Linux Foundation CKS Exam - Topic 1 Question 25 Discussion

Question

You must complete this task on the following cluster/nodes:Cluster:traceMaster node:masterWorker node:worker1You can switch the cluster/configuration context using the following command:[desk@cli] $kubectl config use-context traceGiven: You may use Sysdig or Falco documentation.Task:Use detection tools to detect anomalies like processes spawning and executing something weird frequently in the single container belonging to Podtomcat.Two tools are available to use:1.  falco2. sysdigTools are pre-installed on the worker1 node only.Analyse the container's behaviour for at least 40 seconds, using filters that detect newly spawning and executing processes.Store an incident file at/home/cert_masters/report, in the following format:[timestamp],[uid],[processName]Note:Make sure to store incident file on the cluster's worker node, don't move it to master node.

Nu · Accepted Answer

A) Explanation:
$vim /etc/falco/falco_rules.local.yaml
- rule: Container Drift Detected (open+create)
desc: New executable created in a container due to open+create
condition: >
evt.type in (open,openat,creat) and
evt.is_open_exec=true and
container and
not runc_writing_exec_fifo and
not runc_writing_var_lib_docker and
not user_known_container_drift_activities and
evt.rawres>=0
output: >
%evt.time,%user.uid,%proc.name                # Add this/Refer falco documentation
priority: ERROR
$kill -1 <PID of falco>
Explanation
[desk@cli] $ssh node01
[node01@cli] $vim /etc/falco/falco_rules.yaml
search for Container Drift Detected & paste in falco_rules.local.yaml
[node01@cli] $vim /etc/falco/falco_rules.local.yaml
- rule: Container Drift Detected (open+create)
desc: New executable created in a container due to open+create
condition: >
evt.type in (open,openat,creat) and
evt.is_open_exec=true and
container and
not runc_writing_exec_fifo and
not runc_writing_var_lib_docker and
not user_known_container_drift_activities and
evt.rawres>=0
output: >
%evt.time,%user.uid,%proc.name                # Add this/Refer falco documentation
priority: ERROR
[node01@cli] $vim /etc/falco/falco.yaml

Linux Foundation CKS Exam - Topic 1 Question 25 Discussion

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