File: //usr/lib/python2.7/site-packages/azurelinuxagent/common/osutil/iosxe.pyo
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Unlike redhat 6.x, redhat 7.x will set hostname via hostnamectl
Due to a bug in systemd in Centos-7.0, if this call fails, fallback
to hostname.
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Restart NetworkManager first before publishing hostname
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Azure records a UUID as the instance ID
First check /sys/class/dmi/id/product_uuid.
If that is missing, then extracts from dmidecode
If nothing works (for old VMs), return the empty string
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