Force save logs before making disk read-only

tests/tacacs/test_ro_disk.py

@@ -5,14 +5,12 @@
 import time
 from pkg_resources import parse_version
 
-from tests.common.plugins.loganalyzer.loganalyzer import LogAnalyzer
 from tests.common.utilities import wait_until
 from tests.common.utilities import skip_release
 from tests.common.utilities import wait
 from .test_ro_user import ssh_remote_run
 
 pytestmark = [
-    pytest.mark.disable_loganalyzer,
     pytest.mark.topology('any')
 ]
 
@@ -96,6 +94,16 @@ def test_ro_disk(localhost, duthosts, enum_rand_one_per_hwsku_hostname, creds_al
 
         assert ret, "Failed to ssh as rw user"
 
+        # Force a log rotate to get logs so far recorded.
+        # The read-only state and follow up reboot could wipe off current logs
+        #
+        logging.info("test_ro_disk: Flushing & log rotating to save logs so far")
+        duthost.shell("logger -p local0.notice 'test_ro_disk: Initiating log rotate'")
+        duthost.shell("pkill -HUP rsyslogd")    # To flush logs from daemon to file
+        time.sleep(30)                          # Give a pause before rotate
+        duthost.shell("/usr/sbin/logrotate -f /etc/logrotate.conf > /dev/null 2>&1")
+        time.sleep(30)                          # Pause before making disk RO
+
         # Set disk in RO state
         simulate_ro(duthost)