DOIK] AWS EC2에 Vanilla Kubernetes 실습 환경 배포

2022-05-27

이번에 Database Operator In Kubernetes (DOIK) 스터디에 참여하게 되었다.
스터디에서 notion과 slack으로 관련 자료를 공유해 주시는데 좋은 자료가 많아서 행복하다,,😚

이번에 새롭게 알게 된 사실은 차별 IT용어가 있어서 지양하는 단어가 몇 있다는 것이다.
그 중 하나는 Master Node인데, 차별 IT 용어로 master slave를 비권장하므로 Master Node 대신 Control Plane 사용을 권장한다고 한다.
그래서 나도 이제부터 Control Plane이라고 칭할 것 이다!

이번 포스팅에서는 스터디에서 제공해 준 CloudFormation 템플릿으로 EC2에 Vanilla Kubernetes를 설치한 과정을 보여줄 것이다.
** Vanilla란, 프로그램에 아무것도 추가하지 않은 순정 상태의 소프트웨어를 가리키는 속어다.

0. 전체 구성도

전체구성도

Kubernetes 버전 v1.23.6 , Calico CNI(CrossSubnet 모드, ENI S/D Uncheck) , CRI(Docker), StorageClass(local-path, hostpath)
EC2 Spec : Ubuntu 22.04, t3.medium, EBS gp3 40GiB
네트워크 대역 : Public Subnet 2개, Private Subnet 2개
Control Plane 1대, Worker Node 3대 구성

Hostname	IPv4
k8s-m	192.168.10.10
k8s-w1	192.168.10.101
k8s-w2	192.168.10.102
k8s-w3	192.168.20.103

1. Cloudfarmation으로 자동 배포

0단계 : EC2 접속에 사용하는 SSH Key 생성

참고 ) 1단계: EC2 SSH 키 페어 생성

AWS Management Console에서 AWS 리전 선택 : ap-northeast-2 (서울)
서비스 > EC2 > 네트워크 및 보안 > 키 페어 > 키 페어 생성
이름 : doik-ec2-access-key-ap-northeast-2 / 키 페어 유형 : RSA (공개키) / 프라이빗 키 파일 형식 : .pem (OpenSSH와 함께 사용) > 키 페어 생성

1단계 : 템플릿 지정

스터디에서 제공해 준 템플릿
Amazon S3 URL

2단계 : 스택 세부 정보 지정

스택 이름 : myk8s (기본)
파라미터 :
- ««< EC2 Node »»>
  - KeyName : 0단계에서 생성한 KeetPair 선택
  - SgIngressCidr : EC2 인스턴스를 접속할 수 있는 IP 주소 입력 (나의 public IP/32)

3단계 : 스택 옵션 구성

패스

4단계 : 검토

내용 확인 > 스택 생성
인스턴스 생성 확인

2. Cluster 생성 및 Component 설치

(1) 설치 후, 기본 setup

Control Plane 접속

EC2에서 생성한 Private Key로 ssh 접속

  gain@LAPTOP-NGE5O25S:/mnt/c/Users/User/Downloads$ ssh -i ./myk8s.pem ubuntu@13.125.127.182
  	Welcome to Ubuntu 22.04 LTS (GNU/Linux 5.15.0-1005-aws x86_64)
        	
  	 * Documentation:  https://help.ubuntu.com
  	 * Management:     https://landscape.canonical.com
  	 * Support:        https://ubuntu.com/advantage
        	
  	  System information as of Fri May 27 18:20:23 KST 2022        
        	
  	  System load:  0.3359375         Processes:                143  Usage of /:   9.0% of 38.60GB   Users logged in:          0  
  	  Memory usage: 21%               IPv4 address for docker0: 172.17.0.1
  	  Swap usage:   0%                IPv4 address for ens5:    192.168.10.10
        	
        	
  	27 updates can be applied immediately.
  	21 of these updates are standard security updates.
  	                                                      able     
  	Last login: Fri May 27 16:07:30 2022 from 125.178.215.17
  (🐤 |kubernetes-admin@kubernetes:default) root@k8s-m:~#

처음에는 접속 오류를 겪었다.. 아래 포스팅 참고

[AWS] EC2 SSH 접속 에러

Control Plane 설정 로그 확인

 (🍎 |kubernetes-admin@kubernetes:default) root@k8s-m:~# sudo tail -f /var/log/cloud-init-output.log
 	No services need to be restarted.
    	
 	No containers need to be restarted.
    	
 	No user sessions are running outdated binaries.
    	
