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Working with Applications
MemVerge provides additional instructions for some popular applications supported by Memory Machine, either to assist with complex setup or to support additional functionality.
Working with Hazelcast Clusters
Using MemVerge Memory Machine, you can manage the hosts of a Hazelcast cluster, capture snapshots of the cluster, and restore snapshotted clusters.
Preparing Memory Machine to Work with Hazelcast
To prepare for taking snapshots of the Hazelcast cluster, install Memory Machine and provide the Hazelcast credentials to all hosts in the cluster.

Overview and Installation
Getting started with MemVerge Memory Machine requires that you understand some background information about how persistent memory works. You can then install Memory Machine on a server and begin monitoring memory usage and capturing application snapshots.
Using the Memory Machine Management Center
Memory Machine Management Center (M3C) is a web UI application available on the host that is running the Memory Machine Management Service. You can view system resources and performance metrics; create and restore snapshots; schedule jobs; and more in M3C.
Using the Command Line Interface
You can administer and use MemVerge Memory Machine using the Command Line Interface (CLI) on any installed host.
Working with Applications
MemVerge provides additional instructions for some popular applications supported by Memory Machine, either to assist with complex setup or to support additional functionality.
- Working with Hazelcast Clusters
  Using MemVerge Memory Machine, you can manage the hosts of a Hazelcast cluster, capture snapshots of the cluster, and restore snapshotted clusters.
  - Preparing Memory Machine to Work with Hazelcast
    To prepare for taking snapshots of the Hazelcast cluster, install Memory Machine and provide the Hazelcast credentials to all hosts in the cluster.
  - Preparing Hazelcast to Work with Memory Machine
    To prepare Hazelcast to work with Memory Machine Cluster Snapshot you must configure Hazelcast on each host; create a user that belongs to the Memory Machine mvmm group; run Hazelcast on each host in Active state as a background process; and register the Hazelcast cluster with Memory Machine.
  - Capturing a Cluster Snapshot
    After configuring Memory Machine and Hazelcast, use the mvmcli cluster snapshot command to capture a snapshot of the cluster state.
  - Restoring a Cluster Snapshot
    Use the mvmcli cluster snaprestore command to capture a snapshot of the cluster state.
  - Deleting Cluster Snapshots
    Delete a cluster snapshot using the mvmcli cluster snapdelete command on the Primary Coordinator host.
  - Working with Clusters in Memory Machine Management Center
    Create and capture and restore snapshots of a Hazelcast cluster from the command line or Memory Machine Management Center.
  - Troubleshooting Hazelcast Cluster Snapshot
- Working with KVM in Memory Machine
  Running KVMs in Memory Machine requires extra setup and configuration.
- Working with Redis in Memory Machine
All Documentation
Links to all technical documentation for MemVerge Memory Machine including previous releases.

Preparing Memory Machine to Work with Hazelcast

To prepare for taking snapshots of the Hazelcast cluster, install Memory Machine and provide the Hazelcast credentials to all hosts in the cluster.

About this task

Repeat the following steps on every host in a Hazelcast cluster to prepare to capture a snapshot of the cluster.

Procedure

Install Memory Machine on the host. See Installing MemVerge Memory Machine.
Start the mvcsnapd service:
```
# systemctl start mvcsnapd
#
```
Configure the mvcsnapd service to start on system boot:
```
# systemctl enable mvcsnapd
```
Stop any application instances running in Memory Machine. See Stopping an Application Instance.
Restart the Memory Machine MVMAS:
```
# systemctl restart mvmallocd
#
```
In the mvm_cluster_snapshot_hazelcast.sh script, if the hazelcast cluster hostnames cannot be resolved using DNS server lookup, declare ip_host_map to define all the cluster host names. For example:
```
declare -A ip_host_map=(
  ["0.0.0.1"]="example.memverge.com"
  ["10.0.1.100"] = "host-a.memverge.com"
  ["10.0.1.111"] = "host-b.memverge.com"
)
```

What to do next

Configure the Hazelcast cluster to work with Memory Machine. See Preparing Hazelcast to Work with Memory Machine.