ื ืืืืฅ. ืืจืึทื ืกื.: ืืขืจ ืืืืจ ืคืื ืืขื ืึทืจืืืงื - Erkan Erol, ืึทื ืื ืืฉืขื ืืจ ืคืื SAP - ืฉืึทืจืขืก ืืืื ืืขืจื ืขื ืคืื ืื ืืขืงืึทื ืืืึทืื ืคืื ืื ืคืึทื ืืงืฉืึทื ืื ื ืคืื ืื ืืึทื ืฉืึทืคึฟื kubectl exec, ืึทืืื ืืึทืงืึทื ื ืฆื ืึทืืขืืขื ืืืืก ืึทืจืืขื ืืื Kubernetes. ืขืจ ืึทืงืึทืืคึผืึทื ืื ืื ืืื ืฆืข ืึทืืืขืจืืืึทื ืืื ืืืกืืื ืืก ืคืื ืื ืงืืืขืจื ืขืืขืก ืืงืืจ ืงืึธื (ืืื ืคึฟืึทืจืืื ืืขื ืข ืคึผืจืึทืืืฉืขืงืก), ืืืึธืก ืืึธืื ืืืจ ืฆื ืคึฟืึทืจืฉืืืื ืื ืืขืืข ืืื ืืืคึผืื ืืื ื ืืืืืง.
ืืืื ืคืจืืืืื ืืื ืฆื ืืืจ ืฆืืืขืงืืืขื ื ืงืืืขืืข ืืื ืืขืคืจืขืื ืืื ืืืื ืืขื ืงืขื ืืืืกืคืืจื ื ืืืคืขื ืืื ื ืคืื ื ืืฆื . ืืื ืงืขื ืืื ื ืืฉื ืขื ืืคึฟืขืจื ืืื ืคึผืืืฆืืื ื ืืืื ืืขืืขื ืึทื ืืื ืืืืกื ืืึธืจื ืืฉื ืืืขืื ืื ืืขืงืึทื ืืืึทื ืคืื ืึทืจืืขื kubectl exec. ืืึธ, ืืื ืืขืืื ืืืืขืจ ืืขืืื ืงืขื ืืืขืื ืืืื ืืืื, ืึธืืขืจ ืืื ืืื ื ืืฉื 100% ืืืืขืจ ืคืื ืืืืขืจ ืจืืืืืง ืืื ืืขืจืืืขืจ ืืึทืฉืืึธืกื ืฆื ืึทืืจืขืก ืืขื ืึทืจืืืกืืขืื. ืืื ืืึธื ืืขืืขืจื ื ืืืึธืืก, ืืึทืงืืืืขื ืืืืฉืึทื ืืื ืืงืืจ ืงืึธื, ืืื ืืขืืขืจื ื ืึท ืคึผืืึทืฅ, ืืื ืืื ืืขื ืึทืจืืืงื ืืื ืืืืื ืฆื ืืืืื ืืืื ืืืกืงืึทืืืขืจืื ืืื ืคืืจืฉืืื ื. ืืืื ืขืคึผืขืก ืืื ืคืึทืืฉ, ืืืืข ืงืึธื ืืึทืงื ืืืจ ืืืึท .
ืืจืึทืื ืื ื
ืฆื ืฉืึทืคึฟื ืึท ืงื ืืื ืืืืฃ ืึท ืืึทืงืืึธืึธืง, ืืื ืงืืึธืื ื . ืืขืจื ืึธื ืืื ืงืขืจืขืงืืึทื ืื IP ืึทืืจืขืกืขืก ืคืื ืื ื ืึธืืื ืืื ืื ืงืืืขืืขืืึท ืงืึทื ืคืืืืขืจืืืฉืึทื, ืืืืึทื ืื ืคืขืืืงืืึทื ืกืขืืืื ืืก ืืึธืื ื ืืฉื ืขืจืืืืื kubectl exec. ืืืจ ืงืขื ื ืืืืขื ืขื ืืขืจ ืืืขืื ืื ืืืืคึผื ืกืืื ืคึฟืึทืจ ืืขื .
- ืงืืื ืืึทืฉืื = ืืืื ืืึทืงืืึธืึธืง
- ืืขื ื ืึธืืข IP = 192.168.205.10
- IP ืึทืจืืขืืขืจ ื ืึธืืข = 192.168.205.11
- ืึทืคึผื ืกืขืจืืืขืจ ืคึผืึธืจื = 6443
ืงืึทืืคึผืึธืื ืึทื ืฅ
- kubectl ืขืงืกืขืง ืคึผืจืึธืฆืขืก: ืืืขื ืืืจ ืืึธื "ืงืืืขืงืื ืขืงืกืขืง ..." ืืขืจ ืคึผืจืึธืฆืขืก ืืื ืกืืึทืจืืขื. ืืืจ ืงืขื ืขื ืืึธื ืืึธืก ืืืืฃ ืงืืื ืืึทืฉืื ืืื ืึทืงืกืขืก ืฆื ืื K8s API ืกืขืจืืืขืจ. ื ืืืืฅ. ืืืืขืจืืขืฆืื ื: ืืืืึทืืขืจ ืืื ืื ืงืึทื ืกืึธืื ืืืกืืื ืืก, ืืขืจ ืืืืจ ื ืืฆื ืืขื ืืึทืืขืจืงืื ื "ืงืืื ืืึทืฉืื", ืืืคึผืืืื ืึทื ืื ืคืืืืขื ืืข ืงืึทืืึทื ืื ืงืขื ืขื ืืืื ืขืงืกืึทืงืืืืึทื ืืืืฃ ืงืืื ืึทืืึท ืืืฉืื ืขื ืืื ืึทืงืกืขืก ืฆื Kubernetes.
