[GitHub] [cloudstack] onitake opened a new issue #3557: cloud-init fails to fetch metadata when shared networks are present

[GitBox <gi...@apache.org>]

onitake opened a new issue #3557: cloud-init fails to fetch metadata when shared networks are present
URL: https://github.com/apache/cloudstack/issues/3557
 
 
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   ##### ISSUE TYPE
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    * Bug Report
   
   ##### COMPONENT NAME
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   Categorize the issue, e.g. API, VR, VPN, UI, etc.
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   ~~~
   VR
   metadata
   cloud-init
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   ##### CLOUDSTACK VERSION
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   New line separated list of affected versions, commit ID for issues on master branch.
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   4.11.2
   likely others affected as well
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   ##### CONFIGURATION
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   Information about the configuration if relevant, e.g. basic network, advanced networking, etc.  N/A otherwise
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   Advanced networking, with isolated and shared networks.
   
   ##### OS / ENVIRONMENT
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   Information about the environment if relevant, N/A otherwise
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   CentOS 7, but likely other VM operating systems affected as well.
   
   ##### SUMMARY
   <!-- Explain the problem/feature briefly -->
   As reported here: https://bugs.launchpad.net/cloud-init/+bug/1839854
   
   cloud-init is longer able to fetch metadata on VMs that have both isolated and shared networks attached. In older cloud-init versions (0.7.5), acquiring metadata would still succeed if network manager was used, because cloud-init would then ignore the DHCP lease files and use the default gateway.
   
   The logic in cloud-init is to use the latest created DHCP lease file for obtaining the metadata server IP, but if that is 
   
   ##### STEPS TO REPRODUCE
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   * Deploy a VM that has cloud-init newer than 0.7.5 and attach an isolated and a shared network to the VM
   * Configure cloud-init to use CloudStack metadata
   * Depending on the OS, ensure that the shared network obtains a DHCP lease last
   * Apply metadata to the VM
   
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   ##### EXPECTED RESULTS
   <!-- What did you expect to happen when running the steps above? -->
   * cloud-init obtains and applies metadata on boot
   
   ##### ACTUAL RESULTS
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   * The VM takes much longer to boot than normal,
   * fails to obtain metadata because it isn't offered by the shared network router
   * and doesn't apply metadata to the host
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