Cumulus Linux 上的 Chrony

在运行 Cumulus Linux 4.3.0 的基于 ARM 的平台上，您可以使用 Chrony 作为时间提供程序。

要使用 Chrony，您需要

• 编辑 /etc/apt/sources.list 文件以允许上游存储库。
• 使用 apt 命令行实用程序从源更新本地索引。
• 使用 apt 命令行实用程序删除和 purge NTP。
• 安装 Chrony。
• 编辑系统配置以建立 Chrony 作为管理服务。
• 向 Chrony 配置添加低延迟时间源。

NVIDIA 已使用 Netq 4.2.0 (4.2.0-cl4u38~1652820696.25f4ac06) 和 chrony_3.4-4+deb10u2_armel.deb 验证了以下步骤。

1. 编辑 /etc/apt/sources.list 文件以允许上游存储库

   root@cumulus:mgmt:/home/cumulus# sudo vi /etc/apt/sources.list
   # Cumulus Linux package repository
   deb      http://apt.cumulusnetworks.com/repo CumulusLinux-4-latest cumulus upstream netq
   deb-src  http://apt.cumulusnetworks.com/repo CumulusLinux-4-latest cumulus upstream netq
      
   # NetQ package repository
   #
   deb  http://apps3.cumulusnetworks.com/repos/deb/ CumulusLinux-4 netq-latest
      
   # Debian 10 Buster main package repositories
   # Uncomment these if you want to install upstream Debian packages
   # that are not mirrored in the Cumulus Linux repositories.
   # Packages installed this way may cause problems, and are not
   # officially supported by Cumulus Networks, Inc.
   deb     http://deb.debian.org/debian buster main
   deb     http://deb.debian.org/debian buster-updates main
   deb     http://security.debian.org buster/updates main
   deb     http://deb.debian.org/debian buster-backports main
      
   # Debian 10 Buster main package source repositories
   # Only need to uncomment these if you want to install
   # upstream Debian source packages
   #deb-src http://deb.debian.org/debian buster main
   #deb-src http://deb.debian.org/debian buster-updates main
   #deb-src http://security.debian.org buster/updates main
   #deb-src http://deb.debian.org/debian buster-backports main
   

2. 从源更新本地索引

   root@cumulus:mgmt:/home/cumulus# sudo -E apt-get update
   

3. 从系统中删除和 purge NTP

   root@cumulus:mgmt:/home/cumulus# sudo -E apt-get -y purge --auto-remove ntp
   

4. 安装 Chrony

   root@cumulus:mgmt:/home/cumulus# sudo -E apt-get -y install chrony
   

5. 将 Chrony 添加为管理 VRF 服务到 /etc/vrf/systemd.conf 文件中的系统启动配置

   root@cumulus:mgmt:/home/cumulus# sudo vi /etc/vrf/systemd.conf
   # Systemd-based services that are expected to be run in a VRF context.
   #
   # If changes are made to this file run systemctl daemon-reload
   # to re-generate systemd files.
      
   chef-client
   collectd
   dhcpd
   dhcrelay
   docker
   hsflowd
   netq-agent
   netq-notifier
   netqd
   nslcd
   ntp
   puppet
   salt-minion
   snmpd
   snmptrapd
   ssh
   zabbix-agent
   chrony <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
   

   root@cumulus:mgmt:/home/cumulus# systemctl stop chronyd
   root@cumulus:mgmt:/home/cumulus# systemctl disable chronyd
   root@cumulus:mgmt:/home/cumulus# systemctl enable chrony@mgmt
   root@cumulus:mgmt:/home/cumulus# systemctl restart chrony@mgmt
   root@cumulus:mgmt:/home/cumulus# systemctl daemon-reload
   

6. 为了获得最佳性能，请在 /etc/chrony/chrony.conf 配置文件中添加低延迟时间源。使用 chronyc sources -v 语法来验证配置。

   root@cumulus:mgmt:/home/cumulus# chronyc sources -v
   210 Number of sources = 1
      
     .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
    / .- Source state '*' = current synced, '+' = combined , '-' = not combined,
   | /   '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
   ||                                                 .- 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
   ===============================================================================
   ^* master_source.local.>     2   6    77     6  -1102us[ -108ms] +/- 2754us
   

有关 Chrony 的信息，请参阅 Chrony 项目页面。