override

[Service]
ExecStart=
ExecStart=/opt/varnish/sbin/varnishd \
        -a http=:80 \
        -a tls=/shared/varnish_haproxy/varnish_proxy,PROXY,mode=777 \
        -p feature=+http2 \
        -p vcl_path=/etc/varnish:/opt/varnish/share/varnish/vcl \
        -f /etc/varnish/default.vcl -s malloc,256m
ExecReload=
ExecReload=/opt/varnish/sbin/varnishreload -m 3 -w 10

varnish.service

[Unit]
Description=Varnish Cache, a high-performance HTTP accelerator
After=network-online.target

[Service]
Type=forking
KillMode=process

# Maximum number of open files (for ulimit -n)
LimitNOFILE=131072

# Locked shared memory - should suffice to lock the shared memory log
# (varnishd -l argument)
# Default log size is 80MB vsl + 1M vsm + header -> 82MB
# unit is bytes
LimitMEMLOCK=85983232

# Enable this to avoid "fork failed" on reload.
TasksMax=infinity

# Maximum size of the corefile.
LimitCORE=infinity

ExecStart=/opt/varnish/sbin/varnishd -a :6081 -f /etc/varnish/default.vcl -s malloc,256m
ExecReload=/opt/varnish/sbin/varnishreload

[Install]
WantedBy=multi-user.target