Scenario

Log rotation has stopped working correctly, and you suspect that /var/log might be mounted on a different filesystem with limited space or incorrect mount options.

Task

Determine which filesystem or device /var/log is mounted on, including device name, mount point, filesystem type, size, and usage. Ensure all sizes are formatted in human-readable units (e.g., GB, MB). Save the findings to /home/devops/varlog_filesystem_info.txt Optionally identify if this filesystem differs from / which could provide additional info on causes of log rotation or space issues.

Example

# After (filesystem identified and analyzed)

Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb1       10G   9.8G  200M  98% /var/log

Mount details:
/dev/sdb1 on /var/log type ext4 (rw,relatime)

Step 1: Check which filesystem /var/log is mounted on

df -h /var/log

Shows the device, size, usage, and mount point.

Step 2: Get detailed mount information

findmnt /var/log

Shows filesystem type and mount options like ro (read-only) or noexec that could prevent log rotation.

Step 3: Save filesystem information to report file

df -h /var/log > /home/devops/varlog_filesystem_info.txt
findmnt /var/log >> /home/devops/varlog_filesystem_info.txt

df -h / /var/log >> /home/devops/varlog_filesystem_info.txt