Kubernetes 설치 추가

▩ kubectl 이 다운로드가 안되었다

[vagrant@ms ~]$ sudo find / -name kubectl
[vagrant@ms ~]$

 

▷install_cluster.sh 에서 kubernetes.repo 부분이 작동이 안된듯 하다

### bash script for install kubernetes cluster

#Set the time zone to local time and set the exact time

timedatectl set-timezone Asia/Seoul

yum install -y yum-utils

modprobe overlay

modprobe br_netfilter

yum install -y iproute-tc

cat <<EOF | tee /etc/modules-load.d/containerd.conf

overlay

br_netfilter

EOF

cat <<EOF | tee /etc/sysctl.d/99-kubernetes-cri.conf

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

net.ipv4.ip_forward = 1

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

EOF

# apply the 99-kubernetes-cri.conf file immediately

sysctl --system

# disable firewall

systemctl disable firewalld

systemctl stop firewalld

yum-config-manager \

    --add-repo \

    https://download.docker.com/linux/centos/docker-ce.repo

yum install -y containerd.io

mkdir -p /etc/containerd

containerd config default | tee /etc/containerd/config.toml

sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml

systemctl restart containerd

systemctl enable containerd

# disable selinux

setenforce 0

sed -i 's/^SELINUX=enforcing/SELINUX=permissive/' /etc/selinux/config

cat <<EOF | tee /etc/yum.repos.d/kubernetes.repo

[kubernetes]

name=Kubernetes

baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-\$basearch

enabled=1

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=kubelet kubeadm kubectl

EOF

yum install -y kubelet kubeadm kubectl \

--disableexcludes=kubernetes

systemctl enable --now kubelet

# disable swap space

swapoff -a

sed -e '/swap/s/^/#/' -i /etc/fstab

# add cluster nodes in the hosts file

tee /etc/hosts <<EOF

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

:1         localhost localhost.localdomain localhost6 localhost6.localdomain6

EOF

echo "192.168.98.10   ms.example.com      ms" >> /etc/hosts

echo "192.168.98.20   wk1.example.com     wk1" >> /etc/hosts

echo "192.168.98.30   wk2.example.com     wk2" >> /etc/hosts

 

 

▩ kubelet 직접 설치 >> 불가능

 

 

▶ repo 가 바뀌었다 ( 최신버전 )

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/
enabled=1
gpgcheck=1
gpgkey=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/repodata/repomd.xml.key
EOF

 

▶ install_cluster.sh 수정

### bash script for install kubernetes cluster

#Set the time zone to local time and set the exact time

timedatectl set-timezone Asia/Seoul

yum install -y yum-utils

modprobe overlay

modprobe br_netfilter

yum install -y iproute-tc

cat <<EOF | tee /etc/modules-load.d/containerd.conf

overlay

br_netfilter

EOF

cat <<EOF | tee /etc/sysctl.d/99-kubernetes-cri.conf

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

net.ipv4.ip_forward = 1

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

EOF

# apply the 99-kubernetes-cri.conf file immediately

sysctl --system

# disable firewall

systemctl disable firewalld

systemctl stop firewalld

yum-config-manager \

    --add-repo \

    https://download.docker.com/linux/centos/docker-ce.repo

yum install -y containerd.io

mkdir -p /etc/containerd

containerd config default | tee /etc/containerd/config.toml

sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml

systemctl restart containerd

systemctl enable containerd

# disable selinux

setenforce 0

sed -i 's/^SELINUX=enforcing/SELINUX=permissive/' /etc/selinux/config

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo

[kubernetes]

name=Kubernetes

baseurl=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/

enabled=1

gpgcheck=1

gpgkey=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/repodata/repomd.xml.key

EOF

yum install -y kubelet kubeadm kubectl \

--disableexcludes=kubernetes

systemctl enable --now kubelet

# disable swap space

swapoff -a

sed -e '/swap/s/^/#/' -i /etc/fstab

# add cluster nodes in the hosts file

tee /etc/hosts <<EOF

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

:1         localhost localhost.localdomain localhost6 localhost6.localdomain6

EOF

echo "192.168.98.10   ms.example.com      ms" >> /etc/hosts

echo "192.168.98.20   wk1.example.com     wk1" >> /etc/hosts

echo "192.168.98.30   wk2.example.com     wk2" >> /etc/hosts

 

● powershell 에서 vagrant provision 으로 다시 올린다

▩ 아래와 같은 오류로 잘 안될 때가 있는데 그럴 때에는 캐시를 삭제하고 다시 provision 해보자

E0307 12:57:47.309816    7240 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

sudo rm -r /var/cache/dnf

 

 

● kubernetes 정상 작동

[vagrant@ms ~]$ kubectl get nodes
NAME              STATUS   ROLES           AGE   VERSION
ms.example.com    Ready    control-plane   97s   v1.29.2
wk1.example.com   Ready    <none>          74s   v1.29.2
wk2.example.com   Ready    <none>          68s   v1.29.2

 

 

# kubeadm 이 설치하기 가장 편리할 듯 하다

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

kubeadm 설치하기

 

 

 

● kubectl 자동완성 안될 때 다시 확인

>> .bashrc 가 프로비전 3번했더니 3개가 생겼다

>> 그냥 source .bashrc 입력하여 해결하자

[vagrant@ms ~]$ cat .bashrc
# .bashrc

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

# User specific environment
if ! [[ "$PATH" =~ "$HOME/.local/bin:$HOME/bin:" ]]
then
    PATH="$HOME/.local/bin:$HOME/bin:$PATH"
fi
export PATH

# Uncomment the following line if you don't like systemctl's auto-paging feature:
# export SYSTEMD_PAGER=

# User specific aliases and functions
source <(kubectl completion bash)
source <(kubectl completion bash)
source <(kubectl completion bash)