配置創建證書
我們將使用 CloudFlare's PKI 工具 cfssl 來配置 PKI Infrastructure，然後使用它去創建 Certificate Authority（CA）， 併爲 etcd、kube-apiserver、kubelet 以及 kube-proxy 創建 TLS 證書。
Certificate Authority
本節創建用於生成其他 TLS 證書的 Certificate Authority。
新建 CA 配置文件
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "8760h"
},
"profiles": {
"kubernetes": {
"usages": ["signing", "key encipherment", "server auth", "client auth"],
"expiry": "8760h"
}
}
}
}
EOF新建 CA 憑證簽發請求文件:
cat > ca-csr.json <<EOF
{
"CN": "Kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "US",
"L": "Portland",
"O": "Kubernetes",
"OU": "CA",
"ST": "Oregon"
}
]
}
EOF生成 CA 憑證和私鑰:
cfssl gencert -initca ca-csr.json | cfssljson -bare ca結果將生成以下兩個文件：
ca-key.pem
ca.pemclient 與 server 憑證
本節將創建用於 Kubernetes 組件的 client 與 server 憑證，以及一個用於 Kubernetes admin 用戶的 client 憑證。
Admin 客戶端憑證
創建 admin client 憑證簽發請求文件:
cat > admin-csr.json <<EOF
{
"CN": "admin",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "US",
"L": "Portland",
"O": "system:masters",
"OU": "Kubernetes The Hard Way",
"ST": "Oregon"
}
]
}
EOF創建 admin client 憑證和私鑰:
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
admin-csr.json | cfssljson -bare admin結果將生成以下兩個文件
admin-key.pem
admin.pemKubelet 客戶端憑證
Kubernetes 使用 special-purpose authorization mode（被稱作 Node Authorizer）授權來自 Kubelet 的 API 請求。爲了通過 Node Authorizer 的授權, Kubelet 必須使用一個署名爲 system:node:<nodeName> 的憑證來證明它屬於 system:nodes 用戶組。本節將會給每臺 worker 節點創建符合 Node Authorizer 要求的憑證。
給每臺 worker 節點創建憑證和私鑰：
for instance in worker-0 worker-1 worker-2; do
cat > ${instance}-csr.json <<EOF
{
"CN": "system:node:${instance}",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "US",
"L": "Portland",
"O": "system:nodes",
"OU": "Kubernetes The Hard Way",
"ST": "Oregon"
}
]
}
EOF
EXTERNAL_IP=$(gcloud compute instances describe ${instance} \
--format 'value(networkInterfaces[0].accessConfigs[0].natIP)')
INTERNAL_IP=$(gcloud compute instances describe ${instance} \
--format 'value(networkInterfaces[0].networkIP)')
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-hostname=${instance},${EXTERNAL_IP},${INTERNAL_IP} \
-profile=kubernetes \
${instance}-csr.json | cfssljson -bare ${instance}
done結果將產生以下幾個文件：
worker-0-key.pem
worker-0.pem
worker-1-key.pem
worker-1.pem
worker-2-key.pem
worker-2.pemKube-controller-manager 客戶端憑證
cat > kube-controller-manager-csr.json <<EOF
{
"CN": "system:kube-controller-manager",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "US",
"L": "Portland",
"O": "system:kube-controller-manager",
"OU": "Kubernetes The Hard Way",
"ST": "Oregon"
}
]
}
EOF
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager結果將產生以下幾個文件：
kube-controller-manager-key.pem
kube-controller-manager.pemKube-proxy 客戶端憑證
cat > kube-proxy-csr.json <<EOF
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "US",
"L": "Portland",
"O": "system:node-proxier",
"OU": "Kubernetes The Hard Way",
"ST": "Oregon"
}
]
}
EOF
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
kube-proxy-csr.json | cfssljson -bare kube-proxy結果將產生以下兩個文件：
kube-proxy-key.pem
kube-proxy.pemkube-scheduler 證書
cat > kube-scheduler-csr.json <<EOF
{
"CN": "system:kube-scheduler",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "US",
"L": "Portland",
"O": "system:kube-scheduler",
"OU": "Kubernetes The Hard Way",
"ST": "Oregon"
}
]
}
EOF
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
kube-scheduler-csr.json | cfssljson -bare kube-scheduler結果將產生以下兩個文件：
kube-scheduler-key.pem
kube-scheduler.pemKubernetes API Server 證書
爲了保證客戶端與 Kubernetes API 的認證，Kubernetes API Server 憑證 中必需包含 kubernetes-the-hard-way 的靜態 IP 地址。
首先查詢 kubernetes-the-hard-way 的靜態 IP 地址:
KUBERNETES_PUBLIC_ADDRESS=$(gcloud compute addresses describe kubernetes-the-hard-way \
--region $(gcloud config get-value compute/region) \
--format 'value(address)')
KUBERNETES_HOSTNAMES=kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.svc.cluster.local創建 Kubernetes API Server 憑證簽發請求文件:
cat > kubernetes-csr.json <<EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "US",
"L": "Portland",
"O": "Kubernetes",
"OU": "Kubernetes The Hard Way",
"ST": "Oregon"
}
]
}
EOF創建 Kubernetes API Server 憑證與私鑰:
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-hostname=10.32.0.1,10.240.0.10,10.240.0.11,10.240.0.12,${KUBERNETES_PUBLIC_ADDRESS},127.0.0.1,${KUBERNETES_HOSTNAMES} \
-profile=kubernetes \
kubernetes-csr.json | cfssljson -bare kubernetes結果產生以下兩個文件:
kubernetes-key.pem
kubernetes.pemService Account 證書
cat > service-account-csr.json <<EOF
{
"CN": "service-accounts",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "US",
"L": "Portland",
"O": "Kubernetes",
"OU": "Kubernetes The Hard Way",
"ST": "Oregon"
}
]
}
EOF
cfssl gencert \
-ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
service-account-csr.json | cfssljson -bare service-account結果將生成以下兩個文件
service-account-key.pem
service-account.pem分發客戶端和服務器證書
將客戶端憑證以及私鑰複製到每個工作節點上:
for instance in worker-0 worker-1 worker-2; do
gcloud compute scp ca.pem ${instance}-key.pem ${instance}.pem ${instance}:~/
done將服務器憑證以及私鑰複製到每個控制節點上:
for instance in controller-0 controller-1 controller-2; do
gcloud compute scp ca.pem ca-key.pem kubernetes-key.pem kubernetes.pem \
service-account-key.pem service-account.pem ${instance}:~/
done
kube-proxy、kube-controller-manager、kube-scheduler和kubelet客戶端憑證將會在下一節中用來創建客戶端簽發請求文件。
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