- : ื ืงืึธืืคึผืึธื ืขื ื ืืืืฃ ืื ืืขื ื ืึธืืข ืืืึธืก ืืื ืึทืงืกืขืก ืฆื ืื Kubernetes API. ืืึธืก ืืื ืืขืจ ืคืจืึธื ื ืกืืฃ ืคึฟืึทืจ ืื ืงืึธื ืืจืึธื ืคืืึทื ืืื Kubernetes.
- : ืึทืืขื ื ืืืึธืก ืืืืคื ืืืืฃ ืืขืืขืจ ื ืึธืืข ืืื ืืขื ืงื ืืื. ืขืก ืืื ืื ืึทืจืืขื ืคืื ืงืึทื ืืืื ืขืจื ืืื ืื ืคึผืึทื.
- (container ืจืื ืืืืข): ืื ืืืืืืืืืจื ืคืึทืจืึทื ืืืืึธืจืืืขื ืคึฟืึทืจ ืคืืืกื ืืืง ืงืึทื ืืืื ืขืจื. ืืืืฉืคืืื: ืืึธืงืงืขืจ, CRI-O, ืงืึทื ืืืื ืืขืจื ...
- ืงืขืจื: ืึทืก ืงืขืจื ืืืืฃ ืื ืึทืจืืขืืขืจ ื ืึธืืข; ืคืึทืจืึทื ืืืืึธืจืืืขื ืคึฟืึทืจ ืคึผืจืึธืฆืขืก ืคืึทืจืืืึทืืืื ื.
- ืฆืื (ืฆืื) ืงืึทื ืืืื ืขืจ: ืึท ืงืึทื ืืืื ืขืจ ืืืึธืก ืืื ืืืื ืคืื ืึท ืคึผืึธื ืืื ืืืืคื ืืืืฃ ืืืื ืขืจ ืคืื ืื ืึทืจืืขื ื ืึธืืื.
ืืืึธืก ืืึธื ืืื ืืขืคึฟืื ืขื
1. ืึทืงืืืืืืืขื ืืืืฃ ืืขืจ ืงืืืขื ื ืืืึทื
ืฉืึทืคึฟื ืึท ืคึผืึธื ืืื ืึท ื ืึทืืขืกืคึผืึทืกืข default:
// any machine
$ kubectl run exec-test-nginx --image=nginxืืขืจื ืึธื ืืืจ ืืืกืคืืจื ืื ืขืงืกืขืง ืืึทืคึฟืขื ืืื ืืืึทืจืื 5000 ืกืขืงืื ืืขืก ืคึฟืึทืจ ืืืืึทืืขืจ ืึทืืืขืจืืืืืฉืึทื ื:
// any machine
$ kubectl exec -it exec-test-nginx-6558988d5-fgxgg -- sh
# sleep 5000ืืขืจ ืงืืืขืงืื ืคึผืจืึธืฆืขืก ืืื ืืจืืืก (ืืื ืคึผืื = 8507 ืืื ืืื ืืืขืจ ืคืึทื):
// any machine
$ ps -ef |grep kubectl
501 8507 8409 0 7:19PM ttys000 0:00.13 kubectl exec -it exec-test-nginx-6558988d5-fgxgg -- shืืืื ืืืจ ืงืึธื ืืจืึธืืืจื ืื ื ืขืฅ ืืขืืืงืืื ืคืื ืืขื ืคึผืจืึธืฆืขืก, ืืืจ ืืืขืื ืืขืคึฟืื ืขื ืึทื ืขืก ืืื ืงืึทื ืขืงืฉืึทื ื ืฆื ืื ืึทืคึผื ืกืขืจืืืขืจ (192.168.205.10.6443):
// any machine
$ netstat -atnv |grep 8507
tcp4 0 0 192.168.205.1.51673 192.168.205.10.6443 ESTABLISHED 131072 131768 8507 0 0x0102 0x00000020
tcp4 0 0 192.168.205.1.51672 192.168.205.10.6443 ESTABLISHED 131072 131768 8507 0 0x0102 0x00000028ืืื ืก ืงืืง ืืื ืื ืงืึธื. Kubectl ืงืจืืืืฅ ืึท POST ืืขืื ืืื ืึทื ืขืงืกืขืง ืกืืืจืขืกืึธืจืก ืืื ืกืขื ืื ืึท REST ืืขืื:
req := restClient.Post().
Resource("pods").
Name(pod.Name).
Namespace(pod.Namespace).
SubResource("exec")
req.VersionedParams(&corev1.PodExecOptions{
Container: containerName,
Command: p.Command,
Stdin: p.Stdin,
Stdout: p.Out != nil,
Stderr: p.ErrOut != nil,
TTY: t.Raw,
}, scheme.ParameterCodec)
return p.Executor.Execute("POST", req.URL(), p.Config, p.In, p.Out, p.ErrOut, t.Raw, sizeQueue)()
2. ืึทืงืืืืืืืขื ืืืืฃ ืื ืืืึทื ืคืื ืื ืืขื ื ืึธืืข
ืืืจ ืงืขื ืขื ืืืื ืึธืืกืขืจืืืืจื ืื ืืงืฉื ืืืืฃ ืื ืึทืคึผื-ืกืขืจืืืขืจ ืืืึทื:
handler.go:143] kube-apiserver: POST "/api/v1/namespaces/default/pods/exec-test-nginx-6558988d5-fgxgg/exec" satisfied by gorestful with webservice /api/v1
upgradeaware.go:261] Connecting to backend proxy (intercepting redirects) https://192.168.205.11:10250/exec/default/exec-test-nginx-6558988d5-fgxgg/exec-test-nginx?command=sh&input=1&output=1&tty=1
Headers: map[Connection:[Upgrade] Content-Length:[0] Upgrade:[SPDY/3.1] User-Agent:[kubectl/v1.12.10 (darwin/amd64) kubernetes/e3c1340] X-Forwarded-For:[192.168.205.1] X-Stream-Protocol-Version:[v4.channel.k8s.io v3.channel.k8s.io v2.channel.k8s.io channel.k8s.io]]ืืึทืืขืจืงืื ื ืึทื ืื ืืืืคึผ ืืขืื ืืืื ืึท ืคึผืจืึธืืึธืงืึธื ืืืืฉื ืืขืื. ืึทืืึทืื ืืึทืืื ืืขืจ "ืกืืจืืื" ืคืื ืกืืืื/ืกืืืึธืื/ืกืืืขืจืจ/ืกืคึผืื-ืืขืืช ืฆื ืืืื ืืืืืืคึผืืขืงืกืขื ืืืืขืจ ืึท ืืืื ืืงืคึผ ืงืฉืจ.
