systemd service unit example (#257)

* systemd service unit example

* typo

* inconsistent use of sudo

Author: ststefa

scripts/systemd/nym-mixnode.service

@@ -0,0 +1,49 @@
+# This is an example systemd service unit illustrating how to make a mixnode
+# start and stop automatically on a Linux box which runs on systemd.
+# To determine if it is applicable to your system simply run "ps 1". If the
+# output mentions "systemd" then you're good to go.
+#
+# Systemd has pretty sophisticated features to tweak the service runtime
+# behavior. If you want to explore them you can start with the official docs:
+#    https://www.freedesktop.org/software/systemd/man/systemd.service.html
+#    https://www.freedesktop.org/software/systemd/man/systemd.exec.html
+# However keep in mind that more often than not the defaults work very well.
+#
+# Directions of use (description and example command)
+# 1. Create a "nym" user and group (example for Debian):
+#    sudo useradd -U -m -s /sbin/nologin nym
+# 2. Start a new bash session with your nym user:
+#    sudo -u nym bash
+# 3. Change to the users home directory:
+#    cd
+# 4. Obtain the current mixnode binary from the nym release page and make it
+#    executable:
+#    curl -LO https://github.com/nymtech/nym/releases/download/v0.7.0/nym-mixnode_linux_x86_64
+#    chmod 755 nym-mixnode_linux_x86_64
+# 6. Initialize the mixnode config (this assumes a simple IPv4 setup):
+#    ./nym-mixnode_linux_x86_64 init --id iamboss -layer 2 --host $(curl -sS v4.icanhazip.com)
+# 7. Give it a try. The mixnode should run in the foreground until you
+#    terminate it with Ctrl-C:
+#    ./nym-mixnode_linux_x86_64 run --id iamboss
+# 8. Exit from your nym shell:
+#    exit
+# 9. Copy this file over to /etc/systemd/system/nym-mixnode.service.
+# 4. Enable the service so that it will autostart at boot-time:
+#    sudo systemctl enable nym-mixnode
+# 3. Start the nym service:
+#    sudo systemctl start nym-mixnode
+
+[Unit]
+Description=nym mixnode service
+After=network.target
+
+[Service]
+Type=simple
+User=nym
+Group=nym
+WorkingDirectory=/home/nym
+ExecStart=/home/nym/nym-mixnode_linux_x86_64 run --id iamboss
+Restart=on-abort
+
+[Install]
+WantedBy=multi-user.target