[AMBARI-5757] Agent can not download modified stack files if wrong http_proxy is set up

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.6.0
• Fix Version/s: 1.6.1
• Component/s: ambari-agent
• Assignee: Dmitry Lysnichenko
• Reporter: Dmitry Lysnichenko
• Created: 14/May/14 13:00
• Updated: 26/Jun/14 23:45
• Resolved: 14/May/14 15:47

Description

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:

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

I've created a separate jira to be able to provide fix for BUG-17737 as soon as possible

STR:

1. Create 2-node cluster
2. Install server&agent
3. Define wrong proxy on both hosts e.g.

   export http_proxy="http://8.8.8.8:23"
   

4. Restart ambari-agent from the same shell to make use of this proxy
5. Try modifying some service scripts at ambari-server
6. Restart ambari-server
7. 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

Issue Links

• links to: review board