Managing Hosts How to use Cloudera Manager to configure and manage the hosts in your clusters. Viewing Host StatusYou can view summary information about the hosts managed by Cloudera Manager. You can view information for all hosts, the hosts in a cluster, or individual hosts.Adding a Host to a ClusterSteps to add hosts to a cluster.ParcelsConfiguring HostsThe Configuration tab lets you set properties related to parcels and to resource management, and also monitoring properties for the hosts under management. Viewing Host Role AssignmentsHost TemplatesThe Host Templates page lets you create and manage host templates, which provide a way to specify a set of role configurations that should be applied to a host. Hosts Disks OverviewHow to view the status of all disks in a cluster. Deleting HostsStopping All the Roles on a HostYou can stop all of the roles on a host from the Hosts page.Starting All the Roles on a HostYou can start all the roles on a host from the Hosts page.Changing HostnamesAfter you have installed Cloudera Manager and created a cluster, you may need to update the names of the hosts running the Cloudera Manager Server or cluster services.Moving a Host Between ClustersTo move a host between clusters, you must first decommission the host, remove roles from the host, and complete other tasks.Using Upgrade Domains to manage rolling restartsUpgrade Domains allow to group cluster hosts for optimal performance during restarts and upgrades.Specifying Racks for HostsTo get maximum performance, it is important to configure CDH so that it knows the topology of your network. Network locations such as hosts and racks are represented in a tree, which reflects the network “distance” between locations. HDFS will use the network location to be able to place block replicas more intelligently to trade off performance and resilience.Performing Maintenance on a Cluster HostYou can perform minor maintenance on cluster hosts by using Cloudera Manager to manage the host decommission and recommission process.
