DB2 Express-C is a fully functional and very powerful database offering from IBM, that can be used for free. Currently it’s limited to two cores and 4GB RAM, that’s enough to be used in small-medium applications.
DB2 plays well with LXC, and I had no problem using it for years in a hosted server environment.
It’s been a while since my last post in this subject. I’ve been running DB2 9.7 in a Debian based LXC container without a glitch for about 5 years. After a distribution upgrade of the Ubuntu host, the 9.7 gave up and I was left with the dilemma of either staying on an old and insecure core distribution, or upgrading the entire stack.
Installing the DB2 Express-C 10.5 is a breeze when compared to previous versions. A couple of simple commands and you’re done. Upgrading from a previous version is almost as simple. Still it does take some preparation, and I advise anyone trying to do it to exercise caution.
In this article I assume you already have a single database instance you want to upgrade. The database is installed using the standard locations and users.
My host installation is done in a fresh amd64 LXC install from the Ubuntu template. The DB I’m upgrading from has been copied from it’s original 32bit container to the corresponding locations (/opt/ibm/db2, /home/dbsinst1, /home/dasusr1) in the fresh host. The users, groups, services are added to the corresponding /etc files, the /opt/ibm/db2 folders and the /var/lib/db2 folders are copied.
Before copying make sure the original container is shut down properly!
Download the installer for your architecture from IBM. Extract the files to /opt/ibm/db2 folder in your target machine.
Add prerequisites for the latest version that DB2 installer complains about.
./db2prereqcheck -l Requirement not matched for DB2 database "Server" . Version: "10.5.0.4". Summary of prerequisites that are not met on the current system: DBT3514W The db2prereqcheck utility failed to find the following 32-bit library file: "/lib/i386-linux-gnu/libpam.so*". DBT3514W The db2prereqcheck utility failed to find the following 32-bit library file: "libstdc++.so.6". Requirement not matched for DB2 database "Server" with pureScale feature. Version: "10.5.0.4". Summary of prerequisites that are not met on the current system: DBT3514W The db2prereqcheck utility failed to find the following 32-bit library file: "/lib/i386-linux-gnu/libpam.so*". DBT3514W The db2prereqcheck utility failed to find the following 32-bit library file: "libstdc++.so.6".
Start adding the missing requirements. DB2 still requires 32 bit libs for running.
apt-get install binutils libaio1 dpkg --add-architecture i386 apt-get update apt-get install libpam0g:i386 libstdc++6:i386
Start DB2 installation.
./db2_install DBI1324W Support of the db2_install command is deprecated. For more information, see the DB2 Information Center. Default directory for installation of products - /opt/ibm/db2/V10.5 *********************************************************** Install into default directory (/opt/ibm/db2/V10.5) ? [yes/no] yes DB2 installation is being initialized. Total number of tasks to be performed: 36 Total estimated time for all tasks to be performed: 1370 second(s) ... <SNIP> ... Task #38 start Description: Updating global profile registry Estimated time 3 second(s) Task #38 end The execution completed successfully. For more information see the DB2 installation log at "/tmp/db2_install.log.14621".
You can now remove the installation folder if you want to.
Add the libs to run 32 bit DB2 9.7
apt-get install libaio1:i386
Check to see if the upgrade can be completed on the databases
# su - db2inst1 $ db2start $ /opt/ibm/db2/expc/db2ckupgrade -e -l /tmp/upgrade_v10.5.log DBT5508I The db2ckupgrade utility completed successfully. The database or databases can be upgraded. $ cat /tmp/upgrade_v10.5.log Version of DB2CKUPGRADE being run: VERSION "10.5" Database: "MYDB" DBT5537I The db2ckupgrade utility has completed processing for database "MYDB". DBT5508I The db2ckupgrade utility completed successfully. The database or databases can be upgraded. $ db2 force application all DB20000I The FORCE APPLICATION command completed successfully. DB21024I This command is asynchronous and may not be effective immediately. $ db2 terminate DB20000I The TERMINATE command completed successfully. $ db2stop SQL1064N DB2STOP processing was successful. $ exit #
Upgrade databases see the infocenter
# /opt/ibm/db2/V10.5/instance/db2iupgrade -u db2fenc1 db2inst1 DBI1446I The db2iupgrade command is running. DB2 installation is being initialized. Total number of tasks to be performed: 4 Total estimated time for all tasks to be performed: 309 second(s) Task #1 start Description: Setting default global profile registry variables Estimated time 1 second(s) Task #1 end Task #2 start Description: Initializing instance list Estimated time 5 second(s) Task #2 end Task #3 start Description: Configuring DB2 instances Estimated time 300 second(s) Task #3 end Task #4 start Description: Updating global profile registry Estimated time 3 second(s) Task #4 end The execution completed successfully. For more information see the DB2 installation log at "/tmp/db2iupgrade.log.7476". DBI1070I Program db2iupgrade completed successfully.
That was easy, now we can start the database up and upgrade it.
# su - db2inst1 $ db2start $ db2 LIST DATABASE DIRECTORY System Database Directory Number of entries in the directory = 1 Database 1 entry: Database alias = MYDB Database name = MYDB Local database directory = /home/db2inst1 Database release level = d.00 Comment = Directory entry type = Indirect Catalog database partition number = 0 Alternate server hostname = Alternate server port number = $ db2 UPGRADE DATABASE MYDB DB20000I The UPGRADE DATABASE command completed successfully. $ db2 connect to MYDB Database Connection Information Database server = DB2/LINUXX8664 10.5.4 SQL authorization ID = DB2INST1 Local database alias = MYDB
Get rid of the obsolate DAS
After DB2 9.7 DAS is discouraged to be used. It’s best to get rid of it once and for all.
# /opt/ibm/db2/V9.7/instance/daslist dasusr1 # /opt/ibm/db2/V9.7/instance/dasdrop SQL4410W The DB2 Administration Server is not active. DBI1070I Program dasdrop completed successfully.
Get rid of the obsolete users as well.
# userdel -r dasusr1 # groupdel dasadm1
Remove old installation
You can remove the old install using the procedure described here
# /opt/ibm/db2/V9.7/install/db2_deinstall -a