kubernetes1.75 一键安装shell脚本（避坑）kubeadm版

最近开始了解所谓的k8s，上网查全是填坑的教程。但不亲身在坑里待着根本不知道他们为啥要填这个坑。整整两天都在搞这个，本来是记录一下命令，然后改了改写成了脚本，没有实际运行过，扫了一眼应该没大问题，不过k8s在不同机器不同网络环境都会出现不同的坑，我在阿里云的经典网络下创建没问题了，你们有胆自己执行一下试试。另外，关selinux和关firewalld我没写到脚本里。 其实所谓坑不过分三种：墙（pull镜像）、版本统一、耐心。 感谢阿里云提供的镜像和1.6版本时提供的脚本做参考，不过现在阿里云只支持VPC了，不支持经典网络了，现在又不想感谢他们了。。。 这篇文章权当是为填坑大军添一把土吧

#!/bin/bash
#author leoYuan 20171215
#mail:centos@126.com
#script version 1.5
#kubernetes version 1.7.5
USAGE(){
	echo -e "nt$0 [ master | node ]n"
	exit 1
}
KUBE_OS(){
	#内核设置
	# set net.bridge.bridge-nf-call-iptables = 1 to allow bridge data to be send to iptables for further process.
	ipt=$(grep "net.bridge.bridge-nf-call-iptables" /usr/lib/sysctl.d/00-system.conf |wc -l)
	if [ $ipt -gt 0 ];then
	    sed -i '/net.bridge.bridge-nf-call-iptables/d' /usr/lib/sysctl.d/00-system.conf
	fi
	sed -i '$a net.bridge.bridge-nf-call-iptables = 1' /usr/lib/sysctl.d/00-system.conf
	echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
}

KUBE_DOCKER(){
	#安装docker-ce
	yum install -y yum-utils device-mapper-persistent-data lvm2
	yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
	yum -y install docker-ce
	systemctl start docker && systemctl enable docker
	#配置阿里云docker加速器
	tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://6ilgul8q.mirror.aliyuncs.com"]
}
EOF
}

KUBE_KUBE(){
	#安装kube
	tee /etc/yum.repos.d/kube.repo <<-'EOF'
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
EOF
	yum -y install kubelet kubeadm kubectl kubernetes-cni socat
	#设置kube的cgroup-driver和docker一致，此处为cgroupfs
	sed -i 's/cgroup-driver=systemd/cgroup-driver=cgroupfs/' /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
	#设置pause的仓库地址，否则每次创建pod都无法创建成功
	if ! grep -q KUBELET_POD_INFRA_CONTAINER;then
		sed -i '/Service/aEnvironment="KUBELET_POD_INFRA_CONTAINER=--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"' /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
		sed -i 's#ExecStart=/usr/bin/kubelet.*$#& $KUBELET_POD_INFRA_CONTAINER#' /etc/systemd/system/kubelet.service.d/10-kubeadm.conf  
	fi
	systemctl daemon-reload && systemctl restart kubelet
}

#下载kube相关镜像 https://hub.docker.com/r/warrior/
KUBE_PAUSE(){
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0 gcr.io/google_containers/pause-amd64:3.0
}
KUBE_PROXY(){
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/kube-proxy-amd64:v1.7.5
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/kube-proxy-amd64:v1.7.5 gcr.io/google_containers/kube-proxy-amd64:v1.7.5
}
KUBE_IMAGE(){
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/etcd-amd64:3.0.17
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/etcd-amd64:3.0.17 gcr.io/google_containers/etcd-amd64:3.0.17
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/kube-apiserver-amd64:v1.7.5
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/kube-apiserver-amd64:v1.7.5 gcr.io/google_containers/kube-apiserver-amd64:v1.7.5
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/kube-scheduler-amd64:v1.7.5
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/kube-scheduler-amd64:v1.7.5 gcr.io/google_containers/kube-scheduler-amd64:v1.7.5
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/kube-controller-manager-amd64:v1.7.5
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/kube-controller-manager-amd64:v1.7.5 gcr.io/google_containers/kube-controller-manager-amd64:v1.7.5
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/dnsmasq-metrics-amd64:1.0
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/dnsmasq-metrics-amd64:1.0 gcr.io/google_containers/dnsmasq-metrics-amd64:1.0
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/k8s-dns-kube-dns-amd64:1.14.4
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/k8s-dns-kube-dns-amd64:1.14.4 gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.4
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/k8s-dns-dnsmasq-nanny-amd64:1.14.4
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/k8s-dns-dnsmasq-nanny-amd64:1.14.4 gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.4
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/k8s-dns-sidecar-amd64:1.14.4
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/k8s-dns-sidecar-amd64:1.14.4 gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.4
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/kube-discovery-amd64:1.0
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/kube-discovery-amd64:1.0 gcr.io/google_containers/kube-discovery-amd64:1.0
	docker pull registry.cn-hangzhou.aliyuncs.com/google-containers/exechealthz-amd64:1.2
	docker tag registry.cn-hangzhou.aliyuncs.com/google-containers/exechealthz-amd64:1.2 gcr.io/google_containers/exechealthz-amd64:1.2
}
KUBE_DNS(){
	#查看本地网关
	echo -c "The Server GateWay is ";ip route |grep default|cut -d ' ' -f 3
	#修改默认cluster dns地址，和service-cidr网段保持一致
	sed -i "s#KUBELET_DNS_ARGS=--cluster-dns=10.96.0.10 --cluster-domain=cluster.local#KUBELET_DNS_ARGS=--cluster-dns=172.19.0.10 --cluster-domain=cluster.local#g" /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
	systemctl daemon-reload && systemctl start kubelet.service
}
KUBE_INIT(){
	#kubeadm初始化
	echo "If hang long time then execut 'journalctl -xu|kubeadm' in other tty"
	kubeadm init --kubernetes-version=v1.7.5 --service-cidr 172.19.0.0/20 --skip-preflight-checks --token-ttl 0|tee /root/kubeadm.log
	mkdir -p $HOME/.kube
	cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
	chown $(id -u):$(id -g) $HOME/.kube/config
}
KUBE_NET(){
	#网络插件calico
	wget -q https://docs.projectcalico.org/v2.6/getting-started/kubernetes/installation/hosted/kubeadm/1.6/calico.yaml -O /tmp/calico.yaml
	if [ $? === 0 ];then
		kubectl apply -f /tmp/calico.yaml
	else
		echo -e "Can not download calico.yamlnhttps://docs.projectcalico.org/v2.6/getting-started/kubernetes/installation/hosted/kubeadm/1.6/calico.yaml"
		exit 1
	fi
}
KUBE_JOIN(){
#这里的token可以kubeadm token generate计算，这里还没做，下次加上。那这个脚本安装node肯定是不行了！！！
 	kubeadm join --skip-preflight-checks --token 0xx0c4.fexxxxxxeb529 111.222.333.444:6443
}
NODE_UP(){
	KUBE_OS
	KUBE_DOCKER
	KUBE_PAUSE
	KUBE_PROXY
	KUBE_KUBE
	KUBE_DNS
	KUBE_JOIN
}
MASTER_UP(){
        KUBE_OS
        KUBE_DOCKER
        KUBE_PAUSE
	KUBE_PROXY
	KUBE_IMAGE
        KUBE_KUBE
        KUBE_DNS
	KUBE_INIT
	KUBE_NET
}
if [ $# -eq 1 ];then
	case $1 in
		'master') MASTER_UP ;;
		'node') NODE_UP ;;
		'*') USAGE ;;
	esac
else
	USAGE 
fi

（编辑：李大同）

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