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COMMANDS.md

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Setup Cluster manually

Register a node manager

suarm create a ssh keys for cluster its are located in keys/ folder. we use them in the next steps. the ips from nodes are described in swarm.jsom after cluster creation.

  • ssh -i keys/<LABEL>_rsa root@<MASTER_NODE_IP> to access to the master node.
  • docker swarm init --advertise-addr <MANAGER-IP> Start docker as swarm mode.
  • Copy suggested result command to the worker nodes, the command look like as
docker swarm join \
  --token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
  192.168.99.100:2377

Join worker nodes

the worker nodes shoud join to master node with ths suggested command from the last step.

  • ssh -i keys/<LABEL>_rsa root@<WORKER_NODE_IP> access to a worker node.
  • Run the last suggested command.
  • Copy suggested result command to the worker nodes, the command look like as
docker swarm join \
  --token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
  192.168.99.100:2377

Tips for nodes

  • Is posible that node are not be in your correct timezone, Fix them with this: sudo timedatectl set-timezone <YOUR_TIME_ZONE> # e.g. America/La_Paz

  • Change release channer in CoreOS vim /etc/coreos/update.conf The content will be GROUP=alpha

Set UI Dashboard for the cluster

One the best dashboards for docker swarm is https://portainer.io/. By default portainer save the data en /data folder and this is cleared when docker is killed/stop or restarted. we need persist the portainer data with these steps.

  • Create folder for volumens in the MASTER NODE with mkdir -p /volumes/portainer/data
  • Create a network for portainer docker network create -d overlay portainer
  • Start portainer with our new volume:
docker service create \
  --name portainer \
  --publish 9000:9000 \
  --constraint 'node.role == manager' \
  --mount type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \
  --mount type=bind,src=/volumes/portainer/data,dst=/data \
  --network portainer \
  portainer/portainer \
  -H unix:///var/run/docker.sock
  • Other alternative to portainer is docker swarm visualizer, for run it try:
docker service create \
--name=viz \
--publish=8000:8080/tcp \
--constraint=node.role==manager \
--mount=type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \
dockersamples/visualizer