Rocky Linux 8にChrony(NTP時刻同期)をインストールする

OSバージョンの確認
[root@localhost ~]# cat /etc/redhat-release
Rocky Linux release 8.4 (Green Obsidian)

1.Chronyをインストール
[root@localhost ~]# dnf -y install chrony

2.Chronyの起動確認
自動起動を設定
[root@localhost ~]# systemctl enable –now chronyd
Chronyデーモンの起動状態の確認

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[root@localhost ~]# systemctl status chronyd
● chronyd.service - NTP client/server
Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2021-10-17 14:17:30 EDT; 6h left
[root@localhost ~]# systemctl status chronyd ● chronyd.service - NTP client/server Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled) Active: active (running) since Sun 2021-10-17 14:17:30 EDT; 6h left
[root@localhost ~]# systemctl status chronyd
● chronyd.service - NTP client/server
Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2021-10-17 14:17:30 EDT; 6h left

3.時刻同期の状況を確認

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[root@localhost ~]# chronyc sources
210 Number of sources = 4
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^- any.time.nl 2 9 353 159 -711us[ -711us] +/- 77ms
^- time.cloudflare.com 3 9 377 409 -5961us[-5742us] +/- 77ms
^* ntp-b2.nict.go.jp 1 9 377 283 +587us[ +810us] +/- 5048us
^- time.cloudflare.com 3 10 377 159 -5448us[-5448us] +/- 77ms
[root@localhost ~]# chronyc sources 210 Number of sources = 4 MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^- any.time.nl 2 9 353 159 -711us[ -711us] +/- 77ms ^- time.cloudflare.com 3 9 377 409 -5961us[-5742us] +/- 77ms ^* ntp-b2.nict.go.jp 1 9 377 283 +587us[ +810us] +/- 5048us ^- time.cloudflare.com 3 10 377 159 -5448us[-5448us] +/- 77ms
[root@localhost ~]# chronyc sources
210 Number of sources = 4
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^- any.time.nl                   2   9   353   159   -711us[ -711us] +/-   77ms
^- time.cloudflare.com           3   9   377   409  -5961us[-5742us] +/-   77ms
^* ntp-b2.nict.go.jp             1   9   377   283   +587us[ +810us] +/- 5048us
^- time.cloudflare.com           3  10   377   159  -5448us[-5448us] +/-   77ms

4.NTPサーバーの設定

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[root@localhost ~]# vi /etc/chrony.conf
23行目
修正前
#allow 192.168.0.0/16
修正後
allow 192.168.0.0/16
[root@localhost ~]# vi /etc/chrony.conf 23行目 修正前 #allow 192.168.0.0/16 修正後 allow 192.168.0.0/16
[root@localhost ~]# vi /etc/chrony.conf
23行目
修正前
#allow 192.168.0.0/16
修正後
allow 192.168.0.0/16

設定を反映
[root@localhost ~]# systemctl restart chronyd

5.ファイアウォールを有効
NTPクライアントからパケットを許可

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[root@localhost ~]# firewall-cmd --add-service=ntp --permanent
success
[root@localhost ~]# firewall-cmd --reload
success
[root@localhost ~]# firewall-cmd --add-service=ntp --permanent success [root@localhost ~]# firewall-cmd --reload success
[root@localhost ~]# firewall-cmd --add-service=ntp --permanent
success
[root@localhost ~]# firewall-cmd --reload
success

 

Rocky Linux 8

Posted by arkgame