Skip to content

Troubleshooting / Occupying a Large Amount of Host Disk Space After Installation

In some cases, if the minimum system requirements for overlay2 are not met (Linux kernel 4.0+ or RHEL/CentOS version 3.10.0-514+), Docker will default 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, this may lead to the disk being filled up after startup, preventing DataFlux Func from running.

1. Confirm Linux / CentOS Version

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

Bash
1
2
3
4
5
# Linux kernel version
uname -a

# CentOS distribution 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:

Bash
1
sudo docker info

The output is as follows:

3. Known Operating Systems with Issues

Currently known operating systems where this situation may occur include:

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