I am a newbie to docker world. I have installed docker server and launched containers. This approach is working fine. After this, I created a swarm cluster of 3 servers and tried launching containers of centos and ubuntu. But this launch is failing. I am able to launch nginx, elasticsearch containers in the swarm cluster. I am not able to debug this issue. Can someone help me to figure out the root cause. I am not able to find much documentation on docker swarm.