etcd2.service

# /usr/lib64/systemd/system/etcd2.service
[Unit]
Description=etcd2
Conflicts=etcd.service

[Service]
User=etcd
Environment=ETCD_DATA_DIR=/var/lib/etcd2
Environment=ETCD_NAME=%m
ExecStart=/usr/bin/etcd2
Restart=always
RestartSec=10s
LimitNOFILE=40000

# /run/systemd/system/etcd2.service.d/20-cloudinit.conf
[Service]
Environment="ETCD_ADVERTISE_CLIENT_URLS=http://172.17.8.101:2379"
Environment="ETCD_DISCOVERY=https://discovery.etcd.io/c7b23efaed9a353d69bef0aee1aceda9"
Environment="ETCD_INITIAL_ADVERTISE_PEER_URLS=http://172.17.8.101:2380"
Environment="ETCD_LISTEN_CLIENT_URLS=http://172.17.8.101:2379,http://127.0.0.1:2379"
Environment="ETCD_LISTEN_PEER_URLS=http://172.17.8.101:2380"