Killer Shell CKA - Kube Controller Manager Misconfigured

1 개요

Killer Shell CKA - Kube Controller Manager Misconfigured

• https://killercoda.com/killer-shell-cka/scenario/kube-controller-manager-misconfigured
• Kube Controller Manager의 매니페스트 파일에서 잘못된 인수로 인해 컨테이너가 기동하지 않는 문제를 진단하고 해결하는 실습

2 최초 상태

controlplane:~$ k get pod -A
NAMESPACE            NAME                                      READY   STATUS             RESTARTS      AGE
kube-system          calico-kube-controllers-7bb4b4d4d-8q2r8   1/1     Running            2 (43m ago)   20d
kube-system          canal-rgkd5                               2/2     Running            2 (43m ago)   20d
kube-system          coredns-76bb9b6fb5-cz7dl                  1/1     Running            1 (43m ago)   20d
kube-system          coredns-76bb9b6fb5-zmkq2                  1/1     Running            1 (43m ago)   20d
kube-system          etcd-controlplane                         1/1     Running            1 (43m ago)   20d
kube-system          kube-apiserver-controlplane               1/1     Running            1 (43m ago)   20d
kube-system          kube-controller-manager-controlplane      0/1     CrashLoopBackOff   5 (27s ago)   3m37s
kube-system          kube-proxy-6rdfg                          1/1     Running            1 (43m ago)   20d
kube-system          kube-scheduler-controlplane               1/1     Running            1 (43m ago)   20d
local-path-storage   local-path-provisioner-76f88ddd78-hs6k4   1/1     Running            1 (43m ago)   20d

3 문제 진단

Kube Controller Manager의 로그를 확인하여 오류를 파악한다.

controlplane:~$ k -n kube-system logs kube-controller-manager-controlplane
...
Error: unknown flag: --project-sidecar-insertion

4 문제 해결

잘못된 인수를 제거하여 매니페스트 파일을 수정한다.

controlplane:~$ vim /etc/kubernetes/manifests/kube-controller-manager.yaml

- --project-sidecar-insertion=true # REMOVE

5 최종 확인

controlplane:~$ k get pod -A
NAMESPACE            NAME                                      READY   STATUS    RESTARTS      AGE
kube-system          calico-kube-controllers-7bb4b4d4d-8q2r8   1/1     Running   2 (45m ago)   20d
kube-system          canal-rgkd5                               2/2     Running   2 (45m ago)   20d
kube-system          coredns-76bb9b6fb5-cz7dl                  1/1     Running   1 (45m ago)   20d
kube-system          coredns-76bb9b6fb5-zmkq2                  1/1     Running   1 (45m ago)   20d
kube-system          etcd-controlplane                         1/1     Running   1 (45m ago)   20d
kube-system          kube-apiserver-controlplane               1/1     Running   1 (45m ago)   20d
kube-system          kube-controller-manager-controlplane      1/1     Running   0             38s
kube-system          kube-proxy-6rdfg                          1/1     Running   1 (45m ago)   20d
kube-system          kube-scheduler-controlplane               1/1     Running   1 (45m ago)   20d
local-path-storage   local-path-provisioner-76f88ddd78-hs6k4   1/1     Running   1 (45m ago)   20d

6 같이 보기

• Killer Shell CKA