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Instance Unreachable After Attaching Second Neutron Port

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Problem

After attaching a second Neutron port to an existing instance, the instance becomes unreachable.

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Environment

  • Platform9 Managed OpenStack - All versions

  • Neutron

  • CentOS

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Cause

If the second Neutron network you attached to your OpenStack instance has a default gateway, it will override the instances’ existing default gateway.

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Resolution

  1. Run the following command to use the gateway device from the first Neutron port.

# echo 'GATEWAYDEV=eth0' >> /etc/sysconfig/network

  1. Restart the instance if the network connectivity is not restored.

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