 	No VM guests are running outdated hypervisor (qemu) binaries on this host.
 	/nfs4-share     <world>(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)
 	>>>> K8S Controlplane Config End <<<<
 	Cloud-init v. 22.1-14-g2e17a0d6-0ubuntu1~22.04.5 finished at Sun, 22 May 2022 12:24:19 +0000. Datasource DataSourceEc2Local.  Up 181.88 seconds

CNI/StorageClass 등 설치 스크립트 실행

Control Plane SSH 종료 후 다시 SSH 접속

 (🍎 |kubernetes-admin@kubernetes:default) root@k8s-m:~# exa -bghHliSR DOIK/
 	 inode Permissions Links Size Blocks User Group Date Modified Name
 	516217 drwxr-xr-x      2    -      - root root  22 May 21:23  1
 	516239 .rw-r--r--      1   55      8 root root  22 May 21:23  README.md
    	
 	DOIK/1:
 	 inode Permissions Links  Size Blocks User Group Date Modified Name
 	516232 .rw-r--r--      1   782      8 root root  22 May 21:23  1-3pods.yaml
 	516233 .rw-r--r--      1 213Ki    432 root root  22 May 21:23  calico-crosssubnet-v3.22.2.yaml
 	516234 .rwx------      1 1.2Ki      8 root root  22 May 21:23  final.sh
 	516235 .rwx------      1 2.3Ki      8 root root  22 May 21:23  init.sh
 	516236 .rwx------      1 1.9Ki      8 root root  22 May 21:23  master.sh
 	516237 .rw-r--r--      1 4.1Ki     16 root root  22 May 21:23  metrics-server.yaml
 	516238 .rwx------      1   971      8 root root  22 May 21:23  worker.sh
 (🍎 |kubernetes-admin@kubernetes:default) root@k8s-m:~# cd /root/DOIK/1 && ./final.sh && cd $HOME
 	+ echo '[TASK 10] Install Calico CNI'
 	[TASK 10] Install Calico CNI
 	+ kubectl apply -f https://raw.githubusercontent.com/gasida/DOIK/main/1/calico-crosssubnet-v3.22.2.yaml
 	//...중략...
 	NAME: nfs-provisioner
 	LAST DEPLOYED: Mon May 23 01:09:44 2022
 	NAMESPACE: kube-system
 	STATUS: deployed
 	REVISION: 1
 	TEST SUITE: None

(2) 설치 확인 작업

cluster 및 node 정보 확인

 (🍎 |kubernetes-admin@kubernetes:default) root@k8s-m:~# kubectl cluster-info
 	Kubernetes control plane is running at https://192.168.10.10:6443
 	CoreDNS is running at https://192.168.10.10:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
    	
 	To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
 (🍎 |kubernetes-admin@kubernetes:default) root@k8s-m:~# kubectl get nodes -o wide
 	NAME     STATUS     ROLES                  AGE     VERSION   INTERNAL-IP      EXTERNAL-IP   OS-IMAGE           KERNEL-VERSION    CONTAINER-RUNTIME
 	k8s-m    NotReady   control-plane,master   3h40m   v1.23.6   192.168.10.10    <none>        Ubuntu 22.04 LTS   5.15.0-1005-aws   docker://20.10.16
 	k8s-w1   NotReady   <none>                 3h39m   v1.23.6   192.168.10.101   <none>        Ubuntu 22.04 LTS   5.15.0-1005-aws   docker://20.10.16
 	k8s-w2   NotReady   <none>                 3h39m   v1.23.6   192.168.10.102   <none>        Ubuntu 22.04 LTS   5.15.0-1005-aws   docker://20.10.16
 	k8s-w3   NotReady   <none>                 3h39m   v1.23.6   192.168.20.103   <none>        Ubuntu 22.04 LTS   5.15.0-1005-aws   docker://20.10.16
 (🍎 |DOIK-Lab:default) root@k8s-m:~# systemctl status kubelet
 	● kubelet.service - kubelet: The Kubernetes Node Agent
 	     Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
 	    Drop-In: /etc/systemd/system/kubelet.service.d
 	             └─10-kubeadm.conf
 	     Active: active (running) since Sun 2022-05-22 21:24:01 KST; 3h 50min ago
 	       Docs: https://kubernetes.io/docs/home/
 	   Main PID: 6426 (kubelet)
 	      Tasks: 16 (limit: 4623)
 	     Memory: 39.5M
 	        CPU: 4min 17.733s
 	     CGroup: /system.slice/kubelet.service
 	             └─6426 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.co>
 	May 23 01:09:55 k8s-m kubelet[6426]: E0523 01:09:55.691582    6426 plugins.go:752] "Error dynamically probing plugins" err="error creating>May 23 01:09:55 k8s-m kubelet[6426]: E0523 01:09:55.691782    6426 driver-call.go:262] Failed to unmarshal output for command: init, outpu>May 23 01:09:55 k8s-m kubelet[6426]: W0523 01:09:55.691796    6426 driver-call.go:149] FlexVolume: driver call failed: executable: /usr/li>May 23 01:09:55 k8s-m kubelet[6426]: E0523 01:09:55.691812    6426 plugins.go:752] "Error dynamically probing plugins" err="error creating>May 23 01:09:55 k8s-m kubelet[6426]: E0523 01:09:55.692032    6426 driver-call.go:262] Failed to unmarshal output for command: init, outpu>May 23 01:09:55 k8s-m kubelet[6426]: W0523 01:09:55.692048    6426 driver-call.go:149] FlexVolume: driver call failed: executable: /usr/li>May 23 01:09:55 k8s-m kubelet[6426]: E0523 01:09:55.692065    6426 plugins.go:752] "Error dynamically probing plugins" err="error creating>May 23 01:09:55 k8s-m kubelet[6426]: E0523 01:09:55.692552    6426 driver-call.go:262] Failed to unmarshal output for command: init, outpu>May 23 01:09:55 k8s-m kubelet[6426]: W0523 01:09:55.692563    6426 driver-call.go:149] FlexVolume: driver call failed: executable: /usr/li>May 23 01:09:55 k8s-m kubelet[6426]: E0523 01:09:55.692581    6426 plugins.go:752] "Error dynamically probing plugins" err="error creating>lines 1-23/23 (END)
 (🍎 |DOIK-Lab:default) root@k8s-m:~# kubectl get node -v7
 	I0523 01:15:39.343489   54205 loader.go:372] Config loaded from file:  /root/.kube/config
 	I0523 01:15:39.350372   54205 round_trippers.go:463] GET https://192.168.10.10:6443/api/v1/nodes?limit=500
 	I0523 01:15:39.350496   54205 round_trippers.go:469] Request Headers:
 	I0523 01:15:39.350513   54205 round_trippers.go:473]     Accept: application/json;as=Table;v=v1;g=meta.k8s.io,application/json;as=Table;v=v1beta1;g=meta.k8s.io,application/json
 	I0523 01:15:39.350612   54205 round_trippers.go:473]     User-Agent: kubectl/v1.23.6 (linux/amd64) kubernetes/ad33385
 	I0523 01:15:39.358562   54205 round_trippers.go:574] Response Status: 200 OK in 7 milliseconds
 	NAME     STATUS   ROLES                  AGE     VERSION
 	k8s-m    Ready    control-plane,master   3h51m   v1.23.6
 	k8s-w1   Ready    <none>                 3h51m   v1.23.6
 	k8s-w2   Ready    <none>                 3h51m   v1.23.6
 	k8s-w3   Ready    <none>                 3h51m   v1.23.6

