diff --git a/.gitignore b/.gitignore index 6f72f89..505e5f6 100644 --- a/.gitignore +++ b/.gitignore @@ -23,3 +23,6 @@ go.work.sum # env file .env + +# local folder +local diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..188a555 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,23 @@ +# Build stage +FROM golang:1.24-alpine AS builder + +WORKDIR /app + +COPY go.mod go.sum ./ + +RUN go mod download + +COPY *.go ./ + +RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o file-monitor-controller . + +# Final stage +FROM alpine:latest + +RUN apk --no-cache add ca-certificates + +WORKDIR /root/ + +COPY --from=builder /app/file-monitor-controller . + +CMD ["./file-monitor-controller"] diff --git a/README.md b/README.md index 3d9af25..22de5ca 100644 --- a/README.md +++ b/README.md @@ -1 +1,130 @@ -# file-monitor-kube-controller \ No newline at end of file +# file-monitor-kube-controller + +A Kubernetes controller that monitors file system changes and updates Custom Resource Definitions (CRDs) with file information such as inode, file name, size, and modification time. + +## Features + +- Queries Kubernetes CRDs using the k8s.io/client-go library +- Monitors file system changes in specified paths +- Updates CRD status with file information (inode, name, size, modification time) +- Supports both in-cluster and out-of-cluster configurations +- Namespace-aware file monitoring + +## Prerequisites + +- Go 1.24 or later +- Kubernetes cluster (for deployment) +- kubectl configured to access your cluster + +## Installation + +1. **Install the CRD:** + ```bash + kubectl apply -f filemonitor-crd.yaml + ``` + +2. **Deploy the controller:** + ```bash + kubectl apply -f deployment.yaml + ``` + +3. **Create a FileMonitor resource:** + ```bash + kubectl apply -f example-filemonitor.yaml + ``` + +## Usage + +### Running locally (development) + +1. **Build the application:** + ```bash + go build -o file-monitor-controller + ``` + +2. **Run the controller:** + ```bash + ./file-monitor-controller + ``` + +### Running in Kubernetes + +1. **Build and push Docker image:** + ```bash + docker build -t your-registry/file-monitor-controller:latest . + docker push your-registry/file-monitor-controller:latest + ``` + +2. **Update the deployment image:** + ```bash + # Edit deployment.yaml to use your image + kubectl apply -f deployment.yaml + ``` + +## CRD Structure + +The FileMonitor CRD has the following structure: + +```yaml +apiVersion: sentinalfs.io/v1 +kind: FileMonitor +metadata: + name: example-file-monitor + namespace: default +spec: + path: "/tmp" # Path to monitor + namespace: "default" # Target namespace +status: + files: # Updated by controller + - name: "example.txt" + inode: 12345 + size: 1024 + modTime: "2025-01-13T10:00:00Z" + path: "/tmp/example.txt" + isDir: false +``` + +## Controller Functionality + +The controller performs the following operations in a continuous loop: + +1. **Query CRDs:** Lists all FileMonitor resources across namespaces +2. **Namespace-specific queries:** Queries CRDs in specific namespaces +3. **File information updates:** Updates CRD status with current file information +4. **Error handling:** Gracefully handles missing CRDs and API errors + +## Key Functions + +- `queryCRDs()`: Queries all CRDs across all namespaces +- `queryCRDsInNamespace()`: Queries CRDs in a specific namespace +- `updateCRDWithFileInfo()`: Updates CRD status with file information +- `initKubernetesClients()`: Initializes both regular and dynamic K8s clients + +## Configuration + +The controller automatically detects the runtime environment: +- **In-cluster:** Uses service account credentials +- **Local development:** Uses kubeconfig from `~/.kube/config` + +## RBAC Permissions + +The controller requires the following permissions: +- Get, list, watch, create, update, patch, delete on `filemonitors` resources +- Get, update, patch on `filemonitors/status` +- Create, patch on `events` for logging + +## Monitoring + +The controller logs its operations including: +- CRD discovery and enumeration +- File system monitoring events +- Error conditions and retries +- Status updates + +## Contributing + +1. Fork the repository +2. Create a feature branch +3. Make your changes +4. Test thoroughly +5. Submit a pull request \ No newline at end of file diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..4a8997e --- /dev/null +++ b/go.mod @@ -0,0 +1,49 @@ +module fileMonitorKubeController + +go 1.24.5 + +require ( + k8s.io/apimachinery v0.33.2 + k8s.io/client-go v0.33.2 +) + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/fxamacker/cbor/v2 v2.7.0 // indirect + github.com/go-logr/logr v1.4.2 // indirect + github.com/go-openapi/jsonpointer v0.21.0 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.23.0 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/google/gnostic-models v0.6.9 // indirect + github.com/google/go-cmp v0.7.0 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/x448/float16 v0.8.4 // indirect + golang.org/x/net v0.38.0 // indirect + golang.org/x/oauth2 v0.27.0 // indirect + golang.org/x/sys v0.31.0 // indirect + golang.org/x/term v0.30.0 // indirect + golang.org/x/text v0.23.0 // indirect + golang.org/x/time v0.9.0 // indirect + google.golang.org/protobuf v1.36.5 // indirect + gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/api v0.33.2 // indirect + k8s.io/klog/v2 v2.130.1 // indirect + k8s.io/kube-openapi v0.0.0-20250318190949-c8a335a9a2ff // indirect + k8s.io/utils v0.0.0-20241104100929-3ea5e8cea738 // indirect + sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3 // indirect + sigs.k8s.io/randfill v1.0.0 // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.6.0 // indirect + sigs.k8s.io/yaml v1.4.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..99031e4 --- /dev/null +++ b/go.sum @@ -0,0 +1,153 @@ +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/emicklei/go-restful/v3 v3.11.0 h1:rAQeMHw1c7zTmncogyy8VvRZwtkmkZ4FxERmMY4rD+g= +github.com/emicklei/go-restful/v3 v3.11.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= +github.com/fxamacker/cbor/v2 v2.7.0 h1:iM5WgngdRBanHcxugY4JySA0nk1wZorNOpTgCMedv5E= +github.com/fxamacker/cbor/v2 v2.7.0/go.mod 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h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU= +sigs.k8s.io/randfill v1.0.0/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY= +sigs.k8s.io/structured-merge-diff/v4 v4.6.0 h1:IUA9nvMmnKWcj5jl84xn+T5MnlZKThmUW1TdblaLVAc= +sigs.k8s.io/structured-merge-diff/v4 v4.6.0/go.mod h1:dDy58f92j70zLsuZVuUX5Wp9vtxXpaZnkPGWeqDfCps= +sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E= +sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY= diff --git a/kubernetes/client.go b/kubernetes/client.go new file mode 100644 index 0000000..0c172ce --- /dev/null +++ b/kubernetes/client.go @@ -0,0 +1,35 @@ +package kubernetes + +import ( + "fmt" + + "k8s.io/client-go/dynamic" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/rest" + "k8s.io/client-go/tools/clientcmd" +) + +func InitKubernetesClients() (kubernetes.Interface, dynamic.Interface, error) { + var config *rest.Config + var err error + + config, err = rest.InClusterConfig() + if err != nil { + config, err = clientcmd.BuildConfigFromFlags("", clientcmd.RecommendedHomeFile) + if err != nil { + return nil, nil, fmt.Errorf("failed to build config: %v", err) + } + } + + clientset, err := kubernetes.NewForConfig(config) + if err != nil { + return nil, nil, fmt.Errorf("failed to create clientset: %v", err) + } + + dynamicClient, err := dynamic.NewForConfig(config) + if err != nil { + return nil, nil, fmt.Errorf("failed to create dynamic client: %v", err) + } + + return clientset, dynamicClient, nil +} \ No newline at end of file diff --git a/kubernetes/crds.go b/kubernetes/crds.go new file mode 100644 index 0000000..8271717 --- /dev/null +++ b/kubernetes/crds.go @@ -0,0 +1,82 @@ +package kubernetes + +import ( + "context" + "fmt" + "log" + + "k8s.io/apimachinery/pkg/api/errors" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" + "k8s.io/apimachinery/pkg/runtime/schema" + "k8s.io/client-go/dynamic" +) + + +func