In the [previous article](https://www.2ndquadrant.com/en/2011/12/a-greenplum-41-handbook.html) we have seen how to install Greenplum on multiple nodes.
After installation steps, we must init the entire system.
Let’s see how.
## Actual situation
If tou have followed previous article, you have a Greenplum installed on multiple nodes.
Standar procedure when dealing with a Greenplum database, as well as Postgres, is composed by:
* Database Start
In this article, we will see the second and third steps: initializating and starting the database.
## Database initialization
The script that do the job here is
gpinitsystem needs a special configuration file, who contains a list of segment host addresses *only*.
Let’s name it
segment-hostname-1 segment-hostname-2 ...
One more file is needed, its name is
gpinitsystem_config. It contains a lot of parameters to configure your system.
An example configration file, to be used as a template, is in
You can copy that example file and modify it to suits your needs.
A detailed list of all parameter meanings is on Admin Guide at page 67.
The very important part of the file is:
ARRAY_NAME="EMC Greenplum DW" PORT_BASE=40000 declare -a DATA_DIRECTORY=(/data1/primary /data1/primary /data1/primary /data2/primary /data2/primary /data2/primary) MASTER_HOSTNAME=master-hostname MASTER_DIRECTORY=/data/master MASTER_PORT=5432
Now you can run the
gpinitsystem utility with those two files as parameters, this way:
$ gpinitsystem -c gpinitsystem_config -h hostfile_gpinitsystem
After a succesfully initialization you will see a kind message:
Greenplum Database instance successfully create+.
In case of failure, it is possible to get a partially installed system.
Because of that, after a failure in
gpinitsystem Greenplum automatically creates a “rollback” script
that can be executed to cleanup things around.
An example cleanup script file would be named:
Is it possible to execute that using GNU bash:
$ sh backout_gpinitsystem_gpadmin_20111216_121053
All Greenplum files partially installed will be removed.
That’s all for now.
I hope that this article, together with the
[previous one](https://www.2ndquadrant.com/en/2011/12/a-greenplum-41-handbook.html), will show you
how easy Greenplum installation is.