SSH concurrent session limit in ESXi host?

[sfresher]

I am trying to edit the property file that define the max concurrent ssh session on the ESXi host.  But couldn't find it.  Is it defined in anyway?

[DSTAVERT]

ESXi uses dropbear as the ssh server and client. As far as I know there is no method available for limiting concurrent connections with dropbear other than changing the source code. The abiltiy exists in the source to limit connections but I would not suggest even considering that route.

[AndreTheGiant]

IMHO... consider to disable SSH and use RCLI or PowerCLI instead.

You can simple authorize user with the permission tab.

Andre

[sfresher]

If use PowerCLI, does it has a max concurrent session limit?

[DSTAVERT]

What problem are you needing to address? If you used the vMA for management scripts you can limit access to the vMA using the openssh mechanisms in sshd_config but that doesn't limit access to the ESXi hosts.

[sfresher]

Actually, my intention is not to limit the concurrent session, but to understand the concurrent capacity.  I am working on some automation that dealing with large amount of ESxi activity, both ssh and PowerCLI, so I am just trying to know if there is any capacity cap on the ESXi.

[DSTAVERT]

I should think you could test the ability of ESXi to handle a number of concurrent tasks whether it be vCLI, PowerCLI or SSH. Set up some automated routines to bombard a single unloaded ESXi host. Add some VM loads and test again. The numbere of concurrent vSphere client connections is extremely high if I remember.

[mcowger]

ESXi runs out of PTYs at 8 sessions (over SSH).