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Merge pull request #44 from cccfs/feat-dev
feat: add pid2pod command
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| /* | ||
| Copyright (c) 2020 CyberArk Software Ltd. All rights reserved | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
| package pid2pod | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "github.com/jedib0t/go-pretty/table" | ||
| "os" | ||
| "regexp" | ||
| "strings" | ||
| ) | ||
|
|
||
| // ID identifies a single container running in a Kubernetes Pod | ||
| type ID struct { | ||
| Namespace string | ||
| PodName string | ||
| //ContainerID string | ||
| ContainerName string | ||
| } | ||
|
|
||
| // LookupPod looks up a process ID from the host PID namespace, returning its Kubernetes identity. | ||
| func LookupPod(pid int, executable string, podInfo *podList, tw table.Writer) (*ID, error) { | ||
| cid, err := LookupContainerID(pid) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| var containerRuntime string | ||
| pidAndProcExecutable := fmt.Sprintf("%d (%s)", pid, executable) | ||
| for _, item := range podInfo.Items { | ||
| for _, status := range item.Status.ContainerStatuses { | ||
| if strings.Contains(status.ContainerID, "containerd") { | ||
| containerRuntime = "containerd" | ||
| } | ||
| if strings.Contains(status.ContainerID, "docker") { | ||
| containerRuntime = "docker" | ||
| } | ||
| containerID := fmt.Sprintf("%s://%s", containerRuntime, cid) | ||
| if status.ContainerID == containerID { | ||
| tw.AppendRow([]interface{}{pidAndProcExecutable, item.Metadata.Name, item.Metadata.Namespace, status.Name}) | ||
| return &ID{ | ||
| Namespace: item.Metadata.Namespace, | ||
| PodName: item.Metadata.Name, | ||
| //ContainerID: cid, | ||
| ContainerName: status.Name, | ||
| }, nil | ||
| } | ||
| } | ||
| } | ||
| return nil, nil | ||
| } | ||
|
|
||
| // LookupContainerID looks up a process ID from the host PID namespace, | ||
| // returning its Docker and Containerd container ID. | ||
| func LookupContainerID(pid int) (string, error) { | ||
| f, err := os.Open(fmt.Sprintf("/proc/%d/cgroup", pid)) | ||
| if err != nil { | ||
| // this is normal, it just means the PID no longer exists | ||
| return "", nil | ||
| } | ||
| defer f.Close() | ||
|
|
||
| scanner := bufio.NewScanner(f) | ||
| for scanner.Scan() { | ||
| line := scanner.Text() | ||
| parts := kubePattern.FindStringSubmatch(line) | ||
| if parts != nil { | ||
| if len(parts) > 1 { | ||
| return parts[1], nil | ||
| } | ||
| } | ||
| } | ||
| return "", nil | ||
| } | ||
|
|
||
| var ( | ||
| kubePattern = regexp.MustCompile(`(?:docker-|cri-containerd-)?([a-f0-9]{64})\.scope`) | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| /* | ||
| Copyright (c) 2020 CyberArk Software Ltd. All rights reserved | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
| package pid2pod | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "fmt" | ||
| "github.com/jedib0t/go-pretty/table" | ||
| "github.com/jedib0t/go-pretty/text" | ||
| "github.com/mitchellh/go-ps" | ||
| "io" | ||
| "kubeletctl/cmd" | ||
| "kubeletctl/pkg/api" | ||
| "log" | ||
| "net/http/httputil" | ||
| "os" | ||
|
|
||
| "github.com/spf13/cobra" | ||
| ) | ||
|
|
||
| type podList struct { | ||
| // We only care about namespace, serviceAccountName and containerID | ||
| Metadata struct { | ||
| } `json:"metadata"` | ||
| Items []struct { | ||
| Metadata struct { | ||
| Namespace string `json:"namespace"` | ||
