Synapse-Ubuntu-ZFS/etc/systemd/system/certbot-ocsp-fetcher.service

[Unit]
Description=Fetch OCSP responses for all certificates issued with Certbot

[Service]
Type=oneshot

Restart=on-failure

CacheDirectory=%N

User=root
Group=root
ExecStart=%N --no-reload-webserver -o /var/cache/certbot-ocsp-fetcher
ExecStartPost=systemctl reload nginx.service

RestartSec=5
PrivateDevices=true
PrivateTmp=yes
PrivateUsers=yes
PrivateIPC=true

NoNewPrivileges=true
LockPersonality=true

CapabilityBoundingSet=
ProtectHome=yes
ProtectControlGroups=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectKernelLogs=true
ProtectClock=true
ProtectProc=invisible
ProcSubset=pid
ProtectHostname=true
RemoveIPC=true

RestrictAddressFamilies=AF_INET6 AF_INET AF_UNIX
MemoryDenyWriteExecute=true
RestrictRealtime=true
RestrictNamespaces=true
RestrictSUIDSGID=true

DevicePolicy=strict
DeviceAllow=/dev/random r
DeviceAllow=/dev/urandom r
DeviceAllow=/dev/stdin r
DeviceAllow=/dev/stdout r
DeviceAllow=/dev/null w

ProtectSystem=strict
InaccessiblePaths=/root/
ReadOnlyPaths=/etc/letsencrypt
UMask=0077

SystemCallArchitectures=native
SystemCallFilter=@system-service
SystemCallFilter=~@clock @debug @module @mount @reboot @swap @resources @cpu-emulation @raw-io @obsolete @keyring @privileged