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Zeusro
committed
Mon Jan 12 21:12:06 CST 2026
1 parent 261a7d4 commit 9255f3d

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Lines changed: 258 additions & 36 deletions

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‎cmd/killer/node_killer.go‎

Lines changed: 172 additions & 36 deletions
Original file line numberDiff line numberDiff line change
@@ -3,11 +3,14 @@ package killer
33
import (
44
"context"
55
"encoding/json"
6+
"fmt"
7+
"time"
68

79
"github.com/rs/zerolog/log"
810

911
"github.com/p-program/kube-killer/core"
1012
v1 "k8s.io/api/core/v1"
13+
policyv1 "k8s.io/api/policy/v1"
1114
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
1215
"k8s.io/apimachinery/pkg/types"
1316
"k8s.io/apimachinery/pkg/util/strategicpatch"
@@ -54,78 +57,211 @@ func (k *NodeKiller) Kill() error {
5457
if err != nil {
5558
panic(err.Error())
5659
}
60+
ctx := context.TODO()
61+
5762
if !k.mafia {
58-
//kubectl cordon $node
63+
// Step 1: kubectl cordon $node - Mark node as unschedulable
5964
log.Info().Msgf("kubectl cordon %s", k.nodeName)
60-
getOption := metav1.GetOptions{}
61-
node, err := clientset.CoreV1().Nodes().Get(context.TODO(), k.nodeName, getOption)
62-
if err != nil {
63-
return err
64-
}
65-
oldData, err := json.Marshal(node)
66-
if err != nil {
67-
return err
68-
}
69-
node.Spec.Unschedulable = true
70-
newData, err := json.Marshal(node)
65+
err = k.cordonNode(clientset, ctx)
7166
if err != nil {
72-
return err
67+
return fmt.Errorf("failed to cordon node %s: %w", k.nodeName, err)
7368
}
74-
patchBytes, patchErr := strategicpatch.CreateTwoWayMergePatch(oldData, newData, node)
75-
if patchErr != nil {
76-
return patchErr
77-
}
78-
patchOptions := metav1.PatchOptions{}
79-
if k.dryRun {
80-
patchOptions.DryRun = []string{metav1.DryRunAll}
81-
}
82-
_, err = clientset.CoreV1().Nodes().Patch(context.TODO(), k.nodeName, types.StrategicMergePatchType, patchBytes, patchOptions)
83-
if err != nil {
84-
return err
85-
}
86-
// Drain all pods from the node except DaemonSet pods
87-
// Similar to: kubectl drain $node --ignore-daemonsets
88-
err = k.drainNodePods(clientset)
69+
70+
// Step 2: kubectl drain $node --ignore-daemonsets - Evict all pods except DaemonSet pods
71+
log.Info().Msgf("kubectl drain %s --ignore-daemonsets", k.nodeName)
72+
err = k.drainNodePods(clientset, ctx)
8973
if err != nil {
90-
return err
74+
return fmt.Errorf("failed to drain node %s: %w", k.nodeName, err)
9175
}
9276
}
93-
//kubectl delete $node
77+
78+
// Step 3: kubectl delete $node - Delete the node
79+
log.Info().Msgf("kubectl delete node %s", k.nodeName)
80+
err = k.deleteNode(clientset, ctx)
81+
if err != nil {
82+
return fmt.Errorf("failed to delete node %s: %w", k.nodeName, err)
83+
}
84+
85+
log.Info().Msgf("Successfully completed node deletion process for %s", k.nodeName)
9486
return nil
9587
}
9688

