Information System : Linux apprendre2 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64
Disable Function : NONE
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urls: a list of urls to try
max_wait: roughly the maximum time to wait before giving up
The max time is *actually* len(urls)*timeout as each url will
be tried once and given the timeout provided.
a number <= 0 will always result in only one try
timeout: the timeout provided to urlopen
status_cb: call method with string message when a url is not available
headers_cb: call method with single argument of url to get headers
for request.
headers_redact: a list of header names to redact from the log
exception_cb: call method with 2 arguments 'msg' (per status_cb) and
'exception', the exception that occurred.
sleep_time_cb: call method with 2 arguments (response, loop_n) that
generates the next sleep time.
request_method: indicate the type of HTTP request, GET, PUT, or POST
returns: tuple of (url, response contents), on failure, (False, None)
the idea of this routine is to wait for the EC2 metadata service to
come up. On both Eucalyptus and EC2 we have seen the case where
the instance hit the MD before the MD service was up. EC2 seems
to have permanently fixed this, though.
In openstack, the metadata service might be painfully slow, and
unable to avoid hitting a timeout of even up to 10 seconds or more
(LP: #894279) for a simple GET.
Offset those needs with the need to not hang forever (and block boot)
on a system where cloud-init is configured to look for EC2 Metadata
service but is not going to find one. It is possible that the instance
data host (169.254.169.254) may be firewalled off Entirely for a system,
meaning that the connection will block forever unless a timeout is set.
A value of None for max_wait will retry indefinitely.
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