Port forward fails, if running in a container.

[kmdkuk]

What

Port forward fails, if running in a container.
The following error message is output.

$ sudo pmctl2 forward add 4000 operation:10.72.48.0:4000
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to create bus connection: Host is down
2022-07-04T04:23:02.576480Z kmdkuk-dctest pmctl2 error: "exit status 1"

It is probably due to the use of systemd-run for port forwarding.

placemat/v2/cmd/pmctl2/cmd/forward_add.go

Lines 56 to 63 in 5ade3b5

	c := exec.CommandContext(ctx,
	"systemd-run",
	fmt.Sprintf("--unit=pmctl-forward-%d.service", forward.LocalPort),
	fmt.Sprintf("--description=%s", forwardJSON),
	"socat",
	fmt.Sprintf("tcp-listen:%d,fork,reuseaddr", forward.LocalPort),
	fmt.Sprintf("exec:ip netns exec %s socat STDIO tcp-connect\\:%s\\:%d,nofork",
	forward.PodName, forward.RemoteHost, forward.RemotePort))

How

If you want to use it in container, executesocat using a sidecar.

Checklist

• Finish implentation of the issue
• Test all functions
• Have enough logs to trace activities
• Notify developers of necessary actions