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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-8272) Improve password serving script by making it non-blocking non-locking concurrent server
Date Tue, 10 Mar 2015 10:09:38 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-8272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14354625#comment-14354625
] 

ASF subversion and git services commented on CLOUDSTACK-8272:
-------------------------------------------------------------

Commit 3951ab00e25458c9c804b190ae7c7758f57985a3 in cloudstack's branch refs/heads/concurrent-password-server
from [~rohit.yadav@shapeblue.com]
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=3951ab0 ]

CLOUDSTACK-8272: Python based file-lock free password server implementation

- VRs are single CPU, so Threading based implementation favoured than Forking based
- Implements a Python based password server that does not use file based locks
- Saving password mechanism is provided by using secure token only to VR (localhost)
- Old serve_password implementation is removed
- Runs with Python 2.6+ with no external dependencies
- Locks used within threads for extra safety

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>


> Improve password serving script by making it non-blocking non-locking concurrent server
> ---------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-8272
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8272
>             Project: CloudStack
>          Issue Type: Improvement
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions: 4.5.0, 4.6.0, 4.4.2, 4.3.2
>            Reporter: Rohit Yadav
>            Assignee: Rohit Yadav
>              Labels: virtualrouter
>
> The current reset password server serves one user VM at a time, uses a global lock per
VR and slows up VM starting process for a VM that is created by a template with reset password
scripts. No only reset password option, but when the VM starts for the first time this happens.
The way it serves password uses forking the process/scripts which eats up resources in both
process table and memory. For a concurrent launch of 30+ VM the VR hangs/fails. Possible solution
in the past includes increase the VR memory.
> The solution would be to implement a concurrent single-process multi-threaded password
server that works both in basic/isolated network and in VPCs. It's hard to do this in bash,
so we can either implement a backward compatible python script that replaces the present bash
script, or a compiled program (like a native tool) in C/C++/Go/Rust.



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