On centos7 you can use systemd, just create unit like this:
/var/lib/systemd/system/arma3.service
[Unit]
Description=Arma3 exilemod server
After=syslog.target network.target
Conflicts=
[Service]
Type=simple
PIDFile=/tmp/arma3.pid
#ExecStartPost=/usr/bin/systemctl restart arma3_hc.service
WorkingDirectory=/home/steam/steamcmd/exile
ExecStart=/home/steam/steamcmd/exile/arma3server -config=config.cfg -mod=@exile -servermod="@exileserver;" -autoinit -cpuCount=2 -exThreads=2
User=steam
Restart=always
TimeoutSec=60
RestartSec=60
[Install]
WantedBy=multi-user.target
systemctl daemon-reload
systemctl start arma3
