手动搭建Kubernetes1.8高可用集群（2）TLS Certificates-BravePro

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#!/bin/bash　　#MASTERS是所有Master节点，有多少填多少
　　MASTERS="node1 node2"
　　#HOSTS代表所有节点，有多少填多少
　　HOSTS="node1 node2 node3 node4"
　　set -o errexit
　　set -o pipefail
　　usage()
　　{
　　cat  /dev/null 2>&1
　　openssl req -x509 -new -nodes -key ca-key.pem -days 10000 -out ca.pem -subj "/CN=kube-ca" > /dev/null 2>&1
　　fi
　　gen_key_and_cert() {
　　local name=$1
　　local subject=$2
　　openssl genrsa -out ${name}-key.pem 2048 > /dev/null 2>&1
　　openssl req -new -key ${name}-key.pem -out ${name}.csr -subj "${subject}" -config ${CONFIG} > /dev/null 2>&1
　　openssl x509 -req -in ${name}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out ${name}.pem -days 3650 -extensions v3_req -extfile ${CONFIG} > /dev/null 2>&1
　　}
　　# Admins
　　if [ -n "$MASTERS" ]; then
　　# kube-apiserver
　　# Generate only if we don't have existing ca and apiserver certs
　　if ! [ -e "$SSLDIR/ca-key.pem" ] || ! [ -e "$SSLDIR/apiserver-key.pem" ]; then
　　gen_key_and_cert "apiserver" "/CN=kube-apiserver"
　　cat ca.pem >> apiserver.pem
　　fi
　　# If any host requires new certs, just regenerate scheduler and controller-manager master certs
　　# kube-scheduler
　　gen_key_and_cert "kube-scheduler" "/CN=system:kube-scheduler"
　　# kube-controller-manager
　　gen_key_and_cert "kube-controller-manager" "/CN=system:kube-controller-manager"
　　for host in $MASTERS; do
　　cn="${host%%.*}"
　　# admin
　　gen_key_and_cert "admin-${host}" "/CN=kube-admin-${cn}/O=system:masters"
　　done
　　fi
　　# Nodes
　　if [ -n "$HOSTS" ]; then
　　for host in $HOSTS; do
　　cn="${host%%.*}"
　　gen_key_and_cert "node-${host}" "/CN=system:node:${cn,,}/O=system:nodes"
　　done
　　fi
　　# system:node-proxier
　　if [ -n "$HOSTS" ]; then
　　for host in $HOSTS; do
　　# kube-proxy
　　gen_key_and_cert "kube-proxy-${host}" "/CN=system:kube-proxy/O=system:node-proxier"
　　done
　　fi
　　# Install certs
　　mv *.pem ${SSLDIR}/