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--- en:c2_watchdog_timer [2016/06/07 19:36]
odroid created
+++ en:c2_watchdog_timer [2016/07/14 04:36] (current)
moon.linux [Watchdog demon configuration files]
@@ Line 1: / Line 1: @@
--- Under construction --
+=========Watchdog on Linux/Ubuntu=======
+===== Background ======
+Watchdog timers are commonly found in embedded systems and other computer-controlled equipment where humans cannot easily access the equipment or would be unable to react to faults in a timely manner. In such systems, the computer cannot depend on a human to reboot it if it hangs; it must be self-reliant.
+Odroid C2 support watchdog driver **gxbb_wdt** to control the PMU.
+===== Test Watchdog module =====
+<WRAP center round important 100%>
+Watchdog driver gxbb_wdt is configurable for Odroid C2.
+</WRAP>
+You should be able to see /dev/watchdog and /dev/watchdog0 device files being created.
+<code>
+odroid@odroid64:~$ ls -la /dev/watchdog*
+crw------- 1 root root  10, 130 Feb 11 11:28 /dev/watchdog
+crw------- 1 root root 248,   0 Feb 11 11:28 /dev/watchdog0
+odroid@odroid64:~$
+</code>
+Watchdog daemon will trigger and reboot if we access the device file manually.
+<code>
+root@odroid64:~# echo 3 > /dev/watchdog
+[  186.570231] watchdog watchdog0: watchdog did not stop!
+root@odroid64:~#
+</code>
+To manually stop watchdog to reboot.
+<code>
+# echo V > /dev/watchdog
+</code>
+===== Install Watchdog daemon =====
+To install watchdog daemon
+<code>
+sudo apt-get install watchdog
+</code>
+Create dir for watchdog logs files
+<code>
+sudo mkdir -p /var/log/watchdog
+</code>
+Append the default watchdog configuration.
+**/etc/default/watchdog**
+<code>
+# Start watchdog at boot time? 0 or 1
+run_watchdog=1
+# Start wd_keepalive after stopping watchdog? 0 or 1
+run_wd_keepalive=1
+# Load module before starting watchdog
+watchdog_module=gxbb_wdt
+# Specify additional watchdog options here (see manpage).
+watchdog_options="-s -v -c /etc/watchdog.conf"
+</code>
+===== Watchdog demon configuration files =====
+You need to edit the **/etc/watchdog.conf** file to un-comment and so actually use the **/dev/watchdog** device access to the module. Otherwise the watchdog will not use the hardware and rely only on its internal code to soft-reboot a broken machine.
+<code>
+$ cat /etc/watchdog.conf
+#ping                   = 172.31.14.1
+#ping                   = 172.26.1.255
+#interface              = eth0
+#file                   = /var/log/messages
+#change                 = 1407
+# Uncomment to enable test. Setting one of these values to '0' disables it.
+# These values will hopefully never reboot your machine during normal use
+# (if your machine is really hung, the loadavg will go much higher than 25)
+#max-load-1             = 24
+#max-load-5             = 18
+#max-load-15            = 12
+# Note that this is the number of pages!
+# To get the real size, check how large the pagesize is on your machine.
+#min-memory             = 1
+#repair-binary          = /usr/sbin/repair
+#repair-timeout         =
+#test-binary            =
+#test-timeout           =
+watchdog-device = /dev/watchdog
+# Defaults compiled into the binary
+#temperature-device     =
+#max-temperature        = 120
+# Defaults compiled into the binary
+admin                   = root
+interval                = 1
+logtick                = 1
+log-dir         = /var/log/watchdog
+# This greatly decreases the chance that watchdog won't be scheduled before
+# your machine is really loaded
+realtime                = yes
+priority                = 1
+# Check if rsyslogd is still running by enabling the following line
+pidfile         = /var/run/rsyslogd.pid
+watchdog-timeout        = 15
+</code>
+For more configuration please follow link below.
+[[http://www.sat.dundee.ac.uk/psc/watchdog/watchdog-configure.html]]
+===== Start Watchdog Service and Verify ======
+In order to start service we need to append /etc/rc.local
+<code>
+service watchdog restart
+</code>
+<code>
+root@odroid64:~#
+odroid@odroid64:~$ service watchdog status
+● watchdog.service - watchdog daemon
+   Loaded: loaded (/lib/systemd/system/watchdog.service; static; vendor preset:
+   Active: active (running) since Wed 2016-06-22 01:52:23 EDT; 10s ago
+  Process: 1384 ExecStopPost=/bin/sh -c [ $run_wd_keepalive != 1 ] || false (cod
+  Process: 1959 ExecStart=/bin/sh -c [ $run_watchdog != 1 ] || exec /usr/sbin/wa
+  Process: 1955 ExecStartPre=/bin/sh -c [ -z "${watchdog_module}" ] || [ "${watc
+ Main PID: 1961 (watchdog)
+   CGroup: /system.slice/watchdog.service
+           └─1961 /usr/sbin/watchdog -s -v -c /etc/watchdog.conf
+Jun 22 01:52:30 odroid64 watchdog[1961]: still alive after 6 interval(s)
+Jun 22 01:52:30 odroid64 watchdog[1961]: was able to ping process 483 (/var/run/
+Jun 22 01:52:31 odroid64 watchdog[1961]: still alive after 7 interval(s)
+Jun 22 01:52:31 odroid64 watchdog[1961]: was able to ping process 483 (/var/run/
+Jun 22 01:52:32 odroid64 watchdog[1961]: still alive after 8 interval(s)
+Jun 22 01:52:32 odroid64 watchdog[1961]: was able to ping process 483 (/var/run/
+Jun 22 01:52:33 odroid64 watchdog[1961]: still alive after 9 interval(s)
+Jun 22 01:52:33 odroid64 watchdog[1961]: was able to ping process 483 (/var/run/
+Jun 22 01:52:34 odroid64 watchdog[1961]: still alive after 10 interval(s)
+Jun 22 01:52:34 odroid64 watchdog[1961]: was able to ping process 483 (/var/run/
+lines 1-20/20 (END)
+</code>
+Once the watchdog demon is configures then it tries to continuously try to reset the watchdog timer.
+Another way to test watchdog device is working under watchdog demon.
+<code>
+root@odroid64:~#
+root@odroid64:~# pkill -9 watchdog
+</code>