Workflow: Add a backend host
Expanding a cluster with a new backend host is similar to the Weka system installation process using the CLI.
Add a backend host to an existing cluster
Stage 1: Obtain the Weka install file
Download the Weka Install File used when the existing cluster was last upgraded (or formed, if not upgraded)..
Use the weka status
command to show the current cluster install file version.
See Obtain the Weka software installation package
Stage 2: Install the Weka software on the new host
Run the untar
command and install.sh
command on the new host.
At the end of the installation process, the host is in stem mode (the host is not attached to a cluster).
Stage 3: Add the host to the cluster
Command: weka cluster host add
On any host that is part of the cluster, run the following command line:
weka cluster host add <backend-hostname>
Parameters:
Name
Type
Value
Limitations
Mandatory
Default
backend-hostname
String
IP/hostname of the new backend host to add
Valid hostname (DNS or IP)
Yes
Stage 4: Configure the networking
Perform the instructions in Weka cluster installation.
Stage 5: Configure the CPU resources
Perform the instructions in Weka cluster installation.
Stage 6: Apply the host's configuration
Apply the configuration on the newly added host. Perform the instructions in Weka cluster installation.
Stage 7: Configure the SSDs
Perform the instructions in Weka cluster installation.
Expand the cluster by importing the host settings
In most cases, the host configurations are similar. Therefore, it is possible to import the host setting from a previously exported host in the cluster, saving time and avoiding misconfiguration.
Procedure:
Perform only stages 1 to 3 in the Add a backend host to an existing cluster procedure (above).
Connect to one of the hosts in the cluster and export the settings by running the following command:
weka local resources export
.Connect to the new host and import the settings by running the following command:
weka local resources import
.Edit the local configuration. See the Local resources editing commands section.
Apply the configuration on the newly added host. See Weka cluster installation.
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