[rsyslog]Setting log file size to 16Mb (#9504)

Why I did it
The existing log file size in sonic is 1 Mb. Over a period of time this leads to huge number of log files which becomes difficult for monitoring applications to handle.
Instead of large number of small files, the size of the log file is not set to 16 Mb which reduces the number of files over a period of time.

How I did it
Changed the size parameter and related macros in logrotate config for rsyslog

How to verify it
Execute logrotate manually and verify the limit when the file gets rotated.

Signed-off-by: Sudharsan Dhamal Gopalarathnam <sudharsand@nvidia.com>

files/build_templates/sonic_debian_extension.j2

@@ -377,6 +377,10 @@ echo "system-health.service" | sudo tee -a $GENERATED_SERVICE_FILE
 
 # Copy logrotate.d configuration files
 sudo cp -f $IMAGE_CONFIGS/logrotate/logrotate.d/* $FILESYSTEM_ROOT/etc/logrotate.d/
+sudo cp $IMAGE_CONFIGS/logrotate/rsyslog.j2 $FILESYSTEM_ROOT_USR_SHARE_SONIC_TEMPLATES/
+sudo cp $IMAGE_CONFIGS/logrotate/logrotate-config.service $FILESYSTEM_ROOT_USR_LIB_SYSTEMD_SYSTEM
+sudo cp $IMAGE_CONFIGS/logrotate/logrotate-config.sh $FILESYSTEM_ROOT/usr/bin/
+echo "logrotate-config.service" | sudo tee -a $GENERATED_SERVICE_FILE
 
 # Copy systemd-journald configuration files
 sudo cp -f $IMAGE_CONFIGS/systemd/journald.conf $FILESYSTEM_ROOT/etc/systemd/

files/image_config/logrotate/logrotate-config.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Update logrotate configuration
+Requires=updategraph.service
+After=updategraph.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/logrotate-config.sh
+
+[Install]
+WantedBy=multi-user.target
+

files/image_config/logrotate/logrotate-config.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+sonic-cfggen -d -t  /usr/share/sonic/templates/rsyslog.j2 -a "{\"var_log_kb\":$(df -k /var/log | sed -n 2p | awk '{ print $2 }') }" > /etc/logrotate.d/rsyslog
+

files/image_config/logrotate/logrotate.d/rsyslog → files/image_config/logrotate/rsyslog.j2

@@ -35,7 +35,11 @@
 /var/log/swss/swss*.rec
 /var/log/swss/responsepublisher.rec
 {
+{% if var_log_kb <= 204800 %}
     size 1M
+{% else %}
+    size 16M
+{% endif %}
     rotate 5000
     missingok
     notifempty
@@ -53,7 +57,7 @@
         # should be disabled, just in case they get created and rotated
         RESERVED_SPACE_KB=4096
 
-        VAR_LOG_SIZE_KB=$(df -k /var/log | sed -n 2p | awk '{ print $2 }')
+        VARL_LOG_SIZE_KB={{var_log_kb}}
 
         # Limit usable space to 90% of the partition minus the reserved space for other logs
         USABLE_SPACE_KB=$(( (VAR_LOG_SIZE_KB * 90 / 100) - RESERVED_SPACE_KB))