calico-kube-controllers 启动失败处理

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文章描述了Calico-Kube-Controllers由于尝试写入/status/status.json文件时遇到权限问题导致不断重启。通过分析日志，发现问题在于无法写入该文件。解决方案是创建并修改目录权限，然后重新应用配置，最终成功恢复系统运行。

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故障描述

calico-kube-controllers 异常，不断重启

日志信息如下

2023-02-21 01:26:47.085 [INFO][1] main.go 92: Loaded configuration from environment config=&config.Config{LogLevel:"info", WorkloadEndpointWorkers:1, ProfileWorkers:1, PolicyWorkers:1, NodeWorkers:1, Kubeconfig:"", DatastoreType:"kubernetes"}
W0221 01:26:47.086980       1 client_config.go:615] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
2023-02-21 01:26:47.087 [INFO][1] main.go 113: Ensuring Calico datastore is initialized
2023-02-21 01:26:47.106 [INFO][1] main.go 153: Getting initial config snapshot from datastore
2023-02-21 01:26:47.120 [INFO][1] main.go 156: Got initial config snapshot
2023-02-21 01:26:47.120 [INFO][1] watchersyncer.go 89: Start called
2023-02-21 01:26:47.120 [INFO][1] main.go 173: Starting status report routine
2023-02-21 01:26:47.120 [INFO][1] main.go 182: Starting Prometheus metrics server on port 9094
2023-02-21 01:26:47.120 [INFO][1] main.go 418: Starting controller ControllerType="Node"
2023-02-21 01:26:47.120 [INFO][1] watchersyncer.go 127: Sending status update Status=wait-for-ready
2023-02-21 01:26:47.120 [INFO][1] node_syncer.go 65: Node controller syncer status updated: wait-for-ready
2023-02-21 01:26:47.120 [INFO][1] watchersyncer.go 147: Starting main event processing loop
2023-02-21 01:26:47.120 [INFO][1] watchercache.go 174: Full resync is required ListRoot="/calico/ipam/v2/assignment/"
2023-02-21 01:26:47.120 [INFO][1] node_controller.go 143: Starting Node controller
2023-02-21 01:26:47.121 [INFO][1] watchercache.go 174: Full resync is required ListRoot="/calico/resources/v3/projectcalico.org/nodes"
2023-02-21 01:26:47.121 [INFO][1] resources.go 349: Main client watcher loop
2023-02-21 01:26:47.121 [ERROR][1] status.go 138: Failed to write readiness file: open /status/status.json: permission denied
2023-02-21 01:26:47.121 [WARNING][1] status.go 66: Failed to write status error=open /status/status.json: permission denied
2023-02-21 01:26:47.121 [ERROR][1] status.go 138: Failed to write readiness file: open /status/status.json: permission denied
2023-02-21 01:26:47.121 [WARNING][1] status.go 66: Failed to write status error=open /status/status.json: permission denied
2023-02-21 01:26:47.124 [INFO][1] watchercache.go 271: Sending synced update ListRoot="/calico/ipam/v2/assignment/"
2023-02-21 01:26:47.125 [INFO][1] watchersyncer.go 127: Sending status update Status=resync
2023-02-21 01:26:47.125 [INFO][1] node_syncer.go 65: Node controller syncer status updated: resync
2023-02-21 01:26:47.125 [INFO][1] watchersyncer.go 209: Received InSync event from one of the watcher caches
2023-02-21 01:26:47.125 [ERROR][1] status.go 138: Failed to write readiness file: open /status/status.json: permission denied
2023-02-21 01:26:47.125 [WARNING][1] status.go 66: Failed to write status error=open /status/status.json: permission denied
2023-02-21 01:26:47.129 [INFO][1] watchercache.go 271: Sending synced update ListRoot="/calico/resources/v3/projectcalico.org/nodes"
2023-02-21 01:26:47.129 [ERROR][1] status.go 138: Failed to write readiness file: open /status/status.json: permission denied
2023-02-21 01:26:47.129 [WARNING][1] status.go 66: Failed to write status error=open /status/status.json: permission denied
2023-02-21 01:26:47.129 [INFO][1] watchersyncer.go 209: Received InSync event from one of the watcher caches
2023-02-21 01:26:47.129 [INFO][1] watchersyncer.go 221: All watchers have sync'd data - sending data and final sync
2023-02-21 01:26:47.129 [INFO][1] watchersyncer.go 127: Sending status update Status=in-sync
2023-02-21 01:26:47.129 [INFO][1] node_syncer.go 65: Node controller syncer status updated: in-sync
2023-02-21 01:26:47.137 [INFO][1] hostendpoints.go 90: successfully synced all hostendpoints
2023-02-21 01:26:47.221 [INFO][1] node_controller.go 159: Node controller is now running
2023-02-21 01:26:47.226 [INFO][1] ipam.go 69: Synchronizing IPAM data
2023-02-21 01:26:47.236 [INFO][1] ipam.go 78: Node and IPAM data is in sync

