cert-renewer@.service

[Unit]
Description=Certificate renewer for %I
After=network-online.target
Documentation=https://smallstep.com/docs/step-ca/certificate-authority-server-production
StartLimitIntervalSec=0

[Service]
Type=oneshot
User=root

Environment=STEPPATH=/etc/step-ca \
            CERT_LOCATION=/etc/step/certs/%i.crt \
            KEY_LOCATION=/etc/step/certs/%i.key

; ExecCondition checks if the certificate is ready for renewal,
; based on the exit status of the command.
; (In systemd 242 or below, you can use ExecStartPre= here.)
ExecCondition=/usr/bin/step certificate needs-renewal ${CERT_LOCATION}

; ExecStart renews the certificate, if ExecStartPre was successful.
ExecStart=/usr/bin/step ca renew --force ${CERT_LOCATION} ${KEY_LOCATION}

; Try to reload or restart the systemd service that relies on this cert-renewer
; If the relying service doesn't exist, forge ahead.
ExecStartPost=/usr/bin/env bash -c "if ! systemctl --quiet is-enabled %i.service ; then exit 0; fi; systemctl try-reload-or-restart %i"

[Install]
WantedBy=multi-user.target