Provide additional threads, retry until not failed #1395
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SUMMARY
Provisioner can intermittently fail during image pulls with "Failed to pull image" message. Additionally, when adding Projects to controller, "Project update failed" message can occur. Occasionally, the underlying error is "Error: Error writing blob to file "/var/tmp/storage/storage304273906/1": error happened during read: unexpected EOF
Research on this issue: lead to similar issue being reported in buildah project for container engine pulls: http://github.com/containers/buildah/issues/2224
Ultimately, containers.conf was "wired up" to allow raising the number of threads for simultaneous image layer copies (pulled/pushed).
Raising container engine parallel threads from 6 to 10 and adding retries until not failed for associated image pull tasks to resolve the issue.
ISSUE TYPE
COMPONENT NAME
ADDITIONAL INFORMATION
To reproduce, deploy a 50 student workshop multiple times over the period of the day, you will experience intermittent failures on a small percentage of controllers.