Difference between revisions of "Package:Chrony"

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{{Ebuild
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|Summary=Chrony is a pair of programs (chronyd and chronyc) which are used to maintain the accuracy of the system clock on a computer. chronyd has been specifically written to work well for systems which have only an intermittent (e.g. dial-up) connection to the network where the NTP servers are. It still works well in a "permanently connected" mode.
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|CatPkg=net-misc/chrony
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|Homepage=http://chrony.tuxfamily.org/
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}}
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=== Accurate System Time (NTP) ===
 
=== Accurate System Time (NTP) ===
  
 
It's important that your Funtoo Linux system has an accurate clock. NTP (network time protocol) can ensure your clock is accurate at all time.
 
It's important that your Funtoo Linux system has an accurate clock. NTP (network time protocol) can ensure your clock is accurate at all time.
  
My favorite and recommended NTP client/server is '''{{Package|net-misc/chrony}}'''. It is recommended for Funtoo systems:
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The recommended NTP client/server is '''{{Package|net-misc/chrony}}'''.
  
<console>
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{{console|body=
 
###i## emerge chrony
 
###i## emerge chrony
 
###i## rc-update add chronyd default
 
###i## rc-update add chronyd default
</console>
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}}
  
Use something like the following for your <tt>/etc/chrony/chrony.conf</tt>:
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Use something like the following for your <code>/etc/chrony/chrony.conf</code>:
  
 
<pre>
 
<pre>
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</pre>
 
</pre>
  
Chronyd can then be started immediately by running <tt>rc</tt> to start all new services:
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Chronyd can then be started immediately by running <code>rc</code> to start all new services:
  
<console>
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{{console|body=
# ##i##rc
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###i## rc
</console>
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}}
  
Because Funtoo Linux starts network daemons without waiting for an Internet connection to become available, and because chrony will attempt to synchronize the clock over the Internet when it first starts, you must manually configure chronyd to be dependent on whatever method you use to enable your outbound network connectivity. For example, if using <tt>dhcpcd</tt>, add the following to <tt>/etc/conf.d/chronyd</tt>:
+
Because Funtoo Linux starts network daemons without waiting for an Internet connection to become available, and because chrony will attempt to synchronize the clock over the Internet when it first starts, you must manually configure chronyd to be dependent on whatever method you use to enable your outbound network connectivity. For example, if using <code>dhcpcd</code>, add the following to <code>/etc/conf.d/chronyd</code>:
  
 
<pre>
 
<pre>
Line 43: Line 49:
 
</pre>
 
</pre>
  
You should notice a marked improvement in your system clock's accuracy. If your system time was off by a significant amount, <tt>chronyd</tt> will gradually correct your clock while the system runs.
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You should notice a marked improvement in your system clock's accuracy. If your system time was off by a significant amount, <code>chronyd</code> will gradually correct your clock while the system runs.
 +
 
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==== Hardware Clock ====
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To write your NTP sync time to the hardware at shutdown, and read hw clock at start.
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 +
{{console|body=
 +
###i## echo 'clock_hctosys="YES"' >> /etc/conf.d/hwclock
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###i## echo 'clock_systohc="YES"' >> /etc/conf.d/hwclock
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###i## rc-service hwclock restart
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###i## rc-update add hwclock boot
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}}
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[[Category:System]]
 
[[Category:System]]
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[[Category:Official Documentation]]
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{{EbuildFooter}}

Latest revision as of 19:12, May 20, 2015

net-misc/chrony


Source Repository:Gentoo Portage Tree
Homepage

Summary: Chrony is a pair of programs (chronyd and chronyc) which are used to maintain the accuracy of the system clock on a computer. chronyd has been specifically written to work well for systems which have only an intermittent (e.g. dial-up) connection to the network where the NTP servers are. It still works well in a "permanently connected" mode.

Use Flags

cmdmon
Support for command and monitoring
ntp
Support for the Network Time Protocol (NTP)
phc
Support for the PTP (Precision Time Protocol) Hardware Clock (PHC) interface
pps
Support for the Linux Real Time Clock (RTC) interface
refclock
Support for reference clocks
rtc
Support for the Linux Real Time Clock interface
adns
Support for asynchronous DNS

News

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Chrony

Tip

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Accurate System Time (NTP)

It's important that your Funtoo Linux system has an accurate clock. NTP (network time protocol) can ensure your clock is accurate at all time.

The recommended NTP client/server is Chrony.

# emerge chrony
# rc-update add chronyd default


Use something like the following for your /etc/chrony/chrony.conf:

server time.apple.com
maxupdateskew 100
driftfile /etc/chrony/chrony.drift
keyfile /etc/chrony/chrony.keys
commandkey 1
dumponexit
dumpdir /var/log/chrony
initstepslew 10 time.apple.com
logdir /var/log/chrony
log measurements statistics tracking
logchange 0.5
mailonchange me@emailprovider.com 0.5
rtcfile /etc/chrony/chrony.rtc
rtconutc
sched_priority 1
lock_all

Chronyd can then be started immediately by running rc to start all new services:

# rc


Because Funtoo Linux starts network daemons without waiting for an Internet connection to become available, and because chrony will attempt to synchronize the clock over the Internet when it first starts, you must manually configure chronyd to be dependent on whatever method you use to enable your outbound network connectivity. For example, if using dhcpcd, add the following to /etc/conf.d/chronyd:

rc_need=dhcpcd

You should notice a marked improvement in your system clock's accuracy. If your system time was off by a significant amount, chronyd will gradually correct your clock while the system runs.

Hardware Clock

To write your NTP sync time to the hardware at shutdown, and read hw clock at start.

# echo 'clock_hctosys="YES"' >> /etc/conf.d/hwclock
# echo 'clock_systohc="YES"' >> /etc/conf.d/hwclock
# rc-service hwclock restart
# rc-update add hwclock boot