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0

1

I need to do some maintenance on a bunch of Debian (Wheezy) systems, and it has to happen at run level 1. But not all machines have a keyboard and a screen; some are even located somewhere else. So I can't just go there and type in the root password to trigger the job.

So my question is how can I tell Debian to run a command right before the "Type root password or ^D" prompt?

I've tried to make a init script that only runs on run level 1, but still it was triggered before all processes where killed.

Is there a way to do this?

debian administration runlevel

share|improve this question

edited Jul 15 '14 at 15:13

Christopher

11.4k44 gold badges3333 silver badges5151 bronze badges

asked Jul 15 '14 at 14:53

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

bumped to the homepage by Community♦ 2 hours ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why does it need to be done on runlevel 1?
  
  – jordanm
  Jul 15 '14 at 15:11
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I need to remount the root filesystem as ro
  
  – Florian Fida
  Jul 15 '14 at 17:36
  

  
  
  
  

add a comment | 

0

1

I need to do some maintenance on a bunch of Debian (Wheezy) systems, and it has to happen at run level 1. But not all machines have a keyboard and a screen; some are even located somewhere else. So I can't just go there and type in the root password to trigger the job.

So my question is how can I tell Debian to run a command right before the "Type root password or ^D" prompt?

I've tried to make a init script that only runs on run level 1, but still it was triggered before all processes where killed.

Is there a way to do this?

debian administration runlevel

share|improve this question

edited Jul 15 '14 at 15:13

Christopher

11.4k44 gold badges3333 silver badges5151 bronze badges

asked Jul 15 '14 at 14:53

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

bumped to the homepage by Community♦ 2 hours ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why does it need to be done on runlevel 1?
  
  – jordanm
  Jul 15 '14 at 15:11
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I need to remount the root filesystem as ro
  
  – Florian Fida
  Jul 15 '14 at 17:36
  

  
  
  
  

add a comment | 

I need to do some maintenance on a bunch of Debian (Wheezy) systems, and it has to happen at run level 1. But not all machines have a keyboard and a screen; some are even located somewhere else. So I can't just go there and type in the root password to trigger the job.

So my question is how can I tell Debian to run a command right before the "Type root password or ^D" prompt?

I've tried to make a init script that only runs on run level 1, but still it was triggered before all processes where killed.

Is there a way to do this?

debian administration runlevel

share|improve this question

edited Jul 15 '14 at 15:13

Christopher

11.4k44 gold badges3333 silver badges5151 bronze badges

asked Jul 15 '14 at 14:53

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

share|improve this question

edited Jul 15 '14 at 15:13

Christopher

11.4k44 gold badges3333 silver badges5151 bronze badges

asked Jul 15 '14 at 14:53

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

share|improve this question

edited Jul 15 '14 at 15:13

Christopher

11.4k44 gold badges3333 silver badges5151 bronze badges

asked Jul 15 '14 at 14:53

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

edited Jul 15 '14 at 15:13

Christopher

11.4k44 gold badges3333 silver badges5151 bronze badges

edited Jul 15 '14 at 15:13

Christopher

11.4k44 gold badges3333 silver badges5151 bronze badges

asked Jul 15 '14 at 14:53

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

asked Jul 15 '14 at 14:53

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

1 Answer
1

active

oldest

votes

0

I found a way, but it feels dirty... :)

So i'll leave this open and see if someone has a clean way.

My solution is to modify inittab to run a script instead of sulogin and restore the old inittab from within the script.

here is a 'cut and paste to the terminal' proof of concept version which i just used to compact some VM harddrives.

But: Don't just try this unless you know what it does!

mkdir -p /opt/single

cp -a /etc/inittab /opt/single/inittab

sed -i "s//sbin/sulogin//opt/single/job.sh/" /etc/inittab

cat>/opt/single/job.sh<<EOF

#!/bin/bash

  #restore inittab

  mv -fv /opt/single/inittab /etc/inittab

  #make sure no one runs this by accident

  chmod -x /opt/single/job.sh

  #do your thing...

  mount -o remount,ro /dev/sda1

  fsck.ext4 -vfp /dev/sda1

  zerofree -v /dev/sda1

  mount -o remount,rw /dev/sda1

  #work done 

  reboot

EOF

chmod +x /opt/single/job.sh

telinit 1

share|improve this answer

answered Jul 16 '14 at 2:56

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

add a comment | 

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0

I found a way, but it feels dirty... :)

So i'll leave this open and see if someone has a clean way.

