kubeadm-init.sh

#!/usr/bin/env bash
set -e

K8S_CLUSTERNAME="$1"
K8S_VERSION="$2"
NODE_PRIVATE_IP="$3"
NODE_PUBLIC_IP="$4"
K8S_FEATURE_GATES="$5"
POD_NETWORK="10.244.0.0/16"

# Generated with kubeadm config print-default
cat <<EOF > $HOME/kubeadm-config.yml
apiVersion: kubeadm.k8s.io/v1beta1
#bootstrapTokens:
#- groups:
#  - system:bootstrappers:kubeadm:default-node-token
# token: ${TOKEN}
# ttl: 24h0m0s
# usages:
# - signing
# - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: ${NODE_PUBLIC_IP}
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  kubeletExtraArgs:
    cloud-provider: external
# name: ${NODE_NAME}
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  certSANs:
  - ${NODE_PRIVATE_IP}
  extraArgs:
    cloud-provider: external
    feature-gates: ${K8S_FEATURE_GATES}
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta1
certificatesDir: /etc/kubernetes/pki
clusterName: ${K8S_CLUSTERNAME}
controlPlaneEndpoint: ""
controllerManager:
  extraArgs:
    cloud-provider: external
    feature-gates: ""
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: k8s.gcr.io
kind: ClusterConfiguration
kubernetesVersion: ${K8S_VERSION}
networking:
  dnsDomain: cluster.local
  podSubnet: ${POD_NETWORK}
  serviceSubnet: 10.96.0.0/12
scheduler: {}
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
  acceptContentTypes: ""
  burst: 10
  contentType: application/vnd.kubernetes.protobuf
  kubeconfig: /var/lib/kube-proxy/kubeconfig.conf
  qps: 5
clusterCIDR: ${POD_NETWORK}
configSyncPeriod: 15m0s
conntrack:
  max: null
  maxPerCore: 32768
  min: 131072
  tcpCloseWaitTimeout: 1h0m0s
  tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
#healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
  masqueradeAll: false
  masqueradeBit: 14
  minSyncPeriod: 0s
  syncPeriod: 30s
ipvs:
  excludeCIDRs: null
  minSyncPeriod: 0s
  scheduler: ""
  syncPeriod: 30s
kind: KubeProxyConfiguration
#metricsBindAddress: 127.0.0.1:10249
mode: ""
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
resourceContainer: /kube-proxy
udpIdleTimeout: 250ms
EOF

kubeadm init --config $HOME/kubeadm-config.yml