■ 목적
MASTER1대 + NODE 3대의 쿠버네티스 클러스터 구축
■ OS설치
대상: master 1대 + node 3대
Linux 계열 OS 설치
■ OS 기본 환경 구성
대상: master 1대 + node 3대
[yum 최신 업데이트 및 추가 유틸리티 설치]
yum -y update
yum install -y yum-utils device-mapper-persistent-data lvm2 net-tools
[SWAP 설정 Off, 방화벽 Off, SELINUX Disabled 적용]
swapoff -a && sed -i '/swap/s/^/#/' /etc/fstab
systemctl stop firewalld && systemctl disable firewalld
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
■ hosts파일 수정
대상: master 1대 + node 3대
/etc/hosts에 아래와 같이 설정 추가 (IP는 본인 서버 설정에 맞게 적용)
192.168.114.128 master1
192.168.114.131 node1
192.168.114.129 node12
192.168.114.130 node13
■ Docker 설치
대상: master 1대 + node 3대
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install docker-ce docker-ce-cli containerd.io -y
■ Docker 기동
대상: master 1대 + node 3대
systemctl start docker && systemctl enable docker
■ Kubernetes 기본 환경 구성
대상: master 1대 + node 3대
[SWAP 설정 Off, 방화벽 Off, SELINUX Disabled 적용]
swapoff -a && sed -i '/swap/s/^/#/' /etc/fstab
systemctl stop firewalld && systemctl disable firewalld
[네트워크 관련 OS Kenel Tuning]
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
[K8S관련 yum Repository 추가]
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
[K8S 패키지 설치]
yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
systemctl enable --now kubelet && systemctl start kubelet
■ Master 서버 생성
대상: master 1대
kubeadm init --pod-network-cidr 10.244.0.0/16
--pod-network-cidr=10.244.0.0/16 은 Flannel 에서 사용하는 설정이며 변경 가능.
아래 붉은색으로 표시된 부분은 반드시 별도 저장해 둘것
# kubeadm init --pod-network-cidr 10.244.0.0/16
[init] using Kubernetes version: v1.11.2
[preflight] running pre-flight checks
I0903 19:18:37.032588 86064 kernel_validator.go:81] Validating kernel version
I0903 19:18:37.032757 86064 kernel_validator.go:96] Validating kernel config
[preflight/images] Pulling images required for setting up a Kubernetes cluster
[preflight/images] This might take a minute or two, depending on the speed of yo ur internet connection
[preflight/images] You can also perform this action in beforehand using 'kubeadm config images pull'
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/ kubeadm-flags.env"
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[preflight] Activating the kubelet service
[certificates] Generated ca certificate and key.
[certificates] Generated apiserver certificate and key.
[certificates] apiserver serving cert is signed for DNS names [test-k8s-master-n cl kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.c luster.local] and IPs [10.96.0.1 10.106.234.130]
[certificates] Generated apiserver-kubelet-client certificate and key.
[certificates] Generated sa key and public key.
[certificates] Generated front-proxy-ca certificate and key.
[certificates] Generated front-proxy-client certificate and key.
[certificates] Generated etcd/ca certificate and key.
[certificates] Generated etcd/server certificate and key.
[certificates] etcd/server serving cert is signed for DNS names [test-k8s-master -ncl localhost] and IPs [127.0.0.1 ::1]
[certificates] Generated etcd/peer certificate and key.
[certificates] etcd/peer serving cert is signed for DNS names [test-k8s-master-n cl localhost] and IPs [10.106.234.130 127.0.0.1 ::1]
[certificates] Generated etcd/healthcheck-client certificate and key.
[certificates] Generated apiserver-etcd-client certificate and key.
[certificates] valid certificates and keys now exist in "/etc/kubernetes/pki"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager. conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"
[controlplane] wrote Static Pod manifest for component kube-apiserver to "/etc/k ubernetes/manifests/kube-apiserver.yaml"
[controlplane] wrote Static Pod manifest for component kube-controller-manager t o "/etc/kubernetes/manifests/kube-controller-manager.yaml"
[controlplane] wrote Static Pod manifest for component kube-scheduler to "/etc/k ubernetes/manifests/kube-scheduler.yaml"
[etcd] Wrote Static Pod manifest for a local etcd instance to "/etc/kubernetes/m anifests/etcd.yaml"
[init] waiting for the kubelet to boot up the control plane as Static Pods from directory "/etc/kubernetes/manifests"
[init] this might take a minute or longer if the control plane images have to be pulled
[apiclient] All control plane components are healthy after 40.501916 seconds
[uploadconfig] storing the configuration used in ConfigMap "kubeadm-config" in t he "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.11" in namespace kube-system wi th the configuration for the kubelets in the cluster
[markmaster] Marking the node test-k8s-master-ncl as master by adding the label "node-role.kubernetes.io/master=''"
[markmaster] Marking the node test-k8s-master-ncl as master by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[patchnode] Uploading the CRI Socket information "/var/run/dockershim.sock" to t he Node API object "test-k8s-master-ncl" as an annotation
[bootstraptoken] using token: pvpoff.3gi89fsxl6q6vq21
[bootstraptoken] configured RBAC rules to allow Node Bootstrap tokens to post CS Rs in order for nodes to get long term certificate credentials
[bootstraptoken] configured RBAC rules to allow the csrapprover controller autom atically approve CSRs from a Node Bootstrap Token
[bootstraptoken] configured RBAC rules to allow certificate rotation for all nod e client certificates in the cluster
[bootstraptoken] creating the "cluster-info" ConfigMap in the "kube-public" name space
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
Your Kubernetes master has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
You can now join any number of machines by running the following on each node
as root:
kubeadm join 192.168.114.128:6443 --token pvpoff.3gi19fsxl8q6vq47 --discovery-t oken-ca-cert-hash sha256:e57e547d3697386005324524878f42b670db3f83227ff247464f470 f2fddf2d6
■ Flannel Network 설치
대상: master 1대
# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
serviceaccount/flannel created
configmap/kube-flannel-cfg created
daemonset.extensions/kube-flannel-ds created
■ Kubectl 명령어 환경 설정 구성
대상: master 1대 및 필요한 서버
kubectl 클라이언트로 사용할 계정 환경 구성.
아까 master서버에서 별도 기록한 설정을 복사한다.
$ mkdir -p $HOME/.kube
$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
$ sudo chown $(id -u):$(id -g) $HOME/.kube/config
■ Node 서버 구성
대상:Node 서버 3대
아까 master 서버에서 별도 기록한 kubeadm join 명령을 수행하여 클러스터에 join 한다.
$ sudo kubeadm join 192.168.114.128:6443 --token pvpoff.3gi19fsxl8q6vq47 --discovery-token-ca-cert-hash sha256:e57e547d3697386005324524878f42b670db3f83227ff247464f4702fddf2d6
■ 점검
kubectl get node명령을 통해 모든 node가 READY 상태인지 확인한다.
ku# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master-ncl Ready master 19m v1.11.2
kube-node001-ncl Ready <none> 1m v1.11.2
kube-node002-ncl Ready <none> 1m v1.11.2
kube-node003-ncl Ready <none> 1m v1.11.2
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