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https://issues.apache.org/jira/browse/CLOUDSTACK-9348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295966#comment-15295966
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ASF subversion and git services commented on CLOUDSTACK-9348:
-------------------------------------------------------------
Commit d5b61312bfb1c09d0635149810904634c9904ddb in cloudstack's branch
refs/heads/4.5 from [~rohit.ya...@shapeblue.com]
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=d5b6131 ]
CLOUDSTACK-9348: NioConnection improvements
- Unit test to demonstrate denial of service attack
The NioConnection uses blocking handlers for various events such as connect,
accept, read, write. In case a client connects NioServer (used by
agent mgr to service agents on port 8250) but fails to participate in SSL
handshake or just sits idle, this would block the main IO/selector loop in
NioConnection. Such a client could be either malicious or aggresive.
This unit test demonstrates such a malicious client that can perform a
denial-of-service attack on NioServer that blocks it to serve any other
client.
- Use non-blocking SSL handshake
- Uses non-blocking socket config in NioClient and NioServer/NioConnection
- Scalable connectivity from agents and peer clustered-management server
- Removes blocking ssl handshake code with a non-blocking code
- Protects from denial-of-service issues that can degrade mgmt server
responsiveness
due to an aggressive/malicious client
- Uses separate executor services for handling ssl handshakes
Cherry-picked and backported from 9c7518698d2f4a9fcc6a83fd22dd5b2fc4260232
Signed-off-by: Rohit Yadav <rohit.ya...@shapeblue.com>
> CloudStack Server degrades when a lot of connections on port 8250
> -----------------------------------------------------------------
>
> Key: CLOUDSTACK-9348
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9348
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Reporter: Rohit Yadav
> Assignee: Rohit Yadav
> Fix For: 4.9.0
>
>
> An intermittent issue was found with a large CloudStack deployment, where
> servers could not keep agents connected on port 8250.
> All connections are handled by accept() in NioConnection:
> https://github.com/apache/cloudstack/blob/master/utils/src/main/java/com/cloud/utils/nio/NioConnection.java#L125
> A new connection is handled by accept() which does blocking SSL handshake. A
> good fix would be to make this non-blocking and handle expensive tasks in
> separate threads/pool. This way the main IO loop won't be blocked and can
> continue to serve other agents/clients.
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