1. Middleware 설치

Chrony

Chrony 설치

apt install chrony

Chrony Config 설징

Chrony는 Controller#1을 바라보며, Controller#1은 외부 NTP SERVER를 바라보게 구성하였음

삼중화 구성시 서버간 시간 동기화가 반드시 필요

Controller#1

vi /etc/chrony/chrony.conf

#기존 NTP Pool 주석처리 이후
...
server time.bora.net iburst
allow 192.168.0.0/0
...

Controller#2

vi /etc/chrony/chrony.conf

...
server 192.168.0.11 iburst
...

Controller#3

vi /etc/chrony/chrony.conf

...
server 192.168.0.11 iburst
...

Chrony 재기동

#모든 노드에서 진행
systemctl restart chrony

Chrony 상태 확인

chronyc sources -v

>> Controller#1
  .-- 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               10   6   377    50  -9489us[  -98ms] +/-  206ms


>> Controller#2,3
  .-- 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
===============================================================================
^* 192.168.0.11              10   6   377     3    +55ms[  +34ms] +/-  259ms

위와 같이 MS에 * 표시로 정상 동기화중임을 확인