package node import ( "fmt" "github.com/docker/docker/api/types/swarm" "github.com/docker/docker/cli" "github.com/docker/docker/cli/command" "github.com/spf13/cobra" ) func newDemoteCommand(dockerCli *command.DockerCli) *cobra.Command { return &cobra.Command{ Use: "demote NODE [NODE...]", Short: "Demote one or more nodes from manager in the swarm", Args: cli.RequiresMinArgs(1), RunE: func(cmd *cobra.Command, args []string) error { return runDemote(dockerCli, args) }, } } func runDemote(dockerCli *command.DockerCli, nodes []string) error { demote := func(node *swarm.Node) error { if node.Spec.Role == swarm.NodeRoleWorker { fmt.Fprintf(dockerCli.Out(), "Node %s is already a worker.\n", node.ID) return errNoRoleChange } node.Spec.Role = swarm.NodeRoleWorker return nil } success := func(nodeID string) { fmt.Fprintf(dockerCli.Out(), "Manager %s demoted in the swarm.\n", nodeID) } return updateNodes(dockerCli, nodes, demote, success) }