[Unit]
Description=NTP client/server
After=network-online.target
ConditionCapability=CAP_SYS_TIME

[Service]
Type=forking
PIDFile=/run/chrony/chronyd.pid
ExecStartPre=/bin/mkdir -p /run/chrony
ExecStartPre=/bin/chown ntp:ntp /run/chrony
ExecStartPre=/bin/chmod 770 /run/chrony
ExecStart=/usr/sbin/chronyd -f /etc/chrony.conf
Restart=always
RestartSec=3

CapabilityBoundingSet=~CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_AUDIT_WRITE
CapabilityBoundingSet=~CAP_BLOCK_SUSPEND CAP_KILL CAP_LEASE CAP_LINUX_IMMUTABLE
CapabilityBoundingSet=~CAP_MAC_ADMIN CAP_MAC_OVERRIDE CAP_MKNOD CAP_SYS_ADMIN
CapabilityBoundingSet=~CAP_SYS_BOOT CAP_SYS_CHROOT CAP_SYS_MODULE CAP_SYS_PACCT
CapabilityBoundingSet=~CAP_SYS_PTRACE CAP_SYS_RAWIO CAP_SYS_TTY_CONFIG CAP_WAKE_ALARM
DeviceAllow=char-pps rw
DeviceAllow=char-ptp rw
DeviceAllow=char-rtc rw
DevicePolicy=closed
RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
SystemCallArchitectures=native
SystemCallFilter=~@cpu-emulation @debug @module @mount @obsolete @raw-io @reboot @swap

[Install]
WantedBy=multi-user.target

[X-Synology]
NameI18n=helptoc:ntp_service
Name=NTP service
FirewallSections=ntp
DefaultEnable=yes
InfoCenterDisplay=yes