chrony is an alternative to ntpd. In particular it may be useful for quasi-realtime embedded systems that have a pulse-per-second time reference available and need to rapidly synchronize to it after boot, which appears to be unachievable with ntpd.
Signed-off-by: Henry Hallam <[email protected]> --- .../recipes-support/chrony/chrony/chrony.conf | 40 +++++++++++ .../recipes-support/chrony/chrony/chronyd | 58 +++++++++++++++ .../recipes-support/chrony/chrony_2.4.bb | 83 ++++++++++++++++++++++ 3 files changed, 181 insertions(+) create mode 100644 meta-networking/recipes-support/chrony/chrony/chrony.conf create mode 100644 meta-networking/recipes-support/chrony/chrony/chronyd create mode 100644 meta-networking/recipes-support/chrony/chrony_2.4.bb diff --git a/meta-networking/recipes-support/chrony/chrony/chrony.conf b/meta-networking/recipes-support/chrony/chrony/chrony.conf new file mode 100644 index 0000000..435a4f9 --- /dev/null +++ b/meta-networking/recipes-support/chrony/chrony/chrony.conf @@ -0,0 +1,40 @@ +# Use public NTP servers from the pool.ntp.org project. +pool pool.ntp.org iburst + +# Use a local timeserver in preference to the pool, if it's reachable. +#server 192.168.22.22 iburst minpoll 2 prefer + +# Sync to pulse-per-second from an onboard GPS. +# refclock PPS /dev/pps0 poll 0 prefer +# You'll want to enable CONFIG_PPS and CONFIG_PPS_CLIENT_GPIO in your kernel, +# and an entry something like this in your device tree: +# pps { +# compatible = "pps-gpio"; +# gpios = <&ps7_gpio_0 56 0>; +# }; + +# Record the rate at which the system clock gains/loses time, +# improving accuracy after reboot +driftfile /var/lib/chrony.drift + +# In first three updates step the system clock instead of slew +# if the adjustment is larger than 1 second. +makestep 1.0 3 + +# Enable kernel synchronization of the real-time clock (RTC). +#rtcsync + +# Allow NTP client access from local network. +#allow 192.168/16 + +# Serve time even if not synchronized to any NTP server. +#local stratum 10 + +# Specify file containing keys for NTP authentication. +#keyfile /etc/chrony.keys + +# Specify directory for log files. +logdir /var/log/chrony + +# Select which information is logged. +#log measurements statistics tracking diff --git a/meta-networking/recipes-support/chrony/chrony/chronyd b/meta-networking/recipes-support/chrony/chrony/chronyd new file mode 100644 index 0000000..04f1b68 --- /dev/null +++ b/meta-networking/recipes-support/chrony/chrony/chronyd @@ -0,0 +1,58 @@ +#! /bin/sh + +# System V init script for chrony +# Adapted from the script already in meta-networking for ntpd + +### BEGIN INIT INFO +# Provides: chrony +# Required-Start: $network $remote_fs $syslog +# Required-Stop: $network $remote_fs $syslog +# Default-Start: 2 3 4 5 +# Default-Stop: +# Short-Description: Start chrony time daemon +### END INIT INFO + +PATH=/sbin:/bin:/usr/bin:/usr/sbin + +DAEMON=/usr/sbin/chronyd +PIDFILE=/var/run/chronyd.pid + +test -x $DAEMON -a -r /etc/chrony.conf || exit 0 + +# Source function library. +. /etc/init.d/functions + +# Functions to do individual actions +startdaemon(){ + echo -n "Starting chronyd: " + start-stop-daemon --start --quiet --oknodo --pidfile $PIDFILE --startas $DAEMON -- "$@" + echo "done" +} +stopdaemon(){ + echo -n "Stopping chronyd: " + start-stop-daemon --stop --quiet --oknodo -p $PIDFILE + echo "done" +} + +case "$1" in + start) + startdaemon + ;; + stop) + stopdaemon + ;; + force-reload | restart | reload) + stopdaemon + startdaemon + ;; + status) + status /usr/sbin/chronyd; + exit $? + ;; + *) + echo "Usage: chronyd { start | stop | status | restart | reload }" >&2 + exit 1 + ;; +esac + +exit 0 diff --git a/meta-networking/recipes-support/chrony/chrony_2.4.bb b/meta-networking/recipes-support/chrony/chrony_2.4.bb new file mode 100644 index 0000000..2b6ae5b --- /dev/null +++ b/meta-networking/recipes-support/chrony/chrony_2.4.bb @@ -0,0 +1,83 @@ +SUMMARY = "Versatile implementation of the Network Time Protocol" +DESCRIPTION = "Chrony can synchronize the system clock with NTP \ +servers, reference clocks (e.g. GPS receiver), and manual input using \ +wristwatch and keyboard. It can also operate as an NTPv4 (RFC 5905) \ +server and peer to provide a time service to other computers in the \ +network. \ +\ +It is designed to perform well in a wide range of conditions, \ +including intermittent network connections, heavily congested \ +networks, changing temperatures (ordinary computer clocks are \ +sensitive to temperature), and systems that do not run continuosly, or \ +run on a virtual machine. \ +\ +Typical accuracy between two machines on a LAN is in tens, or a few \ +hundreds, of microseconds; over the Internet, accuracy is typically \ +within a few milliseconds. With a good hardware reference clock \ +sub-microsecond accuracy is possible. \ +\ +Two programs are included in chrony: chronyd is a daemon that can be \ +started at boot time and chronyc is a command-line interface program \ +which can be used to monitor chronyd's performance and to change \ +various operating parameters whilst it is running." + +HOMEPAGE = "http://chrony.tuxfamily.org/"; +SECTION = "net" +LICENSE = "GPLv2" +LIC_FILES_CHKSUM = "file://COPYING;md5=751419260aa954499f7abaabaa882bbe" + +DEPENDS = "libcap readline" +# It's probably a bad idea to run chrony and ntpd on the same system. +RCONFLICTS_${PN} = "ntp" + +SRC_URI = "https://download.tuxfamily.org/chrony/chrony-${PV}.tar.gz \ + file://chrony.conf \ + file://chronyd" + +SRC_URI[md5sum] = "d0598aa8a9be8faccef9386f6fc0d5f2" +SRC_URI[sha256sum] = "8d04e7cda2333289c2104b731d39c3c1db94816e43bae35d7ee4e7ae8af6391f" + +# Note: chrony does not use autotools, although it is built via './configure; make; make install'. +inherit update-rc.d systemd + +CONFFILES_${PN} = "${sysconfdir}/chrony.conf" + +INITSCRIPT_NAME = "chronyd" +INITSCRIPT_PARAMS = "defaults" + +SYSTEMD_PACKAGES = "${PN}" +SYSTEMD_SERVICE_${PN} = "chronyd.service" + +do_configure() { + ./configure --sysconfdir=${sysconfdir} --bindir=${bindir} --sbindir=${sbindir} --localstatedir=${localstatedir} --datarootdir=${datadir} +} + +do_compile() { + make ${PARALLEL_MAKE} +} + +do_install() { + # binaries + install -d ${D}${bindir} + install -m 0755 ${S}/chronyc ${D}${bindir} + install -d ${D}${sbindir} + install -m 0755 ${S}/chronyd ${D}${sbindir} + + # config files + install -d ${D}${sysconfdir} + install -m 644 ${WORKDIR}/chrony.conf ${D}${sysconfdir} + + # System V init scripts + install -d ${D}${sysconfdir}/init.d + install -m 755 ${WORKDIR}/chronyd ${D}${sysconfdir}/init.d + + # systemd unit + install -d ${D}${systemd_unitdir}/system + install -m 0644 ${S}/examples/chronyd.service ${D}${systemd_unitdir}/system/ + + # variable data (for drift file) + install -d ${D}${localstatedir}/lib/chrony + + # log files + install -d ${D}${localstatedir}/log/chrony +} -- 2.8.1 -- _______________________________________________ Openembedded-devel mailing list [email protected] http://lists.openembedded.org/mailman/listinfo/openembedded-devel
