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ifdown in cron bash script fails to run

node.js app runs from command line but gives errors when run from cron job on reboot on ubuntu 14.04 LTSCannot run bash script from crontab when it works from command line bash@reboot works with command but not script - Cronscript does not write to file when executed from croncrontab scheduled script errorHow do I get cron to run my bash script which references node?mysqldump script doesn't work in cronScript not logging to file when run from cron, but works fine otherwise

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty
margin-bottom:0;

2

1

I have a script that is run when a server (Ubuntu 14.04) boots up using @reboot in crontab (Under the root user)

@reboot /bin/bash /root/init.sh >> /var/logs/vminit.log

The script runs a number of things, but when it reaches this line

ifdown eth1

The script exits, and ifdown does not run. (Running ifconfig still shows eth1 in the output) Enabling Verbose mode on ifdown returns nothing too.

If I manually run the script myself, it runs as expected.

I wrote a test script just to rule out any issues with init.sh

#!/bin/bash
echo 'one'
ifdown eth1
echo 'two'

If I run it manually, I get this output (which is expected)

one
<DHCP Client info>
two

If I place this test script into the crontab to be run with @reboot, I get the same results as init.sh, and the output is

one

I've tested by running the cron at an exact time (Example: 25 14 * * *) to see if it's something with `@reboot', but no luck.

I've also tried delaying the script from running after boot incase something was blocking ifdown from running

@reboot /bin/sleep 60; /bin/bash /root/init.sh >> /var/log/vminit.log

A few notes:
- Eth1 is an active interface, prior to running ifdown the script makes a call out of eth1 to grab a file successfully.
- The script is run as root
- Permissions with the script (and log) are fine.
- Running init.sh or the test script manually runs as expected.

networking cron reboot interface

share|improve this question

edited Apr 30 '15 at 14:09

adamstrawson

asked Apr 30 '15 at 13:56

adamstrawsonadamstrawson

2344 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  1. Does the script (and ifdown) hang or end prematurely? (Do you see it in ps -ef?) It should hang if your script does not continue. ------ 2. Try to use the verbose switch to get more information: ifdown -v eth1 ------ 3. Does it fail if you manually restart cron? Try sudo service cron stop && sudo service cron start ------ 4. What are the exported environment variables in the working and non-working case? Store the output of export. If the non-working case is missing some variables which could be important, try to set them in your script.
  
  – pabouk
  Apr 30 '15 at 16:23
  

  
  
  
  

add a comment
 | 

2

1

I have a script that is run when a server (Ubuntu 14.04) boots up using @reboot in crontab (Under the root user)

@reboot /bin/bash /root/init.sh >> /var/logs/vminit.log

The script runs a number of things, but when it reaches this line

ifdown eth1

The script exits, and ifdown does not run. (Running ifconfig still shows eth1 in the output) Enabling Verbose mode on ifdown returns nothing too.

If I manually run the script myself, it runs as expected.

I wrote a test script just to rule out any issues with init.sh

#!/bin/bash
echo 'one'
ifdown eth1
echo 'two'

If I run it manually, I get this output (which is expected)

one
<DHCP Client info>
two

If I place this test script into the crontab to be run with @reboot, I get the same results as init.sh, and the output is

one

I've tested by running the cron at an exact time (Example: 25 14 * * *) to see if it's something with `@reboot', but no luck.

I've also tried delaying the script from running after boot incase something was blocking ifdown from running

@reboot /bin/sleep 60; /bin/bash /root/init.sh >> /var/log/vminit.log

A few notes:
- Eth1 is an active interface, prior to running ifdown the script makes a call out of eth1 to grab a file successfully.
- The script is run as root
- Permissions with the script (and log) are fine.
- Running init.sh or the test script manually runs as expected.

networking cron reboot interface

share|improve this question

edited Apr 30 '15 at 14:09

adamstrawson

asked Apr 30 '15 at 13:56

adamstrawsonadamstrawson

2344 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  1. Does the script (and ifdown) hang or end prematurely? (Do you see it in ps -ef?) It should hang if your script does not continue. ------ 2. Try to use the verbose switch to get more information: ifdown -v eth1 ------ 3. Does it fail if you manually restart cron? Try sudo service cron stop && sudo service cron start ------ 4. What are the exported environment variables in the working and non-working case? Store the output of export. If the non-working case is missing some variables which could be important, try to set them in your script.
  
  – pabouk
  Apr 30 '15 at 16:23
  

  
  
  
  

add a comment
 | 

I have a script that is run when a server (Ubuntu 14.04) boots up using @reboot in crontab (Under the root user)

@reboot /bin/bash /root/init.sh >> /var/logs/vminit.log

The script runs a number of things, but when it reaches this line

ifdown eth1

The script exits, and ifdown does not run. (Running ifconfig still shows eth1 in the output) Enabling Verbose mode on ifdown returns nothing too.

If I manually run the script myself, it runs as expected.

I wrote a test script just to rule out any issues with init.sh

#!/bin/bash
echo 'one'
ifdown eth1
echo 'two'

If I run it manually, I get this output (which is expected)

one
<DHCP Client info>
two

If I place this test script into the crontab to be run with @reboot, I get the same results as init.sh, and the output is

one

I've tested by running the cron at an exact time (Example: 25 14 * * *) to see if it's something with `@reboot', but no luck.

