Why the script can't be executed at stop?

Question

The three lines can run.

debian8@hwy:~$ trafficlog="/var/log/traffic.log"
debian8@hwy:~$ echo  `date "+%Y-%m-%d %H:%M:%S  "` |  sudo tee -a  $trafficlog    
2017-02-04 21:20:41
debian8@hwy:~$ sudo iptables  -v -L INPUT |grep Chain  |  sudo tee -a  $trafficlog
Chain INPUT (policy ACCEPT 122 packets, 28381 bytes)

Let me check it.

debian8@hwy:~$ cat  /var/log/traffic.log
2017-02-04 21:20:41
Chain INPUT (policy ACCEPT 122 packets, 28381 bytes)

Now to make it run at the runlevel6 on my debian8.

sudo vim /etc/init.d/K99trafficLog.sh
#!/bin/bash
trafficlog="/var/log/traffic.log"
echo  `date "+%Y-%m-%d %H:%M:%S  "` |  sudo tee -a  $trafficlog
sudo iptables  -v -L INPUT |grep Chain  |  sudo tee -a  $trafficlog

sudo chmod +x /etc/init.d/K99trafficLog.sh
sudo ln -s /etc/init.d/K99trafficLog.sh  /etc/rc6.d/K99trafficLog

Now to test it.

echo "" | sudo tee /var/log/traffic.log

Then to reboot to verify.

sudo cat /var/log/traffic.log

It is unlucky that nothing written into /var/log/traffic.log,why?

echo \...`` makes no sense at all. – michas Feb 04 '17 at 13:42 — michas, Feb 04 '17 at 13:42

michas · Answer 1 · 2017-02-04T14:19:07.200

Those init scripts are run as root. Therefore you don't need all those sudo/tee hacks:

#!/bin/bash
exec >/var/log/traffic.log
date "+%Y-%m-%d %H:%M:%S  "
iptables -v -L INPUT |grep Chain

Also be aware that /etc/rc*.d/K* is run on leaving runlevel, while /etc/rc*.d/S* is run on entering runlevel.

Be aware that runlevel 6 is special. Entering that runlevel makes your system reboot, therefore you never actually leave that level.

You can always manually debug your script using sudo bash -x /etc/rc6.d/K99trafficLog.

Also be aware that current debian systems use systemd for managing services. Please read about about systemd which handles things different than old runlevel based approaches.

To change your lines can't solve the issue. – showkey Feb 04 '17 at 14:05 — showkey, Feb 04 '17 at 14:05

score 0 · Answer 2 · edited Feb 05 '17 at 14:12

sudo vim /etc/systemd/system/graphical.target.wants/Ktraffic.service

[Unit]
Description=Record net traffic

[Service]
Type=oneshot
ExecStart=/bin/bash   /etc/init.d/K01trafficLog.sh

[Install]
WantedBy=poweroff.target

sudo vim /etc/init.d/K011trafficLog.sh

#!/bin/bash
trafficlog="/var/log/traffic.log"
date "+%Y-%m-%d %H:%M:%S  "         >> $trafficlog
iptables  -v -L INPUT |grep Chain   >> $trafficlog

systemctl enable ktraffic.service

Why the script can't be executed at stop?

2 Answers2