FAQ

Bacula 1.34 User's Guide |
LGPL | Index | Security Issues
  # Bacula Frequently Asked Questions See the bugs section of this document for a list of known bugs and solutions. What is Bacula? Bacula is a network backup and restore program. Does Bacula support Windows? Yes, Bacula compiles and runs on Windows machines (Win98, WinMe, WinXP, WinNT, and Win2000). We provide a binary version of the Client (bacula-fd), but have not tested the Director nor the Storage daemon. Note, Win95 is no longer supported because it doesn't have the GetFileAttributesExA API call. What language is Bacula written in? It is written in C++, but it is mostly C code using only a limited set of the C++ extensions over C. Thus Bacula is completely compiled using the C++ compiler. There are several modules, including the Win32 interface that are written using the object oriented C++ features. Over time, we are slowly adding a larger subset of C++. On what machines does Bacula run? Bacula builds and executes on RedHat Linux (versions 7.1, 7.2, and 7.3), FreeBSD, Solaris, and Win32. On Win32 systems (Win95/98/Me/XP/NT/2000), only the client program (File daemon) has been tested. Bacula has been my only backup tool for over three years backing up 5 machines nightly (3 Linux boxes running RedHat, a Win98 machine, and a WinNT machine). Is Bacula stable? Yes, it is remarkably stable, but remember, there are still a lot of unimplemented or partially implemented features. With a program of this size (70,000+ lines of C code not including the SQL programs) there are bound to be bugs. The current test environment (a twisted pair local network and a HP DLT backup tape) is rather idea, so additional testing on other sites is necessary. The File daemon has never crashed -- running months at a time with no intervention. The Storage daemon is remarkably stable with most of the problems arising during labeling or switching tapes. Storage daemon crashes are rare. The Director, given the multitude of functions it fulfills is also relatively stable. In a production environment, it rarely if ever crashes. Of the three daemons, the Director is the most prone to having problems. It frequently runs several months with no problems. There are a number of reasons for this stability. 1. The program was largely written by one person to date (Kern). 2. The program constantly is checking the chain of allocated memory buffers to ensure that no overruns have occurred. 3. All memory leaks (orphaned buffers) are reported each time the program terminates. 4. Any signal (segmentation fault, ...) generates a traceback that is emailed to the developer. This permits quick resolution of bugs even if they only show up rarely in a production system. I'm Getting Authorization Errors. What is Going On? For security reasons, Bacula requires that both the File daemon and the Storage daemon know the name of the Director as well as his password. As a consequence, if you change the Director's name or password, you must make the corresponding change in the Storage daemon and in the File daemon configuration files. During the authorization process, the Storage daemon and File daemon also require that the Director authenticate himself, so both ends require the other to have the correct name and password. If you have edited the conf files and modified any name or any password, then your best bet is to go back to the original conf files generated by the Bacula installation process. Make only the absolutely necessary modifications to these files -- e.g. add the correct email address. Then follow the instructions in the Running Bacula chapter of this manual. You will run a backup to disk and a restore. Only when that works, should you begin customization of the conf files. Bacula Runs Fine but Cannot Access a Client on a Different Machine. Why? There are several reasons why Bacula could not contact a client on a different machine. They are: It is a Windows Client, and the client died because of an improper configuration file. Check that the Bacula icon is in the system tray and the the menu items work. If the client has died, the icon will disappear only when you move the mouse over the icon. The Client address or port is incorrect or not resolved by DNS. See if you can ping the client machine using the same address as in the Client record. You have a firewall, and it is blocking traffic on port 9102 between the Director's machine and the Clients machine (or on port 9103 between the Client and the Storage daemon machines). Your password or names are not correct in both the Director and the Client machine. Try configuring everything identical to how you run the client on the same machine as the Director, but just change the Address. If that works, make the other changes one step at a time until it works. My Catalog is Full of Test Runs, How Can I Start Over? If you are using MySQL do the following:
         cd <bacula-source>/src/cats
         ./drop_mysql_tables
         ./make_mysql_tables
  If you are using SQLite, do the following:
         Delete bacula.db from your working directory.
