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6.2. Web UI: Using the Topology Graph to Manage Replication Topology

Accessing the Topology Graph

The topology graph in the web UI shows the relationships between the servers in the domain:
  1. Select IPA ServerTopologyTopology Graph.
  2. If you make any changes to the topology that are not immediately reflected in the graph, click Refresh.

Customizing the Topology View

You can move individual topology nodes by dragging the mouse:

Figure 6.3. Moving Topology Graph Nodes

Moving Topology Graph Nodes
You can zoom in and zoom out the topology graph using the mouse wheel:

Figure 6.4. Zooming the Topology Graph

Zooming the Topology Graph
You can move the canvas of the topology graph by holding the left mouse button:

Figure 6.5. Moving the Topology Graph Canvas

Moving the Topology Graph Canvas

Interpreting the Topology Graph

Servers joined in a domain replication agreement are connected by an orange arrow. Servers joined in a CA replication agreement are connected by a blue arrow.
Topology graph example: recommended topology
Figure 6.6, “Recommended Topology Example” shows one of the possible recommended topologies for four servers: each server is connected to at least two other servers, and more than one server is a CA master.

Figure 6.6. Recommended Topology Example

Recommended Topology Example
Topology graph example: discouraged topology
In Figure 6.7, “Discouraged Topology Example: Single Point of Failure”, server1 is a single point of failure. All the other servers have replication agreements with this server, but not with any of the other servers. Therefore, if server1 fails, all the other servers will become isolated.
Avoid creating topologies like this.

Figure 6.7. Discouraged Topology Example: Single Point of Failure

Discouraged Topology Example: Single Point of Failure
For details on topology recommendations, see Section 4.2, “Deployment Considerations for Replicas”.

6.2.1. Setting up Replication Between Two Servers

  1. In the topology graph, hover your mouse over one of the server nodes.

    Figure 6.8. Domain or CA Options

    Domain or CA Options
  2. Click on the domain or the ca part of the circle depending on what type of topology segment you want to create.
  3. A new arrow representing the new replication agreement appears under your mouse pointer. Move your mouse to the other server node, and click on it.

    Figure 6.9. Creating a New Segment

    Creating a New Segment
  4. In the Add Topology Segment window, click Add to confirm the properties of the new segment.
IdM creates a new topology segment between the two servers, which joins them in a replication agreement. The topology graph now shows the updated replication topology:

Figure 6.10. New Segment Created

New Segment Created

6.2.2. Stopping Replication Between Two Servers

  1. Click on an arrow representing the replication agreement you want to remove. This highlights the arrow.

    Figure 6.11. Topology Segment Highlighted

    Topology Segment Highlighted
  2. Click Delete.
  3. In the Confirmation window, click OK.
IdM removes the topology segment between the two servers, which deletes their replication agreement. The topology graph now shows the updated replication topology:

Figure 6.12. Topology Segment Deleted

Topology Segment Deleted