cloud-init fails to fetch metadata with OpenStack
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
cloud-init |
Fix Released
|
High
|
Scott Moser | ||
cloud-init (Ubuntu) |
Fix Released
|
Low
|
Unassigned |
Bug Description
Tested the UEC Lucid, Maverick, Natty and Oneiric images with OpenStack Diablo. When launching multiple (20+) instances at the same time the OpenStack metadata server becomes quite slow and cloud-init fails to fetch the metadata due to its short timeout of 2 (3 for Oneiric) seconds in DataSourceEc2.py. This is an unreasonably small timeout value. I'd suggest a timeout of 60 secs and 5 retries as the default.
init: cloud-init-local main process (217) terminated with status 1
init: cloud-init-nonet main process (290) killed by TERM signal
init: udev-fallback-
init: plymouth main process (59) killed by SEGV signal
init: plymouth-splash main process (345) terminated with status 2
cloud-init start running: Fri, 30 Sep 2011 12:01:48 +0000. up 2.17 seconds
2011-09-30 12:01:50,874 - DataSourceEc2.
2011-09-30 12:01:50,875 - DataSourceEc2.
2011-09-30 12:01:53,879 - DataSourceEc2.
2011-09-30 12:01:54,883 - DataSourceEc2.
2011-09-30 12:01:57,887 - DataSourceEc2.
2011-09-30 12:01:58,893 - DataSourceEc2.
2011-09-30 12:02:01,897 - DataSourceEc2.
2011-09-30 12:02:05,902 - DataSourceEc2.
2011-09-30 12:02:09,907 - DataSourceEc2.
2011-09-30 12:02:13,913 - DataSourceEc2.
2011-09-30 12:02:17,918 - DataSourceEc2.
2011-09-30 12:02:21,923 - DataSourceEc2.
2011-09-30 12:02:26,773 - DataSourceEc2.
2011-09-30 12:02:31,778 - DataSourceEc2.
2011-09-30 12:02:36,785 - DataSourceEc2.
2011-09-30 12:02:41,791 - DataSourceEc2.
2011-09-30 12:02:46,797 - DataSourceEc2.
2011-09-30 12:02:52,013 - DataSourceEc2.
2011-09-30 12:02:58,019 - DataSourceEc2.
2011-09-30 12:03:04,026 - DataSourceEc2.
2011-09-30 12:03:10,033 - DataSourceEc2.
2011-09-30 12:03:16,040 - DataSourceEc2.
2011-09-30 12:03:23,023 - DataSourceEc2.
2011-09-30 12:03:30,030 - DataSourceEc2.
2011-09-30 12:03:37,038 - DataSourceEc2.
2011-09-30 12:03:44,046 - DataSourceEc2.
2011-09-30 12:03:51,054 - DataSourceEc2.
2011-09-30 12:03:59,063 - DataSourceEc2.
2011-09-30 12:04:07,071 - DataSourceEc2.
2011-09-30 12:04:15,082 - DataSourceEc2.
2011-09-30 12:04:23,091 - DataSourceEc2.
2011-09-30 12:04:29,097 - DataSourceEc2.
no instance data found in start
Related branches
- Chad Smith (community): Needs Fixing
- Hannes: Pending requested
-
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- JJ Asghar: Pending requested
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- Scott Moser: Pending requested
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affects: | cloud-utils (Ubuntu) → cloud-init (Ubuntu) |
Changed in cloud-init: | |
status: | Fix Committed → Fix Released |
2 seconds might have been low, I agree, however the following works fine: Request( sys.argv[ 1]); \ urllib2. urlopen( req, timeout= float(sys. argv[2] )); resp.read()' $s" .1
$ for s in cnn.com brickies.net slashdot.org espn.com; do
python -c 'import urllib2, sys; req=urllib2.
resp=
"http://
done
That does the same urllib2.urlopen with a timeout that cloud-init does.
Note the '.1' second timeout for all of those sites that are doing loads
more than serving a 10s of bytes of text (ok, brickies.net is not, but it
is also on shared hosting). I had to set that to .08 to get failures on
any of the listed sites. 3 seconds (the default in the code) should be
plenty.
But... we can up it,and it probably was arbitrarily low.
we had to set a timeout otherwise there is none, and due to the fact
that cloud-init retries the MD again and again (giving it time to come
up due to bugs/bad-design in EC2 and Eucalyptus). If the address
169.254.169.254 has been firewalled off, you potentially hang indefinitely
trying to connect (in the case where you're not running in a cloud).
I urge anyone interested in this to help to fix this bug in openstack. pad.lv/ 851159 although I have not
There is a proposed solution at http://
tested. Additionally, it is suggested (by vish and others) that you can
reduce this slowness by running an API server on each of the nodes. I
don't know how feasible that is. It is simply absurd to not be able to
respond to requests to the metadata service in less than 3 seconds (or 5
or 10).
The issue we were trying to protect against really was "non-cloud"
installation of cloud-init. Ie, in 10.04 or maybe maverick, install of
cloud-init on your laptop, and reboot would be blocked boot by cloud-init
for something like 1500 seconds. No fun.
Regarding your suggestion of 60 second timeout, and 5 retries, that
would also be insufficient. There is a case where the metadata service
isn't ready yet (this occurred on Eucalyptus and we've also seen it on
EC2, although not recently on either). In that case, the connections
would immeditely get "connection refused", so the 5 retries would occur
within 5 seconds, and never find the Metadata service.