10 Replies Latest reply on Nov 18, 2014 11:52 AM by d4v1dk

    VCB and pre-freeze/post-thaw scripts in Linux VMs

    kipz Novice

       

      hello,

       

       

      i'm trying here to implement pre/post-snapshot scripts for backuping up some Linux-based VMs using VCB. i need to quiesce databases inside VM during snapshotting. according to VM backup guide i need to create following scripts inside VM:

       

       

      /usr/sbin/pre-freeze-script

      /usr/sbin/post-thaw-script

       

       

      during snapshotting VMware Tools should run these scripts automatically. i have tried it with different Linux flavors and these scripts are totally ignored. they are just not launched at all.

       

       

      am i missing something? VMware tools are installed inside VM. scripts have execute permissions set.

       

       

      regards,

       

       

      kipz

       

       

       

       

       

        • 1. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
          AndreTheGiant Guru
          User ModeratorsvExpert

          Which version of VCB and ESX are you using?

          Recent version use another location for those scripts.

           

          Andre

          • 2. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
            kipz Novice

             

            VCB is 1.5 U1 and ESX is 4.0.

             

             

             

             

             

            • 3. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
              kipz Novice

              at least according to latest VM backup guide, Linux script locations are stil lthe same.

              • 4. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
                AndreTheGiant Guru
                User ModeratorsvExpert

                Seems that your script are in a right position (page 52 of http://www.vmware.com/pdf/vsphere4/r40/vsp_vcb_15_u1_admin_guide.pdf)

                Have you make chmod a+x to your script.

                Can you run them from shell?

                 

                Are VMware Tools installed?

                 

                Andre

                • 5. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
                  kipz Novice

                   

                  yes, as i already mentionaed in my initial post vmware tools are installed and all execute permissions are set. and yes, these scripts run successfully from command line.

                   

                   

                  i have tested this with 2 different Linux VM-s with different Linux flavor (one 32-bit RedHat and 64-bit Debian) and even in totally different environments. and in both environments result is the same. those scripts are totally ignored.

                   

                   

                  i have seen from VCB backup logs (in verbose mode) that if script execution fails it returns error (in Windows). i even put "exit 1" command to the end of one script (for test) and no results in logs at all. so seems that it does not even try to launch it.

                   

                   

                  kipz

                   

                   

                   

                   

                   

                  • 6. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
                    AndreTheGiant Guru
                    vExpertUser Moderators

                    Sorry no other ideas.

                    Try to check again your vcbMounter command line or try with a Windows VM to see if scripts works in this kind of VM.

                     

                    Andre

                    • 7. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
                      jjahns Enthusiast

                       

                      Going to go ahead and update this on the resolution.

                       

                       

                      Copy your scripts to /etc/vmware-tools...  That should resolve the issue.

                       

                       

                      • 8. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
                        fgw Enthusiast

                        know this is an old post, but i'm currently running into this.

                         

                        have a solaris vm running on an esxi 3.5 using latest patches and vmwaretools version.

                         

                        scripts are located in /usr/sbin and security is set to 777 for testing:

                         

                        -rwxrwxrwx   1 root     root          36 May 30 12:24 /usr/sbin/post-thaw-script
                        -rwxrwxrwx   1 root     root          36 May 30 12:23 /usr/sbin/pre-freeze-script

                         

                        using veeam backup but this should not make a big difference. i can see the snapshot creation in virtual center and watch the backup running in veeam.

                         

                        the scripts contain the following code

                         

                        pre-freeze-script
                        echo PRE:  $1 $2 $3 >> /tmp/bck.log

                         

                        post-thaw-script
                        echo POST: $1 $2 $3 >> /tmp/bck.log

                         

                        expected to find /tmp/bck.log but nothing here. looks like my scrips are completely ignored ...

                         

                        tried to copy the scripts over into /etc/vmware-tools but no success here also?

                         

                        any clues?

                        • 9. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
                          fgw Enthusiast

                          to answer my own question:

                           

                          got response from vmware support. prefreeze and postfreeze scripts are NOT SUPPORTED on SOALRIS!

                           

                          prefreeze and postfreeze scripts are supported on windows and linux guests only!

                           

                          all other guest OS don't support the use of this scripts.

                           

                          this is true for esx 3.5 and also for esx 4.x!

                          • 10. Re: VCB and pre-freeze/post-thaw scripts in Linux VMs
                            d4v1dk Lurker

                            I just want to add my notes to this issue for those who are trying to get this to work.

                             

                            To create the pre-freeze-script and post-thaw-script on Linux, do the following:

                                1. Create /usr/sbin/pre-freeze-script

                            $ sudo echo "echo \"\$(date) pre-freeze\" >> /tmp/snapshot.log" > /usr/sbin/pre-freeze-script
                            

                                2. Create /usr/sbin/post-thaw-script

                            $ sudo echo "echo \"\$(date) post-thaw\" >> /tmp/snapshot.log" > /usr/sbin/post-thaw-script
                            

                                3. Change the owner

                            $ sudo chown root.root /usr/sbin/pre-freeze-script /usr/sbin/post-thaw-script
                            

                                4. Change the permissions

                            $ sudo chmod 0700 /usr/sbin/pre-freeze-script /usr/sbin/post-thaw-script
                            

                                5. Test by creating a snapshot in vcenter (make sure you CHECK "Quiesce guest file system" and UNCHECK "Snapshot the virtual machine's memory")

                                6. Look in the log file when the snapshot is complete (with memory option turned off, the snapshot should be very quick) you should see 2 new lines

                            $ cat /tmp/snapshot.log
                            

                             

                            I tested this on ESXi 5.1 in the following guest OS's:

                            RHEL 6.6 64-bit

                            Ubuntu 14.04 64-bit

                            Ubuntu 14.04 32-bit

                             

                            The one piece that was causing the scripts to NOT be triggered for me was the "Snapshot the virtual machine's memory" option when creating the snapshot in vcenter. As soon as I unchecked that and checked the quiesce option, it started working perfectly.

                             

                            HTH

                             

                            Dave