kubeadm安装单机k8s

适用于：centos7

升级内核

脚本安装方式

cd /tmp && curl -sL https://github.com/weiliang-ms/k8s-install/archive/v0.0.2.tar.gz | tar xz
sh /tmp/k8s-install-0.0.2/kubeadm/single.sh

手动安装方式

配置yum源

安装docker

关闭防火墙

systemctl stop firewalld && systemctl disable firewalld
iptables -F && iptables -X && iptables -F -t nat && iptables -X -t nat && iptables -P FORWARD ACCEPT

关闭swap

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

设置内核参数

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

配置k8s源

cat < /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 

安装依赖

yum install -y epel-release conntrack ipvsadm ipset jq sysstat curl iptables libseccomp yum-utils device-mapper-persistent-data lvm2

安装kubelet等

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

安装命令补全

yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc

启动kubelet

systemctl enable --now kubelet

下载k8s相关镜像

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

修改kubelet配置

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

安装网络

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml