json3

{
 cat > worker0.mylabserver.com-csr.json << EOF
 {
   "CN": "system:node:worker0.mylabserver.com",
   "key": {
     "algo": "rsa",
     "size": 2048
   },
   "names": [
     {
       "C": "US",
       "L": "Portland",
       "O": "system:nodes",
       "OU": "Kubernetes The Hard Way",
       "ST": "Oregon"
     }
   ]
 }
 EOF

 cfssl gencert \
   -ca=ca.pem \
   -ca-key=ca-key.pem \
   -config=ca-config.json \
   -hostname=172.34.1.0,worker0.mylabserver.com \
   -profile=kubernetes \
   worker0.mylabserver.com-csr.json | cfssljson -bare worker0.mylabserver.com

 cat > worker1.mylabserver.com-csr.json << EOF
 {
   "CN": "system:node:worker1.mylabserver.com",
   "key": {
     "algo": "rsa",
     "size": 2048
   },
   "names": [
     {
       "C": "US",
       "L": "Portland",
       "O": "system:nodes",
       "OU": "Kubernetes The Hard Way",
       "ST": "Oregon"
     }
   ]
 }
 EOF

 cfssl gencert \
   -ca=ca.pem \
   -ca-key=ca-key.pem \
   -config=ca-config.json \
   -hostname=172.34.1.1,worker1.mylabserver.com \
   -profile=kubernetes \
   worker1.mylabserver.com-csr.json | cfssljson -bare worker1.mylabserver.com

 }