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How to get DB2 Express-C going in a Virtual Environment
DB2 has been certified by IBM for use inside Virtuozzo. It works in OpenVZ too!
IBM provides a free download of DB2 Express-C which is what I
installed.
Here is a rough guide to installing DB2 into a freshly-created VE.
== Create a new VE ==
I created a new VE for the Debian distribution using debootstrap.
== Set VE resource limits appropriately ==
DB2 installation can fail and it will not be possible to operate the database if your resource limits are too low. I used these limits for a small database:
* kmemsize to 10,000,000
* privvmpages to 300,000
* shmpages to 80,000
* numproc to 150
* tcpsndbuf to 700,000
* tcprcvbuf to 700,000
* diskspace to 6,000,000
== Install additional packages ==
* libstdc++5 (required for installation)
* pdksh (required for operation?)
* ssh (may be required for operation)
* xbase-clients (for xauth)
* firefox (for post-installation)
* strace and telnet (for debugging)
* libdbi-perl gcc libc6-dev make (for building CPAN DBD::DB2 package)
== Download the DB2 Express-C package ==
DB2 Express-C version 9 is available from this page:
[[http://www-306.ibm.com/software/data/db2/express/download.html]]
You will need to register with IBM before you can download.
* Untar the received file as root
* Run exp/disk1/db2setup
* Follow the prompts:
* Setup user 'dasusr1'
* Setup user 'db2inst1' and database instance 'db2inst1'
== Post-install actions ==
This is where it gets yukky. DB2 wants to run a browser inside the VPS. It wants to run Java applets inside the browser. I installed Iceweasel, but the post-install script does not recognise it. I was eventually able to hack the script to recognise and use the browser but it crashed on one of the Java applets. I think you can get by without running the post-install.
Here's what to do instead:
First, su to the instance owner:
* su - db2inst1
Try starting and stopping the database:
* db2start
* db2stop
If these don't work it means your environment variables are not set properly. IBM set these for me:
* CLASSPATH=/home/db2inst1/sqllib/java/db2java.zip:/home/db2inst1/sqllib/java/db2jcc.jar:/home/db2inst1/sqllib/java/sqlj.zip:/home/db2inst1/sqllib/function:/home/db2inst1/sqllib/java/db2jcc_license_cu.jar:.
* DB2INSTANCE=db2inst1
* PATH=/usr/local/bin:/usr/bin:/bin:/usr/games:/home/db2inst1/sqllib/bin:/home/db2inst1/sqllib/adm:/home/db2inst1/sqllib/misc
Try creating IBM's sample database:
* db2sampl
== Setup a development environment ==
I develop in perl so I was most interested in access to the database though the DBI library. I did this:
* Use CPAN to download and install DBD::DB2
If you don't use CPAN you can also do this (as root):
* Download http://search.cpan.org/CPAN/authors/id/I/IB/IBMTORDB2/DBD-DB2-1.1.tar.gz
* Untar the file and change into the directory
* perl Makefile.PL PREFIX=/usr
* make
* make test
* make install
== Setup DB2 for autostart ==
It seems that DB2 can be auto-started at VE boot time, but not auto-stopped. I used this script:
#!/bin/sh
#
# Script to start DB2 instances on bootup.
#
set -e
. /lib/lsb/init-functions
case "$1" in
start)
echo Starting DB2
/opt/ibm/db2/V9.1/instance/db2istrt
;;
stop)
;;
restart|reload)
;;
esac
exit 0
And I used this command to create the symlink to make it start at VE "boot" time:
* update-rc.d db2 start 95 2 .
== Testing your installation ==
From the db2inst1 user, do:
* db2
Inside the db2 client, try:
* connect to sample
* grant all privileges to user fred (?not sure?)
* connect reset
IBM provides a free download of DB2 Express-C which is what I
installed.
Here is a rough guide to installing DB2 into a freshly-created VE.
== Create a new VE ==
I created a new VE for the Debian distribution using debootstrap.
== Set VE resource limits appropriately ==
DB2 installation can fail and it will not be possible to operate the database if your resource limits are too low. I used these limits for a small database:
* kmemsize to 10,000,000
* privvmpages to 300,000
* shmpages to 80,000
* numproc to 150
* tcpsndbuf to 700,000
* tcprcvbuf to 700,000
* diskspace to 6,000,000
== Install additional packages ==
* libstdc++5 (required for installation)
* pdksh (required for operation?)
* ssh (may be required for operation)
* xbase-clients (for xauth)
* firefox (for post-installation)
* strace and telnet (for debugging)
* libdbi-perl gcc libc6-dev make (for building CPAN DBD::DB2 package)
== Download the DB2 Express-C package ==
DB2 Express-C version 9 is available from this page:
[[http://www-306.ibm.com/software/data/db2/express/download.html]]
You will need to register with IBM before you can download.
* Untar the received file as root
* Run exp/disk1/db2setup
* Follow the prompts:
* Setup user 'dasusr1'
* Setup user 'db2inst1' and database instance 'db2inst1'
== Post-install actions ==
This is where it gets yukky. DB2 wants to run a browser inside the VPS. It wants to run Java applets inside the browser. I installed Iceweasel, but the post-install script does not recognise it. I was eventually able to hack the script to recognise and use the browser but it crashed on one of the Java applets. I think you can get by without running the post-install.
Here's what to do instead:
First, su to the instance owner:
* su - db2inst1
Try starting and stopping the database:
* db2start
* db2stop
If these don't work it means your environment variables are not set properly. IBM set these for me:
* CLASSPATH=/home/db2inst1/sqllib/java/db2java.zip:/home/db2inst1/sqllib/java/db2jcc.jar:/home/db2inst1/sqllib/java/sqlj.zip:/home/db2inst1/sqllib/function:/home/db2inst1/sqllib/java/db2jcc_license_cu.jar:.
* DB2INSTANCE=db2inst1
* PATH=/usr/local/bin:/usr/bin:/bin:/usr/games:/home/db2inst1/sqllib/bin:/home/db2inst1/sqllib/adm:/home/db2inst1/sqllib/misc
Try creating IBM's sample database:
* db2sampl
== Setup a development environment ==
I develop in perl so I was most interested in access to the database though the DBI library. I did this:
* Use CPAN to download and install DBD::DB2
If you don't use CPAN you can also do this (as root):
* Download http://search.cpan.org/CPAN/authors/id/I/IB/IBMTORDB2/DBD-DB2-1.1.tar.gz
* Untar the file and change into the directory
* perl Makefile.PL PREFIX=/usr
* make
* make test
* make install
== Setup DB2 for autostart ==
It seems that DB2 can be auto-started at VE boot time, but not auto-stopped. I used this script:
#!/bin/sh
#
# Script to start DB2 instances on bootup.
#
set -e
. /lib/lsb/init-functions
case "$1" in
start)
echo Starting DB2
/opt/ibm/db2/V9.1/instance/db2istrt
;;
stop)
;;
restart|reload)
;;
esac
exit 0
And I used this command to create the symlink to make it start at VE "boot" time:
* update-rc.d db2 start 95 2 .
== Testing your installation ==
From the db2inst1 user, do:
* db2
Inside the db2 client, try:
* connect to sample
* grant all privileges to user fred (?not sure?)
* connect reset
