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Troubleshooting / Excessive Host Disk Usage After Installation

In some cases, due to not meeting the minimum system requirements for overlay2 (Linux 4.0+ kernel, or RHEL/CentOS version 3.10.0-514+), Docker defaults to using the non-union filesystem vfs as the storage engine.

Since vfs occupies a large amount of disk space, for servers with limited disk capacity, it may result in the disk space being fully occupied after startup, causing DataFlux Func to be unable to run.

1. Confirm Linux / CentOS Version

You can confirm the Linux kernel / CentOS version using the following commands:

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# Linux kernel version
uname -a

# CentOS release version
cat /etc/redhat-release

The output is as follows:

2. Confirm Docker's Current Storage Engine

You can confirm the storage engine currently used by Docker with the following command:

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sudo docker info

The output is as follows:

3. Known Problematic Operating Systems

Currently, the following operating systems are known to potentially encounter this issue:

  • CentOS 7.2 original version (The CentOS 7.2 provided by Alibaba Cloud platform has an upgraded kernel and can be installed normally)