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What is the metadata server?

April 26, 2017metadata server

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What is the metadata server?

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The metadata server responds to HTTP queries from VMs, using the same path names as the EC2 metadata server The URL for this is obtained by looking at ‘/var/nimbus-metadata-server-url’ on the VM, which is an optional customization task injected by the Nimbus service on your behalf (we are considering trying to simulate Amazon’s hardcoded IP address “169.254.169.254” on any subnet, feedback on this idea is appreciated). Like on EC2, its responses are based on the source IP address from the TCP packet, giving the information specific to each VM instance. This also means there is an assumption that the immediately local network is non-spoofable. Administrators, you should also put in place a firewall rule that restricts this port to the VMs only, just in case. The metadata server is disabled by default, consult your administrator (or try a query from inside your VM). Administrators, see “services/etc/nimbus/workspace-service/metadata.conf” for the details.