{"id":1090,"date":"2016-01-30T21:38:55","date_gmt":"2016-01-30T12:38:55","guid":{"rendered":"http:\/\/matoken.org\/blog\/?p=1090"},"modified":"2016-01-30T21:38:55","modified_gmt":"2016-01-30T12:38:55","slug":"setting-the-watchdog-in-raspbian-jessie","status":"publish","type":"post","link":"https:\/\/matoken.org\/blog\/2016\/01\/30\/setting-the-watchdog-in-raspbian-jessie\/","title":{"rendered":"Rasbian jessie \u3067 watchdog \u3092\u8a2d\u5b9a\u3059\u308b"},"content":{"rendered":"

<\/p>\n

Rasbian jessie \u74b0\u5883\u3067\u3082\u8a2d\u5b9a\u3057\u305f\u306e\u3067\u30e1\u30e2\u3068\u3057\u3066\uff0e<\/p>\n

\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u5c0e\u5165<\/h2>\n
$ sudo apt install watchdog<\/span><\/span><\/span><\/div><\/pre>\n
\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u4fee\u6b63<\/h2>\n
\/etc\/watchdog.conf<\/code> \u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u7de8\u96c6<\/p>\n
-#min-memory              = 1<\/span><\/span><\/span><\/div>
+min-memory              = 5000<\/span><\/span><\/span><\/div>
 <\/span><\/span><\/div>
-#watchdog-device       = \/dev\/watchdog<\/span><\/span><\/span><\/div>
+watchdog-device        = \/dev\/watchdog<\/span><\/span><\/span><\/div><\/pre>\n
min-memory<\/code> \u306f\u30da\u30fc\u30b8\u30b5\u30a4\u30ba\uff0e\u4eca\u56de\u306f4096*5000\u3067\u7d0420MB\uff0e\u3053\u306e\u30b5\u30a4\u30ba(swap\u3092\u542b\u3081\u305f\u5bb9\u91cf)\u3092\u5207\u3063\u305f\u3089\u518d\u8d77\u52d5\u3059\u308b\u306f\u305a\uff0e\u5927\u304d\u3044\u3088\u3046\u306a\u6c17\u3082\u3059\u308b\u3051\u3069\u307e\u305a\u306f\u52d5\u4f5c\u78ba\u8a8d\u306e\u305f\u3081\u306b\u3053\u306e\u304f\u3089\u3044\u306b\u3057\u3066\u307f\u308b\uff0e<\/p>\n
\/etc\/default\/watchdog<\/code> \u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u611f\u3058\u306b\u7de8\u96c6\u3057\u3066 bcm2708_wdog<\/code> \u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u8aad\u307f\u3053\u3080\u3088\u3046\u306b\u3059\u308b\uff0e<\/p>\n
-watchdog_module="none"<\/span><\/span><\/span><\/div>
+watchdog_module="bcm2708_wdog"<\/span><\/span><\/span><\/div><\/pre>\n
\u8d77\u52d5\u8a2d\u5b9a<\/h2>\n
$ sudo update-rc.d watchdog defaults<\/span><\/span><\/span><\/div>
$ sudo update-rc.d watchdog enable<\/span><\/span><\/span><\/div><\/pre>\n
\u52d5\u4f5c\u78ba\u8a8d<\/h2>\n
\u518d\u8d77\u52d5\u3057\u3066<\/p>\n
$ sudo reboot<\/span><\/span><\/span><\/div><\/pre>\n
\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u8aad\u307f\u8fbc\u307f\uff0c\u30c7\u30d0\u30a4\u30b9\u306e\u78ba\u8a8d\uff0c\u30c7\u30fc\u30e2\u30f3\u306e\u78ba\u8a8d\u3092\u3059\u308b\uff0e<\/p>\n
$ lsmod|grep dog<\/span><\/span><\/span><\/div>
bcm2708_wdog            3926  1<\/span><\/span><\/span><\/div>
$ ls -l \/dev\/watchdog<\/span><\/span><\/span><\/div>
crw------- 1 root root 10, 130  1\u6708 26 23:32 \/dev\/watchdog<\/span><\/span><\/span><\/div>
$ ps -ef|grep dog<\/span><\/span><\/span><\/div>
root       642     1  0 23:32 ?        00:00:00 \/usr\/sbin\/watchdog<\/span><\/span><\/span><\/div><\/pre>\n
\u554f\u984c\u7121\u3055\u305d\u3046\u306a\u3089 swap \u3092\u7121\u52b9\u306b\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u3092 read only \u3084 sync \u3092\u6709\u52b9\u306b\u3057\u3066\u304a\u3044\u3066\u304b\u3089 Forkbomb \u3067\u52d5\u4f5c\u78ba\u8a8d\u3092\u3057\u3066\u307f\u308b\uff0e\u4ee5\u4e0b\u306e\u4f8b\u3067\u306fbash\u3067\u306eForkbomb<\/p>\n
$ sudo swapoff -a<\/span><\/span><\/span><\/div>
$ sync<\/span><\/span><\/span><\/div>
$ sudo mount -o remount,ro \/boot<\/span><\/span><\/span><\/div>
$ sudo mount -o remount,sync \/<\/span><\/span><\/span><\/div>
$ :(){ :|:& };:<\/span><\/span><\/span><\/div><\/pre>\n
\u3046\u307e\u304f\u518d\u8d77\u52d5\u304c\u8d70\u3063\u305f\u3089\u5f8c\u306f \/etc\/watchdog.conf<\/code> \u3092\u8a70\u3081\u3066\u3044\u304f\ufeff\uff0e<\/p>\n