Information Technology Reference
In-Depth Information
Figure 2.14
In the event the
incorrect NIC is
assigned to ESXi's
management net-
work, you can select
a diff erent NIC.
The other options within the DCUI for troubleshooting management network issues are cov-
ered in detail within Chapter 5.
At this point, you should have management network connectivity to the ESXi host, and from
here forward you can use the vSphere Client to perform other coni guration tasks, such as con-
i guring time synchronization and name resolution.
Confi guring Time Synchronization
Time synchronization in ESXi is an important coni guration because the ramii cations of
incorrect time run deep. While ensuring that ESXi has the correct time seems trivial, time-
synchronization issues can affect features such as performance charting, SSH key expirations,
NFS access, backup jobs, authentication, and more. After the installation of ESXi or during an
unattended installation of ESXi using an installation script, the host should be coni gured to
perform time synchronization with a reliable time source. This source could be another server
on your network or a time source located on the Internet. For the sake of managing time syn-
chronization, it is easiest to synchronize all your servers against one reliable internal time
server and then synchronize the internal time server with a reliable Internet time server. ESXi
provides a Network Time Protocol (NTP) implementation to provide this functionality.
The simplest way to coni gure time synchronization for ESXi involves the vSphere Client.
Perform the following steps to enable NTP using the vSphere Client:
1. Use the vSphere Client to connect directly to the ESXi host (or to a vCenter Server instal-
lation, if you have vCenter Server running at this point).
2. Select the hostname from the inventory tree on the left, and then click the Coni guration
tab in the details pane on the right.
3. Select Time Coni guration from the Software menu.
4. Click the Properties link.
5. In the Time Coni guration dialog box, select NTP Client Enabled.
6. Still in the Time Coni guration dialog box, click the Options button.
7. Select the NTP Settings option in the left side of the NTP Daemon (ntpd) Options dialog
box, and add one or more NTP servers to the list, as shown in Figure 2.15.
 
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