As part of the Enterprise Deployment Guide (EDG) Oracle recommend using a virtual IP (VIP) for the admin server. This article explains the steps to setup a VIP and failover the admin server (collocated).

There is no need to create a new compute node for the admin server. Compute nodes in MyST are represented as physical servers.

Assumptions

• Two physical servers
  • Physical1 - Managed Server1 + Admin Server (collocated)
  • Physical2 - Managed Server2
• Failover between existing nodes in the domain
• Shared storage for aserver domain home

6.5.0-rc8 or Newer

Setup Admin Server with a VIP

Start by setting the machine listen address which MyST references for the AdminServer listen address.

1. Override the AdminServer Machine name to be a generic name. Eg. 'admin'.
   TIP: This can be done in the Platform Blueprint. If environments are already provisioned then you may want to control the rollout in the Platform Model instead.
   
2. Use a VIP for the admin server machine's listen address
   

Failing Over the Admin Server

In order to failover the Adminserver you will need to move the Admin Server product within the Compute Nodes.

Update the AdminServer Product in Compute Nodes

1. Go to Platform Model > Compute Nodes
2. Update the Admin Server product to it's respective node. In this example we move the Admin Server from soa - 01 to soa - 02.
   1. Delete Admin Server from soa - 01
      
   2. Add into soa - 02
      
3. Click
4. Click Actions > Update
5. Stop the Admin Server (Custom action: stop-as-via-nm)
6. Stop the Node Managers (Custom action: stop-nm)
7. Update the DNS for adminserver-vip.internal to point to the new IP address
8. Start the Node Managers (Custom action: start-nm)
9. Start the Admin Server (Custom action: start-as-via-nm)
10. The Admin Server will now be successfully running on soa - 01.

6.5.0-rc7 or Older

Moving the Admin Server product in older versions of MyST caused invalid auto computed properties to be generated. Upgrade to 6.5.0-rc8+ for an improved experience.

Setup Admin Server with a VIP

MyST uses the admin server machine's listen address to also set the admin server listen address. Here we set the machine listen address.

1. Use a VIP for the admin server machine's listen address

Failing Over the Admin Server

Configuration change sin MyST are required to fail over the admin server to another node in the domain.

Updating Compute Nodes

1. Go to Compute Nodes
2. Update the Admin Server product to it's respective node. For example:
   1. Delete from node 1
   2. Add into node 2
3. Click to refresh the data in MyST
4. Go to Machines
5. Remove the auto-computed machine
6. Restore the Name and Listen Address. This was re-computed by MyST when updating the Admin Server product.
7. Click

Updating the Platform Instance Revision

Force MyST to update the platform model [pmNN] revision (which contains the above compute node changes) you can use the reprovision option while selecting 'Environment already pre-provisioned' checkbox.

1. Go to Actions > Reprovision
2. Select Environment already pre-provisioned?
3. Click

MyST Actions

The MyST actions are expected to work as normal. No changes are required.

Patch

• MyST runs patch action against each compute node

Install

• Product binaries are installed to each compute node

Update

• The update action connects to the admin server's listen address (VIP) using WLST