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この文書の現在のバージョンと選択したバージョンの差分を表示します。

--- mae3xx_devel:use_wdt:start [2016/07/20 11:30]
admin
+++ mae3xx_devel:use_wdt:start [2017/07/12 16:51] (現在)
admin [有効化]
@@ ライン 1: / ライン 1: @@
+====== WatchDog Timer による監視 ======
+MA-E3xx シリーズでは、Hardware Watchdog Timer driver を組み込んでいます。\\
+watchdog パッケージにより、簡単な設定で Watchdog Timer を利用することができます。
+<code>
+root@plum:~# dpkg -l watchdog|cat
+Desired=Unknown/Install/Remove/Purge/Hold
+| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
+|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
+||/ Name                                  Version                          Architecture Description
++++-=====================================-================================-============-=============================================================
+ii  watchdog                              5.13-1                           armhf        system health checker and software/hardware watchdog handler
+</code>
+\\
+===== 設定 =====
+==== 有効化 ====
+=== daemon 起動の設定 ===
+有効化するために、/etc/default/watchdog ファイルを編集します。
+<code>
+root@plum:~# nano -w /etc/default/watchdog
+</code>
+<file conf watchdog>
+# Start watchdog at boot time? 0 or 1
+run_watchdog=1
+# Load module before starting watchdog
+watchdog_module="none"
+# Specify additional watchdog options here (see manpage).
+</file>
+run_watchdog を 1 にします。
+\\
+=== 設定ファイルの編集 ===
+/etc/watchdog.conf を編集します。
+<file 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
+</file>
+\\
+変更点
+<code>
+root@plum:~# diff -u /ro/etc/watchdog.conf /etc/watchdog.conf
+--- /ro/etc/watchdog.conf	2013-02-01 20:15:44.000000000 +0900
++++ /etc/watchdog.conf	2017-07-12 16:48:04.731702357 +0900
+@@ -20,7 +20,7 @@
+ #test-binary		=
+ #test-timeout		=
+-#watchdog-device	= /dev/watchdog
++watchdog-device	= /dev/watchdog
+ # Defaults compiled into the binary
+ #temperature-device	=
+</code>
+\\
+==== 自動起動設定 ====
+MA-E3xx の起動時に自動で実行するように設定します。
+<code>
+root@plum:~# update-rc.d watchdog enable
+update-rc.d: warning:  start runlevel arguments (none) do not match watchdog Default-Start values (2 3 4 5)
+update-rc.d: warning:  stop runlevel arguments (none) do not match watchdog Default-Stop values (0 1 6)
+ Enabling system startup links for /etc/init.d/watchdog ...
+ Removing any system startup links for /etc/init.d/watchdog ...
+   /etc/rc0.d/K11watchdog
+   /etc/rc1.d/K11watchdog
+   /etc/rc2.d/S89watchdog
+   /etc/rc3.d/S89watchdog
+   /etc/rc4.d/S89watchdog
+   /etc/rc5.d/S89watchdog
+   /etc/rc6.d/K11watchdog
+ Adding system startup for /etc/init.d/watchdog ...
+   /etc/rc0.d/K11watchdog -> ../init.d/watchdog
+   /etc/rc1.d/K11watchdog -> ../init.d/watchdog
+   /etc/rc6.d/K11watchdog -> ../init.d/watchdog
+   /etc/rc2.d/S89watchdog -> ../init.d/watchdog
+   /etc/rc3.d/S89watchdog -> ../init.d/watchdog
+   /etc/rc4.d/S89watchdog -> ../init.d/watchdog
+   /etc/rc5.d/S89watchdog -> ../init.d/watchdog
+root@plum:~#
+</code>
+<code>
+root@plum:~# ls /etc/rc2.d/
+K59apcupsd  S09wd_keepalive  S20ddclient   S20redis-server  S70dns-clean  S89watchdog
+K80hostapd  S15dnsmasq       S20firewalld  S20smstools      S70pppd-dns   S99rc.local
+README      S19cpufrequtils  S20nginx      S23ntp           S75sudo
+root@plum:~#
+</code>
+S89watchdog の symbolic link が作られていることが確認できます。
+\\
+==== (手動での)起動 ====
+起動させてみます。
+<code>
+root@plum:~# /etc/init.d/watchdog start
+ * Stopping watchdog keepalive daemon...                                                               [ OK ]
+ * Starting watchdog daemon...                                                                         [ OK ]
+root@plum:~#
+</code>
+syslog に下記のように出力され、watchdog daemon が起動したことが確認できます。
+<code>
+Jul 20 11:26:57 plum watchdog[11594]: stopping daemon (5.13)
+Jul 20 11:27:02 plum wd_keepalive[11750]: starting watchdog keepalive daemon (5.13):
+Jul 20 11:27:02 plum wd_keepalive[11750]:  int=10 alive=/dev/watchdog realtime=yes
+Jul 20 11:27:02 plum wd_keepalive[11750]: hardware watchdog identity: OMAP Watchdog
+</code>

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