// getContainerArtifacts returns type-specific interfaces for
// managing containers.
//
// The ToolsFinder passed in may be replaced or wrapped to
// enforce container-specific constraints.
func (cs *ContainerSetup) getContainerArtifacts(
containerType instance.ContainerType, toolsFinder ToolsFinder,
) (
container.Initialiser,
environs.InstanceBroker,
ToolsFinder,
error,
) {
var initialiser container.Initialiser
var broker environs.InstanceBroker
managerConfig, err := containerManagerConfig(containerType, cs.provisioner, cs.config)
if err != nil {
return nil, nil, nil, err
}
switch containerType {
case instance.KVM:
initialiser = kvm.NewContainerInitialiser()
broker, err = NewKvmBroker(
cs.provisioner,
cs.config,
managerConfig,
)
if err != nil {
logger.Errorf("failed to create new kvm broker")
return nil, nil, nil, err
}
case instance.LXD:
series, err := cs.machine.Series()
if err != nil {
return nil, nil, nil, err
}
initialiser = lxd.NewContainerInitialiser(series)
manager, err := lxd.NewContainerManager(managerConfig)
if err != nil {
return nil, nil, nil, err
}
broker, err = NewLxdBroker(
cs.provisioner,
manager,
cs.config,
)
if err != nil {
logger.Errorf("failed to create new lxd broker")
return nil, nil, nil, err
}
default:
return nil, nil, nil, fmt.Errorf("unknown container type: %v", containerType)
}
return initialiser, broker, toolsFinder, nil
}
// getContainerArtifacts returns type-specific interfaces for
// managing containers.
//
// The ToolsFinder passed in may be replaced or wrapped to
// enforce container-specific constraints.
func (cs *ContainerSetup) getContainerArtifacts(
containerType instance.ContainerType, toolsFinder ToolsFinder,
) (
container.Initialiser,
environs.InstanceBroker,
ToolsFinder,
error,
) {
var initialiser container.Initialiser
var broker environs.InstanceBroker
managerConfig, err := containerManagerConfig(containerType, cs.provisioner, cs.config)
if err != nil {
return nil, nil, nil, err
}
// Override default MTU for LXC NICs, if needed.
if mtu := managerConfig.PopValue(container.ConfigLXCDefaultMTU); mtu != "" {
value, err := strconv.Atoi(mtu)
if err != nil {
return nil, nil, nil, errors.Trace(err)
}
logger.Infof("setting MTU to %v for all LXC containers' interfaces", value)
cs.lxcDefaultMTU = value
}
// Enable IP forwarding and ARP proxying if needed.
if ipfwd := managerConfig.PopValue(container.ConfigIPForwarding); ipfwd != "" {
if err := setIPAndARPForwarding(true); err != nil {
return nil, nil, nil, errors.Trace(err)
}
cs.addressableContainers = true
logger.Infof("enabled IP forwarding and ARP proxying for containers")
}
// Enable NAT if needed.
if nat := managerConfig.PopValue(container.ConfigEnableNAT); nat != "" {
cs.enableNAT = true
logger.Infof("enabling NAT for containers")
}
switch containerType {
case instance.LXC:
series, err := cs.machine.Series()
if err != nil {
return nil, nil, nil, err
}
initialiser = lxc.NewContainerInitialiser(series)
broker, err = NewLxcBroker(
cs.provisioner,
cs.config,
managerConfig,
cs.imageURLGetter,
cs.enableNAT,
cs.lxcDefaultMTU,
)
if err != nil {
return nil, nil, nil, err
}
// LXC containers must have the same architecture as the host.
// We should call through to the finder since the version of
// tools running on the host may not match, but we want to
// override the arch constraint with the arch of the host.
toolsFinder = hostArchToolsFinder{toolsFinder}
case instance.KVM:
initialiser = kvm.NewContainerInitialiser()
broker, err = NewKvmBroker(
cs.provisioner,
cs.config,
managerConfig,
cs.enableNAT,
)
if err != nil {
logger.Errorf("failed to create new kvm broker")
return nil, nil, nil, err
}
case instance.LXD:
series, err := cs.machine.Series()
if err != nil {
return nil, nil, nil, err
}
initialiser = lxd.NewContainerInitialiser(series)
broker, err = NewLxdBroker(
cs.provisioner,
cs.config,
managerConfig,
cs.enableNAT,
)
if err != nil {
logger.Errorf("failed to create new lxd broker")
return nil, nil, nil, err
}
default:
return nil, nil, nil, fmt.Errorf("unknown container type: %v", containerType)
}
return initialiser, broker, toolsFinder, nil
}