ืืขืจ ืึทืคึผื ืกืขืจืืืขืจ ื ืขืื ืื ืืงืฉื ืืื ืงืึทื ืืืขืจืฅ ืขืก ืฆื PodExecOptions:
// PodExecOptions is the query options to a Pod's remote exec call
type PodExecOptions struct {
metav1.TypeMeta
// Stdin if true indicates that stdin is to be redirected for the exec call
Stdin bool
// Stdout if true indicates that stdout is to be redirected for the exec call
Stdout bool
// Stderr if true indicates that stderr is to be redirected for the exec call
Stderr bool
// TTY if true indicates that a tty will be allocated for the exec call
TTY bool
// Container in which to execute the command.
Container string
// Command is the remote command to execute; argv array; not executed within a shell.
Command []string
}()
ืฆื ืืืจืืคืืจื ืื ืคืืจืืื ืื ืึทืงืฉืึทื ื, ืืขืจ ืึทืคึผื-ืกืขืจืืืขืจ ืืึทืจืฃ ืืืืกื ืืืึธืก ืคึผืึธื ืขืก ืืึทืจืฃ ืฆื ืงืึธื ืืึทืงื:
// ExecLocation returns the exec URL for a pod container. If opts.Container is blank
// and only one container is present in the pod, that container is used.
func ExecLocation(
getter ResourceGetter,
connInfo client.ConnectionInfoGetter,
ctx context.Context,
name string,
opts *api.PodExecOptions,
) (*url.URL, http.RoundTripper, error) {
return streamLocation(getter, connInfo, ctx, name, opts, opts.Container, "exec")
}()
ืคืื ืงืืจืก, ืื ืืึทืื ืืืขืื ืื ืขื ืืคึผืืื ื ืืขื ืขื ืืขื ืืืขื ืคึฟืื ืื ืืื ืคึฟืึธืจืืึทืฆืืข ืืืขืื ืื ื ืึธืืข:
nodeName := types.NodeName(pod.Spec.NodeName)
if len(nodeName) == 0 {
// If pod has not been assigned a host, return an empty location
return nil, nil, errors.NewBadRequest(fmt.Sprintf("pod %s does not have a host assigned", name))
}
nodeInfo, err := connInfo.GetConnectionInfo(ctx, nodeName)()
ืืืจืื! Kubelet ืืื ืืืฆื ืึท ืคึผืึธืจื (node.Status.DaemonEndpoints.KubeletEndpoint.Port) ืฆื ืืืึธืก ืื API ืกืขืจืืืขืจ ืงืขื ืขื ืคืึทืจืืื ืื:
// GetConnectionInfo retrieves connection info from the status of a Node API object.
func (k *NodeConnectionInfoGetter) GetConnectionInfo(ctx context.Context, nodeName types.NodeName) (*ConnectionInfo, error) {
node, err := k.nodes.Get(ctx, string(nodeName), metav1.GetOptions{})
if err != nil {
return nil, err
}
// Find a kubelet-reported address, using preferred address type
host, err := nodeutil.GetPreferredNodeAddress(node, k.preferredAddressTypes)
if err != nil {
return nil, err
}
// Use the kubelet-reported port, if present
port := int(node.Status.DaemonEndpoints.KubeletEndpoint.Port)
if port <= 0 {
port = k.defaultPort
}
return &ConnectionInfo{
Scheme: k.scheme,
Hostname: host,
Port: strconv.Itoa(port),
Transport: k.transport,
}, nil
}()
ืคึฟืื ืืึทืงืืืืขื ืืืืฉืึทื :
ืื ืงืึทื ืขืงืฉืึทื ื ืืขื ืขื ืืขืจืืึทื ืืืืื ืืืึท ืื ืงืืืขืืขื ืก ืืืืคึผืก ืขื ืืคึผืืื ื. ืืืจื ืคืขืืืงืืึทื, ืึทืคึผืืกืขืจืืืขืจ ืงืขื ื ืืฉื ืืึทืฉืืขืืืงื ืื ืงืืืขืืขื ืก ืืึทืืืืึทืื, ืืืึธืก ืืืื ืื ืงืฉืจ ืฉืคึผืืจืขืืืืืง ืคึฟืึทืจ "ืืขื ืืฉ-ืืื-ืื-ืืืื ืื ืคืืื" (MITM) ืืื ืืืืืืืขืจ ืฆื ืึทืจืืขืื ืืื ืึทื ืืจืึทืกืืื ืืื / ืึธืืขืจ ืขืคื ืืืขื ื ืขืืืืึธืจืงืก.
