GCE에서 kops를 이용한 K8s 구성

클러스터 배포용 VM 인스턴스 생성

  • Kubernetes를 구성하기 위한 VM 인스턴스를 생성한다.
  • “ID 및 API 액세스” 항목에서 액세스 범위를 “모든 Cloud API에 대한 전체 액세스 허용” 으로 선택한다. 또는 아래와 같이 서비스 계정에 권한을 설정하고 서비스 계정을 선택해도 된다.
    • GCP 관리 콘솔의 IAM&Admin에서 서비스 계정을 하나 만든다. 서비스 계정이 갖고 있어야 하는 최소한의 권한은 다음과 같다.
    compute admin
    servce account admin
    service account key admin
    service account token creator
    service acount user
    storage admin
    DNS Administrator
    DNS Reader
    • SSH로 연결 & 업데이트
    sabzil@sabzil:~$sudo apt-get update
    sabzil@sabzil:~$sudo apt-get dist-upgrade

kubectl 설치

sabzil@sabzil:~$curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
sabzil@sabzil:~$chmod +x ./kubectl
sabzil@sabzil:~$sudo mv ./kubectl /usr/local/bin/kubectl

kops 설치

sabzil@sabzil:~$wget -O kops https://github.com/kubernetes/kops/releases/download/$(curl -s https://api.github.com/repos/kubernetes/kops/releases/latest | grep tag_name | cut -d '"' -f 4)/kops-linux-amd64
sabzil@sabzil:~$chmod +x ./kops
sabzil@sabzil:~$sudo mv ./kops /usr/local/bin/

GCP Tool 설치

sabzil@sabzil:~$export CLOUD_SDK_REPO="cloud-sdk-$(lsb_release -c -s)"
sabzil@sabzil:~$echo "deb http://packages.cloud.google.com/apt $CLOUD_SDK_REPO main" | sudo tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
sabzil@sabzil:~$sudo apt-get install apt-transport-https ca-certificates
sabzil@sabzil:~$curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
sabzil@sabzil:~$sudo apt-get update && sudo apt-get install google-cloud-sdk
  • 추가 구성요소는 선택적으로 설치 한다. ( sudo apt-get install )
  • GCP를 시작하기 위한 초기화
sabzil@sabzil:~$gcloud init
Welcome! This command will take you through the configuration of gcloud.
Your current configuration has been set to: [default]
You can skip diagnostics next time by using the following flag:
  gcloud init --skip-diagnostics
Network diagnostic detects and fixes local network connection issues.
Checking network connection...done.                                                                                
Reachability Check passed.
Network diagnostic passed (1/1 checks passed).
Choose the account you would like to use to perform operations for 
this configuration:
 [1] xxxxxxxxxxxx-compute@developer.gserviceaccount.com
 [2] Log in with a new account
Please enter your numeric choice: 1

You are logged in as: [xxxxxxxxxxxx-compute@developer.gserviceaccount.com].
Pick cloud project to use: 
 [1] sabzil-000000
 [2] Create a new project
Please enter numeric choice or text value (must exactly match list 
item): 1

Your current project has been set to: [sabzil-000000].

Do you want to configure a default Compute Region and Zone? (Y/n)? y

Which Google Compute Engine zone would you like to use as project 
If you do not specify a zone via a command line flag while working 
with Compute Engine resources, the default is assumed.
 [1] us-east1-b
 [2] us-east1-c
 [3] us-east1-d
 [4] us-east4-c
 [5] us-east4-b
 [6] us-east4-a
 [7] us-central1-c
 [8] us-central1-a
 [9] us-central1-f
 [10] us-central1-b
 [11] us-west1-b
 [12] us-west1-c
 [13] us-west1-a
 [14] europe-west4-a
 [15] europe-west4-b
 [16] europe-west4-c
 [17] europe-west1-b
 [18] europe-west1-d
 [19] europe-west1-c
 [20] europe-west3-c
 [21] europe-west3-a
 [22] europe-west3-b
 [23] europe-west2-c
 [24] europe-west2-b
 [25] europe-west2-a
 [26] asia-east1-b
 [27] asia-east1-a
 [28] asia-east1-c
 [29] asia-southeast1-b
 [30] asia-southeast1-a
 [31] asia-southeast1-c
 [32] asia-northeast1-b
 [33] asia-northeast1-c
 [34] asia-northeast1-a
 [35] asia-south1-c
 [36] asia-south1-b
 [37] asia-south1-af
 [38] australia-southeast1-b
 [39] australia-southeast1-c
 [40] australia-southeast1-a
 [41] southamerica-east1-b
 [42] southamerica-east1-c
 [43] southamerica-east1-a
 [44] asia-east2-a
 [45] asia-east2-b
 [46] asia-east2-c
 [47] asia-northeast2-a
 [48] asia-northeast2-b
 [49] asia-northeast2-c
 [50] europe-north1-a
Did not print [12] options.
Too many options [62]. Enter "list" at prompt to print choices fully.
Please enter numeric choice or text value (must exactly match list 
item): 8

