Linux – Run script before shutdown/restart

bashfedorainit.dlinux

I'd like to run a PHP script when an instance is told to shutdown, but of course before it actually finishes shutting down. My particular script is just looking to push some log files from the local partition to a another server.

I've got the gist of how this process works, but I need some clarification.

How I understand it. Please correct me if I'm wrong.

Create an executable script in /etc/init.d (lets call it /etc/init.d/push-logs)
Create a symlink to /etc/init.d/push-logs from /etc/rc0.d (shutdown) and /etc/rc6.d (reboot). The name should be KXXpush-logs

Here's my questions:

Of course – am I understanding correctly?
For #2 above – it sounds like the lower the XX the better – is there too low a number I can use? Does it matter if it shares a number with another script?
Does the script in /etc/init.d/push-logs HAVE to follow the standard init.d template (supporting start/stop, etc. commands)? This doesn't really apply to my use case. If possible I just want the script to be the following:

#!/bin/sh
#
# Run PHP file prior to shutdown
#

/usr/bin/php /path/to/php_file.php

Best Answer

Yes, ut the symlink name should begin with a S - for Start (K for Kill)
The two-digit specifies the order of execution for your script, the lowest numbered being execute first.
Yes, because Linux will execute the equivalent of service push-logs start for the S symlink.

Related Solutions

Linux – How to run a command multiple times, using bash shell

I don't think a command or shell builtin for this exists, as it's a trivial subset of what the Bourne shell for loop is designed for and implementing a command like this yourself is therefore quite simple.

Per JimB's suggestion, use the Bash builtin for generating sequences:

for i in {1..10}; do command; done

For very old versions of bash, you can use the seq command:

for i in `seq 10`; do command; done

This iterates ten times executing command each time - it can be a pipe or a series of commands separated by ; or &&. You can use the $i variable to know which iteration you're in.

If you consider this one-liner a script and so for some unspecified (but perhaps valid) reason undesireable you can implement it as a command, perhaps something like this on your .bashrc (untested):

#function run
run() {
    number=$1
    shift
    for i in `seq $number`; do
      $@
    done
}

Usage:

run 10 command

Example:

run 5 echo 'Hello World!'

Linux – Chiliproject / redmine: cannot start thin on init

Your environmet variables seems to indicate your server is using the Ruby Version Manager:

Ruby Version Manager, often abbreviated as RVM, is a unix-like software platform designed to manage multiple installations of Ruby on the same device.

The entire ruby environment including the Ruby interpreter, installed RubyGems, and documentation is partitioned. The different versions can then be switched between to enable a developer to work on several projects with different version requirements.

Apparently RVM isn't included in your boot environment. You may easily solve it reinstalling the service again:

First, update your RVM to the latest version

rvm get stable

Then, perform these steps

create init.d entry for thin
```
 sudo thin install 
```

set up some defaults

 sudo /usr/sbin/update-rc.d -f thin defaults

generate boot config for your rails app

 sudo thin config -C /etc/thin/<appname>.yml -c /var/rails/<appdir> --servers 4 -e production

generate rvm wrapper script

 rvm wrapper <rubyversion>@<gemset> bootup thin

If you're using a global gemset, you can just use
```
 rvm wrapper ruby-1.9.2-p125 bootup thin
```
edit thin init
```
 sudo nano /etc/init.d/thin
```

change the original loader

 DAEMON=/usr/local/rvm/gems/ruby-<rubyversion>-<rubyrevision>@<gemset>/bin/thin

to point to the rvm wrapper instead
```
 DAEMON=/usr/local/bin/bootup_thin
```
start it up
```
 sudo /etc/init.d/thin start
```

Now it should start when your system boots up.

Source: https://stackoverflow.com/a/3376785/792066

Best Answer

Related Solutions

Linux – How to run a command multiple times, using bash shell

Linux – Chiliproject / redmine: cannot start thin on init

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