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how to run my script during boot in rhel 7

Posted on 2016-10-07
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Last Modified: 2016-10-21
I have RHEL 7.2 and not able to run my scirpt wile reboot actually when i am creating a soft link of my script then it wont work but if i am creating a file in init.d it works. please help with the correct process in rhel 7.2
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Question by:The Rock
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by:andreas
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Another thing to think of, maybe its a workable solution for your script.

create a cron job that runs once at boot time and execute the script there...
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by:The Rock
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Thanks but have a look at below link if you understand something because i tried but not a sucess with systemd. Might be you have any idea on this:

https://access.redhat.com/articles/754933

thanks
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by:omarfarid
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make sure that:

- you have SXXscriptname in the right run level dir. Name should start with S and XX is a sequence number. e.g. S88myscript
- all file systems are already mounted
- use full path names for files, folders, commands, etc
- set necessary env. variables
- if you need to run commands with specific username then use us - username command
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by:gheist
gheist earned 125 total points
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systemd needs pinching with chkconfig:
chkconfig --add name_of_init_script
chkconfig name_of_init_script on
service name_of_init_script start

upstart in RHEL6 rund anything you throw in /etc/init.d

Or add a script without init.d decorations in /etc/rc.local
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by:arnold
arnold earned 125 total points
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On what does this script depend and what you expect it todo?
Adding the script to /etc/init.d/ and using chkconfig setting to make sure it is executed after all the resources that it needs are loaded.

Look at anothe script
#chkconfig 234 80 20
Ir something like that when chkconfig as gheist referenced us used, it sets the script to run at runlevel 2, 3, 4 using 80 meaning everything before 80 has to be executed/started before this script runs. 20 tells/sets the order of terminating process on poweroff/restart/halt, etc.

You could also add the script command in the rc.local file which will run it once when the system loaded completely.

Your issue might be that you are scheduling its run too early resulting in a failure because a component it needs is still unavailable.
I.e. Trying to pull some data from network, but the network setup gas not yet ran. Access an NFS share, before the NFS components are brought up.

You can set  to run from /etc/inittab but be cautious of the settings, as you may trigger the run if the repetitively......
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by:The Rock
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Tried all it works on rhel 6 but dont know why it doesnt works while reboot on rhel 7.2 :(
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by:arnold
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What does the item you want to run at bootup supposed to do?
Where are you trying and what is happening.

Are saying you create an init.d script and link it out, but after the first reboot all those parameters are gone?
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by:The Rock
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No I have just create a simple script let say creating a file and directory using touch and mkdir full path of command under init.d . only diffrence is script is located under /opt and softlink is in under init.d

but it wont work.

if i place original file under init.d not a softlink then it works even after reboot
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by:omarfarid
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If they are both on same filesystem then create hardlink instead of softlink
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by:arnold
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The issue might be that /opt is unavailable when you try to run the script?
can you post df -k
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skullnobrains earned 250 total points
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init scripts are expected to provide standard options such as start/stop/reload... and there are tools to configure systemV. soft or hard linking a script in init is most definitely not the way to go.

but there is no reason to run a script through init.d which is meant to run daemons unless you really need your script to start early during the boot process.

in your case, you apparently run into the reverse problem. this is solvable in init.d by addding required dependencies with something like "After=local-fs.target" in a yourscript.target file. ( I feel like throwing whenever i see linuxian service dependencies config whatever the distribution as long as it has been based on SysV at any point in time )

stick a file in /etc/cron.d or in the regular crontab and schedule using "@reboot" instead of the usual 5 first fields : this will be simpler and easier to maintain. and this works fine and in the exact same way on any unix-like os
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by:The Rock
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Hello Skullnobrains,

Thanks your cron @reboot option looks good but i dont know about syntax never used it could you please help it how to do it if my script is /opt/abc.sh how to run it and what entry need to make it ?

thank you
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by:skullnobrains
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in the regular crontab, something like this should do

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
@reboot sh /opt/abc.sh > /var/log/output.log 2>&1

Open in new window


if you're using a file in cron.d you'd need to add the username in front of @reboot

i added a standard path as crontab use a default path which lacks many commands

have a look at "man 5 crontab"
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Author Closing Comment

by:The Rock
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Thanks all for your suggestions. Appreciated
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