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Home > 備忘録 > 時刻同期 > chrony のインストール( 66 )

Feora18に chrony をインストールすることに関する記録です。

chrony のインストール

  1. ネットワークアドレスを「192.168.64」と仮定する
  2. chrony のインストール
    3. [root@server]# yum install chrony
  3. /etc/chrony.conf の設定
    4. chrony.conf を編集する
    [root@server]# vi /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.fedora.pool.ntp.org iburst	←以下4行をコメントアウトする
#server 1.fedora.pool.ntp.org iburst
#server 2.fedora.pool.ntp.org iburst
#server 3.fedora.pool.ntp.org iburst

server ntp1.jst.mfeed.ad.jp	←ここにntpサーバーを追記する（3行追加）
server ntp2.jst.mfeed.ad.jp
server ntp3.jst.mfeed.ad.jp

# Ignore stratum in source selection.
stratumweight 0

# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift

# Enable kernel RTC synchronization.
rtcsync

# In first three updates step the system clock instead of slew
# if the adjustment is larger than 100 seconds.
makestep 100 3

# Allow client access from local network.
#allow 192.168/16
allow 192.168.64/24	←内部からの時刻同期を許可する範囲(追加)

# Serve time even if not synchronized to any NTP server.
#local stratum 10

keyfile /etc/chrony.keys

# Specify the key used as password for chronyc.
commandkey 1

# Disable logging of client accesses.
noclientlog

# Send a message to syslog if a clock adjustment is larger than 0.5 seconds.
logchange 0.5

logdir /var/log/chrony
#log measurements statistics tracking
  4. 手動による時刻合わせ
    5. [root@server]# ntpdate ntp1.jst.mfeed.ad.jp
20 Feb 10:48:51 ntpdate[10942]: adjust time server 210.173.160.27 offset -0.005203 sec
  5. chronyd の起動
    6. [root@server]# systemctl start chronyd.service
  6. chronyd の自動起動設定
    7. [root@server]# systemctl enable chronyd.service

動作確認

  1. systemctl status chronyd.service の実行
    2. [root@server]# systemctl status chronyd.service
chronyd.service - NTP client/server
	  Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled)
	  Active: active (running) since 木 2013-02-21 12:28:30 JST; 10min ago
	 Process: 3999 ExecStartPost=/usr/libexec/chrony-helper add-dhclient-servers (code=exited, status=0/SUCCESS)
	 Process: 3996 ExecStart=/usr/sbin/chronyd -u chrony $OPTIONS (code=exited, status=0/SUCCESS)
	 Process: 3988 ExecStartPre=/usr/libexec/chrony-helper generate-commandkey (code=exited, status=0/SUCCESS)
	Main PID: 3998 (chronyd)
	  CGroup: name=systemd:/system/chronyd.service
		  └─3998 /usr/sbin/chronyd -u chrony
	～～～～～以下省略～～～～～
  2. chronyc sources -v の実行
    3. ntpq -p に当たるものです
    [root@server]# chronyc sources -v
210 Number of sources = 3

  .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
 / .- Source state '*' = current synced, '+' = OK for sync, '?' = unreachable,
| /                'x' = time may be in error, '~' = time is too variable.
||                                                 .- xxxx [ yyyy ] +/- zzzz
||                                                /   xxxx = adjusted offset,
||         Log2(Polling interval) -.             |    yyyy = measured offset,
||                                  \            |    zzzz = estimated error.
||                                   |           |
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^+ ntp1.jst.mfeed.ad.jp          2   6     7    21  +4153us[  +51us] +/-   31ms
^+ ntp2.jst.mfeed.ad.jp          2   6     7    21  +3662us[ -440us] +/-   31ms
^* ntp3.jst.mfeed.ad.jp          2   6     7    21   -562us[-4664us] +/-   30ms
  3. chronyc tracking の実行
    4. [root@server]# chronyc tracking
	Reference ID    : 850BCC62 (ntp0.nc.u-tokyo.ac.jp)
Stratum         : 2
Ref time (UTC)  : Wed Apr 01 04:26:19 2026
System time     : 0.001139870 seconds fast of NTP time
Last offset     : +0.001427283 seconds
RMS offset      : 0.000811916 seconds
Frequency       : 2.917 ppm slow
Residual freq   : +0.011 ppm
Skew            : 0.124 ppm
Root delay      : 0.038363539 seconds
Root dispersion : 0.004379333 seconds
Update interval : 1025.4 seconds
Leap status     : Normal

chronyc のエラー(506 Cannot talk to daemon)

  1. 「506 Cannot talk to daemon」が出る
    2. [root@server]# chronyc tracking
506 Cannot talk to daemon
  2. /etc/chrony.conf に追加する
    3. [root@server]# vi /etc/chrony.conf
cmdallow 192.168.64/24		←cmdallow entry を追加