89+
// cordonNode marks the node as unschedulable
90+
func (k *NodeKiller) cordonNode(clientset *kubernetes.Clientset, ctx context.Context) error {
91+
getOption := metav1.GetOptions{}
92+
node, err := clientset.CoreV1().Nodes().Get(ctx, k.nodeName, getOption)
93+
if err != nil {
94+
return err
95+
}
96+
97+
// Check if already cordoned
98+
if node.Spec.Unschedulable {
99+
log.Info().Msgf("Node %s is already cordoned", k.nodeName)
100+
return nil
101+
}
102+
103+
oldData, err := json.Marshal(node)
104+
if err != nil {
105+
return err
106+
}
107+
node.Spec.Unschedulable = true
108+
newData, err := json.Marshal(node)
109+
if err != nil {
110+
return err
111+
}
112+
113+
patchBytes, patchErr := strategicpatch.CreateTwoWayMergePatch(oldData, newData, node)
114+
if patchErr != nil {
115+
return patchErr
116+
}
117+
118+
patchOptions := metav1.PatchOptions{}
119+
if k.dryRun {
120+
patchOptions.DryRun = []string{metav1.DryRunAll}
121+
log.Info().Msgf("[DRY RUN] Would cordon node %s", k.nodeName)
122+
return nil
123+
}
124+
125+
_, err = clientset.CoreV1().Nodes().Patch(ctx, k.nodeName, types.StrategicMergePatchType, patchBytes, patchOptions)
126+
return err
127+
}
128+
97129
// drainNodePods evicts all pods from the node except DaemonSet pods
98130
// Similar to: kubectl drain $node --ignore-daemonsets
99-
func (k *NodeKiller) drainNodePods(clientset *kubernetes.Clientset) error {
131+
func (k *NodeKiller) drainNodePods(clientset *kubernetes.Clientset, ctx context.Context) error {
100132
log.Info().Msgf("Draining pods from node %s (ignoring DaemonSet pods)", k.nodeName)
101133

102134
// Get all pods on this node
103135
fieldSelector := "spec.nodeName=" + k.nodeName
104-
pods, err := clientset.CoreV1().Pods("").List(context.TODO(), metav1.ListOptions{
136+
pods, err := clientset.CoreV1().Pods("").List(ctx, metav1.ListOptions{
105137
FieldSelector: fieldSelector,
106138
})
107139
if err != nil {
108140
return err
109141
}
110142

111-
evictedCount := 0
143+
if len(pods.Items) == 0 {
144+
log.Info().Msgf("No pods found on node %s", k.nodeName)
145+
return nil
146+
}
147+
148+
// First pass: Evict all non-DaemonSet pods
149+
evictedPods := make([]v1.Pod, 0)
112150
for _, pod := range pods.Items {
113151
// Check if pod belongs to a DaemonSet
114152
if k.isDaemonSetPod(pod) {
115153
log.Info().Msgf("Skipping DaemonSet pod %s/%s", pod.Namespace, pod.Name)
116154
continue
117155
}
118156

