Docker1.12 Worker not able to join in cluster(Swarm: Pending)

Question

Manager Version Docker version 1.12.0-rc5, build a3f2063,

Worker version Docker version 1.12.0-rc5, build a3f2063.

Created Swarm m

Answer 1

The thing is, I was trying to join with wrong "port" (As docker swarm init shown in output).

1) Before "docker swarm init", the docker running on port "4243" only. I have checked with netstat -tulp | grep docker. So I advertised with that port!

root@veeru:~# netstat -tulpn | grep docker
tcp6       0      0 :::4243                 :::*                    LISTEN      8750/dockerd 

root@veeru:~# docker swarm init --advertise-addr "172.25.30.2:4243"
Swarm initialized: current node (exvwgj0pu4cd124ljnblt9xff) is now a manager.

To add a worker to this swarm, run the following command:
    docker swarm join \
    --token SWMTKN-1-5j9mpo8hepue6g1sjdas33thr92w1o9hlef5auwqpbxs3glt39-6zomhgu204m9alq51f632nzas \
    172.25.30.2:4243

To add a manager to this swarm, run the following command:
    docker swarm join \
    --token SWMTKN-1-5j9mpo8hepue6g1sjdas33thr92w1o9hlef5auwqpbxs3glt39-axhgqgo4jqw4hv38x578m44wh \
    172.25.30.2:4243

2) After docker swarm init, the docker is running with 4 port including the port 2377(netstat -tupln | grep docker).

root@veeru:~# netstat -tulp | grep docker
tcp6       0      0 [::]:2377               [::]:*                  LISTEN      8750/dockerd    
tcp6       0      0 [::]:7946               [::]:*                  LISTEN      8750/dockerd    
tcp6       0      0 [::]:4243               [::]:*                  LISTEN      8750/dockerd    
udp6       0      0 [::]:7946               [::]:*                              8750/dockerd

In point 1, it is telling to run docker swarm join with port 4243 in worker. Previously I did run like that!.(It wont work!)

Later I did docker swarm leave and joined with port 2377. Now I am able to join!

docker swarm join --token SWMTKN-1-5j9mpo8hepue6g1sjdas33thr92w1o9hlef5auwqpbxs3glt39-6zomhgu204m9alq51f632nzas 172.25.30.2:2377