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07-bootstrapping-etcd.md

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Bootstrapping the etcd Cluster

Kubernetes components are stateless and store cluster state in etcd. In this lab you will bootstrap a three node etcd cluster and configure it for high availability and secure remote access.

Prerequisites

The commands in this lab must be run on controller instance: master. Login to the controller instance:

ssh ubuntu@${MASTER_EXT_IP}

Bootstrapping an etcd Cluster Member

Download and Install the etcd Binaries

Download the official etcd release binaries from the coreos/etcd GitHub project:

wget -q --show-progress --https-only --timestamping \
  "https://github.com/coreos/etcd/releases/download/v3.3.4/etcd-v3.3.4-linux-amd64.tar.gz"

Extract and install the etcd server and the etcdctl command line utility:

tar xvf etcd-v3.3.4-linux-amd64.tar.gz

sudo mv etcd-v3.3.4-linux-amd64/etcd* /usr/local/bin/

Configure the etcd Server

sudo mkdir -p /etc/etcd /var/lib/etcd

sudo cp ca.pem kubernetes-key.pem kubernetes.pem /etc/etcd/

Back on local machine:

The instance internal IP address will be used to serve client requests and communicate with etcd cluster peers. Each etcd member must have a unique name within an etcd cluster. Set the etcd name to match the hostname of the current compute instance. In our case:

ETCD_NAME=master

Create the etcd.service systemd unit file:

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

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

[Install]
WantedBy=multi-user.target
EOF

Copy to master:

scp etcd.service ubuntu@${MASTER_EXT_IP}:~/

Start the etcd Server

On master node:

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

sudo systemctl daemon-reload

sudo systemctl enable etcd

sudo systemctl start etcd

Verification

List the etcd cluster members:

ETCDCTL_API=3 etcdctl member list

output

e8e1f8fc956bbd95, started, master, https://10.0.10.11:2380, https://10.0.10.11:2379

Next: Bootstrapping the Kubernetes Control Plane