kube-system에 설치된 components 확인

 (🍎 |DOIK-Lab:default) root@k8s-m:~# kubectl get pod -A
 	NAMESPACE            NAME                                                              READY   STATUS    RESTARTS   AGE
 	kube-system          calico-kube-controllers-7c845d499-v5qfh                           1/1     Running   0          6m52s
 	kube-system          calico-node-cpwhx                                                 1/1     Running   0          6m52s
 	kube-system          calico-node-njvrx                                                 1/1     Running   0          6m52s
 	kube-system          calico-node-sn7tg                                                 1/1     Running   0          6m52s
 	kube-system          calico-node-x4r8b                                                 1/1     Running   0          6m52s
 	kube-system          coredns-64897985d-856gx                                           1/1     Running   0          3h52m
 	kube-system          coredns-64897985d-m7l58                                           1/1     Running   0          3h52m
 	kube-system          etcd-k8s-m                                                        1/1     Running   0          3h52m
 	kube-system          kube-apiserver-k8s-m                                              1/1     Running   0          3h52m
 	kube-system          kube-controller-manager-k8s-m                                     1/1     Running   0          3h52m
 	kube-system          kube-proxy-dvcnf                                                  1/1     Running   0          3h52m
 	kube-system          kube-proxy-gxb6c                                                  1/1     Running   0          3h52m
 	kube-system          kube-proxy-ts8ht                                                  1/1     Running   0          3h52m
 	kube-system          kube-proxy-x6kkd                                                  1/1     Running   0          3h52m
 	kube-system          kube-scheduler-k8s-m                                              1/1     Running   0          3h52m
 	kube-system          metrics-server-6c8bfb487b-r8zs2                                   1/1     Running   0          6m44s
 	kube-system          nfs-provisioner-nfs-subdir-external-provisioner-7d9776885d5b7h5   1/1     Running   0          6m38s
 	local-path-storage   local-path-provisioner-dbd774c5c-tjfnh                            1/1     Running   0          6m44s

3. 참고 자료

🚀가시다님 노션🚀

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[Database/Kubernetes/DOIK] AWS EC2에 Vanilla Kubernetes 실습 환경 배포

0. 전체 구성도

1. Cloudfarmation으로 자동 배포

0단계 : EC2 접속에 사용하는 SSH Key 생성

1단계 : 템플릿 지정

2단계 : 스택 세부 정보 지정

3단계 : 스택 옵션 구성

4단계 : 검토

2. Cluster 생성 및 Component 설치

(1) 설치 후, 기본 setup

(2) 설치 확인 작업

3. 참고 자료

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