同步集群节点时钟

同步节点时钟以避免内部 custer 通信出现问题。

Redis 企业软件

为避免内部集群通信问题影响数据完整性， 确保所有集群节点上的时钟都使用 Chrony 和/或 NTP 同步。

安装 Redis Enterprise Software 时， 安装脚本检查 Chrony 或 NTP 是否正在运行。 如果不是，则安装过程会请求配置计划的 Cron 作业的权限。 这应该确保 node 的 clock 始终同步。 如果您在安装过程中未确认配置此作业，则 您必须定期使用网络时间协议 （NTP） 以确保所有服务器时钟同步。

要同步服务器时钟，请运行适用于您的作系统的命令。

设置 NTP 同步

要设置 NTP 同步，请参阅以下部分，了解特定作系统的说明。

Ubuntu 18.04 和 Ubuntu 20.04

  1. 安装 Chrony，以替代 NTP：

    sudo apt install chrony

  2. Edit the Chrony configuration file:

    sudo nano /etc/chrony/chrony.conf

  3. Add server pool.ntp.org to the file, replace pool.ntp.org with your own NTP server, then save.

  4. Restart the Chrony service:

    sudo systemctl restart chrony

  5. Check the Chrony service status:

    sudo systemctl status chrony

For more details, refer to the official Ubuntu 20.04 documentation.

RHEL 7

  1. Install Chrony, a replacement for NTP:

     sudo yum install chrony

  2. Edit the Chrony configuration file:

    sudo nano /etc/chrony.conf

  3. Add server pool.ntp.org to the file, replace pool.ntp.org with your own NTP server, then save.

  4. Enable and start the Chrony service:

    sudo systemctl enable chronyd && sudo systemctl start chronyd

  5. Check the Chrony service status:

    sudo systemctl status chronyd

For more details, refer to the official RHEL 7 documentation.

RHEL 8 and RHEL 9

  1. Install Chrony, a replacement for NTP:

    sudo dnf install chrony

  2. Edit the Chrony configuration file:

    sudo nano /etc/chrony.conf

  3. Add server pool.ntp.org to the file, replace pool.ntp.org with your own NTP server, then save.

  4. Enable and start the Chrony service:

    sudo systemctl enable chronyd && sudo systemctl start chronyd

  5. Check the Chrony service status:

    sudo systemctl status chronyd

For more details, refer to the official RHEL 8 and 9 documentation.

Amazon Linux 2

  1. Install Chrony, a replacement for NTP:

    sudo yum install chrony

  2. Edit the Chrony configuration file:

     sudo nano /etc/chrony.conf

  3. Add server pool.ntp.org to the file, replace pool.ntp.org with your own NTP server, then save.

  4. Enable and start the Chrony service:

    sudo systemctl enable chronyd && sudo systemctl start chronyd

  5. Check the Chrony service status:

    sudo systemctl status chronyd

For more details, refer to the official Amazon Linux 2 documentation.

If you are using Active-Active databases, you must use Network Time Service (ntpd) to synchronize OS clocks consistently across clusters to handle conflict resolution according to the OS time.

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