Run script at boot time

[Loïc Grenié]

2010/11/14 Shahar Dag <dag at cs.technion.ac.il>:
> "Loïc Grenié" <loic.grenie at gmail.com>
>> 2010/11/14 Shahar Dag <dag at cs.technion.ac.il>:
>>> Hello
>>>
>>>
>>>
>>> On Ubuntu 8.04 I want to run a script that update some files.
>>>
>>> I want to run the script when the computer boots.
>>>
>>> The script takes the data from a mounted file system (it’s a network file
>>> system).
>>>
>>>
>>>
>>> The script is started by an entry in /etc/crontab that looks like:
>>>
>>> @reboot root my_script
>>>
>>> The problem is that the file system is not mounted when my_script is
>>> called.
>>
>>    /etc/rc.local is one of the last script to be called at boot. All
>> NFS filesystems
>>  should be mounted at that point. Are your NFS flesystems in /etc/fstab and
>>  mounted "normally" by the system or are there mounted by some custom
>>  way ?
>>
> Its a regular NFS filesystem mounted normally from /etc/fstab

    As suggested by Nils Kassube, you can wait for the data to be present
  to finish your script:

while ! -f /mnt/nfs/<whatever>
do
    sleep 60
done

  It won't make your boot longer:
  1) If you can finish your boot with your NFS partition not mounted (and your
  script waiting) launch your script in background in /etc/rc.local.
  2) It you cannot finish your with your NFS partition not mounted, then your
  script will wait and be launched afterward, but what else can you do ? You
  can lower the sleep to sleep 1 if you want faster action.

        Hope this helps,

              Loïc