Configuring Swarm Workers
Shippable uses Docker Swarm to manage all microservices, which are Docker containers. While the default setting installs Swarm on the same node as Admiral, you can choose to add Swarm workers in order to configure your installation for high availability in case a Server node goes down. The more Swarm workers you have and the more capacity each worker has, the easier your microservices will recover if any node(s) go down.
Adding Swarm Workers
Swarm workers are added in the UI interface of the Admiral installer. Workers should be Ubuntu 14.04 nodes and Docker 1.13 will be installed during initialization.
To add another machine as a worker, do the following before clicking Initialize:
- Select New Node(s) on the Swarm line in the Initialize infrastructure panel.
- Enter a name for the worker and the IP address and click Add If you would like to add more than one worker, repeat this step to add the other workers. Each machine added must be running Ubuntu 14.04.
- Run the command displayed on each new worker to allow Admiral SSH access to the machines and check the box to confirm that this step was completed. SSH access is required to run the setup scripts.
Configure all of the other infrastructure components how you would like them installed and click Initialize. Progress installing and initializing components will be shown on the right side of the initialize panel.
Once workers start initializing, you'll be able view the initialization logs by clicking the Worker init logs button.