K8s 설치

• Kubeadm

• Kubespray (Kubeadm + Ansible)

• Kops

• Docker Desktop - Kubernetes

• minikube

Kubeadm

1.22.8

kubeadm, kubectl, kubelet 도구 설치

sudo apt-get update

sudo apt-get install -y apt-transport-https ca-certificates curl

sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg

echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

sudo apt-get update

apt-cache madison kubeadm | grep 1.22.8
apt-cache madison kubelet | grep 1.22.8
apt-cache madison kubectl | grep 1.22.8

sudo apt-get install kubeadm=1.22.8-00 kubelet=1.22.8-00 kubectl=1.22.8-00 -y

sudo apt-mark hold kubelet kubeadm kubectl

cgroup driver 오류

docker info | grep 'Cgroup Driver'
 
 Cgroup Driver: cgroupfs

/etc/docker/daemon.json

{
  "exec-opts": ["native.cgroupdriver=systemd"]
}

sudo systemctl restart docker

docker info | grep 'Cgroup Driver'

 Cgroup Driver: systemd

sudo systemctl daemon-reload && sudo systemctl restart kubelet

k8s 클러스터 생성

kubeadm init 실패 시

sudo kubeadm reset

sudo kubeadm init --control-plane-endpoint 192.168.100.100 --pod-network-cidr 172.16.0.0/16 --apiserver-advertise-address 192.168.100.100

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

kubectl get nodes

NAME     STATUS     ROLES                  AGE   VERSION
docker   **NotReady**   control-plane,master   14m   v1.22.8

Calico Network Add-on

kubectl create -f https://projectcalico.docs.tigera.io/manifests/tigera-operator.yaml

curl https://projectcalico.docs.tigera.io/manifests/custom-resources.yaml -O

custom-resources.yaml

...
      cidr: 172.16.0.0/16
...

kubectl create -f custom-resources.yaml

클러스터 상태 확인

kubectl get pods -A   

NAMESPACE          NAME                                       ...
calico-apiserver   calico-apiserver-c9565f67b-2p29k           ...
calico-apiserver   calico-apiserver-c9565f67b-slthl           ...
calico-system      calico-kube-controllers-5d74cd74bc-sg7dn   ...
calico-system      calico-node-tgxks                          ...
calico-system      calico-typha-7447fdc844-txrdb              ...
kube-system        coredns-78fcd69978-4ztkq                   ...
kube-system        coredns-78fcd69978-jpwxx                   ...
kube-system        etcd-docker                                ...
kube-system        kube-apiserver-docker                      ...
kube-system        kube-controller-manager-docker             ...
kube-system        kube-proxy-5st98                           ...
kube-system        kube-scheduler-docker                      ...
tigera-operator    tigera-operator-7cf4df8fc7-kx87z           ...

kubectl get nodes

NAME     STATUS   ROLES                  AGE   VERSION
docker   **Ready**    control-plane,master   30m   v1.22.8

kubectl taint node docker node-role.kubernetes.io/master-

간단한 예제

kubectl create deployment myweb --image=ghcr.io/c1t1d0s7/go-myweb

kubectl get deployments,replicasets,pods

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/myweb   1/1     1            1           4m40s

NAME                              DESIRED   CURRENT   READY   AGE
replicaset.apps/myweb-97dbf5749   1         1         1       4m40s

NAME                        READY   STATUS    RESTARTS   AGE
pod/myweb-97dbf5749-8tq2l   1/1     **Running**   0          4m40s

kubectl expose deployment myweb --port=80 --protocol=TCP --target-port=8080 --name myweb-svc --type=NodePort

kubectl get services

NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP        40m
myweb-svc    NodePort    10.96.114.201   <none>        80:**31891**/TCP   5s

curl 192.168.100.100:**31891**

Hello World!
myweb-97dbf5749-8tq2l

kubectl scale deployment myweb --replicas=3

kubectl get pods

myweb-97dbf5749-8tq2l   1/1     Running       0          12m
myweb-97dbf5749-9bm8l   1/1     Running       0          3m13s
myweb-97dbf5749-n29m2   1/1     Running       0          3m13s

curl 192.168.100.100:**31891**

kubectl delete service myweb-svc
kubectl delete deployment myweb

Worker Node 추가

Docker 설치

sudo apt-get update

sudo apt-get install \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt-get update

sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin

docker info | grep 'Cgroup Driver'
 
 Cgroup Driver: cgroupfs

/etc/docker/daemon.json

{
  "exec-opts": ["native.cgroupdriver=systemd"]
}

sudo systemctl restart docker

docker info | grep 'Cgroup Driver'

 Cgroup Driver: systemd

sudo systemctl daemon-reload && sudo systemctl restart kubelet

sudo usermod -aG docker vagrant

재접속

kubeadm, kubelet, kubectl 설치

sudo apt-get install -y apt-transport-https ca-certificates curl

sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg

echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

sudo apt-get update

sudo apt-get install kubeadm=1.22.8-00 kubelet=1.22.8-00 kubectl=1.22.8-00 -y

K8s Cluster Join

sudo kubeadm join --token 69bz9a.jd5a3qmzlhb66iua 192.168.100.100:6443 \
--discovery-token-ca-cert-hash sha256:73f2901d915c6fe5a5a37a6c1c4c1aa73e36da2c3619e36c16d2387a856bc840