Error Initializing Docker: "graphdriver: expected integer"

Problem

Docker fails to start with the following error message.

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Error starting daemon: error initializing graphdriver: expected integer

Environment

• Platform9 Managed Kubernetes - All Versions
• Docker
• CentOS
• LVM

Cause

The node may have been re-used from a previous Kubernetes cluster for which the Docker volume group (LVM) was not recreated.

Resolution

Warning: The following will erase any data associated with the logical volume(s) contained within the volume group. If you are uncertain about this operation, it may be recommended to perform a backup following the guide provided under the Additional Information section.

1. Remove any logical volumes associated with the volume group.

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# lvremove [vg-name]/[lv-name]

2. Remove the volume group.

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# vgremove [vg-name]

3. Re-create the volume group following the instructions outlined in the Platform9 Managed Kubernetes CentOS prerequisites.

Additional Information

LVM: Taking a Backup Using Snapshots