Dmitry Lysnichenko created AMBARI-5757:
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Summary: Agent can not download modified stack files if wrong
http_proxy is set up
Key: AMBARI-5757
URL: https://issues.apache.org/jira/browse/AMBARI-5757
Project: Ambari
Issue Type: Task
Components: agent
Affects Versions: 1.6.0
Reporter: Dmitry Lysnichenko
Assignee: Dmitry Lysnichenko
Fix For: 1.7.0
Agent can not download (update) modified stack scripts/templates from the
server if there is a problem with proxy configuration. That is because python's
urllib2.urlopen() function also tries to make use of proxies.
>From the docs:
{code}
The urlopen() function works transparently with proxies which do not require
authentication. In a Unix or Windows environment, set the http_proxy, or
ftp_proxy environment variables to a URL that identifies the proxy server
before starting the Python interpreter
{code}
I've created a separate jira to be able to provide fix for BUG-17737 as soon as
possible
STR:
# Create 2-node cluster
# Install server&agent
# Define wrong proxy on both hosts e.g.
{code}
export http_proxy="http://8.8.8.8:23";
{code}
# Restart ambari-agent from the same shell to make use of this proxy
# Try modifying some service scripts at ambari-server
# Restart ambari-server
# Ambari-agent should download updated scripts to a local cache (during
installation of the relevant stack), but he can not do that due to proxy
settings. There are error messages at log about that.
Possible solution: Disable proxy settings when creating urllib2 opener (at
FileCache)
The same urllib2 is used at Controller, so agent might not be able to connect
to ambari-server at all with wrong proxy settings. But I did not notice such
behaviour for some reason
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