问题
How to test a remote port is reachable with socat?
with netcat we can
nc -zv 192.168.1.15 22
How to do that with socat?
回答1:
I would imagine that the first example in the man page would work
socat - TCP4:www.domain.org:80
For your example, this would be (and adding 2 second connect timeout):
socat - TCP4:192.168.1.15:22,connect-timeout=2
and the response would be the sshd connect banner (if that is what is listening)
SSH-2.0-OpenSSH_5.3
or
socat[12650] E connecting to AF=2 192.168.189.6:23: Connection timed out
回答2:
As the OP requested the equivalent of -z
the following socat
command will ensure that it does not wait for input and just checks if the port is listening or not.
socat /dev/null TCP:remote:port
This can be used in a Docker context especially on health checks for the alpine/socat
image. Here is an example that sets up a forwarder for the smtp
service to a mailhog
service and checks if the connection is up
services:
smtp:
image: alpine/socat
command: tcp-listen:25,fork TCP:mailhog:1025
healthcheck: socat /dev/null TCP:mailhog:1025
来源:https://stackoverflow.com/questions/47844060/how-to-test-a-remote-port-is-reachable-with-socat