mirror of https://github.com/docker/docs.git
46 lines
1.0 KiB
Go
46 lines
1.0 KiB
Go
package strategy
|
|
|
|
import (
|
|
"sort"
|
|
|
|
"github.com/docker/swarm/cluster"
|
|
"github.com/docker/swarm/scheduler/node"
|
|
)
|
|
|
|
// SpreadPlacementStrategy places a container on the node with the fewest running containers.
|
|
type SpreadPlacementStrategy struct {
|
|
}
|
|
|
|
// Initialize a SpreadPlacementStrategy.
|
|
func (p *SpreadPlacementStrategy) Initialize() error {
|
|
return nil
|
|
}
|
|
|
|
// Name returns the name of the strategy.
|
|
func (p *SpreadPlacementStrategy) Name() string {
|
|
return "spread"
|
|
}
|
|
|
|
// PlaceContainer places a container on the node with the fewest running containers.
|
|
func (p *SpreadPlacementStrategy) PlaceContainer(config *cluster.ContainerConfig, nodes []*node.Node) (*node.Node, error) {
|
|
weightedNodes, err := weighNodes(config, nodes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// sort by lowest weight
|
|
sort.Sort(weightedNodes)
|
|
|
|
bottomNode := weightedNodes[0]
|
|
for _, node := range weightedNodes {
|
|
if node.Weight != bottomNode.Weight {
|
|
break
|
|
}
|
|
if len(node.Node.Containers) < len(bottomNode.Node.Containers) {
|
|
bottomNode = node
|
|
}
|
|
}
|
|
|
|
return bottomNode.Node, nil
|
|
}
|