Schedulers

Tsuru uses schedulers to chooses which node an unit should be deployed. There are two schedulers: round robin and segregate scheduler.

Segregate scheduler

Segregate scheduler is a scheduler that segregates the units between nodes by team.

irst, what you need to do is to define a relation between nodes and teams. And then, the scheduler deploys the app unit on the node related to its team.

team1 -> node1

team2 -> node3

others -> fallback (node4)

Configuration and setup

To use the segregate scheduler you shoud enable the segregate mode in tsuru.conf and make sure that the details about the scheduler storage (redis) is also configured:

docker:
  segregate: true
  scheduler:
    redis-server: 127.0.0.1:6379
    redis-prefix: docker-cluster

Adding a node

You can use the tsr to add nodes:

$ tsr docker-add-node someid http://localhost:4243 myteam

Adding a fallback node

To add a fallback, you just need to add a node without team:

$ tsr docker-add-node someid http://localhost:4243

Removing a node

You can use the tsr to remove nodes:

$ tsr docker-rm-node xxx
Node successfully removed.

List nodes

Just use docker-list-nodes to list nodes:

$ tsr docker-list-nodes
+------+-----------------------+------------------+
| ID   | Address               | Team             |
+------+-----------------------+------------------+
| fall | http://localhost:4243 |                  |
| xpto | http://localhost:4243 | xpto             |
+------+-----------------------+------------------+