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Creating and Accessing Instances
Binding failed for port
When creating an instance through the dashboard, it starts to create the instance, but then fails with the following error message in the top right corner:
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Error: Failed to perform requested operation on instance "<instance_name>", the instance has an error status: Please try again later [Error: Exceeded maximum number of retries. Exceeded max scheduling attempts 3 for instance <instance_id>. Last exception: Binding failed for port <port_id>, please check neutron logs for more information.]. |
This usually means that you have attempted to to set "public external" as the primary network for your instance. This will always fail, as you should be using a private network for all of your instances (which you have to set up before creating any instances). For information on setting up a private network (and a virtual router for external access), please refer to Nimbus - Launching an Instance
SSH Access - permission denied
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There may be a number of possible reasons for this:
- First, ensure Ensure that you have added your SSH key (either by generating a new key in the dashboard, or importing an existing one).Second, make
- Ensure that you are using the correct username for the image you chose for your instance, e.g. ubuntu for Ubuntu images or centos for Centos images.
- Make sure that you have set up a security group to allow SSH access into your instance. For more information on this, refer to Nimbus - Launching an Instanceour training material and the security group section in particular.
- Ensure that your SSH key on the machine you are connecting from has suitable permissions set. In particular, make sure that the private key can only be read by your personal account, and no-one else (the SSH key filename in the example below may differ, depending on your setup):
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Accessing Recovery Mode
If your VM instance fails to boot or there is some other critical issue with your instance (e.g. due to system misconfiguration), it is possible to access recovery mode in Ubuntu systems. Although the instructions below are given for Ubuntu's recovery mode, the procedure is similar for accessing the emergency mode on CentOS systems.
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The recovery and emergency modes are advanced features intended for users experienced with Linux systems. If you are unfamiliar with the system, we recommend using alternative means to recover your VMinstance, such as rolling back to an earlier snapshot or mounting your root volume to a new instance. Please contact help@pawsey.org.au for more assistance. |
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