My varnish version is 3.0
.
My server works well while I curl the URLs, but when use varnish cache it return 503 service unavailable
occasionally.
The log info likes is:
0 Debug - "VCL_error(200, OK)"
24 VCL_call c recv error
24 VCL_call c error deliver
24 SessionClose c error
0 Debug - "VCL_error(200, OK)"
27 VCL_call c recv error
27 VCL_call c error deliver
27 SessionClose c error
0 Debug - "VCL_error(200, OK)"
16 VCL_call c recv error
16 VCL_call c error deliver
16 SessionClose c error
14 Debug - "Write error, retval = 2998272, len = 8465870, errno = Success"
0 Debug - "VCL_error(200, OK)"
14 VCL_call c recv error
14 VCL_call c error deliver
14 SessionClose c error
0 Debug - "VCL_error(200, OK)"
21 VCL_call c recv error
21 VCL_call c error deliver
21 SessionClose c error
PS:The server response 200 when I curl or type the urls on browsers.
varnish 503 can be fixed by steps below:
Increase the connect_timeout
,.first_byte_timeout
and .between_bytes_timeout
in you backend setting:
backend default {
.host = "www.example.com";
.connect_timeout = 5s;
.first_byte_timeout = 10s;
.between_bytes_timeout = 10s;
}
Increase the parameter to 8192 when start varnish.
varnishd [options] http_resp_hdr_len=8192
Checkout you network
or backend server
.
If Step 1 and Step 2 can not help you, please check you network connection
and banckend server's availability
.