Inicializando Cluster ETCD
Os componentes do Kubernetes não têm estado e armazenam o estado do cluster no etcd. iniciaremos um cluster etcd de três nós que ficarão em alta disponibilidade e acesso remoto seguro.
Pre Requisitos
Os comandos devem ser executados em cada controller: controlador-0, controlador-1 e controlador-2
for instance in controller-0 controller-1 controller-2; do
external_ip=$(aws ec2 describe-instances --filters \
"Name=tag:Name,Values=${instance}" \
"Name=instance-state-name,Values=running" \
--output text --query 'Reservations[].Instances[].PublicIpAddress')
echo ssh -i kubernetes.id_rsa ubuntu@$external_ip
done
Atenção: Abra 3 janelas novas de shell , se não tiver ambiente gráfico use o TMUX, ou faça uma por vez
Em cada janela nova execute um comando acima para se conectar ao controller-0, controller-1 e controller-2
Execute os comandos abaixo em cada uma das janelas ssh
wget -q --show-progress --https-only --timestamping \
"https://github.com/etcd-io/etcd/releases/download/v3.4.10/etcd-v3.4.10-linux-amd64.tar.gz"
sudo chmod +x etcd-v3.4.10-linux-amd64.tar.gz
tar -xvf etcd-v3.4.10-linux-amd64.tar.gz
sudo mv etcd-v3.4.10-linux-amd64/etcd* /usr/local/bin/
sudo mkdir -p /etc/etcd /var/lib/etcd
sudo chmod 700 /var/lib/etcd
sudo cp ca.pem kubernetes-key.pem kubernetes.pem /etc/etcd/
INTERNAL_IP=$(curl -s http://169.254.169.254/latest/meta-data/local-ipv4)
echo "$INTERNAL_IP"
ETCD_NAME=$(curl -s http://169.254.169.254/latest/user-data/ \
| tr "|" "\n" | grep "^name" | cut -d"=" -f2)
echo "${ETCD_NAME}"
Configurando ETCD Service
cat <<EOF | sudo tee /etc/systemd/system/etcd.service
[Unit]
Description=etcd
Documentation=https://github.com/coreos
[Service]
ExecStart=/usr/local/bin/etcd \\
--name ${ETCD_NAME} \\
--cert-file=/etc/etcd/kubernetes.pem \\
--key-file=/etc/etcd/kubernetes-key.pem \\
--peer-cert-file=/etc/etcd/kubernetes.pem \\
--peer-key-file=/etc/etcd/kubernetes-key.pem \\
--trusted-ca-file=/etc/etcd/ca.pem \\
--peer-trusted-ca-file=/etc/etcd/ca.pem \\
--peer-client-cert-auth \\
--client-cert-auth \\
--initial-advertise-peer-urls https://${INTERNAL_IP}:2380 \\
--listen-peer-urls https://${INTERNAL_IP}:2380 \\
--listen-client-urls https://${INTERNAL_IP}:2379,https://127.0.0.1:2379 \\
--advertise-client-urls https://${INTERNAL_IP}:2379 \\
--initial-cluster-token etcd-cluster-0 \\
--initial-cluster controller-0=https://10.0.1.10:2380,controller-1=https://10.0.1.11:2380,controller-2=https://10.0.1.12:2380 \\
--initial-cluster-state new \\
--data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
Inicializando ETCD Service
sudo systemctl daemon-reload sudo systemctl enable etcd sudo systemctl start etcd
Verificando ETCD Service
sudo ETCDCTL_API=3 etcdctl member list \ --endpoints=https://127.0.0.1:2379 \ --cacert=/etc/etcd/ca.pem \ --cert=/etc/etcd/kubernetes.pem \ --key=/etc/etcd/kubernetes-key.pem
Resultado Esperado
bbeedf10f5bbaa0c, started, controller-2, https://10.0.1.12:2380, https://10.0.1.12:2379, false f9b0e395cb8278dc, started, controller-0, https://10.0.1.10:2380, https://10.0.1.10:2379, false eecdfcb7e79fc5dd, started, controller-1, https://10.0.1.11:2380, https://10.0.1.11:2379, false