Startup Script ...

maas187 · 08-13-2008, 05:01 PM

hi to all ,
i need to write a script that will run everytime my system reboot.
i have few commands that i need them to be executed when the server boot up

PS. iam good with Bash Scripts .

trickykid · 08-13-2008, 05:03 PM

If it's some type of daemon, this depends on what distribution you're using. Most reside in /etc/init.d or /etc/rc.d

If it's just a few commands that don't run as a service or the like, simply place the script or commands in your rc.local file to get invoked at bootup.

maas187 · 08-13-2008, 05:06 PM

Quote:

Originally Posted by trickykid

If it's some type of daemon, this depends on what distribution you're using. Most reside in /etc/init.d or /etc/rc.d

If it's just a few commands that don't run as a service or the like, simply place the script or commands in your rc.local file to get invoked at bootup.

iam Using Fedora 8 .

so it must be init , and about the deamon , well maybe keep it last so al services are running .

commands are ,

1 - ssh: to a remote server.
2 - mail: as an alert.
3 - iptables: for routing .

trickykid · 08-13-2008, 05:09 PM

Quote:

Originally Posted by maas187

1 - ssh: to a remote server.
2 - mail: as an alert.
3 - iptables: for routing .

These would be good candidates for rc.local, not their own customized init startup script to me. Why would you need to ssh into a remote server out of curiosity that is in a startup script?

maas187 · 08-13-2008, 05:12 PM

Quote:

Originally Posted by trickykid

These would be good candidates for rc.local, not their own customized init startup script to me. Why would you need to ssh into a remote server out of curiosity that is in a startup script?

well, too keep things short , iam using ssh to access the web. since my ISP blocks most sites.
with this command :
ssh -D 8998 username@remoteserver.com
which i have set up on my browser settings as well ,

where could i find this rc.local ?

maas187 · 08-13-2008, 05:19 PM

Quote:

Originally Posted by maas187

well, too keep things short , iam using ssh to access the web. since my ISP blocks most sites.
with this command :
ssh -D 8998 username@remoteserver.com
which i have set up on my browser settings as well ,

where could i find this rc.local ?

thank man for the info .. i found it ..

its /etc/rc.d/rc.local

,, do you thing that ssh will work ???

maas187 · 08-13-2008, 05:37 PM

Quote:

Originally Posted by maas187

thank man for the info .. i found it ..

its /etc/rc.d/rc.local

,, do you thing that ssh will work ???

well, guys i tried to put the SSH command in the rc.local , when the system boots up , it logs to the remote server and jams after i cant login to the system anymore . had to boot into level 3 to exit the SSH connection .. any ideas ?????

chort · 08-13-2008, 05:42 PM

Code:

ssh -nND 8998 -i /path/to/privatekey username@remoteserver.com &

Note that your privatekey cannot require a passphrase if you do this.

I haven't actually tested that this works with an init script. It's possible that you might need to add nohup in front of ssh.

maas187 · 08-13-2008, 05:46 PM

Quote:

Originally Posted by chort

Code:

ssh -nND 8998 -i /path/to/privatekey username@remoteserver.com &

Note that your privatekey cannot require a passphrase if you do this.

I haven't actually tested that this works with an init script. It's possible that you might need to add nohup in front of ssh.

sorry my dear friend . but what is a nohup ???

and when i added the ssh to the rc.local i could see it connected to the server , but the problem is that i cant be a local user anymore unless i exit ???
is there a way to keep it running in the background ???

maas187 · 08-13-2008, 06:04 PM

Quote:

Originally Posted by maas187

sorry my dear friend . but what is a nohup ???

and when i added the ssh to the rc.local i could see it connected to the server , but the problem is that i cant be a local user anymore unless i exit ???
is there a way to keep it running in the background ???

hi , i tried , nohup , and "-n" and "-s" ,,, still no use ??

any ideas ??
thankx in advance ? ?

grepmasterd · 08-13-2008, 06:17 PM

just a hunch, but...

write a script that will do this and fork itself into the background.

test it a couple times from the command line to make sure it works and backgrounds appropriately. then call the script from rc.local

grepmasterd · 08-13-2008, 06:20 PM

oh, and nohup means that the command will run immune to 'hangups'. it won't be attached to the shell script from which it was launched so the script should be able to exit. (often, shells wont exit completely if there are attached processes still running).

maas187 · 08-13-2008, 06:21 PM

Quote:

Originally Posted by grepmasterd

just a hunch, but...

write a script that will do this and fork itself into the background.

test it a couple times from the command line to make sure it works and backgrounds appropriately. then call the script from rc.local

could u please provide syntax ???

grepmasterd · 08-13-2008, 06:24 PM

another thought: use 'screen'

Quote:

screen -d -m ssh -nND 8998 -i /path/to/privatekey username@remoteserver.com

note: no backgrounding needed

screen rules.

maas187 · 08-13-2008, 06:26 PM

Quote:

Originally Posted by maas187

could u please provide syntax ???

ok . i get what u saying ..

Lol sorry this is like a chat room for me .

i tried
$ssh username@remoteserver.com -f "cd Folder" ...

but the thing is it runs and exits .. i checked the status with netstat -at ..

i need it to be running all the time ?