ืืืฆื ืืขืจ ืึทืคึผื ืกืขืจืืืขืจ ืืืืืกื ืื ืขื ืืคึผืืื ื ืืื ืืกืืึทืืืืฉืื ืึท ืงืฉืจ:
// Connect returns a handler for the pod exec proxy
func (r *ExecREST) Connect(ctx context.Context, name string, opts runtime.Object, responder rest.Responder) (http.Handler, error) {
execOpts, ok := opts.(*api.PodExecOptions)
if !ok {
return nil, fmt.Errorf("invalid options object: %#v", opts)
}
location, transport, err := pod.ExecLocation(r.Store, r.KubeletConn, ctx, name, execOpts)
if err != nil {
return nil, err
}
return newThrottledUpgradeAwareProxyHandler(location, transport, false, true, true, responder), nil
}()
ืืื ืก ืืขื ืืืึธืก ืืึทืคึผืึทื ื ืืืืฃ ืื ืืขื ื ืึธืืข.
ืขืจืฉืืขืจ, ืืขืคึฟืื ืขื ืื IP ืคืื ืื ืึทืจืืขื ื ืึธืืข. ืืื ืืื ืืืขืจ ืคืึทื, ืืึธืก ืืื 192.168.205.11:
// any machine
$ kubectl get nodes k8s-node-1 -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
k8s-node-1 Ready <none> 9h v1.15.3 192.168.205.11 <none> Ubuntu 16.04.6 LTS 4.4.0-159-generic docker://17.3.3ืืขืจื ืึธื ืฉืืขืื ืื ืงืืืขืืขื ืคึผืึธืจื (10250 ืืื ืืื ืืืขืจ ืคืึทื):
// any machine
$ kubectl get nodes k8s-node-1 -o jsonpath='{.status.daemonEndpoints.kubeletEndpoint}'
map[Port:10250]
ืืืฆื ืขืก ืืื ืฆืืื ืฆื ืคึผืจืืืืจื ืื ื ืขืฅ. ืืื ืขืก ืึท ืงืฉืจ ืฆื ืื ืึทืจืืขืืขืจ ื ืึธืืข (192.168.205.11)? ืขืก ืืื! ืืืื ืืืจ "ืืืืื" ืืขื ืคึผืจืึธืฆืขืก exec, ืขืก ืืืขื ืคืึทืจืฉืืืื ืื, ืึทืืื ืืื ืืืืกื ืึทื ืื ืงืฉืจ ืืื ืืขืืจืื ืืขื ืืืจื ืื ืึทืคึผื-ืกืขืจืืืขืจ ืืื ืึท ืจืขืืืืืึทื ืคืื ืื ืขืงืกืึทืงืืืืึทื ืขืงืกืขืง ืืึทืคึฟืขื.
// master node
$ netstat -atn |grep 192.168.205.11
tcp 0 0 192.168.205.10:37870 192.168.205.11:10250 ESTABLISHED
โฆ
ืืขืจ ืงืฉืจ ืฆืืืืฉื kubectl ืืื api-server ืืื ื ืึธื ืึธืคื. ืืื ืึทืืืฉืึทื, ืขืก ืืื ืื ืื ืืขืจ ืงืฉืจ ืงืึทื ืขืงืืื ื ืึทืคึผื-ืกืขืจืืืขืจ ืืื ืงืืืขืืขื.
3. ืืขืืืงืืื ืืืืฃ ืื ืึทืจืืขืืขืจ ื ืึธืืข
ืืืฆื ืืึธืื ืืื ืื ืคืึทืจืืื ืื ืฆื ืื ืึทืจืืขืืขืจ ื ืึธืืข ืืื ืืขื ืืืึธืก ืืื ืืขืฉืขืขื ืืฉ ืืืืฃ ืืื.
ืขืจืฉืื ืก, ืืขืขื ืืืจ, ืึทื ืืขืจ ืคึฟืึทืจืืื ืืื ื ืฆื ืืื ืืื ืืืื ืืขืืจืื ืืขื (ืฆืืืืืืข ืฉืืจื); 192.168.205.10 ืืื ืื IP ืคืื ืื ืืขื ื ืึธืืข:
// worker node
$ netstat -atn |grep 10250
tcp6 0 0 :::10250 :::* LISTEN
tcp6 0 0 192.168.205.11:10250 192.168.205.10:37870 ESTABLISHED
ืืืึธืก ืืืขืื ืืื ืืืขืจ ืืึทื ืฉืึทืคึฟื sleep? ืืืจื, ืื ืืื ืืืื ืืืจื!
// worker node
$ ps -afx
...
31463 ? Sl 0:00 _ docker-containerd-shim 7d974065bbb3107074ce31c51f5ef40aea8dcd535ae11a7b8f2dd180b8ed583a /var/run/docker/libcontainerd/7d974065bbb3107074ce31c51
31478 pts/0 Ss 0:00 _ sh
31485 pts/0 S+ 0:00 _ sleep 5000
โฆืืืขืจ ืืืืจื, ืืื ืืืื ืืื ืงืืืขืืขื ืืืก ืืจืืคืืขื ืืืขื? ืื ืงืืืขืืขื ืืื ืึท ืืืืืึทื ืืืึธืก ืขืคึฟื ื ืึทืงืกืขืก ืฆื ืื API ืืืจื ืื ืคึผืึธืจื ืคึฟืึทืจ ืึทืคึผื-ืกืขืจืืืขืจ ืจืืงืืืขืก:
// Server is the library interface to serve the stream requests.
type Server interface {
http.Handler
// Get the serving URL for the requests.
// Requests must not be nil. Responses may be nil iff an error is returned.