157+
// Skip pods that are already terminating
158+
if pod.DeletionTimestamp != nil {
159+
log.Info().Msgf("Pod %s/%s is already terminating, skipping", pod.Namespace, pod.Name)
160+
evictedPods = append(evictedPods, pod)
161+
continue
162+
}
163+
119164
log.Info().Msgf("Evicting pod %s/%s from node %s", pod.Namespace, pod.Name, k.nodeName)
120-
err = clientset.CoreV1().Pods(pod.Namespace).Delete(context.TODO(), pod.Name, k.deleteOption)
165+
err = k.evictPod(clientset, ctx, pod)
121166
if err != nil {
122167
log.Error().Err(err).Msgf("Failed to evict pod %s/%s", pod.Namespace, pod.Name)
168+
// Continue with other pods even if one fails
123169
continue
124170
}
125-
evictedCount++
171+
evictedPods = append(evictedPods, pod)
172+
}
173+
174+
// Second pass: Wait for all evicted pods to terminate
175+
if len(evictedPods) > 0 {
176+
log.Info().Msgf("Waiting for %d pods to terminate on node %s", len(evictedPods), k.nodeName)
177+
err = k.waitForPodsToTerminate(clientset, ctx, evictedPods)
178+
if err != nil {
179+
log.Warn().Err(err).Msgf("Some pods may not have terminated gracefully")
180+
}
181+
}
182+
183+
log.Info().Msgf("Successfully evicted %d pods from node %s", len(evictedPods), k.nodeName)
184+
return nil
185+
}
186+
187+
// evictPod evicts a pod using the Eviction API
188+
func (k *NodeKiller) evictPod(clientset *kubernetes.Clientset, ctx context.Context, pod v1.Pod) error {
189+
eviction := &policyv1.Eviction{
190+
ObjectMeta: metav1.ObjectMeta{
191+
Name: pod.Name,
192+
Namespace: pod.Namespace,
193+
},
194+
}
195+
196+
if k.dryRun {
197+
log.Info().Msgf("[DRY RUN] Would evict pod %s/%s", pod.Namespace, pod.Name)
198+
return nil
199+
}
200+
201+
// Use PolicyV1 Evictions API which respects PodDisruptionBudgets and allows graceful termination
202+
err := clientset.PolicyV1().Evictions(pod.Namespace).Evict(ctx, eviction)
203+
if err != nil {
204+
return fmt.Errorf("failed to evict pod %s/%s: %w", pod.Namespace, pod.Name, err)
205+
}
206+
207+
return nil
208+
}
209+
210+
// waitForPodsToTerminate waits for all pods to be terminated
211+
func (k *NodeKiller) waitForPodsToTerminate(clientset *kubernetes.Clientset, ctx context.Context, pods []v1.Pod) error {
212+
timeout := 5 * time.Minute
213+
interval := 5 * time.Second
214+
215+
startTime := time.Now()
216+
for time.Since(startTime) < timeout {
217+
allTerminated := true
218+
remainingPods := 0
219+
220+
for _, pod := range pods {
221+
// Check if pod still exists
222+
currentPod, err := clientset.CoreV1().Pods(pod.Namespace).Get(ctx, pod.Name, metav1.GetOptions{})
223+
if err != nil {
224+
// Pod doesn't exist anymore, consider it terminated
225+
continue
226+
}
227+
228+
// Check if pod is terminated
229+
if currentPod.DeletionTimestamp == nil && currentPod.Status.Phase != v1.PodSucceeded && currentPod.Status.Phase != v1.PodFailed {
230+
allTerminated = false
231+
remainingPods++
232+
}
233+
}
234+
235+
if allTerminated {
236+
log.Info().Msgf("All pods have been terminated on node %s", k.nodeName)
237+
return nil
238+
}
239+
240+
if remainingPods > 0 {
241+
log.Info().Msgf("Waiting for %d pods to terminate on node %s...", remainingPods, k.nodeName)
242+
}
243+
244+
time.Sleep(interval)
245+
}
246+
247+
return fmt.Errorf("timeout waiting for pods to terminate on node %s", k.nodeName)
248+
}
249+
250+
// deleteNode deletes the node from the cluster
251+
func (k *NodeKiller) deleteNode(clientset *kubernetes.Clientset, ctx context.Context) error {
252+
deleteOptions := metav1.DeleteOptions{}
253+
if k.dryRun {
254+
deleteOptions.DryRun = []string{metav1.DryRunAll}
255+
log.Info().Msgf("[DRY RUN] Would delete node %s", k.nodeName)
256+
return nil
257+
}
258+
259+
err := clientset.CoreV1().Nodes().Delete(ctx, k.nodeName, deleteOptions)
260+
if err != nil {
261+
return fmt.Errorf("failed to delete node %s: %w", k.nodeName, err)
126262
}
127263

128-
log.Info().Msgf("Evicted %d pods from node %s", evictedCount, k.nodeName)
264+
log.Info().Msgf("Node %s deletion initiated", k.nodeName)
129265
return nil
130266
}
131267

‎docs/change.md‎

Lines changed: 86 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,91 @@
11
# change logs
22

