User Guide

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AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide

Chapter 39 Centralized Management Using Clusters

Managing Clusters

Note If you use the upgrade command before disconnecting the individual machine from the cluster, AsyncOS

disconnects all the machines in the cluster. Cisco Systems recommends that you disconnect each

machine from the cluster before upgrading it. Then, other machines can continue working as a cluster

until each is disconnected and upgraded.

Procedure

Step 1 On a machine in the cluster, use the disconnect operation of clusterconfig. For example, to disconnect

the machine

losangeles.example.com, type clusterconfig disconnect losangeles.example.com.

commit is necessary.

Step 2 Optionally, use the suspendlistener command to halt acceptance of new connections and messages

during the upgrade process.

Step 3 Issue the upgrade command to upgrade AsyncOS to a newer version.

Note Disregard any warnings or confirmation prompts about disconnecting all of the machines in the

cluster. Because you have disconnected the machine, AsyncOS does not disconnect the other

machines in the cluster at this point.

Step 4 Select the version of AsyncOS for the machine. The machine will reboot after the upgrade is complete.

Step 5 Use the resume command on the upgraded machine to begin accepting new messages.

Step 6 Repeat steps 1 - 5 for each machine in the cluster.

Note After you disconnect a machine from the cluster, you cannot use it to change the configurations

of other machines. Although you can still modify the cluster configuration, do not change it

while machines are disconnected because settings can become unsynchronized.

Step 7 After you have upgraded all the machines, use the reconnect operation of clusterconfig for each upgraded

machine to reconnect it. For example, to reconnect the machine

losangeles.example.com, type

clusterconfig reconnect losangeles.example.com. Note that you can only connect a machine to

a cluster that is running the same version of AsyncOS.

CLI Command Support

All Commands Are Cluster-aware

All CLI commands in AsyncOS are now cluster-aware. The behavior of some commands will change

slightly when issued in a cluster mode. For example, the behavior of the following commands changes

when issued on a machine that is part of a cluster: