Basic Operations on a Grayscale Task

Description

Basic operations on a grayscale version are performed by modifying the configuration of the DestinationRule and VirtualService resources of Istio. After the modification is complete, wait for about 10 seconds for the new policy to take effect.

Modifying the Traffic Policy of a Grayscale Version

Modifying a grayscale policy that is based on traffic ratio

For such a grayscale policy that is based on traffic ratio, you can gradually increase the traffic ratio of the grayscale version to avoid service risks caused by direct traffic switchover. To change the traffic ratio, perform the following steps:

1. Log in to the ASM console and click the name of the target service mesh to go to its details page.
2. In the navigation pane, choose Grayscale Release. Then click the target canary release task.
3. On the Configure Traffic Policy page, set the traffic ratio of the grayscale version.

   If the traffic ratio of the grayscale version is set to x, the traffic ratio of the original version is automatically adjusted to 100-x.

4. Click Deliver Policy.

Modifying a grayscale policy that is based on request content

With such a policy, a grayscale version can be accessed only when the traffic meets the rules based on Cookies, Headers, Queries, Allowed Operating Systems, and Allowed Browsers. In real-world use cases, rules may be modified for multiple times to fully verify the performance of the grayscale version.

1. Log in to the ASM console and click the name of the target service mesh to go to its details page.
2. In the navigation pane on the left, choose Grayscale Release and click the target canary release task.
3. On the Configure Traffic Policy page, reconfigure Cookie, Header, Query, Allowed OS, and Allowed Browser.
4. Click Deliver Policy.

Switching the Grayscale Policy Type

You can change the type of a grayscale policy from based on request content to based on traffic ratio and vice versa. After this operation is complete, all configured rules become invalid and all traffic is redistributed based on the new policy.

Grayscale policies can be changed only for running tasks. After a grayscale version is released (that is, the new version completely takes over the traffic and the old version has been brought offline), its grayscale policy cannot be reconfigured.

1. Log in to the ASM console and click the name of the target service mesh to go to its details page.
2. In the navigation pane on the left, choose Grayscale Release and click the target canary release task.
3. On the Configure Traffic Policy page, change the policy type.
4. Click Deliver Policy.

Taking Over All Traffic

After you click Take Over All Traffic, the original version or grayscale version takes over all traffic.

1. Log in to the ASM console and click the name of the target service mesh to go to its details page.
2. In the navigation pane on the left, choose Grayscale Release and click the target grayscale release task.
3. On the Monitor and Manage Traffic page, click Take Over All Traffic next to the target version.
   Figure 1 Taking over all traffic
   

4. In the displayed dialog box, click OK.

Terminating a Grayscale Release Task

After the grayscale version takes over all traffic, you can terminate the grayscale task. After the grayscale task is canceled, the original version will be brought offline, and all workloads and Istio configuration resources will be deleted.

1. Log in to the ASM console and click the name of the target service mesh to go to its details page.
2. In the navigation pane on the left, choose Grayscale Release and click the target grayscale release task.
3. On the Monitor and Manage Traffic page, click Take Over All Traffic next to the grayscale version.
4. Click Terminate Task in the lower right corner.
5. In the displayed dialog box, click OK.

   You can go to the Terminated Tasks tab page to view the finished grayscale task. The Release Result is Released successfully.

Canceling a Grayscale Release Task

After the original version takes over all traffic, you can cancel the grayscale task.

1. Log in to the ASM console and click the name of the target service mesh to go to its details page.
2. In the navigation pane on the left, choose Grayscale Release and click the target grayscale release task.
3. On the Monitor and Manage Traffic page, click Take Over All Traffic next to the original version.
4. Click Cancel Task in the lower right corner. You can also click in the upper right corner of a task in the grayscale task list.
5. In the displayed dialog box, click OK.

   You can go to the Terminated Tasks tab page to view the finished grayscale task. The Release Result is Released canceled.

Viewing Terminated Grayscale Release Tasks

You can view canceled and finished grayscale tasks on the Terminated Tasks tab page.

1. Log in to the ASM console and click the name of the target service mesh to go to its details page.
2. In the navigation pane on the left, choose Grayscale Release and click the Terminated Tasks tab page.

   You can view the release task name, release result, service, and release time, and delete a terminated task.