Your project default Compute Engine zone has been set to [us-central1-a].
You can change it by running [gcloud config set compute/zone NAME].
Your project default Compute Engine region has been set to [us-central1].
You can change it by running [gcloud config set compute/region NAME].
Created a default .boto configuration file at [/home/sabzil/.boto]. See this file and
[https://cloud.google.com/storage/docs/gsutil/commands/config] for more
information about configuring Google Cloud Storage.
Your Google Cloud SDK is configured and ready to use!
* Commands that require authentication will use xxxxxxxxxxxx-compute@developer.gserviceaccount.com by default
* Commands will reference project `sabzil-000000` by default
* Compute Engine commands will use region `us-central1` by default
* Compute Engine commands will use zone `us-central1-a` by default
Run `gcloud help config` to learn how to change individual settings
This gcloud configuration is called [default]. You can create additional configurations if you work with multiple accounts and/or projects.
Run `gcloud topic configurations` to learn more.
Some things to try next:
* Run `gcloud --help` to see the Cloud Platform services you can interact with. And run `gcloud help COMMAND` to get help on any gcloud command.
* Run `gcloud topic --help` to learn about advanced features of the SDK like arg files and output formatting
  • 선택 사항
    • “Please enter your numeric choice: 1”
    • “Please enter numeric choice or text value (must exactly match list item): 1”
      • 연결하고자 하는 프로젝트인 “[1] sabzil-000000” 를 선택
    • “Do you want to configure a default Compute Region and Zone? (Y/n)? y”
      • 기본으로 제공되고 있는 region과 zone을 사용
    • “Please enter numeric choice or text value (must exactly match list item): 8”

스토리지(버킷) 생성

sabzil@sabzil:~$ gsutil mb gs://sabzil-cluster-state-store
Creating gs://sabzil-cluster-state-store/...
sabzil@sabzil:~$ export KOPS_STATE_STORE=gs://sabzil-cluster-state-store/
  • kops는 클러스터 구성을 유지하기 위한 상태 저장소로서 “Storage"의 “Bucket"을 이용한다.
    • mb: Make buckets
  • Bucket의 이름은 필요한 형태로 만들면 된다. (ex, sabzil-cluster-state-store)

클러스터 생성

  • Google Cloud에서 사용할 정보
sabzil@sabzil:~$ PROJECT=`gcloud config get-value project`
sabzil@sabzil:~$ export KOPS_FEATURE_FLAGS=AlphaAllowGCE # to unlock the GCE features
  • Kubernetes 클러스터 생성(상태 저장소)
sabzil@sabzil:~$ kops create cluster --name=sabzil-cluster.k8s.local --zones=us-central1-a --state=${KOPS_STATE_STORE} --project=${PROJECT}

