k8s安装

说明

本事件适合刚刚装系统的新机子，前提是可以ping通www.baidu。yum可以下载软件

本实验模拟单机k8s，主机ip为172.26.50.222

关闭防火墙

systemctl status firewalld
systemctl stop firewalld
systemctl disable firewalld
getenforce
setenforce 0
vim /etc/sysconfig/selinux 修改为disabled
iptables -F

关闭swap分区

记得重启使其生效，否则后面进行初始化会提示
vim /etc/fstab 注释swap
reboot

修改主机名

hostnamectl set-hostname k8s-master

将IP主机名写入主机清单

cat >> /etc/hosts << EOF
172.26.50.222 k8s-master
EOF

打开流量转发

cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
sysctl --system

下载docker

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum list docker-ce --showduplicates |sort -r
yum -y install docker-ce-20* docker-ce-cli-20*
systemctl enable docker && systemctl start docker
docker --version

配docker镜像加速

我这里用的道客的
vim /etc/docker/daemon.json
{
"registry-mirrors": ["https://docker.m.daocloud.io"],
"exec-opts":["native.cgroupdriver=systemd"]
}
systemctl daemon-reload
systemctl restart docker

添加阿里云yum源

配置安装k8s需要的yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
vim /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0

yum clean all
yum makecache fast

安装kubeadm，kubelet和kubectl

yum install -y kubelet-1.21.0 kubeadm-1.21.0 kubectl-1.21.0
systemctl restart kubelet
systemctl enable kubelet

执行

docker pull coredns/coredns:1.8.0
docker tag coredns/coredns:1.8.0 registry.aliyuncs.com/google_containers/coredns/coredns:v1.8.0

主节点执行，初始化

kubeadm init --apiserver-advertise-address=192.168.121.137 --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.21.0 --service-cidr=10.96.0.0/12 --pod-network-cidr=10.244.0.0/16

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