serviceman/installer/dist/etc/systemd/system/_name_.service.tmpl

# Pre-req
# sudo mkdir -p {{ .Local }}/opt/{{ .Name }}/ {{ .Local }}/var/log/{{ .Name }}
{{ if .System -}}
{{- if and .User ( ne "root" .User ) -}}
# sudo adduser {{ .User }} --home /opt/{{ .Name }}
# sudo chown -R {{ .User }}:{{ .Group }} /opt/{{ .Name }}/ /var/log/{{ .Name }}
{{- end }}
{{ end -}}
# Post-install
# sudo systemctl {{ if not .System -}} --user {{ end -}} daemon-reload
# sudo systemctl {{ if not .System -}} --user {{ end -}} restart {{ .Name }}.service
# sudo journalctl {{ if not .System -}} --user {{ end -}} -xefu {{ .Name }}

[Unit]
Description={{ .Title }} - {{ .Desc }}
Documentation={{ .URL }}
{{ if .System -}}
After=network-online.target
Wants=network-online.target systemd-networkd-wait-online.service
{{- end }}

[Service]
# Restart on crash (bad signal), but not on 'clean' failure (error exit code)
# Allow up to 3 restarts within 10 seconds
# (it's unlikely that a user or properly-running script will do this)
Restart=on-abnormal
StartLimitInterval=10
StartLimitBurst=3

{{ if .User -}}
# User and group the process will run as
User={{ .User }}
Group={{ .Group }}

{{ end -}}
{{ if .Workdir -}}
WorkingDirectory={{ .Workdir }}
{{ end -}}
ExecStart={{if .Interpreter }}{{ .Interpreter }} {{ end }}{{ .Exec }} {{- range $arg := .Argv }}{{ $arg }} {{- end }}
ExecReload=/bin/kill -USR1 $MAINPID

{{if .Production -}}
# Limit the number of file descriptors and processes; see `man systemd.exec` for more limit settings.
# These are reasonable defaults for a production system.
# Note: systemd "user units" do not support this
LimitNOFILE=1048576
LimitNPROC=64

{{ end -}}
{{if .MultiuserProtection -}}
# Use private /tmp and /var/tmp, which are discarded after the service stops.
PrivateTmp=true
# Use a minimal /dev
PrivateDevices=true
# Hide /home, /root, and /run/user. Nobody will steal your SSH-keys.
ProtectHome=true
# Make /usr, /boot, /etc and possibly some more folders read-only.
ProtectSystem=full
# ... except /opt/{{ .Name }} because we want a place for the database
# and /var/log/{{ .Name }} because we want a place where logs can go.
# This merely retains r/w access rights, it does not add any new.
# Must still be writable on the host!
ReadWriteDirectories=/opt/{{ .Name }} /var/log/{{ .Name }}

# Note: in v231 and above ReadWritePaths has been renamed to ReadWriteDirectories
; ReadWritePaths=/opt/{{ .Name }} /var/log/{{ .Name }}

{{ end -}}
{{if .PrivilegedPorts -}}
# The following additional security directives only work with systemd v229 or later.
# They further retrict privileges that can be gained by the service.
# Note that you may have to add capabilities required by any plugins in use.
CapabilityBoundingSet=CAP_NET_BIND_SERVICE
AmbientCapabilities=CAP_NET_BIND_SERVICE
NoNewPrivileges=true

# Caveat: Some features may need additional capabilities.
# For example an "upload" may need CAP_LEASE
; CapabilityBoundingSet=CAP_NET_BIND_SERVICE CAP_LEASE
; AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_LEASE
; NoNewPrivileges=true

{{ end -}}
[Install]
{{ if .System -}}
WantedBy=multi-user.target
{{- else -}}
WantedBy=default.target
{{- end }}