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9.2. Deploying and Undeploying Storage Nodes
There can be multiple metrics storage nodes in the JBoss ON environment. Much like the JBoss ON servers can operate in a high availability cloud, multiple storage nodes are deployed in the same environment and communicate with each other to function in a cluster.
Nodes can be added and removed from the cluster by administrators or dynamically using JBoss ON scripts in response to changes in the environment.
Note
A companion agent is always installed with a storage node to enable server-node communication.
With the default cluster configuration, a node is deployed as soon as it is installed and configured in the JBoss ON server. These are actually two separate steps.
- The bits are installed on a local system and the storage node is registered with the JBoss ON server.
- The new node information is deployed to the cluster.
Whether to deploy nodes automatically or manually can be determined by the provisioning and monitoring requirements of the environment.
Warning
Deploying a node lists that node's host in the cluster configuration and any allowed host can gain access to the data in the storage cluster.
Restrict access to the
rhq-storage-auth.conf file so that the allowed hosts list cannot be altered to allow an attacker to gain access to the cluster and the stored data.
9.2.1. Storage Node Requirements
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There are two critical requirements for deploying nodes:
- The hostnames or IP addresses of all storage nodes and the hostname and bind addresses of the JBoss ON server and agents must all be fully-resolvable in DNS. If the IP addresses and hostnames of the storage nodes, servers, or agents are not properly formatted in DNS, then all communication between the different JBoss ON components will fail.
- The firewall must allow communication over the two ports used by the storage nodes. By default, the ports are 9142 and 7100 for the server/client and gossip ports, respectively.
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