an error occurred forwarding 2222

[FoghostCn]

Describe the bug
A clear and concise description of what the bug is.

an error occurred forwarding 2222
Log
please add -d to debug log

6:29PM INF Client address 10.252.154.90
6:29PM INF Shadow is ready.
Forwarding from 127.0.0.1:2222 -> 22
Forwarding from [::1]:2222 -> 22
Handling connection for 2222
E0814 18:29:15.441716   22741 portforward.go:400] an error occurred forwarding 2222 -> 22: error forwarding port 22 to pod d36cd49708faf80b96ef3ff70e844d0fc439293276dc367927973711bc31aa2b, uid : unable to do port forwarding: socat not found.
ssh_exchange_identification: Connection closed by remote host
client: fatal: failed to establish ssh session (1)
E0814 18:30:05.450612   22741 portforward.go:233] lost connection to pod

Environment (please complete the following information):

• OS: MacOS
• Kubernetes: v1.12.4
• KT Version: 0.0.5

Additional context
Add any other context about the problem here.

[FoghostCn]

I'v installed socat, not work

[yunlzheng]

unable to do port forwarding: socat not found.
ssh_exchange_identification: Connection closed by remote host

manually install socat on each node