GetExec(*runtimeapi.ExecRequest) (*runtimeapi.ExecResponse, error)
GetAttach(req *runtimeapi.AttachRequest) (*runtimeapi.AttachResponse, error)
GetPortForward(*runtimeapi.PortForwardRequest) (*runtimeapi.PortForwardResponse, error)
// Start the server.
// addr is the address to serve on (address:port) stayUp indicates whether the server should
// listen until Stop() is called, or automatically stop after all expected connections are
// closed. Calling Get{Exec,Attach,PortForward} increments the expected connection count.
// Function does not return until the server is stopped.
Start(stayUp bool) error
// Stop the server, and terminate any open connections.
Stop() error
}()
Kubelet ืงืึทืืงืืึทืืืืฅ ืื ืขื ืืคืขืจ ืขื ืืคึผืืื ื ืคึฟืึทืจ ืขืงืกืขืง ืจืืงืืืขืก:
func (s *server) GetExec(req *runtimeapi.ExecRequest) (*runtimeapi.ExecResponse, error) {
if err := validateExecRequest(req); err != nil {
return nil, err
}
token, err := s.cache.Insert(req)
if err != nil {
return nil, err
}
return &runtimeapi.ExecResponse{
Url: s.buildURL("exec", token),
}, nil
}()
ืฆื ื ืื ืฆืขืืืฉื. ืขืก ืงืขื ื ืืฉื ืฆืืจืืงืงืืืขื ืื ืจืขืืืืืึทื ืคืื ืื ืืึทืคึฟืขื, ืึธืืขืจ ืื ืขื ืืคึผืืื ื ืคึฟืึทืจ ืื ืงืฉืจ:
type ExecResponse struct {
// Fully qualified URL of the exec streaming server.
Url string `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_sizecache int32 `json:"-"`
}()
Kubelet ืืืคึผืืึทืืึทื ืฅ ืึท ืฆืืืื ื RuntimeServiceClient, ืืืึธืก ืืื ืืืื ืคืื ืื ืงืึทื ืืืื ืขืจ ืจืื ืืืืข ืฆืืืื ื (ืืืจ ืืขืฉืจืืื ืืขืจ ืืืขืื ืืื, ืืืฉื, - ืืขืขืจืขื. ืืืืขืจืืขืฆื):
ืืื ื ืืืกืืื ื ืคืื ืงืจื-ืึทืคึผื ืืื ืงืืืขืจื ืขืืขืก / ืงืืืขืจื ืขืืขืก
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
type RuntimeServiceClient interface {
// Version returns the runtime name, runtime version, and runtime API version.
Version(ctx context.Context, in *VersionRequest, opts ...grpc.CallOption) (*VersionResponse, error)
// RunPodSandbox creates and starts a pod-level sandbox. Runtimes must ensure
// the sandbox is in the ready state on success.
RunPodSandbox(ctx context.Context, in *RunPodSandboxRequest, opts ...grpc.CallOption) (*RunPodSandboxResponse, error)
// StopPodSandbox stops any running process that is part of the sandbox and
// reclaims network resources (e.g., IP addresses) allocated to the sandbox.
// If there are any running containers in the sandbox, they must be forcibly
// terminated.
// This call is idempotent, and must not return an error if all relevant
// resources have already been reclaimed. kubelet will call StopPodSandbox
// at least once before calling RemovePodSandbox. It will also attempt to
// reclaim resources eagerly, as soon as a sandbox is not needed. Hence,
// multiple StopPodSandbox calls are expected.
StopPodSandbox(ctx context.Context, in *StopPodSandboxRequest, opts ...grpc.CallOption) (*StopPodSandboxResponse, error)
// RemovePodSandbox removes the sandbox. If there are any running containers
// in the sandbox, they must be forcibly terminated and removed.
// This call is idempotent, and must not return an error if the sandbox has
// already been removed.
RemovePodSandbox(ctx context.Context, in *RemovePodSandboxRequest, opts ...grpc.CallOption) (*RemovePodSandboxResponse, error)
// PodSandboxStatus returns the status of the PodSandbox. If the PodSandbox is not
// present, returns an error.
PodSandboxStatus(ctx context.Context, in *PodSandboxStatusRequest, opts ...grpc.CallOption) (*PodSandboxStatusResponse, error)
// ListPodSandbox returns a list of PodSandboxes.
ListPodSandbox(ctx context.Context, in *ListPodSandboxRequest, opts ...grpc.CallOption) (*ListPodSandboxResponse, error)
// CreateContainer creates a new container in specified PodSandbox
CreateContainer(ctx context.Context, in *CreateContainerRequest, opts ...grpc.CallOption) (*CreateContainerResponse, error)
// StartContainer starts the container.
StartContainer(ctx context.Context, in *StartContainerRequest, opts ...grpc.CallOption) (*StartContainerResponse, error)
// StopContainer stops a running container with a grace period (i.e., timeout).
// This call is idempotent, and must not return an error if the container has
// already been stopped.
// TODO: what must the runtime do after the grace period is reached?
StopContainer(ctx context.Context, in *StopContainerRequest, opts ...grpc.CallOption) (*StopContainerResponse, error)
// RemoveContainer removes the container. If the container is running, the
// container must be forcibly removed.
// This call is idempotent, and must not return an error if the container has
// already been removed.
RemoveContainer(ctx context.Context, in *RemoveContainerRequest, opts ...grpc.CallOption) (*RemoveContainerResponse, error)
// ListContainers lists all containers by filters.
ListContainers(ctx context.Context, in *ListContainersRequest, opts ...grpc.CallOption) (*ListContainersResponse, error)
// ContainerStatus returns status of the container. If the container is not
// present, returns an error.
