After a centos update, varnish did not start anymore. We modified varnish.service and now it works.
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After a centos update, we could not get varnish 4 to work with the usual systemctl start varnish.
Here's a modification of /usr/lib/systemd/system/varnish.service that did the trick for us (We added: RemainAfterExit=yes and modified the type to Type=simple).
[Service]
# If you want to make changes to this file, please copy it to
# /etc/systemd/system/varnish.service and make your changes there.
# This will override the file kept at /lib/systemd/system/varnish.service
#
# Enviroment variables may be found in /etc/varnish/varnish.params
#
# Maximum number of open files (for ulimit -n)
LimitNOFILE=131072
# Locked shared memory (for ulimit -l)
# Default log size is 82MB + header
LimitMEMLOCK=82000
# On systemd >= 228 enable this to avoid "fork failed" on reload.
#TasksMax=infinity
# Maximum size of the corefile.
LimitCORE=infinity
EnvironmentFile=/etc/varnish/varnish.params
Type=simple
PIDFile=/var/run/varnish.pid
PrivateTmp=true
ExecStart=/usr/sbin/varnishd \
-P /var/run/varnish.pid \
-f $VARNISH_VCL_CONF \
-a ${VARNISH_LISTEN_ADDRESS}:${VARNISH_LISTEN_PORT} \
-T ${VARNISH_ADMIN_LISTEN_ADDRESS}:${VARNISH_ADMIN_LISTEN_PORT} \
-S $VARNISH_SECRET_FILE \
-u $VARNISH_USER -g $VARNISH_GROUP \
-s $VARNISH_STORAGE \
$DAEMON_OPTS
RemainAfterExit=yes
ExecReload=/usr/sbin/varnish_reload_vcl
[Install]
WantedBy=multi-user.target