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I want to run a script on startup that establishes a GRE tunnel. The script works fine if I just run /root/tunnel.sh after rebooting, it runs and establishes the tunnel. Below are the contents of my crontab -e for root user on my machine. 

@reboot sleep 15; /root/tunnel.sh

Am I missing something?

I'm running CentOS 7 if that helps.

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    Start by adding logging like this @reboot sleep 15; /root/tunnel.sh >> /tmp/some.log 2>&1 reading that log will give you a clue – Tagwint Mar 22 '18 at 18:17
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    does /root/tunnel.sh rely on any shell variables (or activities) performed by your login shell? Is the correct she-bang line at the top of it? – Jeff Schaller♦ Mar 22 '18 at 18:20
  • You're not mentioning what happens when the cronjob runs. Do you get an email with any error messages from the cron daemon? – Kusalananda♦ Mar 22 '18 at 19:00
  • @Tagwint I made it log the action and the log tell me /root/tunnel.sh: line 2: ip: command not found Does this just mean I'm not waiting it long enough or what? Since the commands work fine if I execute the script from the bash terminal or if I paste all the commands from it one by one – Tundral Mar 22 '18 at 19:11
  • @JeffSchaller I didn't have the she-bang on the top of the script but I added it now and did what Tagwint told me to do to log the output of the script. since it outputs what I posted in the above comment I presume it's not a problem with variables or activities done by the shell. – Tundral Mar 22 '18 at 19:15
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/root/tunnel.sh: line 2: ip: command not found

Your root login profile (one of ~/.bash_profile, ~/.bash_login, or ~/.profile) is setting $PATH to include /usr/sbin, while your (non-login) script is not setting $PATH to include /usr/sbin.

Either expand $PATH in your script or use full paths to programs that are in /usr/sbin.

PATH=$PATH:/usr/sbin

or

/usr/sbin/ip ...
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  • I have another @reboot cronjob for a script, but unfortunately that doesn't work either. The script looks like this: #!/bin/sh cd /home/mc/mc/ while true do java -Xms10G -Xmx10G -jar spigot.jar echo done sleep 3 done (sorry for it not being properly formatted the comments don't seem to support the code block formatting) And the log I set up for it just shows: Must be connected to a terminal. – Tundral Mar 22 '18 at 20:02
  • Sounds like it might be a new question! – Jeff Schaller♦ Mar 22 '18 at 20:12

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