ContainerStatus(ctx context.Context, in *ContainerStatusRequest, opts ...grpc.CallOption) (*ContainerStatusResponse, error)
// UpdateContainerResources updates ContainerConfig of the container.
UpdateContainerResources(ctx context.Context, in *UpdateContainerResourcesRequest, opts ...grpc.CallOption) (*UpdateContainerResourcesResponse, error)
// ReopenContainerLog asks runtime to reopen the stdout/stderr log file
// for the container. This is often called after the log file has been
// rotated. If the container is not running, container runtime can choose
// to either create a new log file and return nil, or return an error.
// Once it returns error, new container log file MUST NOT be created.
ReopenContainerLog(ctx context.Context, in *ReopenContainerLogRequest, opts ...grpc.CallOption) (*ReopenContainerLogResponse, error)
// ExecSync runs a command in a container synchronously.
ExecSync(ctx context.Context, in *ExecSyncRequest, opts ...grpc.CallOption) (*ExecSyncResponse, error)
// Exec prepares a streaming endpoint to execute a command in the container.
Exec(ctx context.Context, in *ExecRequest, opts ...grpc.CallOption) (*ExecResponse, error)
// Attach prepares a streaming endpoint to attach to a running container.
Attach(ctx context.Context, in *AttachRequest, opts ...grpc.CallOption) (*AttachResponse, error)
// PortForward prepares a streaming endpoint to forward ports from a PodSandbox.
PortForward(ctx context.Context, in *PortForwardRequest, opts ...grpc.CallOption) (*PortForwardResponse, error)
// ContainerStats returns stats of the container. If the container does not
// exist, the call returns an error.
ContainerStats(ctx context.Context, in *ContainerStatsRequest, opts ...grpc.CallOption) (*ContainerStatsResponse, error)
// ListContainerStats returns stats of all running containers.
ListContainerStats(ctx context.Context, in *ListContainerStatsRequest, opts ...grpc.CallOption) (*ListContainerStatsResponse, error)
// UpdateRuntimeConfig updates the runtime configuration based on the given request.
UpdateRuntimeConfig(ctx context.Context, in *UpdateRuntimeConfigRequest, opts ...grpc.CallOption) (*UpdateRuntimeConfigResponse, error)
// Status returns the status of the runtime.
Status(ctx context.Context, in *StatusRequest, opts ...grpc.CallOption) (*StatusResponse, error)
}
()
ืขืก ื ืึธืจ ื ืืฆื gRPC ืฆื ืจืืคื ืืขื ืืืคึฟื ืืืจื ืื ืงืึทื ืืืื ืขืจ ืจืื ืืืืข ืฆืืืื ื:
type runtimeServiceClient struct {
cc *grpc.ClientConn
}()
func (c *runtimeServiceClient) Exec(ctx context.Context, in *ExecRequest, opts ...grpc.CallOption) (*ExecResponse, error) {
out := new(ExecResponse)
err := c.cc.Invoke(ctx, "/runtime.v1alpha2.RuntimeService/Exec", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}()
ืงืึทื ืืืื ืขืจ ืจืื ืืืืข ืืื ืคืึทืจืึทื ืืืืึธืจืืืขื ืคึฟืึทืจ ืื ืืืคึผืืึทืืขื ืืืืฉืึทื RuntimeServiceServer:
ืืื ื ืืืกืืื ื ืคืื ืงืจื-ืึทืคึผื ืืื ืงืืืขืจื ืขืืขืก / ืงืืืขืจื ืขืืขืก
// RuntimeServiceServer is the server API for RuntimeService service.
type RuntimeServiceServer interface {
// Version returns the runtime name, runtime version, and runtime API version.
Version(context.Context, *VersionRequest) (*VersionResponse, error)
// RunPodSandbox creates and starts a pod-level sandbox. Runtimes must ensure
// the sandbox is in the ready state on success.
RunPodSandbox(context.Context, *RunPodSandboxRequest) (*RunPodSandboxResponse, error)
// StopPodSandbox stops any running process that is part of the sandbox and
// reclaims network resources (e.g., IP addresses) allocated to the sandbox.
// If there are any running containers in the sandbox, they must be forcibly
// terminated.
// This call is idempotent, and must not return an error if all relevant
// resources have already been reclaimed. kubelet will call StopPodSandbox
// at least once before calling RemovePodSandbox. It will also attempt to
// reclaim resources eagerly, as soon as a sandbox is not needed. Hence,
// multiple StopPodSandbox calls are expected.
StopPodSandbox(context.Context, *StopPodSandboxRequest) (*StopPodSandboxResponse, error)
// RemovePodSandbox removes the sandbox. If there are any running containers
// in the sandbox, they must be forcibly terminated and removed.
// This call is idempotent, and must not return an error if the sandbox has
// already been removed.
RemovePodSandbox(context.Context, *RemovePodSandboxRequest) (*RemovePodSandboxResponse, error)
// PodSandboxStatus returns the status of the PodSandbox. If the PodSandbox is not
// present, returns an error.
PodSandboxStatus(context.Context, *PodSandboxStatusRequest) (*PodSandboxStatusResponse, error)
// ListPodSandbox returns a list of PodSandboxes.
ListPodSandbox(context.Context, *ListPodSandboxRequest) (*ListPodSandboxResponse, error)
// CreateContainer creates a new container in specified PodSandbox
CreateContainer(context.Context, *CreateContainerRequest) (*CreateContainerResponse, error)
// StartContainer starts the container.
StartContainer(context.Context, *StartContainerRequest) (*StartContainerResponse, error)
// StopContainer stops a running container with a grace period (i.e., timeout).
