Installing Db2 pureScale with the db2_install command (Linux)

This topic guides you through the process of installing Db2 pureScale using the db2_install command on Linux.

Before you begin

Ensure you have created your Db2 pureScale Feature installation plan, that your system meets the prerequisites, and that you have performed the preinstallation tasks.

About this task

The manual installation process is outlined as follows:

Log in as root.
Run the db2_install command to install the Db2 database product on the installation-initiating host (IIH)
Run the db2icrt command on the IIH to create one member and one cluster caching facility. The db2icrt command will copy the Db2 database product to the second host and run the install process before creating the member and cluster caching facility.
Run the db2iupdt to add members and cluster caching facilities. The db2iupdt command will copy the Db2 database product to the new host and install it before creating the member or the CF.

Procedure

Make the Db2 installation image available. After downloading the Db2 database product image, decompress and untar the product file:
1. Decompress and untar the product file using the gunzip -c server.tar.gz | tar -xf - command, where product represents the name of the downloaded product.
2. Change directory using the cd ./server command
Log in as root.
On the IIH, to install the Db2 pureScale Feature, run the db2_install command. This command installs the Db2 database product, Pacemaker, Corosync, and IBM Storage Scale.
For example:
```
db2_install -b DB2DIR -p SERVER -f PURESCALE -t /tmp/db2_install.trc -l /tmp/db2_install.log
```
where DB2DIR represents the location where you want to install the Db2 pureScale Feature image. This path has to be the same on all the hosts. If the DB2DIR exists, it must be empty before the installation. The default DB2DIR is /opt/IBM/db2. The -t and -l options are recommended so that trace and log files are generated.
Verify that your Db2 database product is installed. Run the /usr/local/bin/db2ls command.
Verify that Pacemaker, Corosync, and IBM Storage Scale are installed on the system.
1. To verify the installation of Pacemaker, run:
```
rpm -aq | grep pacemaker
```
2. To verify the installation of Corrosion, run:
```
rpm -aq | grep corosync
```
3. To verify the installation of IBM Storage Scale, run:
```
rpm -aq | grep gpfs
```
Ensure the required users and groups are created (as detailed in your installation plan).
Run the following command as root to set up the initial Db2 pureScale instance specifying a host as a Db2 member and another host as a cluster caching facility. You can find the db2icrt command in the DB2DIR/instance directory. You can only specify one Db2 member and one cluster caching facility during the initial setup of the Db2 pureScale instance. You can add additional Db2 members and cluster caching facilities using the db2iupdt command.
Note:
- The netname represents the cluster interconnect netname which corresponds to the communication adapter port used for high speed communication between Db2 members and cluster caching facilities in the Db2 instance.
- For the host name, you need to use the same host name format as the return value of the hostname command.
- The /etc/hosts file must have this format:<IPADDRESS> <Long name with domain> <short name>
```
db2icrt -d -m member_hostname -mnet member_netname1
   -cf CF_hostname -cfnet CF_netname2
   -instance_shared_dev disk1_name
   -u fencedID instname
```
For example,
```
 db2icrt -d -m h1.domain.com -mnet h1.domain.com-ib0
   -cf h2.domain.com -cfnet h2.domain.com-ib0
   -instance_shared_dev /dev/hdisk1
   -u db2fenc1 db2sdin1
```
creates Db2 pureScale instance db2sdin1 with a Db2 member named h1.domain.com, a netname of h1.domain.com-ib0, and cluster caching facility h2.domain.com with a netname of h2.domain.com-ib0. It will also specify the shared file system device path as dev/hdisk1.

What to do next

You can add other hosts to your Db2 pureScale instance using the db2iupdt -add command.