vCenter Pre-upgrade fails

Error: Internal error occurred during execution of upgrade process.

Resolution: Send upgrade log files to VMware technical support team for further Assistance.

Upgrade logs say:

	less /var/log/vmware/upgrade/bootstrap.log
	2018-03-23T20:14:34.11Z ERROR transport.guestops Invalid command: "/bin/bash" --login -c '/opt/vmware/share/vami/vami_get_network eth0 1>/tmp/vmware-root/exec-vmware47-
	stdout 2>/tmp/vmware-root/exec-vmware235-stderr'
	None
	2018-03-23T20:14:34.12Z ERROR upgrade_commands Unable to execute pre-upgrade checks on host 10.1.0.209
	Traceback (most recent call last):
	File "/usr/lib/vmware/cis_upgrade_runner/bootstrap_scripts/upgrade_commands.py", line 2199, in execute
	preupgradeResult = self._executePreupgradeChecks()
	File "/usr/lib/vmware/cis_upgrade_runner/bootstrap_scripts/upgrade_commands.py", line 2655, in _executePreupgradeChecks
	srcIpv4Address, srcIpv4SubnetMask, srcIpv6Address, srcIpv6Prefix = retrieveNetworkingConfiguration(self.opsManager)
	File "/usr/lib/vmware/cis_upgrade_runner/bootstrap_scripts/transfer_network.py", line 1309, in retrieveNetworkingConfiguration
	interface)
	File "/usr/lib/vmware/cis_upgrade_runner/bootstrap_scripts/apply_networking.py", line 188, in _retrieveNetworkIdentity
	networkConfig = vamiGetNetwork(processManager, interface)
	File "/usr/lib/vmware/cis_upgrade_runner/bootstrap_scripts/apply_networking.py", line 144, in vamiGetNetwork
	output = _execNetworkConfigCommand(processManager, [VAMI_GET_NETWORK_CMD, interface])
	File "/usr/lib/vmware/cis_upgrade_runner/bootstrap_scripts/apply_networking.py", line 66, in _execNetworkConfigCommand
	cr = transport.executeCommand(processManager, cmd)
	File "/usr/lib/vmware/cis_upgrade_runner/libs/sdk/transport/__init__.py", line 122, in executeCommand
	return processManager.pollProcess(processUid, True)
	File "/usr/lib/vmware/cis_upgrade_runner/libs/sdk/proxy.py", line 81, in __call__
	ret = self.func(*args, **kwargs)
	File "/usr/lib/vmware/cis_upgrade_runner/libs/sdk/transport/guestops.py", line 1184, in pollProcess
	self._checkInvalidCommandError(processInfo, stderr)
	File "/usr/lib/vmware/cis_upgrade_runner/libs/sdk/transport/guestops.py", line 1123, in _checkInvalidCommandError
	raise ExecutionException(error, ErrorCode.INVALID_REQUEST)
	ExecutionException: ('Invalid command: "/bin/bash" --login -c \'/opt/vmware/share/vami/vami_get_network eth0 1>/tmp/vmware-root/exec-vmware47-stdout 2>/tmp/vmware-root/
	exec-vmware235-stderr\'', 1)
	2018-03-23T20:14:39.442Z ERROR __main__ ERROR: Fatal error during upgrade REQUIREMENTS. For more details take a look at: /var/log/vmware/upgrade/requirements-upgrade-runner.log
	 

Now look at the source appliance.

	VMware VirtualCenter 6.0.0 build-3339084
	vCenter:~ # ifconfig
	eth0 Link encap:Ethernet HWaddr 00:50:56:AC:53:FD
	inet addr:x.x.x.x Bcast:x.x.x.x Mask:255.255.252.0
	UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
	RX packets:45028984 errors:0 dropped:28266 overruns:0 frame:0
	TX packets:16476384 errors:0 dropped:0 overruns:0 carrier:0
	collisions:0 txqueuelen:1000
	RX bytes:74680502042 (71220.8 Mb) TX bytes:7187692049 (6854.7 Mb)
	lo Link encap:Local Loopback
	inet addr:127.0.0.1 Mask:255.0.0.0
	inet6 addr: ::1/128 Scope:Host
	UP LOOPBACK RUNNING MTU:16436 Metric:1
	RX packets:147809637 errors:0 dropped:0 overruns:0 frame:0
	TX packets:147809637 errors:0 dropped:0 overruns:0 carrier:0
	collisions:0 txqueuelen:0
	RX bytes:93984509789 (89630.6 Mb) TX bytes:93984509789 (89630.6 Mb)

Run /opt/vmware/share/vami/vami_get_network  less returns an dependency error:

vCenter:~ # /opt/vmware/share/vami/vami_get_network eth0 1 | less
	/opt/vmware/share/vami/vami_get_network: error while loading shared libraries: libvami-common.so: cannot open shared object file: No such file or directory

To resolve this, re-create the link to dependency by running the below commands.

echo "LD_LIBRARY_PATH=${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}/opt/vmware/lib/vami/" >> /etc/profile
echo 'export LD_LIBRARY_PATH' >> /etc/profile

Re-run the command to confirm if it is returning the IP details

/opt/vmware/share/vami/vami_get_network
	vCenter55:~ # /opt/vmware/share/vami/vami_get_network
	interface: eth0
	config_present: true
	config_flags: STATICV4
	config_ipv4addr: 10.1.0.209
	config_netmask: 255.255.252.0
	config_broadcast: 10.1.3.255
	config_gatewayv4:
	config_ipv6addr:
	config_prefix:
	config_gatewayv6: 10
	autoipv6:
	active_ipv4addr: 10.1.0.209
	active_netmask: 255.255.252.0
	active_broadcast: 10.1.3.255
	active_ipv6addr:
	active_prefix:
	active_gatewayv4: 10.1.0.61
	active_gatewayv6:
	hasdhcpv6: 1
	Traceback (most recent call last):
	File "/opt/vmware/share/vami/vami_ovf_process", line 25, in <module>
	import libxml2
	File "/usr/lib64/python2.6/site-packages/libxml2.py", line 1, in <module>
	ImportError: No module named libxml2mod
	managed:

vami_ovf_process and libxml2.py can be ignored
Re-run the upgrade/migration.