vCD : Change SSH Session Idle timeout of vCloud Director Appliance.

Its bit annoying that the SSH connection to vCloud DIrector Appliance get cut off for just idling for a short time. So we may want to tweak the ssh configuration of vCD appliance to keep the connection alive for longer period.
The following two properties of SSHD define how long the SSH session should stay though there is no input received from the client.

ClientAliveCountMax
ClientAliveInterval


Please click here fore more details.

ClientAliveCountMax
Sets the number of client alive messages which may be sent without sshd(8) receiving any messages back from the client. If this threshold is reached while client alive messages are being sent, sshd will disconnect the client, terminating the session. It is important to note that the use of client alive messages is very different from TCPKeepAlive. The client alive messages are sent through the encrypted channel and therefore will not be spoofable. The TCP keepalive option enabled by TCPKeepAlive is spoofable. The client alive mechanism is valuable when the client or server depend on knowing when a connection has become inactive.
The default value is
3.

If ClientAliveInterval is set to 15, and ClientAliveCountMax is left at the default, unresponsive SSH clients will be disconnected after approximately 45 seconds.

ClientAliveInterval
Sets a timeout interval in seconds after which if no data has been received from the client, sshd(8) will send a message through the encrypted channel to request a response from the client. The default is 0, indicating that these messages will not be sent to the client.

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Change Hostname of vCloud Director Appliance

Hey All, hope you all doing well.

At the moment when you deploy VCD appliance we dont have the option to provide the hostname for the vCloud Director Cell . When you login to the console or ssh to the appliance, it just shows the default ‘photon-machine’ as the hostname. Its difficult to identify the VCD Cells if you have multiple cells in the environment.

Changing Hostname of the appliance is easy. Here is your warning.  I would not recommend using this workaround in your production environment without being directed to make this change by VMware support or officially documented by VMware.

Please find the steps below.  Continue reading