bootstrapping the etcd cluster

the following commands have to execute on each master instance


on master-1

# get etcd
> wget -q --show-progress --https-only --timestamping \
  "https://github.com/coreos/etcd/releases/download/v3.3.9/etcd-v3.3.9-linux-amd64.tar.gz"

# extract etcd and move them to /usr/local/bin
> {
  tar -xvf etcd-v3.3.9-linux-amd64.tar.gz
  sudo mv etcd-v3.3.9-linux-amd64/etcd* /usr/local/bin/
  }

# create etcd directorys and copy certificates to it
> {
  sudo mkdir -p /etc/etcd /var/lib/etcd
  sudo cp ca.crt etcd-server.key etcd-server.crt /etc/etcd/
  }

# set internal ip environment
> INTERNAL_IP=$(ip addr show enp0s8 | grep "inet " | awk '{print $2}' | cut -d / -f 1)

# show environment
> echo $INTERNAL_IP
  ---
  192.168.5.11

# set etcd name env
> ETCD_NAME=$(hostname -s)

# show env
> echo $ETCD_NAME
  ---
  master-1

on master-2

# get etcd
> wget -q --show-progress --https-only --timestamping \
  "https://github.com/coreos/etcd/releases/download/v3.3.9/etcd-v3.3.9-linux-amd64.tar.gz"

# extract etcd and move them to /usr/local/bin
> {
  tar -xvf etcd-v3.3.9-linux-amd64.tar.gz
  sudo mv etcd-v3.3.9-linux-amd64/etcd* /usr/local/bin/
  }

# create etcd directorys and copy certificates to it
> {
  sudo mkdir -p /etc/etcd /var/lib/etcd
  sudo cp ca.crt etcd-server.key etcd-server.crt /etc/etcd/
  }

# set internal ip environment
> INTERNAL_IP=$(ip addr show enp0s8 | grep "inet " | awk '{print $2}' | cut -d / -f 1)

# show environment
> echo $INTERNAL_IP
  ---
  192.168.5.12

# set etcd name env
> ETCD_NAME=$(hostname -s)

# show env
> echo $ETCD_NAME
  ---
  master-2

create the etcd.service systemd unit file on each node (master-1 & master-2)

cat <<EOF | sudo tee /etc/systemd/system/etcd.service
[Unit]
Description=etcd
Documentation=https://github.com/coreos

[Service]
ExecStart=/usr/local/bin/etcd \\
  --name ${ETCD_NAME} \\
  --cert-file=/etc/etcd/etcd-server.crt \\
  --key-file=/etc/etcd/etcd-server.key \\
  --peer-cert-file=/etc/etcd/etcd-server.crt \\
  --peer-key-file=/etc/etcd/etcd-server.key \\
  --trusted-ca-file=/etc/etcd/ca.crt \\
  --peer-trusted-ca-file=/etc/etcd/ca.crt \\
  --peer-client-cert-auth \\
  --client-cert-auth \\
  --initial-advertise-peer-urls https://${INTERNAL_IP}:2380 \\
  --listen-peer-urls https://${INTERNAL_IP}:2380 \\
  --listen-client-urls https://${INTERNAL_IP}:2379,https://127.0.0.1:2379 \\
  --advertise-client-urls https://${INTERNAL_IP}:2379 \\
  --initial-cluster-token etcd-cluster-0 \\
  --initial-cluster master-1=https://192.168.5.11:2380,master-2=https://192.168.5.12:2380 \\
  --initial-cluster-state new \\
  --data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

verificate

> sudo ETCDCTL_API=3 etcdctl member list \
  --endpoints=https://127.0.0.1:2379 \
  --cacert=/etc/etcd/ca.crt \
  --cert=/etc/etcd/etcd-server.crt \
  --key=/etc/etcd/etcd-server.key

# output
  ---
  45bf9ccad8d8900a, started, master-2, https://192.168.5.12:2380, https://192.168.5.12:2379
  54a5796a6803f252, started, master-1, https://192.168.5.11:2380, https://192.168.5.11:2379

— copyleft —

all commands shown on this page are from mmumshad’s fork of “kubernetes-the-hard-way” by kelseyhightower on github