You will need minimum one node with each node having “512MB” RAM and “6GB” free diskspace.

Further information can be found at http://www.open-sharedroot.org/comoonics-anaconda/ at the section example configurations.

The first step is to boot from the DVD. To install a Com.oonics Diskless Sharedroot Cluster, enter linux sharedroot at the bootscreen and confirm your input.

Continue to the next screen.

Select the base language for your cluster and continue.

Select the keyboard you are using in your cluster and continue.

Specify a name for your cluster, the nodename of the first node (defaults to node1) and choose the networkinterface to be used for locking and cluster traffic.

The journal numbers depict the number of nodes that are going take part in this cluster and mount the root filesystem.

The default layout which is created by a diskless sharedroot cluster installation contains a 1GB boot-partition with ext3 and a lvm-volumegroup (the name defaults to vg_“clustername”_sr) with 1GB swap and a root-filesystem formated with gfs, which allocates the rest of the free space in the volume group. If the computer has more than one hard disk it might be necessary to review the default layout, choose Review and modify partitioning Layout. If Create custom Layout is selected, this could be omitted as the storage configuration is completely up to the user. This option should only be used by experts.

If neither Create custom Layout nor Review and modify partitioning Layout is selected, the following steps are skipped and the installation proceeds with network configuration.

2.7.1. Customize default layout / apply user-defined layout

Edit the layout as needed.

2.7.2. Bootloader Configuration

If the computer contains more than one hard disk, choose Configure advanced boot loader options, otherwise you can leave the checkbox unchecked and skip the next step.

2.7.3. Advanced Bootloader Configuration

Use Change Drive Order to adjust the order of the shown devices to the bootorder of the machine. This step is needed to assure that the bootloader is installed at the proper location.

As a rule of thump you might select the disk where the /boot resides on. Also don't forget that both the boot and the root filesystem devices need to be shared.

The network device which was choosen at the clusteroptions should be configurated here.

Select the local region your cluster belongs to.

Specify a password for the root user.

The installer might already have chosen the required package groups “Clustering, Com.oonics Clustersuite” and “Storage Clustering” automaticaly. But recheck that at least the following groups are selected: Clustering, Comoonics Clustersuite and Storage Clustering.

Additional groups and packages might be added at will.

Please not, that the installation of the package kmod-gfs might take some time. Do not skip the installation here if the installation does not proceed for some minutes.

The post installation process includes the configuration of the diskless sharedroot cluster. It needs much more time to complete then the post install of a non cluster. So also be patient at this step.

If the whole installation process is finished successfully you can now safely reboot.

Unfortunately the firstboot configuration screen does not always start after the installation. To start firstboot manually, selinux has to be temporarily disabled using grub, because selinux prevents the user root to login.

Only proceed if the firstboot configuration screen does not come up automatically when the node is first booted.

3.1.1. Modify bootloader grub

It is possible to temporarily change the configuration of grub by using its editing mode. To enter this mode choose the entry to edit (normaly the first one) and confirm your choice by tapping e.

Choose the line beginning with kernel, enter editing mode by typing e and add selinux=0 or 1 to the end of the line.

Leave the editing mode by typing ESC and type b to boot.

3.1.2. Start firstboot

If firstboot does not start automatically, login and enter firstboot to start it manually.

Don't forget to disable selinux as it is not yet thoroughly tested with diskless sharedroot clusters. And also configure the firewall so that clustertraffic is left through (see http://www.opensharedroot.org/faq/administrators-handbook/cluster-system-administration/ports-being-in-use-by-the-red-hat-cluster-software).