k8s强制删除

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可使用kubectl中的强制删除命令

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# 删除POD
kubectl delete pod PODNAME --force --grace-period=0

# 删除NAMESPACE
kubectl delete namespace NAMESPACENAME --force --grace-period=0

有时候这种方法也删除不掉，可能是之前删除顺序有问题，没有删干净pod，就删除命名空间，导致删除不掉

直接从ETCD中删除源数据

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# 删除default namespace下的pod名为pod-to-be-deleted-0
ETCDCTL_API=3 etcdctl del /registry/pods/default/pod-to-be-deleted-0

# 删除需要删除的NAMESPACE
etcdctl del /registry/namespaces/NAMESPACENAME

添加别名

上面直接etcd删除，是证书直接能找到时候，如果证书配置方式不一样，就需要手动配一下！

配置别名etcdctl3，添加证书等参数

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alias etcdctl3='docker run --rm -it \
--net host -e ETCDCTL_API=3 \
-v /etc/kubernetes:/etc/kubernetes k8s.gcr.io/etcd:3.3.10 etcdctl \
--cert /etc/kubernetes/pki/etcd/peer.crt \
--key /etc/kubernetes/pki/etcd/peer.key \
--cacert /etc/kubernetes/pki/etcd/ca.crt \
--endpoints https://192.168.3.101:2379,https://192.168.3.102:2379,https://192.168.3.103:2379'

查询都有哪些daemonsets

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tcdctl3 get /registry/daemonsets/ --prefix --keys-only
/registry/daemonsets/default/testpod
/registry/daemonsets/kube-system/calico-node
/registry/daemonsets/kube-system/kube-proxy

与kubectl查看的结果一致

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kubectl get daemonsets --all-namespaces 
NAMESPACE     NAME          DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                 AGE
default       testpod       3         3         3       3            3           <none>                        91m
kube-system   calico-node   3         3         3       3            3           beta.kubernetes.io/os=linux   116m
kube-system   kube-proxy    3         3         3       3            3           <none>                        122m

在etcd中查询default namespace中的pod

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etcdctl3 get /registry/pods/default --prefix --keys-only 
/registry/pods/default/testpod-5wtb7
/registry/pods/default/testpod-646d8
/registry/pods/default/testpod-t7ps7

kubectl命令看到结果与etcd中一致

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kubectl get pods -l app=fortest
NAME            READY   STATUS    RESTARTS   AGE
testpod-5wtb7   1/1     Running   0          93m
testpod-646d8   1/1     Running   0          93m
testpod-t7ps7   1/1     Running   0          93m

在etcd中删除pod testpod-t7ps7

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etcdctl3 del /registry/pods/default/testpod-t7ps7    
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再次查看pod，发现testpod-t7ps7已经没有了

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kubectl get pods
NAME            READY   STATUS    RESTARTS   AGE
testpod-5wtb7   1/1     Running   0          96m
testpod-646d8   1/1     Running   0          96m
testpod-qczvt   1/1     Running   0          17s
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