Provide example systemd service unit files for redis-server

utils/systemd-redis_multiple_servers@.service

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+# example systemd template service unit file for multiple redis-servers
+#
+# You can use this file as a blueprint for your actual template service unit
+# file, if you intend to run multiple independent redis-server instances in
+# parallel using systemd's "template unit files" feature. If you do, you will
+# want to choose a better basename for your service unit by renaming this file
+# when copying it.
+#
+# Please take a look at the provided "systemd-redis_server.service" example
+# service unit file, too, if you choose to use this approach at managing
+# multiple redis-server instances via systemd.
+
+[Unit]
+Description=Redis data structure server - instance %i
+Documentation=https://redis.io/documentation
+# This template unit assumes your redis-server configuration file(s)
+# to live at /etc/redis/redis_server_<INSTANCE_NAME>.conf
+AssertPathExists=/etc/redis/redis_server_%i.conf
+#Before=your_application.service another_example_application.service
+#AssertPathExists=/var/lib/redis
+
+[Service]
+ExecStart=/usr/local/bin/redis-server /etc/redis/redis_server_%i.conf
+LimitNOFILE=10032
+NoNewPrivileges=yes
+#OOMScoreAdjust=-900
+#PrivateTmp=yes
+Type=notify
+TimeoutStartSec=infinity
+TimeoutStopSec=infinity
+UMask=0077
+#User=redis
+#Group=redis
+#WorkingDirectory=/var/lib/redis
+
+[Install]
+WantedBy=multi-user.target

utils/systemd-redis_server.service

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+# example systemd service unit file for redis-server
+#
+# In order to use this as a template for providing a redis service in your
+# environment, _at the very least_ make sure to adapt the redis configuration
+# file you intend to use as needed (make sure to set "supervised systemd"), and
+# to set sane TimeoutStartSec and TimeoutStopSec property values in the unit's
+# "[Service]" section to fit your needs.
+#
+# Some properties, such as User= and Group=, are highly desirable for virtually
+# all deployments of redis, but cannot be provided in a manner that fits all
+# expectable environments. Some of these properties have been commented out in
+# this example service unit file, but you are highly encouraged to set them to
+# fit your needs.
+#
+# Please refer to systemd.unit(5), systemd.service(5), and systemd.exec(5) for
+# more information.
+
+[Unit]
+Description=Redis data structure server
+Documentation=https://redis.io/documentation
+#Before=your_application.service another_example_application.service
+#AssertPathExists=/var/lib/redis
+
+[Service]
+ExecStart=/usr/local/bin/redis-server --supervised systemd --daemonize no
+## Alternatively, have redis-server load a configuration file:
+#ExecStart=/usr/local/bin/redis-server /path/to/your/redis.conf
+LimitNOFILE=10032
+NoNewPrivileges=yes
+#OOMScoreAdjust=-900
+#PrivateTmp=yes
+Type=notify
+TimeoutStartSec=infinity
+TimeoutStopSec=infinity
+UMask=0077
+#User=redis
+#Group=redis
+#WorkingDirectory=/var/lib/redis
+
+[Install]
+WantedBy=multi-user.target