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use managed identity reader access for scaleset configs #1060
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chkeita
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Jul 13, 2021
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The new custom script extension configs are not always pulled during reimage. As such, VMs that outlive the SAS duration may not reimage correctly.
This moves to using a role assignment created at deployment for the scalesets to give read access to the
configblob storage using the managed identity, rather than using SAS URLs.https://docs.microsoft.com/en-us/azure/virtual-machines/extensions/custom-script-linux#property-managedidentity
Short-life VMs (proxies & repros) continue to use the existing SAS mechanism.