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946b4ced54
Set up nbetworking ports for the following use cases: * bind the same port between host and container * bind a specific host port to a different container port * bind a random host port to a specific container port Signed-off-by: baude <bbaude@redhat.com> Closes: #214 Approved by: baude
105 lines
3.0 KiB
Go
105 lines
3.0 KiB
Go
package libpod
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import (
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"net"
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"github.com/containernetworking/plugins/pkg/ns"
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"github.com/cri-o/ocicni/pkg/ocicni"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// Get an OCICNI network config
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func getPodNetwork(id, name, nsPath string, ports []ocicni.PortMapping) ocicni.PodNetwork {
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return ocicni.PodNetwork{
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Name: name,
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Namespace: name, // TODO is there something else we should put here? We don't know about Kube namespaces
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ID: id,
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NetNS: nsPath,
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PortMappings: ports,
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}
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}
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// Create and configure a new network namespace for a container
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func (r *Runtime) createNetNS(ctr *Container) (err error) {
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ctrNS, err := ns.NewNS()
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if err != nil {
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return errors.Wrapf(err, "error creating network namespace for container %s", ctr.ID())
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}
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defer func() {
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if err != nil {
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if err2 := ctrNS.Close(); err2 != nil {
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logrus.Errorf("Error closing partially created network namespace for container %s: %v", ctr.ID(), err2)
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}
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}
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}()
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logrus.Debugf("Made network namespace at %s for container %s", ctrNS.Path(), ctr.ID())
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podNetwork := getPodNetwork(ctr.ID(), ctr.Name(), ctrNS.Path(), ctr.config.PortMappings)
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_, err = r.netPlugin.SetUpPod(podNetwork)
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if err != nil {
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return errors.Wrapf(err, "error configuring network namespace for container %s", ctr.ID())
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}
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ctr.state.NetNS = ctrNS
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return nil
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}
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// Join an existing network namespace
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func joinNetNS(path string) (ns.NetNS, error) {
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ns, err := ns.GetNS(path)
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if err != nil {
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return nil, errors.Wrapf(err, "error retrieving network namespace at %s", path)
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}
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return ns, nil
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}
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// Get a container's IP address
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func (r *Runtime) getContainerIP(ctr *Container) (net.IP, error) {
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if ctr.state.NetNS == nil {
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return nil, errors.Wrapf(ErrInvalidArg, "container %s has no network namespace, cannot get IP", ctr.ID())
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}
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podNetwork := getPodNetwork(ctr.ID(), ctr.Name(), ctr.state.NetNS.Path(), ctr.config.PortMappings)
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ipStr, err := r.netPlugin.GetPodNetworkStatus(podNetwork)
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if err != nil {
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return nil, errors.Wrapf(err, "error retrieving network status of container %s", ctr.ID())
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}
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ip := net.ParseIP(ipStr)
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if ip == nil {
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return nil, errors.Wrapf(ErrInternal, "error parsing IP address %s for container %s", ipStr, ctr.ID())
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}
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return ip, nil
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}
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// Tear down a network namespace
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func (r *Runtime) teardownNetNS(ctr *Container) error {
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if ctr.state.NetNS == nil {
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// The container has no network namespace, we're set
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return nil
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}
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logrus.Debugf("Tearing down network namespace at %s for container %s", ctr.state.NetNS.Path(), ctr.ID())
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podNetwork := getPodNetwork(ctr.ID(), ctr.Name(), ctr.state.NetNS.Path(), ctr.config.PortMappings)
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// The network may have already been torn down, so don't fail here, just log
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if err := r.netPlugin.TearDownPod(podNetwork); err != nil {
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logrus.Errorf("Failed to tear down network namespace for container %s: %v", ctr.ID(), err)
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}
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if err := ctr.state.NetNS.Close(); err != nil {
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return errors.Wrapf(err, "error closing network namespace for container %s", ctr.ID())
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}
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ctr.state.NetNS = nil
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return nil
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}
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