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These settings can be changed using the Virtual Infrastructure Client or from the physical or a remote console connection (ILO, RSA, DRAC, etc)

From the Virtual Infrastructure Client

1.Highlight the ESX Server host and click on the Configuration tab
2.Click on DNS and Routing
3.Click on Properties...
4.To change the hostname, domain, and DNS servers, click on the DNS Configuration tab and enter the appropriate values
5.To change the default gateway, click on the Routing tab and enter the appropriate values

Note: Hostname and domain changes through the Virtual Infrastructure Client do not take place until the ESX host is rebooted.

From the physical or remote console connection

Edit the /etc/hosts file with an editor and modify it so that it reflects the proper IP address and hostname.

To change the default gateway address and the hostname for the Service Console edit the /etc/sysconfig/network file and change the GATEWAY and HOSTNAME parameters to the proper values.

After you edit these files, you must reboot the host or restart the network service using the following command:

--root@server root--# service network restart

Note: This command will break any current network connections to the service console.

You can also dynamically change the hostname using the command:

--root@server root--# hostname newname

Note: This command creates a temporary hostname change. This change is lost when the system is rebooted.

To change the DNS server settings, edit the /etc/resolv.conf file, update the nameserver IPs, and search domain if applicable.

Verifying ESX Server host networking configuration on the service console

1. Editing the VMX file of the VM
2. Edit the VMX file of the VM
3. Change the following line from ethernetN.addressType="vpx" to ethernetN.addressType="static" (N is the number of your ethernet adapter, usually 0)
4. Next change the line "ethernetN.GeneratedAddress" to "ethernetN.address" and then change the current MAC address to "00:50:56:XX:YY:ZZ" (again N is the number of your ethernet adapter and XX is a valid hex number between 00 and 3F, and YY and ZZ are valid hex numbers between 00 and FF. The value for XX must not be greater than 3F in order to avoid conflict with MAC addresses that are generated by the VMware Workstation and VMware GSX Server products.)
5. Power your VM back on. Login to the OS, go to the CMD prompt and type "ipconfig /all", your manually assigned MAC address should be listed for the NIC that you changed

1. Edit the Local Area Connection propeties for the NIC you want to change
2. Click the Configure button next to the NIC name
3. On the Advanced tab select NetworkAddress
4. In the Value field enter a new value for the MAC address, enter only numbers or letters, no spaces, dashes or colons. This MAC address can be any valid hex numbers between 00 and FF for any of the octets
5. Click OK and that's it, the new MAC address takes effect immediately and will override any MAC address set by Vmware

1. Use Virtual Center to Vmotion all of the VMs to other ESX hosts. (if you have a stand alone host then power down all your VMs)
2. Put the host in Maintenance Mode
3. Reboot your ESX host.
4. Physically go to the ESX console. You will not be able to use a remote console like WinSCP for the next few steps.
5. At the first menu type "a"
6. At the next prompt type "single"
7. After ESX finishes booting you will end up at a # prompt
8. Type "passwd" and enter a new password
9. re-type the new password again when prompted
10. Reboot the ESX server normally. ( just type "reboot" at the # prompt)
11. Don't forget to take the host out of Maintenance Mode in Virtual Center.

vi /etc/sysconfig/clock
et renseigner le fichier clock de la façon suivant :
ZONE = "Europe/Paris"
UTC = False
ARC = False
cp /usr/share/zoneinfo/Europe/Paris /etc/localtime
date => doit afficher un ... CET...
hwclock affiche l'heure hardware de la machine
hwclock --hctosys => copie l'heure hardware (BIOS) vers l'ESX
hwclock --systohc => copie l'heure ESX vers le BIOS

• Problème rencontré depuis le 11 aout
• General System Error occurred: Internal error when powering up a vm on ESX 3.5 Update 2and ESX 3i 3.5 Update 2.
• From the logs( /var/log/vmware/hostd.log) , Message from : This product has expired.
• http://kb2.vmware.com/kb/1006716.html

• The temporary work around to this is to change the date to before 10 august.
• From VI CLient, click on ESX Host > Configuration > Time Configuration > Properties and change the time to before 10 aug 2008.

• This should Power the VM on. Or stop NTP

• Once your VM's are turned on, change to current date.
• http://kb2.vmware.com/kb/1006721.html