I've also tried delaying the script from running after boot incase something was blocking ifdown from running

@reboot /bin/sleep 60; /bin/bash /root/init.sh >> /var/log/vminit.log

A few notes:
- Eth1 is an active interface, prior to running ifdown the script makes a call out of eth1 to grab a file successfully.
- The script is run as root
- Permissions with the script (and log) are fine.
- Running init.sh or the test script manually runs as expected.

networking cron reboot interface

share|improve this question

edited Apr 30 '15 at 14:09

adamstrawson

asked Apr 30 '15 at 13:56

adamstrawsonadamstrawson

2344 bronze badges

@reboot /bin/bash /root/init.sh >> /var/logs/vminit.log

ifdown eth1

#!/bin/bash
echo 'one'
ifdown eth1
echo 'two'

one
<DHCP Client info>
two

one

@reboot /bin/sleep 60; /bin/bash /root/init.sh >> /var/log/vminit.log

share|improve this question

edited Apr 30 '15 at 14:09

adamstrawson

asked Apr 30 '15 at 13:56

adamstrawsonadamstrawson

2344 bronze badges

share|improve this question

edited Apr 30 '15 at 14:09

adamstrawson

asked Apr 30 '15 at 13:56

adamstrawsonadamstrawson

2344 bronze badges

asked Apr 30 '15 at 13:56

adamstrawsonadamstrawson

2344 bronze badges

asked Apr 30 '15 at 13:56

adamstrawsonadamstrawson

2344 bronze badges

2 Answers
2

active

oldest

votes

4

Really I don't know why ifdown doesn't work with crontab.

Anyway, I faced the same situation a long time ago and have a workaround solution, hope this will help you.

Replace

ifdown eth1

with

/sbin/ifconfig eth1 down 1> /dev/null

This worked for me.

share|improve this answer

answered Apr 30 '15 at 16:07

MaythuxMaythux

62.7k3636 gold badges190190 silver badges236236 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I logged in to post that I found the cause and you've answered it for me! Turns out that the default PATH variable is different for crons and a logged in user (for an out the box install). Setting the full path /sbin/ifconfig then worked. Strange that it didn't return any errors in the output/log though.
  
  – adamstrawson
  Apr 30 '15 at 21:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @adam0345 That's good
  
  – Maythux
  May 1 '15 at 5:27
  

  
  
  
  

add a comment
 | 

0

Even if you use wpa_cli as a cron job you need to provide the full path like so:

/sbin/wpa_cli -i eth1 reconfigure

share|improve this answer

answered Oct 1 at 22:14

OS2OS2

3144 bronze badges

add a comment
 | 

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4

Really I don't know why ifdown doesn't work with crontab.

Anyway, I faced the same situation a long time ago and have a workaround solution, hope this will help you.

Replace

ifdown eth1

with

/sbin/ifconfig eth1 down 1> /dev/null

This worked for me.

share|improve this answer

answered Apr 30 '15 at 16:07

MaythuxMaythux

62.7k3636 gold badges190190 silver badges236236 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I logged in to post that I found the cause and you've answered it for me! Turns out that the default PATH variable is different for crons and a logged in user (for an out the box install). Setting the full path /sbin/ifconfig then worked. Strange that it didn't return any errors in the output/log though.
  
  – adamstrawson
  Apr 30 '15 at 21:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @adam0345 That's good
  
  – Maythux
  May 1 '15 at 5:27
  

  
  
  
  

add a comment
 | 

4

Really I don't know why ifdown doesn't work with crontab.

Anyway, I faced the same situation a long time ago and have a workaround solution, hope this will help you.

Replace

ifdown eth1

with

/sbin/ifconfig eth1 down 1> /dev/null

This worked for me.

share|improve this answer

answered Apr 30 '15 at 16:07

MaythuxMaythux

62.7k3636 gold badges190190 silver badges236236 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I logged in to post that I found the cause and you've answered it for me! Turns out that the default PATH variable is different for crons and a logged in user (for an out the box install). Setting the full path /sbin/ifconfig then worked. Strange that it didn't return any errors in the output/log though.
  
  – adamstrawson
  Apr 30 '15 at 21:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @adam0345 That's good
  
  – Maythux
  May 1 '15 at 5:27
  

  
  
  
  

add a comment
 | 

Really I don't know why ifdown doesn't work with crontab.

Anyway, I faced the same situation a long time ago and have a workaround solution, hope this will help you.

Replace

ifdown eth1

with

/sbin/ifconfig eth1 down 1> /dev/null

This worked for me.

share|improve this answer

answered Apr 30 '15 at 16:07

MaythuxMaythux

62.7k3636 gold badges190190 silver badges236236 bronze badges

ifdown eth1

/sbin/ifconfig eth1 down 1> /dev/null

share|improve this answer

answered Apr 30 '15 at 16:07

MaythuxMaythux

62.7k3636 gold badges190190 silver badges236236 bronze badges

answered Apr 30 '15 at 16:07

MaythuxMaythux

62.7k3636 gold badges190190 silver badges236236 bronze badges

answered Apr 30 '15 at 16:07

MaythuxMaythux

62.7k3636 gold badges190190 silver badges236236 bronze badges

0

Even if you use wpa_cli as a cron job you need to provide the full path like so:

/sbin/wpa_cli -i eth1 reconfigure

share|improve this answer

answered Oct 1 at 22:14

OS2OS2

3144 bronze badges

add a comment
 | 

0

Even if you use wpa_cli as a cron job you need to provide the full path like so:

/sbin/wpa_cli -i eth1 reconfigure

share|improve this answer

answered Oct 1 at 22:14

OS2OS2

3144 bronze badges

add a comment
 | 

Even if you use wpa_cli as a cron job you need to provide the full path like so:

/sbin/wpa_cli -i eth1 reconfigure

share|improve this answer

answered Oct 1 at 22:14

OS2OS2

3144 bronze badges

/sbin/wpa_cli -i eth1 reconfigure

share|improve this answer

answered Oct 1 at 22:14

OS2OS2

3144 bronze badges

answered Oct 1 at 22:14

OS2OS2

3144 bronze badges

answered Oct 1 at 22:14

OS2OS2

3144 bronze badges