틀린 문제 #4 Static Pod

문제 1

Create a static pod named static-busybox that uses the busybox image , run in the default namespace and the command sleep 1000

---

# --dry-run=client -o yaml 명령어로 static-busybox.yaml 파일 생성

kubectl run static-busybox --image=busybox --dry-run=client -o yaml --command -- sleep 1000 > static-busybox.yaml

 

# static pods 생성을 위해 static-busybox.yaml 파일을 /etc/kubernetes/manifests로 이동

cp static-busybox.yaml /etc/kubernetes/manifests/

 

# 생성 확인

kubectl get pods
NAME                          READY   STATUS    RESTARTS   AGE
static-busybox-controlplane   1/1     Running   0          5s

 

문제 2

Edit the image on the static pod you created in the previous task to use busybox:1.28.4

---

# edit 명령어로 기존 pod 수정

kubectl edit pods static-busybox-controlplane
pod/static-busybox-controlplane edited

 

이미지만 1.28.4로 변경해준다.

 

문제 3

We just created a new static pod named static-greenbox. Find it and delete it.

 

This question is a bit tricky. But if you use the knowledge you gained in the previous questions in this lab, you should be able to find the answer to it.

---

# 현재 pod 확인

kubectl get pods -o wide
NAME                          READY   STATUS    RESTARTS   AGE     IP           NODE           NOMINATED NODE   READINESS GATES
static-busybox-controlplane   1/1     Running   0          10m     172.17.0.4   controlplane   <none>           <none>
static-greenbox-node01        1/1     Running   0          5m45s   172.17.1.2   node01         <none>           <none>

 

static-greenbox-node01 pod는 node 01에 위치한 것을 확인

 

# node01 IP 확인

kubectl get nodes -o wide
NAME           STATUS   ROLES           AGE   VERSION   INTERNAL-IP       EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION    CONTAINER-RUNTIME
controlplane   Ready    control-plane   31m   v1.34.0   192.168.243.140   <none>        Ubuntu 22.04.5 LTS   5.15.0-1083-gcp   containerd://1.6.26
node01         Ready    <none>          30m   v1.34.0   192.168.117.22    <none>        Ubuntu 22.04.5 LTS   5.15.0-1083-gcp   containerd://1.6.26

 

# node01 접속

ssh 192.168.117.22

 

# node01 내 static pod 경로 확인

node01 ~ ✖ cat /var/lib/kubelet/config.yaml
apiVersion: kubelet.config.k8s.io/v1beta1
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 0s
    enabled: true
  x509:
    clientCAFile: /etc/kubernetes/pki/ca.crt
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 0s
    cacheUnauthorizedTTL: 0s
cgroupDriver: cgroupfs
clusterDNS:
- 172.20.0.10
clusterDomain: cluster.local
containerRuntimeEndpoint: unix:///var/run/containerd/containerd.sock
cpuManagerReconcilePeriod: 0s
crashLoopBackOff: {}
evictionPressureTransitionPeriod: 0s
fileCheckFrequency: 0s
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 0s
imageMaximumGCAge: 0s
imageMinimumGCAge: 0s
kind: KubeletConfiguration
logging:
  flushFrequency: 0
  options:
    json:
      infoBufferSize: "0"
    text:
      infoBufferSize: "0"
  verbosity: 0
memorySwap: {}
nodeStatusReportFrequency: 0s
nodeStatusUpdateFrequency: 0s
rotateCertificates: true
runtimeRequestTimeout: 0s
shutdownGracePeriod: 0s
shutdownGracePeriodCriticalPods: 0s
staticPodPath: /etc/just-to-mess-with-you
streamingConnectionIdleTimeout: 0s
syncFrequency: 0s
volumeStatsAggPeriod: 0s

 

/var/lib/kubelet/config.yaml 파일 내에서 staticPodPath를 확인해준다.

staticPodPath: /etc/just-to-mess-with-you 이다.

 

# 해당 경로에서 파일 삭제

node01 ~ ➜  cd /etc/just-to-mess-with-you
node01 /etc/just-to-mess-with-you ➜  ls
greenbox.yaml

node01 /etc/just-to-mess-with-you ✖ rm -f greenbox.yaml

 

# control plane으로 이동 후 pod 확인

node01 /etc/just-to-mess-with-you ➜  exit
logout
Connection to 192.168.117.22 closed.

controlplane ~ ✖ kubectl get pods
NAME                          READY   STATUS    RESTARTS   AGE
static-busybox-controlplane   1/1     Running   0          15m

 

pod가 삭제된 것을 확인 가능