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There can be only one administration service in a node network. Nodes running other services should be connected to the administration service node. Once a service has successfully connected to an administration service, then that service cannot easily be switched to work with another appliance's administration service. ­­

Prerequisites

• Two Digital Access components with services and docker swarm available 

• The following ports shall be open to traffic to and from each Docker host participating on an overlay network:

  • TCP port 2377 for cluster management communications

  • TCP and UDP port 7946 for communication among nodes

  • UDP port 4789 for overlay network traffic

• For more details refer to: https://docs.docker.com/network/overlay/

• Keep a note of IP addresses of nodes where access point is running.

Step-by-step instruction

Get token and stop services - manager node

Get cluster join token

1. SSH to the node running the administration service, that is, the manager node.

2. Get the cluster join token by running this command. This token will be used for joining worker nodes to the manager node.

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Get token

sudo docker swarm join-token worker

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The output of the command will be like:

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docker swarm join --token SWMTKN-1-5dxny21y4oslz87lqjzz4wj2wejy6vicjtqwq33mvqqni42ki2-1gvl9xiqcrlxuxoafesxampwq 192.168.253.139:2377

Stop services

Stop the running services.

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Stop services

sudo docker stack rm <your da stack name>

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See Join as worker nodes in Set up high availability for Digital Access component.

At manager node

Remove labels, verify and identify nodes

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1. SSH to manager node.

2. Remove label for all services which are not required on this node.

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1. Remove label

   Code Block
   sudo docker node update --label-rm da-access-point <nodeid>

2. Verify if all nodes are part of cluster by running this command.

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1. Verify if all nodes are part of cluster

   Code Block
   sudo docker node ls

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1. Image Added

2. Identify nodes ID, master and worker where the service will be distributed.

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1. Identify nodes

   Code Block
   sudo docker node inspect --format '{{ .Status }}' h9u7iiifi6sr85zyszu8xo54l

   Output: {ready  192.168.86.129} - IP address will help to identify the DA node  

Update labels for each service

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1.  Update labels for each service which you want to run on worker nodes.

2.  <node ID> is the id of the node on which the service will be running.

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1. Commands to update labels

   Code Block
   sudo docker node update --label-add da-policy-service=true <worker node ID> sudo docker node update --label-add da-access-point=true <worker node ID>

2. Deploy your stack using this command. To run the command your working directory should be docker-compose.

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1. Deploy DA stack

   Code Block
   sudo docker stack deploy --compose-file docker-compose.yml -c network.yml -c versiontag.yml <your da stack name>

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Here: 

• docker stack deploy is the command to deploy services as stack. 

• compose file flag is used to provide the file name of base docker-compose file. 

• -c is short for –compose-file flag. It is used to provide override files for docker -compose. 

• <your da stack name> is the name of the stack. You can change it based on requirements.

Additional information