Created
April 29, 2023 11:32
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script that calls containerd api and prints the labels
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| package main | |
| import ( | |
| "context" | |
| "fmt" | |
| "strings" | |
| "github.com/containerd/containerd" | |
| "github.com/containerd/containerd/namespaces" | |
| ) | |
| func getContainersPrometheusLabels(containerdSocket, namespace string) (map[string]map[string]string, error) { | |
| client, err := containerd.New(containerdSocket) | |
| if err != nil { | |
| return nil, fmt.Errorf("failed to connect to containerd: %v", err) | |
| } | |
| defer client.Close() | |
| ctx := namespaces.WithNamespace(context.Background(), namespace) | |
| containerService := client.ContainerService() | |
| containers, err := containerService.List(ctx) | |
| if err != nil { | |
| return nil, fmt.Errorf("failed to list containers: %v", err) | |
| } | |
| containerLabels := make(map[string]map[string]string) | |
| for _, container := range containers { | |
| containerID := container.ID | |
| labels := make(map[string]string) | |
| ids := make(map[string]string) | |
| ids["containerd_namespace"] = containerID | |
| ids["containerd_pod_sandbox_id"] = container.Labels["io.kubernetes.pod.uid"] | |
| containerName := container.Labels["io.kubernetes.container.name"] | |
| containerPrometheusLabelsFunc := func(labels, ids map[string]string, name string) map[string]string { | |
| labels["id"] = name | |
| labels["containerd_namespace"] = ids["containerd_namespace"] | |
| labels["containerd_pod_sandbox_id"] = ids["containerd_pod_sandbox_id"] | |
| labels["container_name"] = name | |
| for k, v := range container.Labels { | |
| labels[k] = v | |
| } | |
| return labels | |
| } | |
| containerLabels[containerID] = containerPrometheusLabelsFunc(labels, ids, containerName) | |
| // Print the labels for this container | |
| fmt.Printf("Labels for container %s:\n", containerID) | |
| for k, v := range container.Labels { | |
| fmt.Printf("%s=%s\n", k, v) | |
| } | |
| fmt.Println() | |
| } | |
| return containerLabels, nil | |
| } | |
| func main() { | |
| containerdSocket := "/run/containerd/containerd.sock" | |
| namespace := "k8s.io" | |
| containerLabels, err := getContainersPrometheusLabels(containerdSocket, namespace) | |
| if err != nil { | |
| fmt.Printf("Error fetching container labels: %v\n", err) | |
| return | |
| } | |
| fmt.Printf("Labels for containers in namespace %s:\n\n", namespace) | |
| fmt.Printf("%-70s %-25s %-40s %-25s\n", "Container ID", "Container Name", "Container Namespace", "Pod Sandbox ID") | |
| fmt.Println(strings.Repeat("-", 160)) | |
| for containerID, labels := range containerLabels { | |
| fmt.Printf("%-70s %-25s %-40s %-25s\n", | |
| containerID, | |
| labels["container_name"], | |
| labels["containerd_namespace"], | |
| labels["containerd_pod_sandbox_id"], | |
| ) | |
| } | |
| } |
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