haproxy-1.8.8-1.el7.x86_64

# cat /usr/lib/systemd/system/haproxy.service
[Unit]
Description=HAProxy Load Balancer
After=network.target

[Service]
User=haproxy
LimitNOFILE=150000
Environment="CONFIG=/etc/haproxy/haproxy.cfg" "PIDFILE=/var/lib/haproxy/haproxy.pid"
ExecStartPre=/usr/sbin/haproxy -f $CONFIG -c -q
ExecStart=/usr/sbin/haproxy -Ws -f $CONFIG -p $PIDFILE
ExecReload=/usr/sbin/haproxy -f $CONFIG -c -q
ExecReload=/bin/kill -USR2 $MAINPID
KillMode=mixed
Restart=always
Type=notify

[Install]
WantedBy=multi-user.target