Creating new systemd service unit

proxyclient.service

# vi /etc/systemd/system/proxyclient.service

[Unit]
Description=Proxy Client
After=network.target

[Service]
Type=simple
ExecStart=/usr/sbin/proxy_client -s metro.basoro.id -p 4900 -k key
TimeoutStartSec=0

[Install]
WantedBy=default.target

# systemctl daemon-reload
# systemctl enable proxyclient.service
# systemctl start proxyclient.service
# systemctl reboot

rc-local.service

# vi /etc/systemd/system/rc-local.service

[Unit]
Description=/etc/rc.local Compatibility
ConditionPathExists=/etc/rc.local

[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
StandardOutput=tty
RemainAfterExit=yes
SysVStartPriority=99

[Install]
WantedBy=multi-user.target

# printf '%s\n' '#!/bin/bash' 'exit 0' | tee -a /etc/rc.local
# chmod +x /etc/rc.local
# systemctl enable rc-local
# systemctl start rc-local.service
# systemctl status rc-local.service