07_etcd.sh

#!/usr/bin/env bash

wget --timestamping \
  "https://github.com/etcd-io/etcd/releases/download/v3.3.20/etcd-v3.3.20-linux-amd64.tar.gz"


tar -xvf etcd-v3.3.20-linux-amd64.tar.gz
sudo mv etcd-v3.3.20-linux-amd64/etcd* /usr/local/bin/

sudo mkdir -p /etc/etcd /var/lib/etcd
sudo cp ../kubernetes_setup_files/ca.pem ../kubernetes_setup_files/kubernetes-key.pem ../kubernetes_setup_files/kubernetes.pem /etc/etcd/

INTERNAL_IP=$(ip addr show eth0 | grep -oP '(?<=inet\s)\d+(\.\d+){3}')

ETCD_NAME=$(hostname -s)

cat > etcd.service <<EOF
[Unit]
Description=etcd
Documentation=https://github.com/coreos

[Service]
ExecStart=/usr/local/bin/etcd \\
  --name ${ETCD_NAME} \\
  --cert-file=/etc/etcd/kubernetes.pem \\
  --key-file=/etc/etcd/kubernetes-key.pem \\
  --peer-cert-file=/etc/etcd/kubernetes.pem \\
  --peer-key-file=/etc/etcd/kubernetes-key.pem \\
  --trusted-ca-file=/etc/etcd/ca.pem \\
  --peer-trusted-ca-file=/etc/etcd/ca.pem \\
  --peer-client-cert-auth \\
  --client-cert-auth \\
  --initial-advertise-peer-urls https://${INTERNAL_IP}:2380 \\
  --listen-peer-urls https://${INTERNAL_IP}:2380 \\
  --listen-client-urls https://${INTERNAL_IP}:2379,http://127.0.0.1:2379 \\
  --advertise-client-urls https://${INTERNAL_IP}:2379 \\
  --initial-cluster-token etcd-cluster-0 \\
  --initial-cluster controller-1=https://10.0.0.11:2380,controller-2=https://10.0.0.12:2380,controller-3=https://10.0.0.13:2380 \\
  --initial-cluster-state new \\
  --data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

sudo mv etcd.service /etc/systemd/system/

sudo systemctl daemon-reload
sudo systemctl enable etcd
sudo systemctl start etcd