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Problem

The appliance is down, The reason is the disk is full on the appliance.

Reproduction/Solution

From the appliance, Run the df command to to initially check space on appliance disk looking for usage at or close to 100%

# This check the file system usage (-h just means use 1024 as the divisor for space i.e. 1K = 2024 bytes, 1Mb = 1024K etc.). 
df -h

Usage of 100% is blocking appliance stack starting

# Check if the stack can start 
sudo /opt/docker/start-appliance-stack.sh

The appliance stack cannot start.

To establish the largest directories to identify the are where all disk is consumed, run the following:

# This check the  /opt directory. 
sudo du -a /opt/ 2>/dev/null | sort -n -r | head -n 20

This main cause seems to be at a root level so identify the main targets of use

# Check disk usage command (du) at the root level
du -a / | sort -n -r | head -n 5

remember o check other locations as well

Clearing the Syslog will resolve the issue. 

# Force removal of all teh syslog files and any subfolders. Note: use rm command with care.
sudo rm -rf  /var/log/syslog*
# reboot appliance
sudo shutdown -r now

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