NTP\u30b5\u30fc\u30d0\u30fc(chrony)<\/p>\n
CentOS7 \u306e\u6642\u523b\u540c\u671f\u306b\u95a2\u3057\u3066\u306f\u3001\u4eca\u307e\u3067\u4f7f\u308f\u308c\u3066\u304d\u305f\uff62ntpd\uff63\u306b\u4ee3\u308f\u3063\u3066\uff62chronyd\uff63\u304c\u6a19\u6e96\u3068\u306a\u3063\u305f\u3002<\/p>\n
\u25a0NTP\u30b5\u30fc\u30d0\u30fc\u505c\u6b62
\n\u4eca\u307e\u3067\u4f7f\u308f\u308c\u3066\u304d\u305f\uff62ntpd\uff63\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u505c\u6b62\u3059\u308b\u3002<\/p>\n
[root@server1 ~]# systemctl stop ntpd\r\n[root@server1 ~]# systemctl disable ntpd\r\nrm '\/etc\/systemd\/system\/multi-user.target.wants\/ntpd.service'\r\n[root@server1 ~]# systemctl list-unit-files -t service | grep ntpd\r\nntpd.service disabled\r\nntpdate.service disabled<\/pre>\n\u25a0Chrony\u30b5\u30fc\u30d0\u30fc\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb
\n\u3059\u3067\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u308b\u306f\u305a\u3060\u304c\u3001\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070yum\u3067\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3002<\/p>\n[root@server1 ~]# yum -y install chrony\r\n\u8aad\u307f\u8fbc\u3093\u3060\u30d7\u30e9\u30b0\u30a4\u30f3:fastestmirror, langpacks, priorities\r\nLoading mirror speeds from cached hostfile\r\n * base: ftp.riken.jp\r\n * centosplus: ftp.riken.jp\r\n * extras: mirror.nus.edu.sg\r\n * updates: mirror.nus.edu.sg\r\n\u30d1\u30c3\u30b1\u30fc\u30b8 chrony-1.29.1-1.el7.centos.x86_64 \u306f\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u6e08\u307f\u304b\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3059\r\n\u4f55\u3082\u3057\u307e\u305b\u3093<\/pre>\n\u25a0Chrony\u30b5\u30fc\u30d0\u30fc\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u7de8\u96c6<\/p>\n
[root@server1 ~]# vi \/etc\/chrony.conf\r\n# Use public servers from the pool.ntp.org project.\r\n# Please consider joining the pool (http:\/\/www.pool.ntp.org\/join.html).\r\n#server 0.centos.pool.ntp.org iburst\u3000\u2190\u3000#\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\r\n#server 1.centos.pool.ntp.org iburst\u3000\u2190\u3000#\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\r\n#server 2.centos.pool.ntp.org iburst\u3000\u2190\u3000#\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\r\n#server 3.centos.pool.ntp.org iburst\u3000\u2190\u3000#\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\r\nserver ntp1.plala.or.jp\u3000\u2190\u3000server \u306b\u306f\u3001\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306eNTP\u30b5\u30fc\u30d0\u30fc\u3092\u8ffd\u52a0\r\nserver ntp2.plala.or.jp\u3000\u2190\u3000\u30bb\u30ab\u30f3\u30c0\u30ea\u306eNTP\u30b5\u30fc\u30d0\u30fc\u3082\u8ffd\u52a0\r\n\r\n# Ignore stratum in source selection.\r\nstratumweight 0\r\n\r\n# Record the rate at which the system clock gains\/losses time.