         cd <bacula-source>/src/cats
         ./drop_sqlite_tables
         ./make_sqlite_tables
  Then write an EOF on each tape you used with Bacula I Run a Restore Job and Bacula Hangs. What do I do? On Bacula version 1.25 and prior, it expects you to have the correct tape mounted prior to a restore. On Bacula version 1.26 and higher, it will ask you for the tape, and if the wrong one it mounted, it will inform you. If you have previously done an unmount command, all Storage daemon sessions (jobs) will be completely blocked from using the drive unmounted, so be sure to do a mount after your unmount. If in doubt, do a second mount, it won't cause any harm. I Cannot Get My Windows Client to Start Automatically? You are probably having one of two problems: either the Client is dying due to an incorrect configuration file, or you didn't do the Installation commands necessary to install it as a Windows Service. For the first problem, see the next FAQ question. For the second problem, please review the Windows Installation instructions in this manual. My Windows Client Immediately Dies When I Start It The most common problem is either that the configuration file is not where it expects it to be, or that there is an error in the configuration file. You must have the configuration file in c:\bacula\bin\bacula-fd.conf. To see what is going on when the File daemon starts on Windows, do the following:
          Start a DOS shell Window.
          cd c:\bacula\bin
          bacula-fd -t >out
          type out
  Calling bacula-fd with redirection (>) will write the diagnostic output to the file out which you can then list. The -t option tells Bacula to read the configuration file and then exit. When I Start the Console, the Error Messages Fly By. How can I see them? Either use a shell window with a scroll bar, or use the gnome-console. In any case, you probably should be logging all output to a file, and then you can simply view the file using an editor or the less program. To log all output, I have the following in my Director's Message resource definition:
          append = "/home/kern/bacula/bin/log" = all, !skipped
  Obviously you will want to change the filename to be appropriate for your system. I didn't realize that the backups were not working on my Windows Client. What should I do? You should be sending yourself an email message for each job. This will avoid the possibility of not knowing about a failed backup. To do so put something like:
        Mail = yourname@yourdomain = all, !skipped
  in your Director's message resource. You should then receive one email for each Job that ran. When you are comfortable with what is going on (it took me 9 months), you might change that to:
         MailOnError = yourname@yourdomain = all, !skipped
  1. then you only get email messages when a Job errors as is the case for your Windows machine. You should also be logging the Director's messages, please see the previous FAQ for how to do so. All my Jobs are scheduled for the same time. Will this cause problems? No, not at all. Bacula will schedule all the Jobs at the same time, but will run them one after another unless you have increased the number of simultaneous jobs in the configuration files for the Director, the File daemon, and the Storage daemon. The appropriate configuration record is Maximum Concurrent Jobs = nn. At the current time, we recommend that you leave this set to 1 for the Director. Can Bacula Backup My System To Files instead of Tape? Yes, in principle, Bacula can backup to any storage medium as long as you have correctly defined that medium in the Storage daemon's Device resource. For an example of how to backup to files, please see the Pruning Example in the Recycling chapter of this manual. Also, there is a whole chapter devoted to Backing Up to Disk. Can Bacula Backup and Restore Files Greater than 2 Giga Bytes in Size? If your operating system permits it, and you are running Bacula version 1.26 or later, the answer is yes. Unfortunately, large files are not supported by cygwin which Bacula uses for the Windows client. However, the native Windows APIs are used in Bacula version 1.31 and later on Windows systems, so in principal any 2 Giga Byte problems should disappear. I Started A Job then Decided I Really Did Not Want to Run It. Is there a better way than ./bacula stop to stop it? Yes, you normally should use the Console command cancel to cancel a Job that is either scheduled or running. If the Job is scheduled, it will be marked for cancellation and will be canceled when it is scheduled to start. If it is running, it will normally terminate after a few minutes. If the Job is waiting on a tape mount, you may need to do a mount command before it will be canceled. Why have You Trademarked the Name Bacula®? We have trademarked the name Bacula to ensure that all media written by any program named Bacula will always be compatible. Anyone may use the name Bacula, even in a derivative product as long as it remains totally compatible in all respects with the program defined here. Why is Your Online Document for Version 1.27 of Bacula when the Currently Release Version is 1.26? As Bacula is being developed, the document is also being enhanced, more often than not it has clarifications of existing features that can be very useful to our users, so we publish the very latest document. Fortunately it is rare that there are confusions with new features. If you want to read a document that pertains only to a specific version, please use the one distributed in the source code. How Can You Be Sure that Bacula Really Saves and Restores All Files? It is really quite simple, but took me awhile to figure out how to "prove" it. First make a Bacula Rescue disk, see the Disaster Recovery Using Bacula of this manual. Second, you run a full backup of all your files on all partitions. Third, you run an Verify InitCatalog Job on the