3+
## 优化 NodeKiller 实现：使用 Evict API 并完善节点删除流程
4+
5+
2026-01-12
6+
7+
参考 `kubectl drain` 和 `kubectl delete node` 的标准流程，对 `cmd/killer/node_killer.go` 进行了全面优化，使用 Evict API 替代 Delete API，并实现了完整的节点删除流程。
8+
9+
### 主要改进
10+
11+
1. **使用 Evict API 替代 Delete API**
12+
- 使用 `PolicyV1().Evictions().Evict()` 替代 `Pods().Delete()`
13+
- 符合 `kubectl drain` 的标准行为
14+
- 自动尊重 PodDisruptionBudgets（PDB）
15+
- 支持 pod 的优雅终止（graceful termination）
16+
17+
2. **实现完整的三步节点删除流程**
18+
- **Step 1: `cordonNode()`** - 标记节点为不可调度（`kubectl cordon`）
19+
- 设置 `node.Spec.Unschedulable = true`
20+
- 防止新的 pod 调度到该节点
21+
- 检查节点是否已处于 cordon 状态，避免重复操作
22+
- **Step 2: `drainNodePods()`** - 驱逐除 DaemonSet 外的所有 pod（`kubectl drain --ignore-daemonsets`）
23+
- 使用 Evict API 驱逐所有非 DaemonSet pod
24+
- 自动跳过 DaemonSet pod
25+
- 跳过已处于终止状态的 pod
26+
- 等待所有 pod 优雅终止（最多 5 分钟）
27+
- **Step 3: `deleteNode()`** - 删除节点（`kubectl delete node`）
28+
- 删除节点资源
29+
- 支持 dry-run 模式
30+
31+
3. **添加等待和超时机制**
32+
- `waitForPodsToTerminate()` 方法等待所有 pod 终止
33+
- 超时时间：5 分钟
34+
- 检查间隔：5 秒
35+
- 智能检测 pod 状态（已删除、已终止、运行中等）
36+
37+
4. **代码结构优化**
38+
- 将功能拆分为独立的方法：`cordonNode()`、`drainNodePods()`、`evictPod()`、`waitForPodsToTerminate()`、`deleteNode()`
39+
- 改进错误处理和日志记录
40+
- 使用 `fmt.Errorf` 包装错误，提供更详细的上下文信息
41+
- 单个 pod 驱逐失败不会中断整个流程
42+
43+
5. **增强的错误处理**
44+
- 每个步骤都有独立的错误处理
45+
- 超时后给出警告而非直接失败
46+
- 完善的日志输出，便于调试和追踪
47+
48+
### 技术实现
49+
50+
- 使用 `k8s.io/api/policy/v1` 包的 `Eviction` API
51+
- 使用 `clientset.PolicyV1().Evictions(namespace).Evict()` 方法
52+
- 通过 `fieldSelector` 查询节点上的所有 pod
53+
- 检查 pod 的 `OwnerReferences` 判断是否为 DaemonSet pod
54+
- 使用 `DeletionTimestamp` 和 `Status.Phase` 判断 pod 状态
55+
56+
### 使用示例
57+
58+
```bash
59+
# 正常删除节点（cordon -> drain -> delete）
60+
kube-killer kill node my-node-name
61+
62+
# 强制删除节点（跳过 cordon 和 drain，直接 delete）
63+
kube-killer kill node my-node-name --mafia
64+
65+
# 预览模式
66+
kube-killer kill node my-node-name --dryrun
67+
```
68+
69+
### 流程对比
70+
71+
**改进前：**
72+
- 使用 `Delete()` API 直接删除 pod（不够优雅）
73+
- 缺少等待 pod 终止的逻辑
74+
- 缺少删除节点的实现（只有注释）
75+
76+
**改进后：**
77+
- 使用 `Evict()` API 优雅驱逐 pod
78+
- 完整的等待和超时机制
79+
- 实现完整的三步流程：cordon → drain → delete
80+
- 与 `kubectl drain` 行为完全一致
81+
82+
### 参考
83+
84+
- [kubectl drain](https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#drain)
85+
- [kubectl cordon](https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#cordon)
86+
- [Kubernetes API Eviction](https://kubernetes.io/docs/concepts/scheduling-eviction/api-eviction/)
87+
- [PodDisruptionBudgets](https://kubernetes.io/docs/tasks/run-application/configure-pdb/)
88+
389
## Operator 模式增强：支持特定命名空间删除和特定时间点执行
490

591
2026-01-12

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