\r\ndriftfile \/var\/lib\/chrony\/drift\r\n\r\n# Enable kernel RTC synchronization.\r\nrtcsync\r\n\r\n# In first three updates step the system clock instead of slew\r\n# if the adjustment is larger than 10 seconds.\r\nmakestep 10 3\r\n\r\n# Allow NTP client access from local network.\r\n#allow 192.168\/16\r\nallow 192.168.1.0\/24\u3000\u2190\u3000\u5185\u90e8\u304b\u3089\u306e\u30a2\u30af\u30bb\u30b9\u8a31\u53ef\r\n\r\n# Listen for commands only on localhost.\r\nbindcmdaddress 127.0.0.1\r\nbindcmdaddress ::1\r\n\r\n# Serve time even if not synchronized to any NTP server.\r\n#local stratum 10\r\n\r\nkeyfile \/etc\/chrony.keys\r\n\r\n# Specify the key used as password for chronyc.\r\ncommandkey 1\r\n\r\n# Generate command key if missing.\r\ngeneratecommandkey\r\n\r\n# Disable logging of client accesses.\r\nnoclientlog\r\n\r\n# Send a message to syslog if a clock adjustment is larger than 0.5 seconds.\r\nlogchange 0.5\r\n\r\nlogdir \/var\/log\/chrony\r\n#log measurements statistics tracking<\/pre>\n\u25a0Chrony\u30b5\u30fc\u30d0\u30fc\u306e\u8d77\u52d5
\n\u3044\u3063\u305f\u3093\u3001\u624b\u52d5\u3067NTP\u30b5\u30fc\u30d0\u306e\u6642\u523b\u3068\u540c\u671f\u3055\u305b\u308b\u3002<\/p>\n[root@server1 ~]# ntpdate ntp1.plala.or.jp\r\n21 Dec 07:32:01 ntpdate[2323]: no server suitable for synchronization found<\/pre>\n\u25a0Chrony\u30b5\u30fc\u30d0\u30fc\u518d\u8d77\u52d5<\/p>\n
[root@server1 ~]# systemctl restart chronyd<\/pre>\n\u25a0Chrony\u30b5\u30fc\u30d0\u30fc\u81ea\u52d5\u8d77\u52d5\u8a2d\u5b9a<\/p>\n
[root@server1 ~]# systemctl enable chronyd\r\n[root@server1 ~]# systemctl list-unit-files -t service | grep chronyd\r\nchronyd.service enabled<\/pre>\n\u25a0Chrony\u30b5\u30fc\u30d0\u30fc\u306e\u52d5\u4f5c\u78ba\u8a8d\u3002<\/p>\n
[root@server1 ~]# chronyc sources\r\n210 Number of sources = 2\r\nMS Name\/IP address Stratum Poll Reach LastRx Last sample\r\n===============================================================================\r\n^? ntp1.plala.or.jp 0 6 0 10y +0ns[ +0ns] +\/- 0ns\r\n^? ntp2.plala.or.jp 0 6 0 10y +0ns[ +0ns] +\/- 0ns<\/pre>\n\u25a0\u7d0415\u5206\u5f8c\u3001\u518d\u5ea6Chrony\u30b5\u30fc\u30d0\u30fc\u306e\u52d5\u4f5c\u78ba\u8a8d\u3002<\/p>\n
[root@server1 ~]# chronyc sources\r\n210 Number of sources = 2\r\nMS Name\/IP address Stratum Poll Reach LastRx Last sample\r\n===============================================================================\r\n^+ ntp1.plala.or.jp 4 6 7 0 -198us[ -20ms] +\/- 103ms\r\n^* ntp2.plala.or.jp 4 6 7 0 +56us[ -20ms] +\/- 103ms\r\n\u6307\u5b9a\u3057\u305fNTP\u30b5\u30fc\u30d0\u306e\u524d\u306b*\u3084+\u304c\u8868\u793a\u3055\u308c\u305f\u6642\u306f\u540c\u671f\u5b8c\u4e86\u306e\u72b6\u614b\u3002<\/pre>\n","protected":false},"excerpt":{"rendered":"NTP\u30b5\u30fc\u30d0\u30fc(chrony) CentOS7 \u306e\u6642\u523b\u540c\u671f\u306b\u95a2\u3057\u3066\u306f\u3001\u4eca\u307e\u3067\u4f7f\u308f … \u7d9a\u304d\u3092\u8aad\u3080