        Location                addons/dns-controller.addons.k8s.io/k8s-1.6.yaml

        Location                addons/dns-controller.addons.k8s.io/pre-k8s-1.6.yaml

        Location                addons/kube-dns.addons.k8s.io/k8s-1.12.yaml

        Location                addons/kube-dns.addons.k8s.io/k8s-1.6.yaml

        Location                addons/kube-dns.addons.k8s.io/pre-k8s-1.6.yaml

        Location                addons/kubelet-api.rbac.addons.k8s.io/k8s-1.9.yaml

        Location                addons/limit-range.addons.k8s.io/v1.5.0.yaml

        Location                addons/rbac.addons.k8s.io/k8s-1.8.yaml

        Location                addons/storage-gce.addons.k8s.io/v1.6.0.yaml

        Location                addons/storage-gce.addons.k8s.io/v1.7.0.yaml

        Location                backups/etcd/events/control/etcd-cluster-spec

        Location                backups/etcd/main/control/etcd-cluster-spec

        Location                manifests/etcd/events.yaml

        Location                manifests/etcd/main.yaml










        Bucket                  sabzil-cluster-state-store
        Entity                  xxxx-000000000000-compute@developer.gserviceaccount.com
        Role                    WRITER


Must specify --yes to apply changes

Cluster configuration has been created.

 * list clusters with: kops get cluster
 * edit this cluster with: kops edit cluster sabzil-cluster.k8s.local
 * edit your node instance group: kops edit ig --name=sabzil-cluster.k8s.local nodes
 * edit your master instance group: kops edit ig --name=sabzil-cluster.k8s.local master-us-central1-a

Finally configure your cluster with: kops update cluster --name sabzil-cluster.k8s.local --yes

  • Kubernetes 클러스터 생성(VM 인스턴스에 직접 생성)
sabzil@sabzil:~$ kops update cluster --name sabzil-cluster.k8s.local --yes
I1106 05:42:52.576477   26628 apply_cluster.go:559] Gossip DNS: skipping DNS validation
W1106 05:42:52.641383   26628 external_access.go:36] TODO: Harmonize gcemodel ExternalAccessModelBuilder with awsmodel
W1106 05:42:52.641597   26628 firewall.go:35] TODO: Harmonize gcemodel with awsmodel for firewall - GCE model is way too open
W1106 05:42:52.641685   26628 firewall.go:63] Adding overlay network for X -> node rule - HACK
W1106 05:42:52.641750   26628 firewall.go:64] We should probably use subnets?
W1106 05:42:52.641824   26628 firewall.go:118] Adding overlay network for X -> master rule - HACK
W1106 05:42:52.770317   26628 storageacl.go:71] we need to split master / node roles
W1106 05:42:52.770353   26628 storageacl.go:86] adding bucket level write ACL to gs://sabzil-cluster-state-store to support etcd backup
W1106 05:42:52.770450   26628 autoscalinggroup.go:108] enabling storage-rw for etcd backups
I1106 05:42:54.889249   26628 executor.go:103] Tasks: 0 done / 66 total; 39 can run
I1106 05:42:55.253887   26628 address.go:123] GCE creating address: "api-sabzil-cluster-k8s-local"
I1106 05:42:55.387139   26628 vfs_castore.go:729] Issuing new certificate: "etcd-peers-ca-events"
I1106 05:42:55.672462   26628 vfs_castore.go:729] Issuing new certificate: "apiserver-aggregator-ca"
I1106 05:42:55.765508   26628 vfs_castore.go:729] Issuing new certificate: "etcd-manager-ca-main"
I1106 05:42:55.985020   26628 vfs_castore.go:729] Issuing new certificate: "etcd-peers-ca-main"
I1106 05:42:56.327905   26628 vfs_castore.go:729] Issuing new certificate: "etcd-clients-ca"
I1106 05:42:56.593223   26628 vfs_castore.go:729] Issuing new certificate: "ca"
I1106 05:42:56.803652   26628 vfs_castore.go:729] Issuing new certificate: "etcd-manager-ca-events"
I1106 05:43:08.063339   26628 executor.go:103] Tasks: 39 done / 66 total; 25 can run
I1106 05:43:08.238400   26628 instancetemplate.go:214] We should be using NVME for GCE
I1106 05:43:08.240753   26628 instancetemplate.go:214] We should be using NVME for GCE
I1106 05:43:08.248537   26628 instancetemplate.go:214] We should be using NVME for GCE
I1106 05:43:08.249786   26628 instancetemplate.go:214] We should be using NVME for GCE
I1106 05:43:10.777593   26628 vfs_castore.go:729] Issuing new certificate: "kube-controller-manager"
I1106 05:43:11.412793   26628 vfs_castore.go:729] Issuing new certificate: "kube-scheduler"
I1106 05:43:11.665669   26628 vfs_castore.go:729] Issuing new certificate: "apiserver-proxy-client"
I1106 05:43:11.698639   26628 vfs_castore.go:729] Issuing new certificate: "apiserver-aggregator"
I1106 05:43:12.071948   26628 vfs_castore.go:729] Issuing new certificate: "kubelet-api"
I1106 05:43:12.189613   26628 vfs_castore.go:729] Issuing new certificate: "kubelet"
I1106 05:43:12.465094   26628 vfs_castore.go:729] Issuing new certificate: "kops"
I1106 05:43:12.539693   26628 vfs_castore.go:729] Issuing new certificate: "master"
I1106 05:43:12.633503   26628 vfs_castore.go:729] Issuing new certificate: "kube-proxy"
I1106 05:43:12.812512   26628 vfs_castore.go:729] Issuing new certificate: "kubecfg"
I1106 05:43:21.263578   26628 executor.go:103] Tasks: 64 done / 66 total; 2 can run
I1106 05:43:32.802331   26628 executor.go:103] Tasks: 66 done / 66 total; 0 can run
I1106 05:43:33.070437   26628 update_cluster.go:294] Exporting kubecfg for cluster
kops has set your kubectl context to sabzil-cluster.k8s.local

