nodeagent

package
v0.0.0-...-bff6dc3 Latest Latest
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 Go to latest Published: May 16, 2024 License: Apache-2.0 Imports: 49 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// to reliably identify kubelet healthprobes from inside the pod (versus standard kube-proxy traffic,
	// since the IP is normally the same), we SNAT identified host probes in the host netns to a fixed
	// APIPA/"link-local" IP.
	//
	// It doesn't matter what this IP is, so long as it's not routable and doesn't collide with anything else.
	//
	// IPv6 link local ranges are designed to be collision-resistant by default, and so probably never need to be overridden
	DefaultHostProbeSNATIP   = "169.254.7.127"
	DefaultHostProbeSNATIPV6 = "fd16:9254:7127:1337:ffff:ffff:ffff:ffff"
)

Variables

View Source 
var (
	PodNamespace      = env.RegisterStringVar("SYSTEM_NAMESPACE", constants.IstioSystemNamespace, "pod's namespace").Get()
	PodName           = env.RegisterStringVar("POD_NAME", "", "").Get()
	NodeName          = env.RegisterStringVar("NODE_NAME", "", "").Get()
	Revision          = env.RegisterStringVar("REVISION", "", "").Get()
	HostProbeSNATIP   = netip.MustParseAddr(env.RegisterStringVar("HOST_PROBE_SNAT_IP", DefaultHostProbeSNATIP, "").Get())
	HostProbeSNATIPV6 = netip.MustParseAddr(env.RegisterStringVar("HOST_PROBE_SNAT_IPV6", DefaultHostProbeSNATIPV6, "").Get())
)
View Source 
var ErrPartialAdd = errors.New("partial add error")
View Source 
var ErrPodNotFound = errors.New("netns not provided, but is needed as pod is not in cache")
View Source 
var (
	EventTotals = monitoring.NewSum(
		"nodeagent_reconcile_events_total",
		"The total number of node agent reconcile events.",
	)
)

Functions

func GetFd 

func GetFd(f fs.File) (uintptr, error)

func GetInode 

func GetInode(fi fs.FileInfo) (uint64, error)

func GetPodUIDAndContainerID 

func GetPodUIDAndContainerID(procCgroupData bytes.Buffer) (types.UID, string, error)

func NetnsDo 

func NetnsDo(fdable NetnsFd, toRun func() error) error

inspired by netns.Do() but with an existing fd.

func NetnsSet 

func NetnsSet(n NetnsFd) error

func StartHealthServer 

func StartHealthServer() (installReady *atomic.Value, watchReady *atomic.Value)

StartHealthServer initializes and starts a web server that exposes liveness and readiness endpoints at port 8000.

Types

type AmbientArgs 

type AmbientArgs struct {
	SystemNamespace string
	Revision        string
	KubeConfig      string
	ServerSocket    string
	DNSCapture      bool
	EnableIPv6      bool
}

type CNIPluginAddEvent 

type CNIPluginAddEvent struct {
	Netns        string
	PodName      string
	PodNamespace string
	IPs          []IPConfig
}

Just a composite of the CNI plugin add event struct + some extracted "args"

type Cgroup 

type Cgroup struct {
	HierarchyID    string
	ControllerList string
	GroupPath      string
}

Cgroup represents a linux cgroup.

func GetCgroups 

func GetCgroups(procCgroupData bytes.Buffer) ([]Cgroup, error)

GetCGroups returns a slice of cgroups for pid using fs for filesystem calls.

The expected cgroup format is "hierarchy-ID:controller-list:cgroup-path", and this function will return an error if every cgroup does not meet that format.

For more information, see:

type CniPluginServer 

type CniPluginServer struct {
	// contains filtered or unexported fields
}

func (*CniPluginServer) ReconcileCNIAddEvent 

func (s *CniPluginServer) ReconcileCNIAddEvent(ctx context.Context, addCmd CNIPluginAddEvent) error

func (*CniPluginServer) Start 

func (s *CniPluginServer) Start() error

Start starts up a UDS server which receives events from the CNI chain plugin.

func (*CniPluginServer) Stop 

func (s *CniPluginServer) Stop()

type IPConfig 

type IPConfig struct {
	Interface *int
	Address   net.IPNet
	Gateway   net.IP
}

IPConfig contains an interface/gateway/address combo defined for a newly-started pod by CNI. This is "from the horse's mouth" so to speak and will be populated before Kube is informed of the pod IP.

type InformerHandlers 

type InformerHandlers struct {
	// contains filtered or unexported fields
}

func (*InformerHandlers) GetAmbientPods 

func (s *InformerHandlers) GetAmbientPods() []*corev1.Pod

func (*InformerHandlers) GetPodIfAmbient 

func (s *InformerHandlers) GetPodIfAmbient(podName, podNamespace string) (*corev1.Pod, error)

func (*InformerHandlers) Start 

func (s *InformerHandlers) Start()

type K8sHandlers 

type K8sHandlers interface {
	GetPodIfAmbient(podName, podNamespace string) (*corev1.Pod, error)
	GetAmbientPods() []*corev1.Pod
	Start()
}

type MeshDataplane 

type MeshDataplane interface {
	// called first, (even before Start()).
	ConstructInitialSnapshot(ambientPods []*corev1.Pod) error
	Start(ctx context.Context)

	//	IsPodInMesh(ctx context.Context, pod *metav1.ObjectMeta, netNs string) (bool, error)
	AddPodToMesh(ctx context.Context, pod *corev1.Pod, podIPs []netip.Addr, netNs string) error
	RemovePodFromMesh(ctx context.Context, pod *corev1.Pod) error
	DelPodFromMesh(ctx context.Context, pod *corev1.Pod) error

	Stop()
}

type NetServer 

type NetServer struct {
	// contains filtered or unexported fields
}

Adapts CNI to ztunnel server. decoupled from k8s for easier integration testing.

func (*NetServer) AddPodToMesh 

func (s *NetServer) AddPodToMesh(ctx context.Context, pod *corev1.Pod, podIPs []netip.Addr, netNs string) error

AddPodToMesh adds a pod to mesh by 1. Getting the netns 2. Adding the pod's IPs to the hostnetns ipsets for node probe checks 3. Creating iptables rules inside the pod's netns 4. Notifying ztunnel via GRPC to create a proxy for the pod

You may ask why we pass the pod IPs separately from the pod manifest itself (which contains the pod IPs as a field) - this is because during add specifically, if CNI plugins have not finished executing, K8S may get a pod Add event without any IPs in the object, and the pod will later be updated with IPs.

We always need the IPs, but this is fine because this AddPodToMesh can be called from the CNI plugin as well, which always has the firsthand info of the IPs, even before K8S does - so we pass them separately here because we actually may have them before K8S in the Pod object.

func (*NetServer) ConstructInitialSnapshot 

func (s *NetServer) ConstructInitialSnapshot(ambientPods []*corev1.Pod) error

ConstructInitialSnapshot takes a "snapshot" of current ambient pods and

1. Constructs a ztunnel state message to initialize ztunnel 2. Syncs the host ipset

func (*NetServer) DelPodFromMesh 

func (s *NetServer) DelPodFromMesh(ctx context.Context, pod *corev1.Pod) error

Delete pod from mesh: pod is deleted. iptables rules will die with it, we just need to update ztunnel

func (*NetServer) RemovePodFromMesh 

func (s *NetServer) RemovePodFromMesh(ctx context.Context, pod *corev1.Pod) error

Remove pod from mesh: pod is not deleted, we just want to remove it from the mesh.

func (*NetServer) Start 

func (s *NetServer) Start(ctx context.Context)

func (*NetServer) Stop 

func (s *NetServer) Stop()

type Netns 

type Netns interface {
	NetnsFd
	Inode() uint64
}

type NetnsCloser 

type NetnsCloser interface {
	io.Closer
	Netns
}

func OpenNetns 

func OpenNetns(nspath string) (NetnsCloser, error)

type NetnsFd 

type NetnsFd interface {
	Fd() uintptr
}

type NetnsWithFd 

type NetnsWithFd struct {
	// contains filtered or unexported fields
}

func (*NetnsWithFd) Close 

func (n *NetnsWithFd) Close() error

func (*NetnsWithFd) Fd 

func (n *NetnsWithFd) Fd() uintptr

func (*NetnsWithFd) Inode 

func (n *NetnsWithFd) Inode() uint64

type NetnsWrapper 

type NetnsWrapper struct {
	// contains filtered or unexported fields
}

func (*NetnsWrapper) Close 

func (n *NetnsWrapper) Close() error

func (*NetnsWrapper) Fd 

func (n *NetnsWrapper) Fd() uintptr

func (*NetnsWrapper) Inode 

func (n *NetnsWrapper) Inode() uint64

type PartialAddError 

type PartialAddError struct {
	// contains filtered or unexported fields
}

func NewErrPartialAdd 

func NewErrPartialAdd(err error) *PartialAddError

func (*PartialAddError) Error 

func (e *PartialAddError) Error() string

func (*PartialAddError) Unwrap 

func (e *PartialAddError) Unwrap() []error

type PodNetnsCache 

type PodNetnsCache interface {
	ReadCurrentPodSnapshot() map[string]WorkloadInfo
}

type PodNetnsEntry 

type PodNetnsEntry struct {
	// contains filtered or unexported fields
}

type PodNetnsFinder 

type PodNetnsFinder interface {
	FindNetnsForPods(filter map[types.UID]*corev1.Pod) (PodToNetns, error)
}

type PodNetnsProcFinder 

type PodNetnsProcFinder struct {
	// contains filtered or unexported fields
}

func NewPodNetnsProcFinder 

func NewPodNetnsProcFinder(proc fs.FS) *PodNetnsProcFinder

func (*PodNetnsProcFinder) FindNetnsForPods 

func (p *PodNetnsProcFinder) FindNetnsForPods(pods map[types.UID]*corev1.Pod) (PodToNetns, error)

type PodToNetns 

type PodToNetns map[string]WorkloadInfo

func (PodToNetns) Close 

func (p PodToNetns) Close()

type Server 

type Server struct {
	// contains filtered or unexported fields
}

func NewServer 

func NewServer(ctx context.Context, ready *atomic.Value, pluginSocket string, args AmbientArgs) (*Server, error)

func (*Server) NotReady 

func (s *Server) NotReady()

func (*Server) Ready 

func (s *Server) Ready()

func (*Server) Start 

func (s *Server) Start()

func (*Server) Stop 

func (s *Server) Stop()

type WorkloadInfo 

type WorkloadInfo struct {
	Workload *zdsapi.WorkloadInfo
	Netns    NetnsCloser
}

type ZtunnelConnection 

type ZtunnelConnection struct {
	Updates chan updateRequest
	// contains filtered or unexported fields
}

func (*ZtunnelConnection) Close 

func (z *ZtunnelConnection) Close()

type ZtunnelServer 

type ZtunnelServer interface {
	Run(ctx context.Context)
	PodDeleted(ctx context.Context, uid string) error
	PodAdded(ctx context.Context, pod *v1.Pod, netns Netns) error
	Close() error
}

Source Files

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