader c Accept-Ranges: bytes
4 TxHeader c Date: Sat, 27 Apr 2013 15:51:25 GMT
4 TxHeader c X-Varnish: 619632706
4 TxHeader c Age: 0
4 TxHeader c Via: 1.1 varnish
4 TxHeader c Connection: close
4 Length c 715
On 27/04/2013 12:51, Ashish wrote:
Hi , I am quite new on varnish, so far its been really impressive
doing test and quite everything that i wanted to achieve with it,
I did some test with single server, and everything looked good,
interms of cache hit ratio and all. but now i am unable to see
anything as such as cache at all.
Could anyone please show me pointer what in my rule is causing not to
cache?
( Things not working so far)
# Cache as wished: /json/showcase 1s , robot.txt 4 days, CSS/JPG/JS/
3600s
# If everything is busted serve whatever we got for 6 h
=> vcl
################## Define Backend Servers
##########################################
backend box1 { .host = "xx.xx.xx.xx"; .probe = { .url = "/"; .timeout
= 34 ms; .interval = 3s; .window = 5; .threshold = 3; } }
backend box2 { .host = "xx.xx.xx.xx"; .probe = { .url = "/"; .timeout
= 34 ms; .interval = 3s; .window = 5; .threshold = 3; } }
acl unwanted { "188.223.122.81"; }
sub vcl_recv { if (client.ip ~ unwanted) { error 403 "You seem to be
blocked man.";}
if (req.http.user-agent ~
"^someuseragent") {
error 403 "If you think This is Mistake Please use
different User-Agent..";}
}
####################################### Start of Load Balancing
########################
director my_cluster random {
{ .backend = box1; .weight = 2; }
{ .backend = box2; .weight = 2; }
}
###################################### ENd of Load Balancing
############################
###################################### Start of Request Handling
########################
#sub vcl_recv {
if (req.http.host ~ "^(.*\.)?myweb\.com$") {
set req.backend = my_cluster;
}
if (req.request != "GET" &&
req.request != "HEAD" &&
req.request != "PUT" &&
req.request != "POST" &&
req.request != "TRACE" &&
req.request != "OPTIONS" &&
req.request != "DELETE") {
/* Non-RFC2616 or CONNECT which is weird. */
return (pipe);
}
if (req.request != "GET" && req.request != "HEAD") {
/* We only deal with GET and HEAD by default */
return (pass);
}
if (req.http.Authorization || req.http.Cookie) {
/* Not cacheable by default */
return (pass);
}
if (req.request == "GET" || req.request == "HEAD") {
return (lookup);
}
}
####################################### DO not cache anything on
probe ##############
sub vcl_recv {
# This box fqdn is diff then above actual domains
if (req.http.host ~ "^(.*\.)?\.myboxes\.com$") {
return(pass);
}
}
######################################### Start of forced TTL
############################
sub vcl_fetch {
if (req.url ~ "/json/showcase") {
set beresp.ttl = 1s;
}
if (beresp.http.cache-control !~ "s-maxage" &&
req.url ~ "\.(png|gif|jpg)$") {
set beresp.ttl = 120s;
}
if(req.url == "/robots.txt") {
# Robots.txt is updated rarely and should be cached
for 4 days
# Purge manually as required
set beresp.ttl = 96h;
}
# Set TTL for these product
if (req.url ~
"\.(png|gif|jpeg|jpg|ico|swf|css|js|html|htm)$") {
unset beresp.http.set-cookie;
set beresp.ttl = 3600s;
}
# Allow items to be stale if needed (i.e. if we are
down server wise).
set beresp.grace = 6h;
}
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