kubernetes 설치

* ubuntu 20.04 LTS 사용

* master 192.168.2.10/24 | work1 192.168.2.11/24 | work2 192.168.2.12/24

참고 - https://kubernetes.io/ko/docs/setup/production-environment/tools/kubeadm/install-kubeadm/

kubeadm 설치하기

# master, work1, work2
swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

# docker repository 사용
apt update
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

# containerd 설치
apt-get update
apt-get install docker-ce docker-ce-cli containerd.io   

systemctl status containerd 

cat <<EOF | tee -a /etc/containerd/config.toml
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
SystemdCgroup = true
EOF

sed -i 's/^disabled_plugins \=/\#disabled_plugins \=/g' /etc/containerd/config.toml
systemctl restart containerd

# 설치 확인
ls /var/run/containerd/containerd.sock

# kubernetes 관련 패키지 설치
mkdir /etc/apt/keyrings
apt-get update
apt-get install -y apt-transport-https ca-certificates curl

curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-archive-keyring.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-get install -y kubelet kubeadm kubectl
apt-mark hold kubelet kubeadm kubectl

# net filter bridge 설정
modprobe br_netfilter
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables

우선 모든 노드에서 위 명령을 실행해준다

* 모든 명령은 root에서 실행함

 

# master
kubeadm reset
kubeadm init
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config

# cilium 설치
curl -LO https://github.com/cilium/cilium-cli/releases/latest/download/cilium-linux-amd64.tar.gz
tar xzvfC cilium-linux-amd64.tar.gz /usr/local/bin
rm cilium-linux-amd64.tar.gz
cilium install

# 설치 확인
cilium status

master에서 위 명령들을 실행한 후 cilium status에 cilium과 operator에 ok가 떠있으면 된다

 

# work1, work2
kubeadm join 192.168.2.10:6443 --token [token] --discovery-token-ca-cert-hash [hash]

# master
kubectl get nodes

# kubectl이 실행되지않을시
unset KUBECONFIG
export KUBECONFIG=/etc/kubernetes/admin.conf

master에서 kubectl init 실행시 아래쪽에 kubeadm join ~~~ 라는 명령어가 나오는데

해당 명령어를 복사해서 work1,2에 넣어서 master에 join 해준다음

master에서 node를 확인해 join이 되어있는지 status가 ready인지 확인해준다