block_size parameter for dd (#719)

removed log

Signed-off-by: Tullio Sebastiani <tsebasti@redhat.com>

docs/SLOs_validation.md

@@ -38,11 +38,11 @@ A couple of [alert profiles](https://github.com/redhat-chaos/krkn/tree/main/conf
   severity: critical
 ```
 
-Kube-burner supports setting the severity for the alerts with each one having different effects:
+Krkn supports setting the severity for the alerts with each one having different effects:
 
 ```
 info: Prints an info message with the alarm description to stdout. By default all expressions have this severity.
 warning: Prints a warning message with the alarm description to stdout.
-error: Prints a error message with the alarm description to stdout and makes kube-burner rc = 1
+error: Prints a error message with the alarm description to stdout and sets Krkn rc = 1
 critical: Prints a fatal message with the alarm description to stdout and exits execution inmediatly with rc != 0
 ```

docs/index.md

@@ -11,7 +11,7 @@
 * [Scenarios](#scenarios)
 * [Test Environment Recommendations - how and where to run chaos tests](#test-environment-recommendations---how-and-where-to-run-chaos-tests)
 * [Chaos testing in Practice](#chaos-testing-in-practice)
-  * [OpenShift oraganization](#openshift-organization)
+  * [OpenShift organization](#openshift-organization)
   * [startx-lab](#startx-lab)
 
 

krkn/scenario_plugins/pvc/pvc_scenario_plugin.py

@@ -29,6 +29,9 @@ class PvcScenarioPlugin(AbstractScenarioPlugin):
                 pvc_name = get_yaml_item_value(scenario_config, "pvc_name", "")
                 pod_name = get_yaml_item_value(scenario_config, "pod_name", "")
                 namespace = get_yaml_item_value(scenario_config, "namespace", "")
+                block_size = get_yaml_item_value(
+                    scenario_config, "block_size", "102400"
+                )
                 target_fill_percentage = get_yaml_item_value(
                     scenario_config, "fill_percentage", "50"
                 )
@@ -197,10 +200,12 @@ class PvcScenarioPlugin(AbstractScenarioPlugin):
                         str(full_path),
                     )
                 elif dd is not None:
+                    block_size = int(block_size)
+                    blocks = int(file_size_kb / int(block_size / 1024))
                     logging.warning(
                         "fallocate not found, using dd, it may take longer based on the amount of data, please wait..."
                     )
-                    command = f"dd if=/dev/urandom of={str(full_path)} bs=1024 count={str(file_size_kb)} oflag=direct"
+                    command = f"dd if=/dev/urandom of={str(full_path)} bs={str(block_size)} count={str(blocks)} oflag=direct"
                 else:
                     logging.error(
                         "failed to locate required binaries fallocate or dd to execute the scenario"
@@ -241,45 +246,6 @@ class PvcScenarioPlugin(AbstractScenarioPlugin):
                     )
                     return 1
 
-            # Calculate file size
-            file_size_kb = int(
-                (float(target_fill_percentage / 100) * float(pvc_capacity_kb))
-                - float(pvc_used_kb)
-            )
-            logging.debug("File size: %s KB" % file_size_kb)
-
-            file_name = "kraken.tmp"
-            logging.info(
-                "Creating %s file, %s KB size, in pod %s at %s (ns %s)"
-                % (
-                    str(file_name),
-                    str(file_size_kb),
-                    str(pod_name),
-                    str(mount_path),
-                    str(namespace),
-                )
-            )
-
-            start_time = int(time.time())
-            # Create temp file in the PVC
-            full_path = "%s/%s" % (str(mount_path), str(file_name))
-            command = "fallocate -l $((%s*1024)) %s" % (
-                str(file_size_kb),
-                str(full_path),
-            )
-            logging.debug("Create temp file in the PVC command:\n %s" % command)
-            lib_telemetry.get_lib_kubernetes().exec_cmd_in_pod(
-                [command], pod_name, namespace, container_name
-            )
-
-            # Check if file is created
-            command = "ls -lh %s" % (str(mount_path))
-            logging.debug("Check file is created command:\n %s" % command)
-            response = lib_telemetry.get_lib_kubernetes().exec_cmd_in_pod(
-                [command], pod_name, namespace, container_name
-            )
-            logging.info("\n" + str(response))
-            if str(file_name).lower() in str(response).lower():
                 logging.info(
                     "Waiting for the specified duration in the config: %ss" % duration
                 )

run_kraken.py

@@ -627,7 +627,7 @@ if __name__ == "__main__":
         junit_testcase_xml = get_junit_test_case(
             success=True if retval == 0 else False,
             time=int(junit_endtime - junit_start_time),
-            test_suite_name="krkn-test-suite",
+            test_suite_name="chaos-krkn",
             test_case_description=options.junit_testcase,
             test_stdout=tee_handler.get_output(),
             test_version=options.junit_testcase_version,

scenarios/openshift/pvc_scenario.yaml

@@ -4,3 +4,4 @@ pvc_scenario:
   namespace: <namespace_name>   # Namespace where the PVC is
   fill_percentage: 50           # Target percentage to fill up the cluster, value must be higher than current percentage, valid values are between 0 and 99
   duration: 60                  # Duration in seconds for the fault
+  block_size: 102400            # used only by dd if fallocate not present in the container