sudo apt update
sudo apt-get install openjdk-17-jdk -y
sudo apt  install gradle -y
sudo apt install maven -y

sudo wget -qO- http://get.docker.com/ | sh

sudo systemctl enable docker
sudo systemctl start docker
sudo systemctl enable containerd
sudo systemctl start containerd

jenkins-agent@Jenkins-Agent:~$ sudo docker run --rm hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
c1ec31eb5944: Pull complete
Digest: sha256:1408fec50309afee38f3535383f5b09419e6dc0925bc69891e79d84cc4cdcec6
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

jenkins-agent@Jenkins-Agent:~$ sudo docker rmi $(sudo docker images -q)
Untagged: hello-world:latest
Untagged: hello-world@sha256:1408fec50309afee38f3535383f5b09419e6dc0925bc69891e79d84cc4cdcec6
Deleted: sha256:d2c94e258dcb3c5ac2798d32e1249e42ef01cba4841c2234249495f87264ac5a
Deleted: sha256:ac28800ec8bb38d5c35b49d45a6ac4777544941199075dff8c4eb63e093aa81e

jenkins-agent@Jenkins-Agent:~$ sudo docker images
REPOSITORY   TAG       IMAGE ID   CREATED   SIZE

#sudo mkdir /etc/docker
cat <<EOF | sudo tee /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

# 재시작
sudo systemctl enable docker
sudo systemctl daemon-reload
sudo systemctl restart docker  

# 변경된 cgroup driver 확인
sudo docker info | grep -i cgroup

# swap disable
swapoff -a
echo 0 > /proc/sys/vm/swappiness
sed -e '/swap/ s/^#*/#/' -i /etc/fstab

# 실행 참고
jenkins-agent@Jenkins-Agent:~$ sudo su -
root@Jenkins-Agent:~# swapoff -a
root@Jenkins-Agent:~# echo 0 > /proc/sys/vm/swappiness
root@Jenkins-Agent:~# sed -e '/swap/ s/^#*/#/' -i /etc/fstab

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF

sudo apt-get update

sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
sudo apt-get update

sudo kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=10.0.100.6

jenkins-agent@Jenkins-Agent:~$ kubectl get pods
E0730 04:50:54.162684   25615 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused

E0730 04:50:54.163036   25615 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused

E0730 04:50:54.164441   25615 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused

E0730 04:50:54.164754   25615 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused

E0730 04:50:54.166074   25615 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
The connection to the server localhost:8080 was refused - did you specify the right host or port?

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