// This call is idempotent, and must not return an error if the container has
// already been stopped.
// TODO: what must the runtime do after the grace period is reached?
StopContainer(context.Context, *StopContainerRequest) (*StopContainerResponse, error)
// RemoveContainer removes the container. If the container is running, the
// container must be forcibly removed.
// This call is idempotent, and must not return an error if the container has
// already been removed.
RemoveContainer(context.Context, *RemoveContainerRequest) (*RemoveContainerResponse, error)
// ListContainers lists all containers by filters.
ListContainers(context.Context, *ListContainersRequest) (*ListContainersResponse, error)
// ContainerStatus returns status of the container. If the container is not
// present, returns an error.
ContainerStatus(context.Context, *ContainerStatusRequest) (*ContainerStatusResponse, error)
// UpdateContainerResources updates ContainerConfig of the container.
UpdateContainerResources(context.Context, *UpdateContainerResourcesRequest) (*UpdateContainerResourcesResponse, error)
// ReopenContainerLog asks runtime to reopen the stdout/stderr log file
// for the container. This is often called after the log file has been
// rotated. If the container is not running, container runtime can choose
// to either create a new log file and return nil, or return an error.
// Once it returns error, new container log file MUST NOT be created.
ReopenContainerLog(context.Context, *ReopenContainerLogRequest) (*ReopenContainerLogResponse, error)
// ExecSync runs a command in a container synchronously.
ExecSync(context.Context, *ExecSyncRequest) (*ExecSyncResponse, error)
// Exec prepares a streaming endpoint to execute a command in the container.
Exec(context.Context, *ExecRequest) (*ExecResponse, error)
// Attach prepares a streaming endpoint to attach to a running container.
Attach(context.Context, *AttachRequest) (*AttachResponse, error)
// PortForward prepares a streaming endpoint to forward ports from a PodSandbox.
PortForward(context.Context, *PortForwardRequest) (*PortForwardResponse, error)
// ContainerStats returns stats of the container. If the container does not
// exist, the call returns an error.
ContainerStats(context.Context, *ContainerStatsRequest) (*ContainerStatsResponse, error)
// ListContainerStats returns stats of all running containers.
ListContainerStats(context.Context, *ListContainerStatsRequest) (*ListContainerStatsResponse, error)
// UpdateRuntimeConfig updates the runtime configuration based on the given request.
UpdateRuntimeConfig(context.Context, *UpdateRuntimeConfigRequest) (*UpdateRuntimeConfigResponse, error)
// Status returns the status of the runtime.
Status(context.Context, *StatusRequest) (*StatusResponse, error)
}
()
ืืืื ืึทืืื, ืืืจ ืืึธื ืืขื ืึท ืงืฉืจ ืฆืืืืฉื ืื ืงืืืขืืขื ืืื ืื ืงืึทื ืืืื ืขืจ ืจืื ืืืืข, ืจืขืื? ืืื ืก ืืฉืขืง.
ืืืืคื ืืขื ืืึทืคึฟืขื ืืืืืขืจ ืืื ื ืึธื ืื ืขืงืกืขืง ืืึทืคึฟืขื ืืื ืืขื ืื ืืืืืง. ืืื ืืืื ืคืึทื, ืื ืืืืืง ืืื:
// worker node
$ ss -a -p |grep kubelet
...
u_str ESTAB 0 0 * 157937 * 157387 users:(("kubelet",pid=5714,fd=33))
...ืืืื... ื ืื ืืื ืืงืก ืืึธืืขื ืคึฟืึทืจืืื ืืื ื ืฆืืืืฉื ืงืืืขืืขื (ืคึผืื = 5714) ืืื ืขืคึผืขืก ืืืืืึทืงืึทื ื. ืืืึธืก ืงืขื ืขืก ืืืื? ืืึธืก ืืื ืจืขืื, ืืึธืก ืืื ืืึธืงืขืจ (ืคึผืื = 1186)!
// worker node
$ ss -a -p |grep 157387
...
u_str ESTAB 0 0 * 157937 * 157387 users:(("kubelet",pid=5714,fd=33))
u_str ESTAB 0 0 /var/run/docker.sock 157387 * 157937 users:(("dockerd",pid=1186,fd=14))
...ืืื ืืืจ ืืขืืขื ืงืขื, ืืึธืก ืืื ืืขืจ ืืึธืงืงืขืจ ืืืืืึทื ืคึผืจืึธืฆืขืก (ืคึผืื = 1186) ืืืึธืก ืขืงืกืึทืงืืืฅ ืืื ืืืขืจ ืืึทืคึฟืขื:
// worker node
$ ps -afx
...
1186 ? Ssl 0:55 /usr/bin/dockerd -H fd://
17784 ? Sl 0:00 _ docker-containerd-shim 53a0a08547b2f95986402d7f3b3e78702516244df049ba6c5aa012e81264aa3c /var/run/docker/libcontainerd/53a0a08547b2f95986402d7f3
17801 pts/2 Ss 0:00 _ sh
17827 pts/2 S+ 0:00 _ sleep 5000
...4. ืึทืงืืืืืืืขื ืืื ืืขื ืงืึทื ืืืื ืขืจ ืจืื ืืืืข
ืืึธืืืจ ืื ืืขืจืืืื ืื CRI-O ืืงืืจ ืงืึธื ืฆื ืคึฟืึทืจืฉืืืื ืืืึธืก ืืื ืืขืฉืขืขื ืืฉ. ืืื ืืึธืงืขืจ, ืื ืืึธืืืง ืืื ืขื ืืขื.
