[CentOS, Ubuntu] 시스템 시간 동기화 chrony

 

# [CentOS] chrony 설치 

# dnf install chrony

# systemctl status chronyd
● chronyd.service - NTP client/server
   Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)
   Active: active (running) since Sat 2024-03-02 16:36:03 KST; 15h ago
     Docs: man:chronyd(8)
           man:chrony.conf(5)
 Main PID: 4034 (chronyd)
    Tasks: 1 (limit: 24909)
   Memory: 1.6M
   CGroup: /system.slice/chronyd.service
           └─4034 /usr/sbin/chronyd

# systemctl enable chronyd

# 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).
#pool 2.centos.pool.ntp.org iburst
server time.bora.net iburst              <----- 추가
server send.mx.cdnetworks.com iburst     <----- 추가

# systemctl restart chronyd

# chronyc sources -v

  .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
 / .- Source state '*' = current best, '+' = combined, '-' = not combined,
| /             'x' = may be in error, '~' = too variable, '?' = unusable.
||                                                 .- xxxx [ yyyy ] +/- zzzz
||      Reachability register (octal) -.           |  xxxx = adjusted offset,
||      Log2(Polling interval) --.      |          |  yyyy = measured offset,
||                                \     |          |  zzzz = estimated error.
||                                 |    |           \
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* time.bora.net                 2   6   377    63   +816us[+1809us] +/-  648ms
^? i0-h0-s333.p28-nrt.cdngp>     0   8     0     -     +0ns[   +0ns] +/-    0ns

 

# [Ubuntu] Chrony 설치

# apt install chrony

# systemctl status chronyd
● chrony.service - chrony, an NTP client/server
     Loaded: loaded (/lib/systemd/system/chrony.service; enabled; vendor preset: enabled)
     Active: active (running) since Sun 2024-03-03 08:40:50 KST; 11s ago
       Docs: man:chronyd(8)
             man:chronyc(1)
             man:chrony.conf(5)
    Process: 10627 ExecStart=/usr/lib/systemd/scripts/chronyd-starter.sh $DAEMON_OPTS (code=exited, status=0/SUC>
   Main PID: 10637 (chronyd)
      Tasks: 2 (limit: 2219)
     Memory: 1.3M
        CPU: 97ms
     CGroup: /system.slice/chrony.service
             ├─10637 /usr/sbin/chronyd -F 1
             └─10638 /usr/sbin/chronyd -F 1

# systemctl enable chrony
Synchronizing state of chrony.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable chrony

# vi /etc/chrony/chrony.conf
# See http://www.pool.ntp.org/join.html for more information.
pool ntp.ubuntu.com        iburst maxsources 4
pool 0.ubuntu.pool.ntp.org iburst maxsources 1
pool 1.ubuntu.pool.ntp.org iburst maxsources 1
pool 2.ubuntu.pool.ntp.org iburst maxsources 2
server time.bora.net iburst                     <--- 추가
server send.mx.cdnetworks.com iburst            <--- 추가

# systemctl restart chronyd

# chronyc sources -v

  .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
 / .- Source state '*' = current best, '+' = combined, '-' = not combined,
| /             'x' = may be in error, '~' = too variable, '?' = unusable.
||                                                 .- xxxx [ yyyy ] +/- zzzz
||      Reachability register (octal) -.           |  xxxx = adjusted offset,
||      Log2(Polling interval) --.      |          |  yyyy = measured offset,
||                                \     |          |  zzzz = estimated error.
||                                 |    |           \
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^- prod-ntp-3.ntp4.ps5.cano>     2   6    17     6  -9258us[-9258us] +/-  143ms
^- alphyn.canonical.com          2   6    33     3    -11ms[  -11ms] +/-  133ms
^- prod-ntp-5.ntp1.ps5.cano>     2   6    17     6    -11ms[  -11ms] +/-  145ms
^- prod-ntp-4.ntp1.ps5.cano>     2   6    17     6  -7299us[-7299us] +/-  145ms
^- 121.174.142.81                3   6    17     7   -224us[ -224us] +/-   43ms
^* 106.247.248.106               2   6    17     7  +1773us[+5022us] +/-   28ms
^- ec2-13-209-84-50.ap-nort>     2   6    17     5  +1679us[+1679us] +/- 7298us
^+ time.bora.net                 3   6    17     5  -3772us[-3772us] +/-   56ms
^? i0-h0-s333.p28-nrt.cdngp>     0   7     0     -     +0ns[   +0ns] +/-    0ns