Jayg came across an interesting issue which we talked about on irc
#deltacloud last night... i've spent some more (than I should have for
sure) time on it today and tracked it down to weirdness in net/http. I'm
not convinced its a real problem but thought i'd post it here to see if
anyone else has any thoughts about it.
Problem description/replication:
*start deltacloud when your network is down and try to (e.g.) get a list
of images, obviously you get " (getaddrinfo: Name or service not known)".
*now while deltacloud still running, bring network back up, and try same
request. You get the same result, i.e. " (getaddrinfo: Name or service
not known)", even though the network is now up.
Weirdly, if your network is up when deltacloud starts you don't get
this. In other words:
* start deltacloud as normal with your network up, make a request (which
is successful),
* bring network down, make a request, request fails
* bring network back up, make a request, request successful again.
After much digging around, I've tracked it down to net/http
Net::HTTP.connect (line 560 in /usr/lib/ruby/1.8/net/http.rb) where the
TCPSocket is opened. Simple proof, try this in irb (make sure you use
'irb -rubygems' cos we need to require net etc).
* Bring network down, open a terminal and do 'irb -rubygems', paste the
following:
require "net/http"
require "uri"
uri = URI.parse("http://incubator.apache.org/deltacloud/";)
http = Net::HTTP.new(uri.host, uri.port)
request = Net::HTTP::Get.new(uri.request_uri)
response = http.request(request)
*this will fail since network is down. Without exiting irb session,
bring network up and try the code again, will still fail.
marios