Cluster is starting.  It should be ready in a few minutes.

 * validate cluster: kops validate cluster
 * list nodes: kubectl get nodes --show-labels
 * ssh to the master: ssh -i ~/.ssh/id_rsa admin@api.sabzil-cluster.k8s.local
 * the admin user is specific to Debian. If not using Debian please use the appropriate user based on your OS.
 * read about installing addons at: https://github.com/kubernetes/kops/blob/master/docs/addons.md.

  • 클러스터 상태 확인(클러스터 생성 완료되고 5~10분뒤에 확인)
sabzil@sabzil:~$ kops validate cluster
Using cluster from kubectl context: sabzil-cluster.k8s.local

Validating cluster sabzil-cluster.k8s.local

I1106 05:50:12.213436   26733 gce_cloud.go:273] Scanning zones: [us-central1-c us-central1-a us-central1-f us-central1-b]
NAME                    ROLE    MACHINETYPE     MIN     MAX     SUBNETS
master-us-central1-a    Master  n1-standard-1   1       1       us-central1
nodes                   Node    n1-standard-2   2       2       us-central1

NAME                            ROLE    READY
master-us-central1-a-dg9q       master  True
nodes-2f58                      node    True
nodes-9t48                      node    True

Your cluster sabzil-cluster.k8s.local is ready
  • kubectl 동작 확인
sabzil@sabzil:~$ kubectl get pods --all-namespaces
NAMESPACE     NAME                                                READY   STATUS    RESTARTS   AGE
kube-system   dns-controller-7f9457558d-fmnpk                     1/1     Running   0          4m53s
kube-system   etcd-manager-events-master-us-central1-a-dg9q       1/1     Running   0          3m26s
kube-system   etcd-manager-main-master-us-central1-a-dg9q         1/1     Running   0          4m4s
kube-system   kube-apiserver-master-us-central1-a-dg9q            1/1     Running   1          4m27s
kube-system   kube-controller-manager-master-us-central1-a-dg9q   1/1     Running   0          4m29s
kube-system   kube-dns-66d58c65d5-6nllr                           3/3     Running   0          4m53s
kube-system   kube-dns-66d58c65d5-6qk7c                           3/3     Running   0          3m55s
kube-system   kube-dns-autoscaler-6567f59ccb-xzp98                1/1     Running   0          4m51s
kube-system   kube-proxy-master-us-central1-a-dg9q                1/1     Running   0          4m6s
kube-system   kube-proxy-nodes-2f58                               1/1     Running   0          3m41s
kube-system   kube-proxy-nodes-9t48                               1/1     Running   0          3m25s
kube-system   kube-scheduler-master-us-central1-a-dg9q            1/1     Running   0          4m33s