same FileSet, which effectively makes a record of all the files on your system. Fourth, you run a Verify Catalog job and assure yourself that nothing has changed (well, between an InitCatalog and Catalog one doesn't expect anything). Then do the unthinkable, write zeros on your MBR (master boot record) wiping out your hard disk. Now, restore your whole system using your Bacula Rescue disk and the Full backup you made, and finally re-run the Verify Catalog job. You will see that with the exception of the directory modification and access dates and the files changed during the boot, your system is identical to what it was before you wiped your hard disk. I did a Full backup last week, but now in running an Incremental, Bacula says it did not find a FULL backup time, so it did a FULL backup. Why? Before doing an Incremental or a Differential backup, Bacula checks to see if there was a prior Full backup of the same Job that terminated successfully. If so, it uses the date that full backup started as the time for comparing if files have changed. If Bacula does not find a successfully full backup, it proceeds to do one. Perhaps you canceled the full backup, or it terminated in error. In such cases, the full backup will not be successful. You can check by entering list jobs and look to see if there is a prior Job with the same Name that has Level F and JobStatus T (normal termination). Another reason why Bacula may not find a suitable Full backup is that every time you change the FileSet, Bacula will require a new Full backup. This is necessary to ensure that all files are properly backed up in the case where you have added more files to the FileSet. Beginning with version 1.31, the FileSets are also dated when they are created, and this date is displayed with the name when you are listing or selecting a FileSet. For more on backup levels see below. How Can You Claim to Handle Unlimited Path and Filename Lengths when All Other Programs Have Fixed Limits? Most of those other programs have been around for a long time, in fact since the beginning of Unix, which means that they were designed for rather small fixed length path and filename lengths. Over the years, these restrictions have been relaxed allowing longer names. Bacula on the other hand was designed in 2000, and so from the start, Path and Filenames have been keep in buffers that start at 256 bytes in length but can grow as needed to handle any length. Most of the work is carried out by lower level routines making the coding rather easy. What Is the Really Unique Feature of Bacula? Well, it is hard to come up with unique features when backup programs for Unix machines have been around since the 1960s. That said, I believe that Bacula is the first and only program to use a standard SQL interface to its catalog database. Although this adds a bit of complexity and possibly overhead, it provides an amazingly rich set of features that are easy to program and enhance. The current code has barely scratched the surface in this regard (version 1.31). The second feature, which gives a lot of power and flexibility to Bacula is the Bootstrap record definition. The third unique feature, which is currently (1.30) unimplemented, and thus can be called vaporware :-), is Base level saves. When implemented, this will enormously reduce tape usage. Since Bacula is Multithreaded, Why Do You Recommend Not Running Multiple Simultaneous Jobs? Bacula can run multiple simultaneous jobs, but being very conservative, I do not recommend doing so at the current time for two reasons: 1. I'm not sure that two jobs accessing the same Volume won't have catalog conflicts. 2. Doing a restore from a Volume with records from two jobs intermingled is complicated. I expect to have definitive solutions to both of those problems in a later version. In the mean time, I recommend running one Job at a time. If you want to experiment with this as several large shops are doing, ensure that each job is writing to a different Volume (i.e. has a different Storage resource). This will avoid the two problems mentioned above. Just the same, there may be other race conditions in the Director that cause problems. Be forewarned. If I Do Run Multiple Simultaneous Jobs, How Can I Force One Particular Job to Run After Another Job? Yes, you can set Priorities on your jobs so that they run in the order you specify. Please see: the Priority record in the Job resource. I Am Not Getting Email Notification, What Can I Do? The most common problem is that you have not specified a fully qualified email address and your bsmtp server is rejecting the mail. The next most common problem is that your bsmtp server doesn't like the syntax on the From part of the message. For more details on this and other problems, please see the Getting Email Notification to Work section of the Tips chapter of this manual. The section Getting Notified of Job Completion of the Tips chapter may also be useful. For more information on the bsmtp mail program, please see bsmtp in the Volume Utility Tools chapter of this manual. I Change Recycling, Retention Periods, or File Sizes in my Pool Resource and they Still Don"t Work. The different variables associated with a Pool are defined in the Pool Resource, but are actually read by Bacula from the Catalog database. On Bacula versions prior to 1.30, after changing your Pool Resource, you must manually update the corresponding values in the Catalog by using the update pool command in the Console program. In Bacula version 1.30, Bacula does this for you automatically every time it starts. When Bacula creates a Media record (Volume), it uses many default values from the Pool record. If you subsequently change the Pool record, the new values will be used as a default for the next Volume that is created, but if you want the new values to apply to existing Volumes, you must manually update the Volume Catalog entry using the update volume command in the Console program. I Have Configured Compression On, But None of My Files Are Compressed. Why? There are two kinds of compression. One is tape compression. This is done by the tape drive hardware, and you either enable or disable it with system tools such as mt. This compression works independently of Bacula. Bacula also has compression code, which is normally used only when backing up to file Volumes. There are two conditions for this "software" to be enabled. You must have the zip development libraries loaded on your system when building Bacula and Bacula must find this library, normally /usr/lib/libz.a. On RedHat systems, this library is provided by the zlib-devel rpm. If the library is found by Bacula during the ./configure it will be indicated on the config.out line by:
