6.0.1

Reconnect a Managed Host
Use the vSphere Client to reconnect a managed host to a vCenter Server system.
Procedure
1 From the vSphere Client connected to a vCenter Server system, display the inventory and click the
managed host to reconnect.
2 Right-click the host and select Connect from the pop-up menu.
When the managed host’s connection status to vCenter Server is changed, the statuses of the virtual
machines on that managed host are updated to reect the change.
Reconnecting Hosts After Changes to the vCenter Server SSL Certificate
vCenter Server uses an SSL certicate to encrypt and decrypt host passwords stored in the vCenter Server
database. If the certicate is replaced or changed, vCenter Server cannot decrypt host passwords, and
therefore cannot connect to managed hosts.
If vCenter Server fails to decrypt a host password, the host is disconnected from vCenter Server. You must
reconnect the host and supply the login credentials, which will be encrypted and stored in the database
using the new certicate.
Remove a Host from a Cluster
When a host is removed from a cluster, the resources it provides are deducted from the total cluster
resources. The virtual machines deployed on the host are either migrated to other hosts within the cluster, or
remain with the host and are removed from the cluster, depending on the state of the virtual machines when
the host is removed from the cluster.
You can remove hosts from a cluster by selecting them in the inventory and dragging them to a new location
within the inventory. The new location can be a folder as a standalone host or another cluster.
Prerequisites
Before you can remove a host from a cluster, you must power o all virtual machines that are running on
the host, or migrate the virtual machines to a new host using vMotion.
Procedure
1 From the vSphere Client connected to a vCenter Server system, display the inventory.
2 Right-click the appropriate managed host icon in the inventory panel, and select Enter Maintenance
Mode from the pop-up menu.
If all virtual machines on the host are not powered o, the host will not enter maintenance mode.
If the host is inside a DRS-enabled cluster, entering maintenance mode causes DRS to aempt to
automatically evacuate powered-on virtual machines from the host using vMotion.
3 In the conrmation dialog that appears, click Yes.
The conrmation dialog also asks if you want to automatically evacuate virtual machines that are not
powered on from the host. This is useful if you want those virtual machines to remain registered to a
host within the cluster.
The host icon changes and the term “maintenance mode” is added to the name in parentheses.
vCenter Server and Host Management
114 VMware, Inc.