QueryCRDsInNamespace(ctx context.Context, client dynamic.Interface, gvr schema.GroupVersionResource, namespace string) error { + log.Printf("Querying CRDs in namespace: %s", namespace) + + list, err := client.Resource(gvr).Namespace(namespace).List(ctx, metav1.ListOptions{}) + if err != nil { + if errors.IsNotFound(err) { + log.Printf("No CRDs found in namespace %s", namespace) + return nil + } + return fmt.Errorf("failed to list CRDs in namespace %s: %v", namespace, err) + } + + log.Printf("Found %d CRDs in namespace: %s", len(list.Items), namespace) + + for _, item := range list.Items { + name := item.GetName() + log.Printf("CRD: %s", name) + } + + return nil +} + + + +func UpdateCRDWithFileInfo(ctx context.Context, client dynamic.Interface, gvr schema.GroupVersionResource, namespace string) error { + log.Printf("Updating CRDs with file information in namespace: %s", namespace) + + // Get existing CRDs + list, err := client.Resource(gvr).Namespace(namespace).List(ctx, metav1.ListOptions{}) + if err != nil { + if errors.IsNotFound(err) { + log.Printf("No CRDs found to update in namespace %s", namespace) + return nil + } + return fmt.Errorf("failed to list CRDs for update: %v", err) + } + + for _, item := range list.Items { + name := item.GetName() + log.Printf("Updating CRD: %s", name) + + fileInfo := []interface{}{ + map[string]interface{}{ + "inode": 12345, + "cGroupId": "12232", + "path": "/tmp/example.txt", + }, + } + + // Update the status with file information + if err := unstructured.SetNestedSlice(item.Object, fileInfo, "status", "files"); err != nil { + log.Printf("Failed to set file info for CRD %s: %v", name, err) + continue + } + + // Update the CRD + _, err := client.Resource(gvr).Namespace(namespace).UpdateStatus(ctx, &item, metav1.UpdateOptions{}) + if err != nil { + log.Printf("Failed to update CRD %s: %v", name, err) + continue + } + + log.Printf("Successfully updated CRD: %s", name) + } + + return nil +} \ No newline at end of file diff --git a/main.go b/main.go new file mode 100644 index 0000000..d324fd3 --- /dev/null +++ b/main.go @@ -0,0 +1,34 @@ +package main + +import ( + "context" + k8s "fileMonitorKubeController/kubernetes" + models "fileMonitorKubeController/models" + "log" + "os" + "time" +) + + + +func main() { + _, dynamicClient, err := k8s.InitKubernetesClients() + if err != nil { + log.Fatalf("Failed to initialize Kubernetes clients: %v", err) + } + + crdGVR := models.QueryCRD + + ctx := context.Background() + + for { + log.Println("Querying CRDs...") + + namespace := os.Getenv("NAMESPACE") + if err := k8s.QueryCRDsInNamespace(ctx, dynamicClient, crdGVR, namespace); err != nil { + log.Printf("Error querying CRDs in namespace %s: %v", namespace, err) + } + + time.Sleep(30 * time.Second) + } +} diff --git a/models/file.go b/models/file.go new file mode 100644 index 0000000..548b94b --- /dev/null +++ b/models/file.go @@ -0,0 +1,30 @@ +package models + +type FileInfo struct { + Path string `json:"path"` + CGroupID string `json:"cGroupID"` + Inode uint64 `json:"inode"` +} + +type PodSelector struct { + Labels map[string]string `json:"labels"` +} + +type Dir struct { + Path string `json:"path"` + Depth int `json:"depth"` +} + +type FileMonitorCRD struct { + APIVersion string `json:"apiVersion"` + Kind string `json:"kind"` + Metadata struct { + Name string `json:"name"` + Namespace string `json:"namespace"` + } `json:"metadata"` + Spec struct { + PodSelector PodSelector `json:"podSelector"` + Dirs []Dir `json:"dirs"` + Files []FileInfo `json:"files"` + } `json:"spec"` +} \ No newline at end of file diff --git a/models/gvr.go b/models/gvr.go new file mode 100644 index 0000000..8093daf --- /dev/null +++ b/models/gvr.go @@ -0,0 +1,13 @@ +package models + +import ( + "k8s.io/apimachinery/pkg/runtime/schema" +) + +var ( + QueryCRD = schema.GroupVersionResource{ + Group: "sentinelfs.io", + Version: "v2", + Resource: "filemonitors", + } +)