Results 1 to 9 of 9

Thread: Backup Script trouble

  1. #1
    Join Date
    Apr 2009
    Location
    Costa Rica
    Beans
    255
    Distro
    Ubuntu 10.04 Lucid Lynx

    Backup Script trouble

    Hi all,

    I wrote a very small and simple script to stop a service, backup a folder, copy it to a remote location via scp and then start the service again.

    Everything works except for one thing, the service does not want to start for some reason, I have to manually ssh into the server and execute the comand to start it.

    Here is the script, like I said, nothing fancy:

    Code:
    #!/bin/bash
    FILE=openbravo$(date +"%d-%m-%y").tar.gz
    /etc/init.d/openbravo stop
    cd /opt
    tar cvzf $FILE OpenbravoERP-3.0
    scp $FILE 123.123.123.123:/REMOTE/LOCATION
    /etc/init.d/openbravo start
    If I input the last command on the command line it works no problem, its only when the scheduled job runs that I run into this issue.

    I have also tried putting the scp command at the end to see if it made any difference, but same problem.

    How can I debug this?

    thanks a lot for the help!

    ps: I checked the scp command above and its completing succesfully (I can see the file on the remote location).
    Last edited by X1R1; October 12th, 2012 at 08:01 PM.
    Linux User#498977
    There are only 10 types of people in the world. Those who understand binary, and those who dont.
    My Blog about Linux and other stuff

  2. #2
    Join Date
    Nov 2006
    Location
    Belgium
    Beans
    3,010
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Backup Script trouble

    does the entire script works when you run it manually ?
    if not, what does it say ?

    Dou you suppress output from cron ? It usually logs or sends mail if a cron job produces output, such as an error msg. You want to see those.

  3. #3
    Join Date
    Nov 2006
    Location
    Belgium
    Beans
    3,010
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Backup Script trouble

    wild guess:

    the '/etc/init.d/openbravo start' is not executed because your script hangs on the preceding command;

    therefore : assume the script fails on 'scp $FILE ... ... ' fails, possibly because cron runs as root and root can not logon to the target server.

  4. #4
    Join Date
    Sep 2011
    Location
    Behind you!
    Beans
    515
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Backup Script trouble

    What user are you scheduling this script to run as?

    Can the service only be shutdown using root privileges?

    EDIT #1: Also, when using scripts, be sure to include the FULL path to everything...never assume a current working directory.

    e.g. Full path for the archive file in your FILE variable.

    It would also be wise to checked the return code of any command you run so you can handle the exceptional case of when it doesn't work. Did the tar command work? Did the copy command work? Did the service actually stop...did it actually start? These are all things you really need to know when automating such tasks. I would include a bit of code to include sending email notifications whenever (not if) it fails.

    EDIT #2: I include a path in my crontab schedule to help avoid these problems...but I still specify full paths whenever I can. LOOK HERE

    LHammonds
    Last edited by LHammonds; October 15th, 2012 at 02:32 PM.

  5. #5
    Join Date
    Apr 2012
    Beans
    5,461

    Re: Backup Script trouble

    I agree it's likely a environment (PATH) thing - you may need to give a path to start/stop as well (which are also commands - in /sbin) not just the 'service' command (in /usr/sbin) - see this post

    http://ubuntuforums.org/showpost.php...94&postcount=4
    Last edited by steeldriver; October 12th, 2012 at 11:41 PM.

  6. #6
    Join Date
    Oct 2005
    Location
    Al Ain
    Beans
    7,930

    Re: Backup Script trouble

    Howdy,

    Check the paths in the /etc/init.d/openbravo script and expand them all. Cron runs with a very limited environment setup.

  7. #7
    Join Date
    Apr 2009
    Location
    Costa Rica
    Beans
    255
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Backup Script trouble

    Thanks for all the tips!