定位问题在这里

Failed to write status error=open /status/status.json: permission denied

进入容器检查目录

尝试进入容器，但是该容器居然没 cat , ls 等常规命令，无法查看容器问题

检查配置

查看pod的配置，对比其它集群，没任何问题，一样的

[grg@i-A8259010 ~]$ kubectl describe pod calico-kube-controllers-9f49b98f6-njs2f -n kube-system
Name:                 calico-kube-controllers-9f49b98f6-njs2f
Namespace:            kube-system
Priority:             2000000000
Priority Class Name:  system-cluster-critical
Node:                 10.254.39.2/10.254.39.2
Start Time:           Thu, 16 Feb 2023 11:14:35 +0800
Labels:               k8s-app=calico-kube-controllers
                      pod-template-hash=9f49b98f6
Annotations:          cni.projectcalico.org/podIP: 10.244.29.73/32
                      cni.projectcalico.org/podIPs: 10.244.29.73/32
Status:               Running
IP:                   10.244.29.73
IPs:
  IP:           10.244.29.73
Controlled By:  ReplicaSet/calico-kube-controllers-9f49b98f6
Containers:
  calico-kube-controllers:
    Container ID:   docker://21594e3517a3fc8ffc5224496cec373117138acf5417d9a335a1c5e80e0c3802
    Image:          registry.custom.local:12480/kubeadm-ha/calico_kube-controllers:v3.19.1
    Image ID:       docker-pullable://registry.cn-beijing.aliyuncs.com/dotbalo/kube-controllers@sha256:2ff71ba65cd7fe10e183ad80725ad3eafb59899d6f1b2610446b90c84bf2425a
    Port:           <none>
    Host Port:      <none>
    State:          Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       Error
      Exit Code:    2
      Started:      Tue, 21 Feb 2023 09:34:06 +0800
      Finished:     Tue, 21 Feb 2023 09:35:15 +0800
    Ready:          False
    Restart Count:  1940
    Liveness:       exec [/usr/bin/check-status -l] delay=10s timeout=1s period=10s #success=1 #failure=6
    Readiness:      exec [/usr/bin/check-status -r] delay=0s timeout=1s period=10s #success=1 #failure=3
    Environment:
      ENABLED_CONTROLLERS:  node
      DATASTORE_TYPE:       kubernetes
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-55jbn (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             False
  ContainersReady   False
  PodScheduled      True
Volumes:
  kube-api-access-55jbn:
    Type:                    Projected (a volume that contains injected data from multiple sources)
    TokenExpirationSeconds:  3607
    ConfigMapName:           kube-root-ca.crt
    ConfigMapOptional:       <nil>
    DownwardAPI:             true
QoS Class:                   BestEffort
Node-Selectors:              kubernetes.io/os=linux
Tolerations:                 CriticalAddonsOnly op=Exists
                             node-role.kubernetes.io/master:NoSchedule
                             node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                             node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type     Reason     Age                        From     Message
  ----     ------     ----                       ----     -------
  Warning  Unhealthy  31m (x15164 over 4d22h)    kubelet  Readiness probe failed: Failed to read status file /status/status.json: unexpected end of JSON input
  Warning  BackOff    6m23s (x23547 over 4d22h)  kubelet  Back-off restarting failed container
  Warning  Unhealthy  79s (x11571 over 4d22h)    kubelet  Liveness probe failed: Failed to read status file /status/status.json: unexpected end of JSON input

对比镜像

检查镜像版本，与其它集群一致，没问题

Image:          registry.custom.local:12480/kubeadm-ha/calico_kube-controllers:v3.19.1    
Image ID:       docker-pullable://registry.cn-beijing.aliyuncs.com/dotbalo/kube-controllers@sha256:2ff71ba65cd7fe10e183ad80725ad3eafb59899d6f1b2610446b90c84bf2425a

检查其余集群配置差异

检查与其它集群的配置信息，该机器的 docker 是原来已经安装的，版本是 19，其它机器是新安装的版本 20 。

处理方案

在无法重装 docker 的情况下

重启 pod，无效

百度，无相关信息

调整 calico-kube-controllers 配置

配置文件在 /etc/kubernetes/plugins/network-plugin/calico-typha.yaml

我们针对无法写入目录 /status ，添加卷映射

应用配置

mkdir /var/run/calico/status
chmod 777/var/run/calico/status
kubectl apply -f  /etc/kubernetes/plugins/network-plugin/calico-typha.yaml

到此系统恢复