centos7 --kubeadm安装

One or more machines running one of:
Ubuntu 16.04+
Debian 9
CentOS 7
RHEL 7
Fedora 25/26 (best-effort)
HypriotOS v1.0.1+
Container Linux (tested with 1800.6.0)
内存：2 GB or more of RAM per machine (any less will leave little room for your apps)
cpu：2 CPUs or more
网络：Full network connectivity between all machines in the cluster (public or private network is fine)
独立：Unique hostname, MAC address, and product_uuid for every node. ip link or ifconfig -a ，cat /sys/class/dmi/id/product_uuid
端口开放：Certain ports are open on your machines. See here for more details.
swap：Swap disabled. You MUST disable swap in order for the kubelet to work properly

一、基础配置

#添加google repo源，要翻墙。
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_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=kube*
EOF

#关闭selinux
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config



systemctl enable --now kubelet

二、安装kubelt  kubeadm kubectl

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

三、启动

systemctl enable --now kubelet

其他

#如果防火墙启动的话，可能需要开启下面：
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system