As well as auditing the normal Linux file system and system calls, you should also audit all Docker related files and directories. The Docker daemon runs with root privileges and its behaviour depends on some key files and directories. /var/lib/docker is one such directory. As it holds all the information about containers it should be audited.
Auditing can generate large log files. You should ensure that these are rotated and archived periodically. A separate partition should also be created for audit logs to avoid filling up any other critical partition.
SolutionYou should add a rule for the /var/lib/docker directory.
Add the line as below to the /etc/audit/rules.d/audit.rules file:
-a exit,always -F path=/var/lib/docker -F perm=war -k docker
Then, restart the audit daemon using the following command
systemctl restart auditd
By default, Docker related files and directories are not audited.