K8S Certificates

CA Creation

{

cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "8760h"
    },
    "profiles": {
      "kubernetes": {
        "usages": ["signing", "key encipherment", "server auth", "client auth"],
        "expiry": "8760h"
      }
    }
  }
}
EOF

cat > ca-csr.json <<EOF
{
  "CN": "Kubernetes",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Portland",
      "O": "Kubernetes",
      "OU": "CA",
      "ST": "Oregon"
    }
  ]
}
EOF

cfssl gencert -initca ca-csr.json | cfssljson -bare ca

}

Foo

for instance in us-wrk-01 us-wrk-02 us-wrk-03 us-wrk-04; do
cat > ${instance}-csr.json <<EOF
{
  "CN": "system:node:${instance}",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Nashville",
      "O": "system:nodes",
      "OU": "8 Bit Kubernetes",
      "ST": "Tennessee"
    }
  ]
}
EOF

EXTERNAL_IP=$(dig +short ${instance}.node.8bitwizard.net)
INTERNAL_IP=${instance}.node.8bitwizard.net

cfssl gencert \
  -ca=ca.pem \
  -ca-key=ca-key.pem \
  -config=ca-config.json \
  -hostname=${instance},${INTERNAL_IP},${EXTERNAL_IP} \
  -profile=kubernetes \
  ${instance}-csr.json | cfssljson -bare ${instance}
done

Foo

KUBERNETES_PUBLIC_ADDRESS=10.1.10.6

KUBERNETES_HOSTNAMES=us-ctrl-01,us-ctrl-01.nodes.8bitwizard.net,us-ctrl-02,us-ctrl-02.nodes.8bitwizard.net,us-k8s.svc.8bitwizard.net,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.svc.cluster.local

cat > kubernetes-csr.json <<EOF
{
  "CN": "kubernetes",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "US",
      "L": "Nashville",
      "O": "Kubernetes",
      "OU": "8 Bit Kubernetes",
      "ST": "Tennessee"
    }
  ]
}
EOF

cfssl gencert \
  -ca=ca.pem \
  -ca-key=ca-key.pem \
  -config=ca-config.json \
  -hostname=10.1.42.1,10.1.20.13,10.1.20.14,${KUBERNETES_PUBLIC_ADDRESS},127.0.0.1,${KUBERNETES_HOSTNAMES} \
  -profile=kubernetes \
  kubernetes-csr.json | cfssljson -bare kubernetes