infra/roles/caddy/templates/caddy.service

{{ ansible_managed | comment(decoration="; ") }}
; source: https://github.com/mholt/caddy/blob/master/dist/init/linux-systemd/caddy.service
; version: 6be0386
; changes: Set variables via Ansible

[Unit]
Description=Caddy HTTP/2 web server
Documentation=https://caddyserver.com/docs
After=network-online.target
{% if caddy_systemd_network_dependency == true %}
Wants=network-online.target systemd-networkd-wait-online.service
{% endif %}
{% if caddy_systemd_version | int >= 230 %}
StartLimitIntervalSec={{ caddy_systemd_restart_startlimitinterval }}
StartLimitBurst={{ caddy_systemd_restart_startlimitburst }}
{% endif %}

[Service]
Restart={{ caddy_systemd_restart }}
{% if caddy_systemd_version | int < 230 %}
StartLimitInterval={{ caddy_systemd_restart_startlimitinterval }}
StartLimitBurst={{ caddy_systemd_restart_startlimitburst }}
{% endif %}

; User and group the process will run as.
User={{ caddy_user }}
Group={{ caddy_user }}

; Letsencrypt-issued certificates will be written to this directory.
Environment=CADDYPATH={{ caddy_certs_dir }}

ExecStart="{{ caddy_bin_dir }}/caddy" run --environ --config "{{ caddy_conf_dir }}/Caddyfile" {{ caddy_additional_args }}
ExecReload="{{ caddy_bin_dir }}/caddy" reload --config "{{ caddy_conf_dir }}/Caddyfile"

; Limit the number of file descriptors; see `man systemd.exec` for more limit settings.
LimitNOFILE=1048576
{% if caddy_systemd_nproc_limit > 0 %}
; Limit the number of caddy threads.
LimitNPROC={{ caddy_systemd_nproc_limit }}
{% endif %}

; Use private /tmp and /var/tmp, which are discarded after caddy stops.
PrivateTmp={{ caddy_systemd_private_tmp }}
; Use a minimal /dev
PrivateDevices={{ caddy_systemd_private_devices }}
; Hide /home, /root, and /run/user. Nobody will steal your SSH-keys.
ProtectHome={{ caddy_systemd_protect_home }}
; Make /usr, /boot, /etc and possibly some more folders read-only.
ProtectSystem={{ caddy_systemd_protect_system }}
; … except {{ caddy_certs_dir }}, because we want Letsencrypt-certificates there.
;   This merely retains r/w access rights, it does not add any new. Must still be writable on the host!
ReadWriteDirectories={{ caddy_certs_dir }}

{% if caddy_systemd_capabilities_enabled %}
; The following additional security directives only work with systemd v229 or later.
; They further retrict privileges that can be gained by caddy.
; Note that you may have to add capabilities required by any plugins in use.
CapabilityBoundingSet={{ caddy_systemd_capabilities }}
AmbientCapabilities={{ caddy_systemd_capabilities }}
NoNewPrivileges=true

{% endif %}
{% if caddy_environment_variables|length %}

; Additional environment variables:

{% for key, value in caddy_environment_variables.items() %}
Environment={{ key }}={{ value }}
{% endfor %}

{% endif %}
[Install]
WantedBy=multi-user.target