DB2 installation

2010-09-20T05:57:09Z

MaxZinal: /* Set VE resource limits appropriately */

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, as described in [[Debian template creation]].

== 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

{{Inconsistent UBC warning}}

These are tested resource limits for x86-64 system running Debian/GNU Linux 5.0.6 (the settings above did not work very well):

* kmemsize to 26214400:29491200
* privvmpages to 2097152:unlimited
* shmpages to 1572864
* numproc to 400
* tcpsndbuf to 1720320:2703360
* tcprcvbuf to 1720320:2703360
* vmguardpages to 2097152:unlimited
* oomguardpages to 26112:unlimited

And according to DB2 9 documentation, the following minimal guest kernel options must be set in /etc/sysctl.conf:
<pre>kernel.shmmax = 1073741824
kernel.sem = 250 256000 32 1024
kernel.msgmax = 65535
kernel.msgmnb = 65535</pre>

== 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 VE. 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 dbadm on database to user fred
connect reset

== Enjoy! ==

Please provide feedback in the discussion (Talk) page about improvements to this HOWTO.

[[Category:HOWTO]]

DB2 installation

2010-09-20T05:53:29Z

MaxZinal: /* Set VE resource limits appropriately */

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, as described in [[Debian template creation]].

== 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

{{Inconsistent UBC warning}}

These are tested resource limits for x86-64 system running Debian/GNU Linux 5.0.6 (the settings above did not work very well):

* kmemsize to 26214400:29491200
* privvmpages to 2097152:unlimited
* shmpages to 1572864
* numproc to 400
* tcpsndbuf to 1720320:2703360
* tcprcvbuf to 1720320:2703360
* vmguardpages to 2097152:unlimited
* oomguardpages to 26112:unlimited

== 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 VE. 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 dbadm on database to user fred
connect reset

== Enjoy! ==

Please provide feedback in the discussion (Talk) page about improvements to this HOWTO.

[[Category:HOWTO]]

OpenVZ Virtuozzo Containers Wiki - User contributions [en]

DB2 installation

DB2 installation