01.03. Installation Etcd service on app-etcd

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https://computingforgeeks.com/how-to-install-etcd-on-rhel-centos-rocky-almalinux/

1. Installation etcd

[root]# 

ETCD_RELEASE=$(curl -s https://api.github.com/repos/etcd-io/etcd/releases/latest|grep tag_name | cut -d '"' -f 4)

echo $ETCD_RELEASE

wget https://github.com/etcd-io/etcd/releases/download/${ETCD_RELEASE}/etcd-${ETCD_RELEASE}-linux-amd64.tar.gz

tar xvf etcd-${ETCD_RELEASE}-linux-amd64.tar.gz

cd etcd-${ETCD_RELEASE}-linux-amd64

mv etcd* /usr/local/bin

2. Check version

[root]# 

etcd --version

3. Environment

[root]# 

mkdir -p /var/lib/etcd/

mkdir /etc/etcd

groupadd --system etcd

useradd -s /sbin/nologin --system -g etcd etcd

chown -R etcd:etcd /var/lib/etcd/

chmod 0775 /var/lib/etcd/

4. Create service

[root]# vi /etc/systemd/system/etcd.service

[Unit]

Description=etcd key-value store

Documentation=https://github.com/etcd-io/etcd

After=network.target

[Service]

User=etcd

Type=notify

Environment=ETCD_DATA_DIR=/var/lib/etcd

Environment=ETCD_NAME=%m

ExecStart=/usr/local/bin/etcd

Restart=always

RestartSec=10s

LimitNOFILE=40000

[Install]

WantedBy=multi-user.target

5. Change configuration
[root]# vi /etc/etcd/etcd.conf

#[Member]

ETCD_DATA_DIR="/var/lib/etcd"

ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"

ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"

ETCD_NAME="default"

ETCD_HEARTBEAT_INTERVAL="1000"

ETCD_ELECTION_TIMEOUT="5000"

#[Clustering]

ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.1.85:2380"

ETCD_ADVERTISE_CLIENT_URLS="http://192.168.1.85:2379"

ETCD_INITIAL_CLUSTER="default=http://192.168.1.85:2380"

ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"

ETCD_INITIAL_CLUSTER_STATE="new"

6. Startup service and check
[root]# 

systemctl daemon-reload

systemctl enable etcd

systemctl start etcd
systemctl status etcd -l

7. Additional commands
[root]# etcdctl set /message "Hello World"

Hello World

[root]# etcdctl get /message

Hello World

[root]# etcdctl cluster-health

member a67a46e7ef0c58e0 is healthy: got healthy result from http://192.168.1.65:2379

cluster is healthy

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