| Name string `json:"name"` | ||
| UID string `json:"uid"` | ||
| Labels map[string]string `json:"labels"` | ||
| } `json:"metadata"` | ||
| Spec struct { | ||
| ServiceAccountName string `json:"serviceAccountName"` | ||
| } `json:"spec"` | ||
| Status struct { | ||
| ContainerStatuses []struct { | ||
| ContainerID string `json:"containerID"` | ||
| Name string `json:"name"` | ||
| } `json:"containerStatuses"` | ||
| } `json:"status"` | ||
| } `json:"items"` | ||
| } | ||
|
|
||
| // pid2podCmd represents the pid2pod command | ||
| var pid2podCmd = &cobra.Command{ | ||
| Use: "pid2pod", | ||
| Short: "That shows how Linux process IDs (PIDs) can be mapped to Kubernetes pod metadata", | ||
| Long: `Description: | ||
| That shows how Linux process IDs (PIDs) can be mapped to Kubernetes pod metadata. | ||
| Example for usage: | ||
| kubeletctl pid2pod | ||
| `, | ||
| Run: func(cmd2 *cobra.Command, args []string) { | ||
| apiPathUrl := cmd.ServerFullAddressGlobal + api.PODS | ||
| resp, err := api.GetRequest(api.GlobalClient, apiPathUrl) | ||
| respDump, err := httputil.DumpResponse(resp, true) | ||
| if cmd.RawFlag { | ||
| fmt.Printf("RESPONSE:\n%s", string(respDump)) | ||
| } else { | ||
| if err != nil { | ||
| fmt.Printf("[*] Failed to run HTTP request with error: %s\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
|
||
| bodyBytes, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| resp.Body = io.NopCloser(bytes.NewBuffer(bodyBytes)) | ||
| var podInfo *podList | ||
| err = json.Unmarshal(bodyBytes, &podInfo) | ||
|
|
||
| if err != nil { | ||
| // TODO: this function does some of the previous checks, consider modification | ||
| cmd.PrintPrettyHttpResponse(resp, err) | ||
| } else { | ||
| tw := table.NewWriter() | ||
| tw.AppendHeader(table.Row{"PID", "POD", "NAMESPACE", "CONTAINERS"}) | ||
|
|
||
| // get system all processes | ||
| processes, err := ps.Processes() | ||
| if err != nil { | ||
| log.Fatalf("could not list processes: %v", err) | ||
| } | ||
| for _, proc := range processes { | ||
| if pidFlag != 0 { | ||
| if pidFlag == proc.Pid() { | ||
| pid = pidFlag | ||
| printPid2Pod(pid, proc.Executable(), podInfo, tw) | ||
| } | ||
| } else { | ||
| pid = proc.Pid() | ||
| printPid2Pod(pid, proc.Executable(), podInfo, tw) | ||
| } | ||
| } | ||
| tw.SetTitle("Pods from Pid") | ||
| tw.SetStyle(table.StyleLight) | ||
| tw.Style().Title.Align = text.AlignCenter | ||
| tw.SetAutoIndex(true) | ||
| tw.Style().Options.SeparateRows = true | ||
| if displayFlag == "table" { | ||
| fmt.Println(tw.Render()) | ||
| } | ||
| } | ||
| } | ||
| }, | ||
| } | ||
|
|
||
| func printPid2Pod(pid int, executable string, podInfo *podList, tw table.Writer) { | ||
| id, err := LookupPod(pid, executable, podInfo, tw) | ||
| if err != nil { | ||
| log.Fatalf("could not get ID of process %d: %v", pid, err) | ||
| } | ||
| if id != nil { | ||
| if displayFlag == "raw" { | ||
| fmt.Printf("PID %d (%s): %+#v\n", pid, executable, id) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| var ( | ||
| pidFlag int | ||
| pid int | ||
| displayFlag string | ||
| ) | ||
|
|
||
| func init() { | ||
| cmd.RootCmd.AddCommand(pid2podCmd) | ||
| pid2podCmd.PersistentFlags().IntVarP(&pidFlag, "pid", "", 0, "Name of pid to look.") | ||
| pid2podCmd.PersistentFlags().StringVarP(&displayFlag, "display", "", "table", "Data display mode, [raw、table].") | ||
| } |
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