7.2

For example, if you have an application that contains a Web and database service and you define a link in
the Web service to the database service by using an alias of my-db, the Web service application opens a
TCP connection to my-db:{PORT_OF_DB}. The PORT_OF_DB is the port that the database listens to,
regardless of the public port that is assigned to the host by the container settings. If MySQL is checking
for updates on its default port of 3306, and the published port for the container host is 32799, the Web
application accesses the database at my-db:3306 .
Note It is recommended that you use networks instead of links. Links are now a legacy Docker feature
with significant limitations when linking container clusters, including:
n
Docker does not support multiple links with the same alias. It is recommended that you allow
Containers for vRealize Automation to generate link aliases for you.
n
You cannot update the links of a container runtime. When scaling up or down a linked cluster, the
dependent container’s links will not be updated.
Prerequisites
n
Verify that Containers for vRealize Automation is enabled in your supported vRealize Automation
deployment.
n
Verify that you have container administrator or container architect role privileges.
n
Verify that a bridge network is available for linking services.
n
Verify that the internal port of the target service is published. For cross communication, the service
can be mapped to any other port but must be accessible from outside the host.
n
Verify that the service hosts are able to access each other.
Procedure
1 Log in to vRealize Automation.
2 Click the Containers tab.
3 Click Templates in the left pane.
4 Edit the template or image.
5 To edit a template
a Click Edit in the upper-right section of the template that you want to open.
b If the template contains multiple templates, point to the template that you want to edit, and click
Edit in the upper-right section of the template that you want to open.
6 To edit an image.
a Click the arrow next to the image's Provision button, and click Enter additional info.
The Provision a Container or Edit Container Definition page appears, providing access to
categorized sets of editable properties and settings.
7 Click the Basic tab.
Configuring vRealize Automation
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