    Im going to try an answer every post, here I go:

    @koen 1. Yes it works when I run it manually (every part of the script does)
    2. No I haven't suppressed any output from cron. The only part where I found cron output was in syslog, but nothing relevant, only stuff like this:

    Code:
    Oct 15 12:17:01 openbravo CRON[18181]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
    Oct 15 12:25:01 openbravo CRON[18361]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    Oct 15 12:35:01 openbravo CRON[18544]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    Oct 15 12:45:01 openbravo CRON[18728]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    Oct 15 12:55:01 openbravo CRON[18947]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    Oct 15 13:05:01 openbravo CRON[19132]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    Oct 15 13:15:01 openbravo CRON[19316]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    Oct 15 13:17:01 openbravo CRON[19326]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
    No idea what any of that means.

    Also, regarding your wild guess, I also tought about that and switched the commands order, but same result, the file in fact gets copied succesfully.

    @LHammonds

    1. Script is scheduled to run as root and I always stop the service using sudo (if im not root at that time) so no problems there. I will also try and improve the script to check the return codes and make the script a little more professional.

    regarding your EDIT#1 part, I just implemented this, lets see if it makes any difference.

    I also added a PATH to the crontab file as suggested by you and @steeldriver (I included the PATH on your webpage)

    I have a question regarding this...am I opening a security hole while adding non-default paths to a root crontab?


    @HermanAB the openbravo script in fact shutdowns a couple processes:

    Code:
    start() {
            service openbravo-postgresql start
            service openbravo-tomcat start
            service apache2 status >/dev/null 2>&1 || service apache2 start
    }
    
    stop() {
            service openbravo-tomcat stop
            service openbravo-postgresql stop
    thanks all! hopefully this changes will make it work
    Linux User#498977
    There are only 10 types of people in the world. Those who understand binary, and those who dont.
    My Blog about Linux and other stuff

  8. #8
    Join Date
    Sep 2011
    Location
    Behind you!
    Beans
    515
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Backup Script trouble

    Quote Originally Posted by X1R1 View Post
    I also added a PATH to the crontab file as suggested by you and @steeldriver (I included the PATH on your webpage)

    I have a question regarding this...am I opening a security hole while adding non-default paths to a root crontab?
    I don't think anything there is non-standard. All I did was "echo $PATH" while logged in as root and copied the same path into the crontab...thus ensuring that whatever I type at the console will work in crontab. It is not absolutely necessary but if adding the path to crontab and the script starts to work, then it is obvious that the problem is in the script...no using full paths (e.g. relative paths).

    If the path variable allows it to work, I recommend modifying your script so that it will work without the presence of the path variable in crontab.

    Regarding security, it could be an issue if somebody places a man-in-the-middle program with the same name in your path (before it finds the real program) or it can be a version/name issue where your script is expecting a certain program but because it was not called with the full path, could get a completely different program that is found in the path with the same name.

    Use relative paths can help your script be a bit more portable but always try to use the full path whenever you can. The full path can include variables to help keep it portable such as ${TMP}/tempfile.txt or ${HOME}/myfile.txt

    But regardless of any proposed solutions, you need to find out exactly why the script is failing and fix that particular problem (and not leave a bunch of failed test solutions in place when finished).

    For examples on checking return codes and handing errors, you can look at the same link I gave earlier. I have several scripts there that have all kinds of helpful code to handle all kinds of scenarios. Just pick-n-choose what you need for your scenario. Many of my scripts are VERY simple at its core...maybe a handful of commands but the bulk of the scripts are there to handle errors and logging.

    LHammonds

  9. #9
    Join Date
    Apr 2009
    Beans
    Hidden!
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: Backup Script trouble

    Best way to discover what's going on is to put some output for commands on your startup script..

    About your profile environment.. If you have a .bashrc or .bash_profile for root you can load it on you backup script..

    Just put something like this:

    ./root/.PROFILE_SCRIPT
    Assuming that /root is your root's $HOME and that it's scheduled into root's cron

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •