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kubeadm-offline.md

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配置k8s源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
        http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

yum clean all && yum makecache

安装yum插件

yum install yum-plugin-downloadonly -y

导出依赖

yum install --downloadonly --downloaddir=/root/k8s kubelet-1.15.5 kubeadm-1.15.5 kubectl-1.15.5

安装kububeadm

yum install -y kubelet-1.15.5 kubeadm-1.15.5 kubectl-1.15.5 --disableexcludes=kubernetes

下载k8s相关镜像

#k8s.gcr.io被墙，需要走微软代理地址
for i in `kubeadm config images list 2>/dev/null |sed 's/k8s.gcr.io\///g'`; do
    docker pull gcr.azk8s.cn/google-containers/${i}
    docker tag gcr.azk8s.cn/google-containers/${i} k8s.gcr.io/${i}
    docker rmi gcr.azk8s.cn/google-containers/${i}
done

离线下载镜像

docker save $(docker images | grep -v REPOSITORY | awk 'BEGIN{OFS=":";ORS=" "}{print $1,$2}') -o /root/k8s/k8s-master.tar

打包资源包

tar zcvf k8s-1.15.5.tar.gz k8s/

离线安装

离线安装docker

上传k8s资源包，解压

tar zxvf k8s-*.tar.gz

导入镜像

docker load -i k8s/k8s-master.tar

安装kubeadm

rpm -ivh k8s/*.rpm --nodeps --force

修改时区

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

关闭防火墙

systemctl stop firewalld && systemctl disable firewalld

关闭swap

swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
sysctl -p

设置内核参数

modprobe br_netfilter
cat << EOF | tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
EOF

sysctl -p /etc/sysctl.d/k8s.conf

修改Linux 资源配置文件,调高ulimit最大打开数和systemctl管理的服务文件最大打开数

echo "* soft nofile 655360" >> /etc/security/limits.conf
echo "* hard nofile 655360" >> /etc/security/limits.conf
echo "* soft nproc 655360" >> /etc/security/limits.conf
echo "* hard nproc 655360" >> /etc/security/limits.conf
echo "* soft memlock unlimited" >> /etc/security/limits.conf
echo "* hard memlock unlimited" >> /etc/security/limits.conf
echo "DefaultLimitNOFILE=1024000" >> /etc/systemd/system.conf
echo "DefaultLimitNPROC=1024000" >> /etc/systemd/system.conf

修改kubelet配置

sed -i "s;KUBELET_EXTRA_ARGS=;KUBELET_EXTRA_ARGS=\"--fail-swap-on=false\";g" /etc/sysconfig/kubelet

配置hostname

172.16.145.140主要替换为实际IP

hostnamectl --static set-hostname master
echo "172.16.145.140 master" >> /etc/hosts

配置kubelet自启动

systemctl enable kubelet

初始化集群

k8sversion=`kubeadm version -o yaml|grep gitVersion|sed 's#gitVersion:##g'|sed 's/ //g'`
echo "k8s version: $k8sversion"
kubeadm init --kubernetes-version=$k8sversion --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap

配置授权

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

下载flannel.yml

下载以下镜像并导入

quay.io/coreos/flannel:v0.11.0-amd64

删除主节点污点

kubectl taint nodes --all node-role.kubernetes.io/master-

安装网络

kubectl apply -f kube-flannel.yml