                      ZLIB support:  yes
  - You must add the compression=gzip option on your Include statement in the Director's configuration file. Bacula is Asking for a New Tape After 2 GB of Data but My Tape holds 33 GB. Why? There are several reasons why Bacula will request a new tape. There is an I/O error on the tape. Bacula prints an error message and requests a new tape. Bacula does not attempt to continue writing after an I/O error. Bacula encounters and end of medium on the tape. This is not always distinguishable from an I/O error. You have specifically set some size limitation on the tape. For example the Maximum Volume Bytes or Maximum Volume Files in the Director's Pool resource, or Maximum Volume Size in the Storage daemon's Device resource. Bacula is Not Doing the Right Thing When I Request an Incremental Backup. Why? As explained in one of the previous questions, Bacula will automatically upgrade an Incremental or Differential job to a Full backup if it cannot find a prior Full backup or a suitable Full backup. For the gory details on how/when Bacula decides to upgrade levels please see the Level record in the Director's configuration chapter of this manual. If after reading the above mentioned section, you believe that Bacula is not correctly handling the level (Differential/Incremental), please send us the following information for analysis: Your Director's configuration file. The output from list jobs covering the period where you are having the problem. The Job report output from the prior Full save (not critical). An llist jobid=nnn where nnn is the JobId of the prior Full save. The Job report output from the save that is doing the wrong thing (not critical). An llist jobid=nnn where nnn is the JobId of the job that was not correct. An explanation of what job went wrong and why you think it did. The above information can allow us to analyze what happened, without it, there is not much we can do. I am Backing Up an Offsite Machine with an Unreliable Connection. The Director Waits Forever for the Client to Contact the SD. What Can I Do. Bacula was written on the assumption that it will have a good TCP/IP connection between all the daemons. As a consequence, the current Bacula doesn't deal with faulty connection very well. This situation is slowly being corrected over time. There are several things you can do to improve the situation. Upgrade to version 1.32 and use the new SDConnectTimeout record. For example, set:
                  SD Connect Timeout = 5 min
  in the FileDaemon resource. Run these kinds of jobs after all other jobs. When I ssh into a machine and start Bacula then attempt to exit, ssh hangs forever. This happens because Bacula leaves stdin, stdout, and stderr open for debug purposes. To avoid it, the simplest thing to do is to redirect the output of those files to /dev/null or another file in your startup script (the RedHat autostart scripts do this automatically). For example, you start the Director with:
          bacula-dir -c bacula-dir.conf ... 0>&1 2>&1 >/dev/null
  and likewise for the other daemons. I'm confused by the different Retention periods: File Retention, Job Retention, Volume Retention. Why are there so many? Yes, this certainly can be confusing. The basic reason for so many is to allow flexibility. The File records take quite a lot of space in the catalog, so they are typically records you want to remove rather quickly. The Job records, take very little space, and they can be useful even without the File records to see what Jobs actually ran and when. One must understand that if the File records are removed from the catalog, you cannot use the restore command to restore an individual file since Bacula no longer knows where it is. However, as long as the Volume Retention period has not expired, the data will still be on the tape, and can be recovered from the tape. For example, I keep a 30 day retention period for my Files to keep my catalog from getting too big, but I keep my tapes for a minimum of one year, just in case. Why Does Bacula Ignore the MaxVolumeSize Set in my Pool? The MaxVolumeSize that Bacula uses comes from the Media record, so most likely you changed your Pool, which is used as the default for creating Media records, after you created your Volume. Check what is in the Media record by doing:
      llist Volume=xxx
  If it doesn't have the right value, you can use:
      update Volume=xxx
to change it. In connecting to my Client, I get "ERR:Connection Refused. Packet Size too big from File daemon:192.168.1.4:9102" Why? This is typically a communications error resulting from one of the following: Old versions of Bacula, usually a Win32 client, where two threads were using the same I/O packet. Fixed in more recent versions. Please upgrade. Some other program such as an HP Printer using the same port (9102 in this case). If it is neither of the above, please submit a bug report at bugs.bacula.org.
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Bacula 1.34 User's Guide The Network Backup Solution | Copyright © 2000-2004 Kern Sibbald and John Walker