Objective: To be able to run more than 10 browsers and using multiple machines(Server 1,2).

Pre Req. -

Docker Swarm requires few ports to be open for it to work. These are
-TCP port 2377. This port is used for communication between the nodes of a Docker Swarm or cluster. It only needs to be opened on manager nodes.
-TCP and UDP port 7946 for communication among nodes (container network discovery).
-UDP port 4789 for overlay network traffic (container ingress networking).

Install Docker on Server
First install docker on all 2 machines.eg Server 1,2
- curl -SsL https://get.docker.com | sh

Then add the ubuntu user to the docker group, so we don’t need to use sudo everytime we use the docker command
- sudo usermod -aG docker ubuntu

On Server 1
- docker swarm init — advertise-addr=82.66.x.x — Here 82.66.x.x is the public IP of the machine.

Now docker swarm is ready and nodes can connect to it, ssh into the Server 2 grid machine and run the following command
On Server 2
- docker swarm join — token SWMTKN-1-……….
- docker info

Run the following command to deploy docker swarm https://goo.gl/Fsq6fu
- docker stack deploy — compose-file grid.yaml foobar

To view status of the docker swarm
- docker stack ps foobar

To shut down docker swarm
- docker stack rm foobar

To debug a specific container
- docker logs -f <container-id>

To leave docker swarm, type the following command both on manager node and worker node
- docker swarm leave — force

Slides https://goo.gl/qjifHq
Instructions https://goo.gl/gzhg1m
Grid Yaml — https://goo.gl/Fsq6fu
http://play-with-docker.com

Pramod Dutta(Scrolltest)

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