The upgrade process preserves as much of the ESX host configuration as possible. However, because of the architectural differences between ESX 4.x and ESXi 5.x architecture, many configuration files cannot be migrated when you select the Migrate option in the ESXi installation or upgrade wizard.
Pertinent VMware files, such as /etc/vmware/esx.conf are migrated, but many existing settings such as third-party agents and scripts, cannot be migrated.
If a 4.x host contains customizations, such as third-party VIBS or drivers, upgrading with the standard VMware installer ISO will result in the loss of those customizations, and possibly an unstable system. Use ESXi Image Builder CLI to create a customized ESXi installer ISO file that includes the VIBs or drivers. See the information on Image Builder in the vSphere Installation and Setup documentation.
|/etc/logrotate.conf||Not migrated. ESXi Logrotation is incompatible with prior versions.|
|/etc/localtime||Not migrated. Timezones are not supported in ESXi.|
|/etc/syslog.conf||Migrated for ESXi, not migrated for ESX.|
|/etc/security/access.conf||Migrated. Needed for PAM configurations.|
|/etc/sysconfig/network||Migrated. Service Console virtual NICs (vswifs) will be converted to ESXi virtual NICs. (vmks)|
|/etc/sysconfig/i18n||Not migrated. i18n is not supported in ESXi|
|/etc/sysconfig/clock||Not migrated. Timezones are not supported in ESXi.|
|/etc/sysconfig/syslog||Not migrated. The syslog daemon is incompatible with prior versions.|
|/etc/sysconfig/keyboard||Migrated. Any entries not supported will default to English.|
|/etc/sysconfig/mouse||Not migrated. No mouse support in ESXi.|
|/etc/ssh||Not migrated. See SSH Configuration Affected by Upgrading or Migrating to ESXi 5.x.|
|/etc/nsswitch.conf||Migrated. Used generically for various configurations, most helpful for Active Directory authentication.|
|/etc/yp.conf||Not migrated. NIS is not supported in ESXi.|
|/etc/krb.conf||Needed for Likewise to have Active Directory support.|
|/etc/login.defs||Not migrated. This file controls settings like maildir, password aging controls, uid and gid min/max settings, and the user deletion command.|
|/etc/pam.d/*||Partially migrated. Needed for authentication and authorization.
Note: Custom edits made to settings in /etc/pam.d/system-auth in ESX 4.x are reset to the default values by the upgrade to ESXi 5.x. To maintain the custom values, reset them manually after the upgrade.
|/etc/ldap.conf||Not migrated. LDAP is not supported in ESXi.|
|/etc/sudoers||Not migrated. SUDO is not supported in ESXi.|
|/etc/snmp/snmpd.conf||Migrated to /etc/vmware/snmp.xml.|
|/etc/rc.d/rc*.d/*||Not migrated. ESX and ESXi rc.d scripts are incompatible.|
|/etc/xinetd.conf||Not migrated. xinetd is not supported in ESXi.|
|/etc/motd||Migrated. A note is appended saying the system was upgraded to ESX 5.x|
|/etc/likewise/*||Migrated. Used for Likewise configurations.|
|etc/vmware/init/*||Not migrated. Init scripts are incompatible.|
|/etc/vmware/simple.map||Not migrated. A new simple.map file is generated.|
|/etc/vmware/license.cfg||Not migrated. The valuation mode timer is be reset on upgrades.|
|/etc/vmware/vmware.lic||Not migrated. ESXi 5.x upgrades are reset to evaluation mode.|
|/etc/vmware/hostd/config.xml||Not migrated. This file is currently incompatible with ESXi.|
|/etc/vmware/hostd/proxy.xml||Not migrated. This file is currently incompatible with ESXi.|
|/etc/vmware/vmauth/authentication.conf||Migrated. Used for Likewise configurations.|
|/etc/fstab||Partially migrated. Only NFS entries will be migrated to ESXi.|
|/etc/passwd||Partially migrated. Only the root user password will be saved, if possible.|