My solution is to modify inittab to run a script instead of sulogin and restore the old inittab from within the script.

here is a 'cut and paste to the terminal' proof of concept version which i just used to compact some VM harddrives.

But: Don't just try this unless you know what it does!

mkdir -p /opt/single

cp -a /etc/inittab /opt/single/inittab

sed -i "s//sbin/sulogin//opt/single/job.sh/" /etc/inittab

cat>/opt/single/job.sh<<EOF

#!/bin/bash

  #restore inittab

  mv -fv /opt/single/inittab /etc/inittab

  #make sure no one runs this by accident

  chmod -x /opt/single/job.sh

  #do your thing...

  mount -o remount,ro /dev/sda1

  fsck.ext4 -vfp /dev/sda1

  zerofree -v /dev/sda1

  mount -o remount,rw /dev/sda1

  #work done 

  reboot

EOF

chmod +x /opt/single/job.sh

telinit 1

share|improve this answer

answered Jul 16 '14 at 2:56

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

add a comment | 

0

I found a way, but it feels dirty... :)

So i'll leave this open and see if someone has a clean way.

My solution is to modify inittab to run a script instead of sulogin and restore the old inittab from within the script.

here is a 'cut and paste to the terminal' proof of concept version which i just used to compact some VM harddrives.

But: Don't just try this unless you know what it does!

mkdir -p /opt/single

cp -a /etc/inittab /opt/single/inittab

sed -i "s//sbin/sulogin//opt/single/job.sh/" /etc/inittab

cat>/opt/single/job.sh<<EOF

#!/bin/bash

  #restore inittab

  mv -fv /opt/single/inittab /etc/inittab

  #make sure no one runs this by accident

  chmod -x /opt/single/job.sh

  #do your thing...

  mount -o remount,ro /dev/sda1

  fsck.ext4 -vfp /dev/sda1

  zerofree -v /dev/sda1

  mount -o remount,rw /dev/sda1

  #work done 

  reboot

EOF

chmod +x /opt/single/job.sh

telinit 1

share|improve this answer

answered Jul 16 '14 at 2:56

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

add a comment | 

I found a way, but it feels dirty... :)

So i'll leave this open and see if someone has a clean way.

My solution is to modify inittab to run a script instead of sulogin and restore the old inittab from within the script.

here is a 'cut and paste to the terminal' proof of concept version which i just used to compact some VM harddrives.

But: Don't just try this unless you know what it does!

mkdir -p /opt/single

cp -a /etc/inittab /opt/single/inittab

sed -i "s//sbin/sulogin//opt/single/job.sh/" /etc/inittab

cat>/opt/single/job.sh<<EOF

#!/bin/bash

  #restore inittab

  mv -fv /opt/single/inittab /etc/inittab

  #make sure no one runs this by accident

  chmod -x /opt/single/job.sh

  #do your thing...

  mount -o remount,ro /dev/sda1

  fsck.ext4 -vfp /dev/sda1

  zerofree -v /dev/sda1

  mount -o remount,rw /dev/sda1

  #work done 

  reboot

EOF

chmod +x /opt/single/job.sh

telinit 1

share|improve this answer

answered Jul 16 '14 at 2:56

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

mkdir -p /opt/single

cp -a /etc/inittab /opt/single/inittab

sed -i "s//sbin/sulogin//opt/single/job.sh/" /etc/inittab

cat>/opt/single/job.sh<<EOF

#!/bin/bash

  #restore inittab

  mv -fv /opt/single/inittab /etc/inittab

  #make sure no one runs this by accident

  chmod -x /opt/single/job.sh

  #do your thing...

  mount -o remount,ro /dev/sda1

  fsck.ext4 -vfp /dev/sda1

  zerofree -v /dev/sda1

  mount -o remount,rw /dev/sda1

  #work done 

  reboot

EOF

chmod +x /opt/single/job.sh

telinit 1

share|improve this answer

answered Jul 16 '14 at 2:56

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

answered Jul 16 '14 at 2:56

Florian FidaFlorian Fida

98966 silver badges99 bronze badges

answered Jul 16 '14 at 2:56

Florian FidaFlorian Fida

98966 silver badges99 bronze badges