树莓派安装看门狗

1. 输入以下命令
   sudo apt-get update
   sudo apt-get upgrade
2. 安装watchdog软件
   sudo apt-get install watchdog
3. 修改文件
   sudo nano /lib/systemd/system/watchdog.service
   #追加以下内容
   WantedBy=multi-user.target
4. 设置watchdog开机启动
   sudo update-rc.d watchdog enable
5. 启动树莓派CPU看门狗模块
   sudo modprobe bcm2835_wdt (以前版本为modprobe bcm2708_wdog）
6. 修改watchdog配置文件
   sudo nano /etc/watchdog.conf
   做如下修改
   #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
   #allocatable-memory = 1
   #repair-binary = /usr/sbin/repair
   #repair-timeout =
   #test-binary =
   #test-timeout =
   watchdog-device = /dev/watchdog　　
   watchdog-timeout = 10 这是添加的
   # 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
7. 该处不需要做修改，以前版本需要修改
   sudo nano /etc/default/watchdog
   该文件中的watchdog_module 字段的值不需要修改为bcm2835_wdt，不需要修改
8. 重启主机
   sudo reboot
9. 输入以下内容测试主机是否会重启
   :(){ :|:& };: