devops/kubernetes

kubernetes Hard Way 설치 <5>

Hoony.Song 2023. 5. 30. 11:02
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kubernetes Controller Plane 부트스트래핑

● 두 컨트롤러 노드에서 전부 실행 

○ Control Plane 프로비저닝 

sudo mkdir -p /etc/kubernetes/config

○ 쿠버네티스 컨트롤러 바이너리 다운로드 

wget -q --show-progress --https-only --timestamping \
  "https://storage.googleapis.com/kubernetes-release/release/v1.12.0/bin/linux/amd64/kube-apiserver" \
  "https://storage.googleapis.com/kubernetes-release/release/v1.12.0/bin/linux/amd64/kube-controller-manager" \
  "https://storage.googleapis.com/kubernetes-release/release/v1.12.0/bin/linux/amd64/kube-scheduler" \
  "https://storage.googleapis.com/kubernetes-release/release/v1.12.0/bin/linux/amd64/kubectl"

○ 다운받은 쿠버네티스 컨트롤러 바이너리 설치 

{
  chmod +x kube-apiserver kube-controller-manager kube-scheduler kubectl
  sudo cp kube-apiserver kube-controller-manager kube-scheduler kubectl /usr/local/bin/
}

○ 쿠버네티스 API Server 구성하기 

{
  sudo mkdir -p /var/lib/kubernetes/

  sudo cp ca.pem ca-key.pem kubernetes-key.pem kubernetes.pem \
    service-account-key.pem service-account.pem \
    encryption-config.yaml /var/lib/kubernetes/
}

○ 각각 노드의 내부 주소 변수 선언 ( 컨트롤러1은 1의 주소 2는 2의 주소) 

INTERNAL_IP=(컨트롤러 1은 1의 주소 2는 2의 주소 )

○ 각각 systemd 파일에 작성 할 컨트롤러 1과 2의 주소 변수선언  

CONTROLLER0_IP=192.168.47.128
CONTROLLER1_IP=192.168.47.129

○ kube-apiserver.service systemd 파일 생성 

cat <<EOF | sudo tee /etc/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-apiserver \\
  --advertise-address=${INTERNAL_IP} \\
  --allow-privileged=true \\
  --apiserver-count=2 \\
  --audit-log-maxage=30 \\
  --audit-log-maxbackup=3 \\
  --audit-log-maxsize=100 \\
  --audit-log-path=/var/log/audit.log \\
  --authorization-mode=Node,RBAC \\
  --bind-address=0.0.0.0 \\
  --client-ca-file=/var/lib/kubernetes/ca.pem \\
  --enable-admission-plugins=Initializers,NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota \\
  --enable-swagger-ui=true \\
  --etcd-cafile=/var/lib/kubernetes/ca.pem \\
  --etcd-certfile=/var/lib/kubernetes/kubernetes.pem \\
  --etcd-keyfile=/var/lib/kubernetes/kubernetes-key.pem \\
  --etcd-servers=https://$CONTROLLER0_IP:2379,https://$CONTROLLER1_IP:2379 \\
  --event-ttl=1h \\
  --experimental-encryption-provider-config=/var/lib/kubernetes/encryption-config.yaml \\
  --kubelet-certificate-authority=/var/lib/kubernetes/ca.pem \\
  --kubelet-client-certificate=/var/lib/kubernetes/kubernetes.pem \\
  --kubelet-client-key=/var/lib/kubernetes/kubernetes-key.pem \\
  --kubelet-https=true \\
  --runtime-config=api/all \\
  --service-account-key-file=/var/lib/kubernetes/service-account.pem \\
  --service-cluster-ip-range=10.32.0.0/24 \\
  --service-node-port-range=30000-32767 \\
  --tls-cert-file=/var/lib/kubernetes/kubernetes.pem \\
  --tls-private-key-file=/var/lib/kubernetes/kubernetes-key.pem \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

○ 쿠버네티스 Controller Manager 구성하기 

sudo cp kube-controller-manager.kubeconfig /var/lib/kubernetes/

○ kube-controller-manager.service systemd 파일 생성 

cat <<EOF | sudo tee /etc/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-controller-manager \\
  --address=0.0.0.0 \\
  --cluster-cidr=10.200.0.0/16 \\
  --cluster-name=kubernetes \\
  --cluster-signing-cert-file=/var/lib/kubernetes/ca.pem \\
  --cluster-signing-key-file=/var/lib/kubernetes/ca-key.pem \\
  --kubeconfig=/var/lib/kubernetes/kube-controller-manager.kubeconfig \\
  --leader-elect=true \\
  --root-ca-file=/var/lib/kubernetes/ca.pem \\
  --service-account-private-key-file=/var/lib/kubernetes/service-account-key.pem \\
  --service-cluster-ip-range=10.32.0.0/24 \\
  --use-service-account-credentials=true \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

○ 쿠버네티스 Scheduler 구성하기 

sudo cp kube-scheduler.kubeconfig /var/lib/kubernetes/

○ kube-scheduler.yaml yaml파일 생성 

cat <<EOF | sudo tee /etc/kubernetes/config/kube-scheduler.yaml
apiVersion: componentconfig/v1alpha1
kind: KubeSchedulerConfiguration
clientConnection:
  kubeconfig: "/var/lib/kubernetes/kube-scheduler.kubeconfig"
leaderElection:
  leaderElect: true
EOF

