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

For me it was a firewall issue too.

1. I tried to ping to the manager node and was pinging back

2. Checked if the ports are opening using telnet and was not able to connect and figured out it was the port issue.

If you are running Centos than the port can be easily opened using the firewalld

Check if the firewalld is running

sudo firewall-cmd --state

Opening the port you want

sudo firewall-cmd --zone=public --add-port=2377/tcp

Change the port as per your node ports it is trying to connect to.