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update.go
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update.go
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package daemon
import (
"fmt"
"github.com/docker/engine-api/types/container"
)
// ContainerUpdate updates resources of the container
func (daemon *Daemon) ContainerUpdate(name string, hostConfig *container.HostConfig) ([]string, error) {
var warnings []string
warnings, err := daemon.verifyContainerSettings(hostConfig, nil)
if err != nil {
return warnings, err
}
if err := daemon.update(name, hostConfig); err != nil {
return warnings, err
}
return warnings, nil
}
func (daemon *Daemon) update(name string, hostConfig *container.HostConfig) error {
if hostConfig == nil {
return nil
}
container, err := daemon.GetContainer(name)
if err != nil {
return err
}
if container.RemovalInProgress || container.Dead {
return fmt.Errorf("Container is marked for removal and cannot be \"update\".")
}
if container.IsRunning() && hostConfig.KernelMemory != 0 {
return fmt.Errorf("Can not update kernel memory to a running container, please stop it first.")
}
if err := container.UpdateContainer(hostConfig); err != nil {
return err
}
// If container is not running, update hostConfig struct is enough,
// resources will be updated when the container is started again.
// If container is running (including paused), we need to update configs
// to the real world.
if container.IsRunning() {
if err := daemon.execDriver.Update(container.Command); err != nil {
return err
}
}
daemon.LogContainerEvent(container, "update")
return nil
}