ืขืก ืืื ืึท ืกืขืจืืืขืจ ืคืึทืจืึทื ืืืืึธืจืืืขื ืคึฟืึทืจ ืื ืืืคึผืืึทืืขื ืืืืฉืึทื RuntimeServiceServer:
// Server implements the RuntimeService and ImageService
type Server struct {
config libconfig.Config
seccompProfile *seccomp.Seccomp
stream StreamService
netPlugin ocicni.CNIPlugin
hostportManager hostport.HostPortManager
appArmorProfile string
hostIP string
bindAddress string
*lib.ContainerServer
monitorsChan chan struct{}
defaultIDMappings *idtools.IDMappings
systemContext *types.SystemContext // Never nil
updateLock sync.RWMutex
seccompEnabled bool
appArmorEnabled bool
}()
// Exec prepares a streaming endpoint to execute a command in the container.
func (s *Server) Exec(ctx context.Context, req *pb.ExecRequest) (resp *pb.ExecResponse, err error) {
const operation = "exec"
defer func() {
recordOperation(operation, time.Now())
recordError(operation, err)
}()
resp, err = s.getExec(req)
if err != nil {
return nil, fmt.Errorf("unable to prepare exec endpoint: %v", err)
}
return resp, nil
}()
ืืื ืื ืกืืฃ ืคืื ืื ืงืืื, ืื ืงืึทื ืืืื ืขืจ ืจืื ืืืืข ืขืงืกืึทืงืืืฅ ืื ืืึทืคึฟืขื ืืืืฃ ืื ืึทืจืืขืืขืจ ื ืึธืืข:
// ExecContainer prepares a streaming endpoint to execute a command in the container.
func (r *runtimeOCI) ExecContainer(c *Container, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize) error {
processFile, err := prepareProcessExec(c, cmd, tty)
if err != nil {
return err
}
defer os.RemoveAll(processFile.Name())
args := []string{rootFlag, r.root, "exec"}
args = append(args, "--process", processFile.Name(), c.ID())
execCmd := exec.Command(r.path, args...)
if v, found := os.LookupEnv("XDG_RUNTIME_DIR"); found {
execCmd.Env = append(execCmd.Env, fmt.Sprintf("XDG_RUNTIME_DIR=%s", v))
}
var cmdErr, copyError error
if tty {
cmdErr = ttyCmd(execCmd, stdin, stdout, resize)
} else {
if stdin != nil {
// Use an os.Pipe here as it returns true *os.File objects.
// This way, if you run 'kubectl exec <pod> -i bash' (no tty) and type 'exit',
// the call below to execCmd.Run() can unblock because its Stdin is the read half
// of the pipe.
r, w, err := os.Pipe()
if err != nil {
return err
}
go func() { _, copyError = pools.Copy(w, stdin) }()
execCmd.Stdin = r
}
if stdout != nil {
execCmd.Stdout = stdout
}
if stderr != nil {
execCmd.Stderr = stderr
}
cmdErr = execCmd.Run()
}
if copyError != nil {
return copyError
}
if exitErr, ok := cmdErr.(*exec.ExitError); ok {
return &utilexec.ExitErrorWrapper{ExitError: exitErr}
}
return cmdErr
}()
ืฆืื ืกืืฃ, ืืขืจ ืงืขืจื ืขืงืกืึทืงืืืฅ ืื ืงืึทืืึทื ืื:
ืืขืจืืึธื ืื ืืขื
- ืื ืึทืคึผื ืกืขืจืืืืจืขืจ ืงืขื ืขื ืืืื ืื ืืฉืึทืืืื ืึท ืงืฉืจ ืฆื ืึท ืงืืืขืืขื.
- ืื ืคืืืืขื ืืข ืงืึทื ืขืงืฉืึทื ื ืึธื ืืึทืืื ืืื ืืขื ืกืืฃ ืคืื ืื ืื ืืขืจืึทืงืืืื ืขืงืกืขืงืืืืืืข ืกืขืกืืข:
- ืฆืืืืฉื kubectl ืืื api-server;
- ืฆืืืืฉื ืึทืคึผื-ืกืขืจืืืขืจ ืืื ืงืืืขืงืื;
- ืฆืืืืฉื ืื ืงืืืขืืขื ืืื ืื ืงืึทื ืืืื ืขืจ ืจืื ืืืืข.
- Kubectl ืึธืืขืจ ืึทืคึผื-ืกืขืจืืืขืจ ืงืขื ืขื ื ืืฉื ืืืืคื ืขืคึผืขืก ืืืืฃ ืึทืจืืขื ื ืึธืืื. ื ืงืืืขืืขื ืงืขื ืขื ืืืืคื, ืึธืืขืจ ืขืก ืืืื ืื ืืขืจืึทืงืฅ ืืื ืื ืจืื ืืืืข ืคืื โโืืขื ืงืึทื ืืืื ืขืจ ืคึฟืึทืจ ืื ืึทืงืฉืึทื ื.
ืจืขืกืืจืกื
- ืืืกืงืืกืืข "ยป ืืื kubernetes-dev;
- ืึทืจืืืงื "";
- ืืืกืงืืกืืข "ยป ืืืืฃ ืกืขืจืืืืจืขืจ ืฉืืื.
ืคึผืก ืคืื ืืืืขืจืืขืฆืขืจ
ืืืืขื ืขื ืืืื ืืืืฃ ืืื ืืืขืจ ืืืึธื:
- "ืืืึธืก ืืึทืคึผืึทื ื ืืื ืงืืืขืจื ืขืืขืก ืืืขื ืืืจ ืืืืคื ืงืืืขืงืื ืืืืคื?" ะธ ;
- ยซ";
- ยซ";
- ยซ'.
ืืงืืจ: www.habr.com