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https://issues.apache.org/jira/browse/CLOUDSTACK-3652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713224#comment-13713224
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Sheng Yang commented on CLOUDSTACK-3652:
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Seems it's hard to modify the known_hosts file because VR can be migrated
across the host. After talking with Anthony, we decided to increase the
limitation to 1000.
> Increase the concurrent connection number of VR ssh server
> ----------------------------------------------------------
>
> Key: CLOUDSTACK-3652
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-3652
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: Network Controller
> Affects Versions: 4.2.0
> Reporter: Sheng Yang
> Assignee: Sheng Yang
> Priority: Critical
> Fix For: 4.2.0
>
>
> It blocks CLOUDSTACK-3434.
> By default, VR only allow 10 concurrent connections at the same time. But
> since we enable parallel deployment, the number can be ~100.
> We need to increase the MaxSessions and MaxStartups in sshd_config in the VR
> to prevent openssh server from dropping the connections.
> But we need some realistic numbers here. It cannot be infinite big.
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