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Troubleshooting / Installation Consumes Large Amounts of Host Disk Space

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

Since vfs consumes a large amount of disk space, servers with limited disk capacity may experience full disk usage after startup, causing DataFlux Func to fail to run.

1. Confirm Linux / CentOS Version

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

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# Linux kernel version
uname -a

# CentOS release version
cat /etc/redhat-release

Output is as follows:

2. Confirm Current Docker Storage Engine

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

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sudo docker info

Output is as follows:

3. Operating Systems Known to Have Issues

The operating systems known to potentially cause this issue are:

  • Original CentOS 7.2 (CentOS 7.2 provided by Alibaba Cloud has upgraded its kernel and can be installed normally)