○ kube-scheduler.service systemd 파일 생성 

cat <<EOF | sudo tee /etc/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-scheduler \\
  --config=/etc/kubernetes/config/kube-scheduler.yaml \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

○ 컨트롤러 노드 서비스 시작 

{
  sudo systemctl daemon-reload
  sudo systemctl enable kube-apiserver kube-controller-manager kube-scheduler
  sudo systemctl start kube-apiserver kube-controller-manager kube-scheduler
}

○ 결과 확인 

sudo systemctl status kube-apiserver kube-controller-manager kube-scheduler

○ 컴포넌트 헬스체크 

kubectl get componentstatuses --kubeconfig admin.kubeconfig

이렇게 나오면 정상

NAME                 STATUS    MESSAGE              ERROR
controller-manager   Healthy   ok
scheduler            Healthy   ok
etcd-0               Healthy   {"health": "true"}
etcd-1               Healthy   {"health": "true"}

○ http 상태 검사를 처리 할 기본 웹서버 설치 

sudo apt-get install -y nginx
cat > kubernetes.default.svc.cluster.local <<EOF
server {
  listen      80;
  server_name kubernetes.default.svc.cluster.local;

  location /healthz {
     proxy_pass                    https://127.0.0.1:6443/healthz;
     proxy_ssl_trusted_certificate /var/lib/kubernetes/ca.pem;
  }
}
EOF

{
  sudo mv kubernetes.default.svc.cluster.local \
    /etc/nginx/sites-available/kubernetes.default.svc.cluster.local

  sudo ln -s /etc/nginx/sites-available/kubernetes.default.svc.cluster.local /etc/nginx/sites-enabled/
}

sudo systemctl restart nginx
sudo systemctl enable nginx

○ nginx HTTP 헬스 체크 프록시 테스트

curl -H "Host: kubernetes.default.svc.cluster.local" -i http://127.0.0.1/healthz

이렇게 나오면 정상

HTTP/1.1 200 OK
Server: nginx/1.14.0 (Ubuntu)
Date: Sun, 30 Sep 2018 17:44:24 GMT
Content-Type: text/plain; charset=utf-8
Content-Length: 2
Connection: keep-alive

ok

Kubelet 인증을 위한 RBAC

• Kubelet 인증을 위한 RBAC (컨트롤러 1 이나 2 한 군데에서만 실행 )

○ Kubelet API에 접근 권한이 있는 system:kube-apiserver-to-kubelet ClusterRole을 만듭니다.

cat <<EOF | kubectl apply --kubeconfig admin.kubeconfig -f -
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:kube-apiserver-to-kubelet
rules:
  - apiGroups:
      - ""
    resources:
      - nodes/proxy
      - nodes/stats
      - nodes/log
      - nodes/spec
      - nodes/metrics
    verbs:
      - "*"
EOF

○ system:kube-apiserver-to-kubelet ClusterRole을 kubernetes 사용자에게 바인드

cat <<EOF | kubectl apply --kubeconfig admin.kubeconfig -f -
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: system:kube-apiserver
  namespace: ""
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:kube-apiserver-to-kubelet
subjects:
  - apiGroup: rbac.authorization.k8s.io
    kind: User
    name: kubernetes
EOF

로드 밸런서 작업

● LB에서 작업

○ nginx 설치 

{
  sudo apt-get install -y nginx
  sudo systemctl enable nginx
}

○ nginx.conf 편집

sudo mkdir -p /etc/nginx/tcpconf.d
sudo vi /etc/nginx/nginx.conf

마지막 줄에 추가

include /etc/nginx/tcpconf.d/*;

○ 구성 파일을 만들어 APT 로드 밸런싱 구성 

CONTROLLER0_INTERNAL_IP=192.168.47.128 #(컨트롤러1)
CONTROLLER1_INTERNAL_IP=192.168.47.129 #(컨트롤러2)

cat << EOF | sudo tee /etc/nginx/tcpconf.d/kubernetes.conf
stream {
    upstream kubernetes {
        server ${CONTROLLER0_INTERNAL_IP}:6443;
        server ${CONTROLLER1_INTERNAL_IP}:6443;
    }

    server {
        listen 6443;
        listen 443;
        proxy_pass kubernetes;
    }
}
EOF

○ nginx 설정 리로드 

sudo nginx -s reload

○ 로드 밸런스 고정 ip 

KUBERNETES_PUBLIC_ADDRESS=192.168.47.140
curl --cacert ca.pem https://${KUBERNETES_PUBLIC_ADDRESS}:6443/version

○ 출력 

{
  "major": "1",
  "minor": "12",
  "gitVersion": "v1.12.0",
  "gitCommit": "0ed33881dc4355495f623c6f22e7dd0b7632b7c0",
  "gitTreeState": "clean",
  "buildDate": "2018-09-27T16:55:41Z",
  "goVersion": "go1.10.4",
  "compiler": "gc",
  "platform": "linux/amd64"
}

이렇게 나오면 정상

 

 

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