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+## Image Update
+
+After making changes to files in the directory, you must run the following
+commands to update the image Kokoro uses:
+
+```shell
+gcloud config set project gvisor-kokoro-testing
+third_party/gvisor/kokoro/ubuntu1604/build.sh
+third_party/gvisor/kokoro/ubuntu1804/build.sh
+```
+
+Note: the command above will change your default project for `gcloud`. Run
+`gcloud config set project` again to revert back to your default project.
+
+Note: Files in `third_party/gvisor/kokoro/ubuntu1804/` as symlinks to
+`ubuntu1604`, therefore both images must be updated.
+
+After the script finishes, the last few lines of the output will container the
+image name. If the output was lost, you can run `build.sh` again to print the
+image name.
+
+```
+NAME PROJECT FAMILY DEPRECATED STATUS
+image-6777fa4666a968c8 gvisor-kokoro-testing READY
++ cleanup
++ gcloud compute instances delete --quiet build-tlfrdv
+Deleted [https://www.googleapis.com/compute/v1/projects/gvisor-kokoro-testing/zones/us-central1-f/instances/build-tlfrdv].
+```
+
+To setup Kokoro to use the new image, copy the image names to their
+corresponding file below:
+
+* //devtools/kokoro/config/gcp/gvisor/ubuntu1604.gcl
+* //devtools/kokoro/config/gcp/gvisor/ubuntu1804.gcl