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title description services author manager ms.service ms.topic ms.date ms.author
Azure CDN endpoint multi-origin (Preview)
Get started with Azure CDN endpoint multiple origins.
cdn
asudbring
KumudD
azure-cdn
how-to
9/06/2020
allensu

Azure CDN endpoint multi-origin (Preview)

Multi-origin support eliminates downtime and establishes global redundancy.

By choosing multiple origins within an Azure CDN endpoint, the redundancy provided spreads the risk by probing the health of each origin and failing over if necessary.

Setup one or more origin groups and choose a default origin group. Each origin group is a collection of one or more origins that can take similar workloads.

Note

Currently this feature is only available from Azure CDN from Microsoft.

Important

Azure CDN endpoint multi-origin is currently in public preview. This preview version is provided without a service level agreement, and it's not recommended for production workloads. Certain features might not be supported or might have constrained capabilities. For more information, see Supplemental Terms of Use for Microsoft Azure Previews.

Create the origin group

  1. Sign in to the Azure portal

  2. Select your Azure CDN profile and then select the endpoint to be configured for multi-origin.

  3. Select Origin under Settings in the endpoint configuration:

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-1.png" alt-text="CDN endpoint" border="true":::

  4. To enable multi-origin, you need at least one origin group. Select Create Origin Group:

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-2.png" alt-text="Origin settings" border="true":::

  5. In the Add Origin Group configuration, enter or select the following information:

    Setting Value
    Origin group name Enter a name for your origin group.
    Probe status Select Enabled.
    Azure CDN will run health probes from different points across the globe to determine origin health. Don't enable if the current origin group isn't active to avoid additional cost.
    Probe path The path in the origin that is used to determine the health.
    Probe interval Select a probe interval of 1, 2, or 4 minutes.
    Probe protocol Select HTTP or HTTPS.
    Probe method Select Head or Get.
    Default origin group Select the box to set as default origin group.

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-3.png" alt-text="Add origin group" border="true":::

  6. Select Add.

Add multiple origins

  1. In the origin settings for your endpoint, select + Create Origin:

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-5.png" alt-text="Create origin" border="true":::

  2. Enter or select the following information in the Add Origin configuration:

    Setting Value
    Name Enter a name for the origin.
    Origin Type Select Storage, Cloud Service, Web App, or Custom origin.
    Origin hostname Select or enter your origin hostname. The drop-down lists all available origins of the type you specified in the previous setting. If you selected Custom origin as your origin type, enter the domain of your customer origin server.
    Origin host header Enter the host header you want Azure CDN to send with each request, or leave the default.
    HTTP port Enter the HTTP port.
    HTTPS port Enter the HTTPS port.
    Priority Enter a number between 1 and 5.
    Weight Enter a number between 1 and 1000.

    [!NOTE] When an origin is created within an origin group, it must be accorded a priority and weight. If an origin group has only one origin, then the default priority and weight is set as 1. Traffic is routed to the highest priority origins if the origin is healthy. If an origin is determined to be unhealthy then the connections are diverted to another origin in the order of priority. If two origins have the same priority, then traffic is distributed as per weight specified for the origin

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-6.png" alt-text="Add additional origin" border="true":::

  3. Select Add.

  4. Select Configure origin to set the origin path for all origins:

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-7.png" alt-text="Configure origin path" border="true":::

  5. Select OK.

Configure origins and origin group settings

Once you have several origins and an origin group, you can add or remove the origins into different groups. Origins within the same group should serve similar workloads. Traffic will be distributed into these origins based on their healthy status, priority, and weight value.

  1. In the origin settings of the Azure CDN endpoint, select the name of the origin group you wish to configure:

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-8.png" alt-text="Configure origins and origin group settings" border="true":::

  2. In Update origin group, select + Select Origin:

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-9.png" alt-text="Update origin group" border="true":::

  3. Select the origin to be added to the group in the pull-down box and select OK.

  4. Verify the origin has been added to the group, then select Save:

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-10.png" alt-text="Verify additional origin added to group" border="true":::

Remove origin from origin group

  1. In the origin settings of the Azure CDN endpoint, select the name of the origin group:

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-8.png" alt-text="Remove origin from group" border="true":::

  2. To remove an origin from the origin group, select the trash can icon next to the origin and select Save:

    :::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-11.png" alt-text="Update origin group delete origin" border="true":::

Override origin group with rules engine

Customize how traffic is distributed to different origin groups by using the standard rules engine.

Distribute traffic to a different group based on the request URL.

  1. In your CDN endpoint, select Rules engine under Settings:

:::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-12.png" alt-text="Rules engine" border="true":::

  1. Select + Add rule.

  2. Enter a name for the rule in Name.

  3. Select + Condition, then select URL path.

  4. In the operator pull-down, select Contains.

  5. In Value, enter /images.

  6. Select + Add action, then select Origin group override.

  7. In Origin group, select the origin group in the pull-down box.

:::image type="content" source="./media/endpoint-multiorigin/endpoint-multiorigin-13.png" alt-text="Rules engine conditions" border="true":::

For all incoming requests if the URL path contains /images, then the request will be assigned to the origin group in the action section (myorigingroup).

Next Steps

In this article, you enabled Azure CDN endpoint multi-origin.

For more information on Azure CDN and the other Azure services mentioned in this article, see: