Dockercon Swarm Updated
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This document discusses Docker Swarm, a clustering and orchestration tool for Docker. It provides instructions for setting up a Swarm cluster using either a hosted discovery service or your own discovery service like Etcd. It also covers resource management using memory and CPU limits, port mapping, constraints to control where containers run, rescheduling policies, and the two step Swarm scheduler process of filtering nodes and selecting the best placement.
Dockercon Swarm Updated
- 1. Docker Swarm! @aluzzardi - @vieux!
- 2. Demo! us-west! us-east! Docker! CLI! Docker! CLI! Docker! CLI! =! RAM: 2GB! CPU: 1core!
- 3. Demo! us-west! us-east! =! RAM: 2GB! CPU: 1core! Docker! CLI! Docker! CLI!
- 4. Setup using the hosted discovery service! • Create a cluster:! $ swarm create • Add nodes to a cluster:! $ swarm join --discovery=token://<token> --addr=<node_ip> • List nodes in a cluster! $ swarm list --discovery=token://<token> • Start Swarm! $ swarm manage --discovery=token://<token> --addr=<swarm_ip> ! !
- 5. Setup using your own discovery service! • Add nodes to a cluster:! $ swarm join --discovery=etcd://<etcd_ip>/foobar --addr=<node_ip> • List nodes in a cluster! $ swarm list --discovery=etcd://<etcd_ip>/foobar • Start Swarm! $ swarm manage –discovery=etcd://<etcd_ip>/foobar --addr=<swarm_ip> ! Note: consul and etcd can be used, zookeeper support on it’s way.! ! !
- 6. Resource Management! • Memory! " "$ docker run -m 1g … • CPU! " "$ docker run -c 1 … • Ports! " "$ docker run -p 80:80 … • More to come, ex: network interfaces! ! ! !
- 7. Constraints! • Standard constraints induced from docker info! docker run -e “constraint:operatingsystem=fedora” … " "docker run -e “constraint:storagedriver=aufs” … • Custom constraints with host labels! " "docker -d --label “region=us-east” " "docker run -e “constraint:region=us-east” … • Pin a container to a specific host! " "docker run –e “constraint:node=ubuntu-2” … • More to come, ex: affinity! !
- 8. Rescheduling! • Rescheduling policies; similar to `--restart`! • Pending status! ! ! !
- 9. Swarm scheduler! 2 steps:! ! • 1- Apply filters to exclude nodes! " "- ports! " "- labels! " "- health! • 2- Use a strategy to pick the best node! " "- bin packing! " "- random! ! ! ! ! Contributions are welcome ☺ :!