bugfixe and doc for log2ram

Author: hallard

1_Pi_Config.sh

@@ -115,7 +115,7 @@ if [[ "$REPLY" =~ ^(yes|y|Y)$ ]]; then
 	dpkg-reconfigure tzdata
 fi
 
-if [[ ! -f /usr/local/bin/ram2disk ]]; then
+if [[ ! -f /usr/local/bin/log2ram ]]; then
 	echo -n "Do you want to enable log2ram [y/N] "
 	read
 	if [[ "$REPLY" =~ ^(yes|y|Y)$ ]]; then
@@ -124,7 +124,18 @@ if [[ ! -f /usr/local/bin/ram2disk ]]; then
 		cd log2ram
 		chmod +x install.sh uninstall.sh
 		./install.sh
-		ln -s /usr/local/bin/ram2disk /etc/cron.hourly/
+		ln -s /usr/local/bin/log2ram /etc/cron.hourly/
+		echo "cleaning up log rotation"
+		replace /etc/logrotage.d/rsyslog "^.*daily.*$" "    hourly"
+		replace /etc/logrotage.d/rsyslog "^.*monthly.*$" "    daily"
+		replace /etc/logrotage.d/rsyslog "^.*delaycompress.*$" "  "
+
+		echo "forcing one log rotation"
+		logrotate /etc/logrotate.conf
+		echo "Please don't forget to adjust the logrotate"
+		echo "paratemeters in /etc/logrotage.d/* to avoid"
+		echo "filling up the ramdisk, see README in"
+		echo "https://github.com/ch2i/LoraGW-Setup/"
 		echo ""
 	fi
 fi

README.md

@@ -293,6 +293,59 @@ sudo systemctl stop loragw
 sudo systemctl start loragw
 ```
 
+## Adjust log2ram
+
+if you chose log2ram to reduce SD card write, you need to change some log file rotation to avoid RAM Disk to be full.
+
+For this you need to edit each file in `/etc/logrotate.d/`, and on each file:
+
+- remove line(s) containing `delaycompress` (this avoid uncompressed old log)
+- change line(s) containing `rotate n` by rotate 12 (this this the max log file history)
+- change line(s) containing `daily` by `hourly` (rotate log each hour)
+- change line(s) containing `monthly` by `daily` (rotate log each day)
+
+In this case we got last 12H with 1 file per hour. Of course, you can adjust these paramaters to feet you need, it's just an example, 
+
+file `/etc/logrotate.d/rsyslog`
+
+```
+/var/log/syslog
+{
+        rotate 12
+        hourly
+        missingok
+        notifempty
+        compress
+        postrotate
+        invoke-rc.d rsyslog rotate > /dev/null
+        endscript
+}
+
+/var/log/mail.info
+/var/log/mail.warn
+/var/log/mail.err
+/var/log/mail.log
+/var/log/daemon.log
+/var/log/kern.log
+/var/log/auth.log
+/var/log/user.log
+/var/log/lpr.log
+/var/log/cron.log
+/var/log/debug
+/var/log/messages
+{
+        rotate 12
+        hourly
+        missingok
+        notifempty
+        compress
+        sharedscripts
+        postrotate
+        invoke-rc.d rsyslog rotate > /dev/null
+        endscript
+}
+
+``` 
 
 # And here is the final result