Dcos-marathon-sometimes health checks are not green bars

Sometimes, after running a JSON, the status is also blue Running, but the health is not the green bar, this time when the state of UNKONWN, because there is no configuration check caused.

As shown above, as long as we configure the status check, there will be no state of UNKONWN. At the time of configuration, there are HTTP as well as TCP and CMD, this time in TCP, we have two options:
1. Port index, since Docker will randomly assign a port to us when it is started
2. Port number, unless we know the port numbers, that is, the mapping relationship is clear

If the random port, how do we use it.
This is the time to mention MARATHON-LB, also a JSON, after we run, we can go through the DNS resolution provided by master to access the port specified in our Docker.

Say more, an article only solves one problem.