[ Kubernetes ] VMware 및 Centos를 이용해 Kubernetes 구성하기

두분 내용 참고

https://unknownhosts.tistory.com/10

VMware에 Kubernetes 환경 구성 해보기

 

https://javacan.tistory.com/entry/k8s-install-in-centos7

Centos 7에 kubeadm을 이용해서 쿠버네티스 (1.13 기준) 설치하기

 

 

1. 사전 세팅 (Master-Node 4대 모두 진행) 

 
 1) Master-Node 간 UUID 중복 확인 (UUID가 같으면 안 됨)

cat /sys/class/dmi/id/product_uuid

 

 2) swap off

 swapoff -a

 

 3) vi /etc/fstab

 swap 부분 주석 처리#

 

 4) selinux disabled 처리

 sestatus

 vi /etc/selinux/config
 disabled 설정

reboot

sestatus

 5) k8s network bride 설정

 vi /etc/sysctl.d/k8s.conf (create)


net.bridge.bridge-nf-call-ip6tables=1
net.bridge.bridge-nf-call-iptables=1

 

 6) host 등록

 vi /etc/hosts

192.168.228.133 kubemaster

192.168.228.134 kubenode1

192.168.228.135 kubenode2

192.168.228.136 kubenode3

 

 7) 필수 패키지 설치

yum install yum-utils device-mapper-persistent-data lvm2

 

 8) Docker 설치

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

yum install docker-ce

systemctl enable docker

 

 9) Kubernetes 설치

cat <<EOF > /etc/yum.repos.d/kubernetes.repo

[kubernetes]

name=Kubernetes

baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64

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

exclude=kube*

EOF


yum install kubelet kubeadm kubectl --disableexclude=kubernetes

 

10) kubelet 자동 시작 등록 및 서버 재부팅

systemctl enable --now kubelet

reboot 


11)Troble shooting (CRI관련)

https://k21academy.com/docker-kubernetes/container-runtime-is-not-running/
$ rm /etc/containerd/config.toml
$ systemctl restart containerd
$ kubeadm init ~~~~~~~  (kubeadm init이나 kubeadm join을 다시 실행)

 

 

 

2. Master 구성 진행


 1) 초기화

kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.228.133 

 

 2) 토큰 확인

 kubeadm join 192.168.139.80:6443 --token 47u4kw.7jwz77lk3gvqqj8j \

 --discovery-token-ca-cert-hash sha256:cf0773ab4da065712f17207a64430cf4809e538f73c15965addec74117fb6465

 

 kubectl token list

 kubectl token craate

 

 3) 환경 변수 세팅

 export KUBECONFIG=/etc/kubernetes/admin.conf

 or

 . bash_profile에 등록

 

 4) Network Add on 설치 (flannel)

 kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

 

 5) Master Node 확인

 kubectl get pod -n kube-system

 

 결과

 coredns-74ff55c5b-8jnng 1/1 Running 0 4h40m

 coredns-74ff55c5b-smds4 1/1 Running 0 4h40m

 etcd-kubemaster 1/1 Running 0 4h40m

 kube-apiserver-kubemaster 1/1 Running 0 4h40m

 kube-controller-manager-kubemaster 1/1 Running 0 4h40m

 kube-flannel-ds-cwqvz 1/1 Running 0 2m3s

 kube-proxy-mxp2l 1/1 Running 0 4h40m

 kube-scheduler-kubemaster 1/1 Running 0 4h40m

6) reboot 후에도 정상적으로 실행되기 위해 아래 설정

$ mkdir -p $HOME/.kube
$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
$ sudo chown $(id -u):$(id -g) $HOME/.kube/config


3. Worker 진행

 1) Cluster Join
kubeadm join 192.168.228.133:6443 --token acnqci.n8u3pewp4fsvpwaa \
        --discovery-token-ca-cert-hash sha256:6ed4187248423285bfd6cfc632742a3832fd1587a13a0c01154c9655d05313e8


 

 3) Master에서 Cluster Join 확인

 kubectl get node

 

 결과

 kubemaster Ready control-plane,master 4h58m v1.20.4

 kubenode1 Ready <none> 14m v1.20.4

 kubenode2 Ready <none> 14m v1.20.4

 kubenode3 Ready <none> 14m v1.20.4