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Chapter 8. Health monitoring

Red Hat Data Grid server has special endpoints for monitoring cluster health. The API is exposed via:

8.1. Accessing Health API using JMX
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At first you need to connect to the Red Hat Data Grid Server using JMX (use JConsole or other tool for this). Next, navigate to object name jboss.datagrid-infinispan:type=CacheManager,name="clustered",component=CacheContainerHealth.

8.2. Accessing Health API using CLI
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You can access the Health API from the Command Line Interface (CLI), as in the following examples:

Standalone
$ bin/cli.sh -c "/subsystem=datagrid-infinispan/cache-container=clustered/health=HEALTH:read-resource(include-runtime=true)"
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Domain Mode
$ bin/cli.sh -c "/host=master/server=${servername}/subsystem=datagrid-infinispan/cache-container=clustered/health=HEALTH:read-resource(include-runtime=true)"
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Where ${servername} is the name of the Red Hat Data Grid server instance.

The following is a sample result for the CLI invocation: 

{
    "outcome" => "success",
    "result" => {
        "cache-health" => "HEALTHY",
        "cluster-health" => ["test"],
        "cluster-name" => "clustered",
        "free-memory" => 99958L,
        "log-tail" => [
            "<time_stamp> INFO  [org.infinispan.server.endpoint] (MSC service thread 1-5) DGENDPT10001: HotRodServer listening on 127.0.0.1:11222",
            "<time_stamp> INFO  [org.infinispan.server.endpoint] (MSC service thread 1-1) DGENDPT10001: MemcachedServer listening on 127.0.0.1:11211",
            "<time_stamp> INFO  [org.jboss.as.clustering.infinispan] (MSC service thread 1-6) DGISPN0001: Started ___protobuf_metadata cache from clustered container",
            "<time_stamp> INFO  [org.jboss.as.clustering.infinispan] (MSC service thread 1-6) DGISPN0001: Started ___script_cache cache from clustered container",
            "<time_stamp> INFO  [org.jboss.as.clustering.infinispan] (MSC service thread 1-5) DGISPN0001: Started ___hotRodTopologyCache cache from clustered container",
            "<time_stamp> INFO  [org.infinispan.rest.NettyRestServer] (MSC service thread 1-6) ISPN012003: REST server starting, listening on 127.0.0.1:8080",
            "<time_stamp> INFO  [org.infinispan.server.endpoint] (MSC service thread 1-6) DGENDPT10002: REST mapped to /rest",
            "<time_stamp> INFO  [org.jboss.as] (Controller Boot Thread) WFLYSRV0060: Http management interface listening on http://127.0.0.1:9990/management",
            "<time_stamp> INFO  [org.jboss.as] (Controller Boot Thread) WFLYSRV0051: Admin console listening on http://127.0.0.1:9990",
            "<time_stamp> INFO  [org.jboss.as] (Controller Boot Thread) WFLYSRV0025: Red Hat Data Grid Server <build_version> (WildFly Core <build_version>) started in 8681ms - Started 196 of 237 services (121 services are lazy, passive or on-demand)"
        ],
        "number-of-cpus" => 8,
        "number-of-nodes" => 1,
        "total-memory" => 235520L
    }
}
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8.3. Accessing Health API using REST
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The REST interface lets you access the same set of resources as the CLI. However, the HTTP Management API requires authentication so you must first add credentials with the add-user.sh script.

After you set up credentials, access the Health API via REST as in the following examples:

Standalone
curl --digest -L -D - "http://localhost:9990/management/subsystem/datagrid-infinispan/cache-container/clustered/health/HEALTH?operation=resource&include-runtime=true&json.pretty=1" --header "Content-Type: application/json" -u username:password
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Domain Mode
curl --digest -L -D - "http://localhost:9990/management/host/master/server/${servername}/subsystem/datagrid-infinispan/cache-container/clustered/health/HEALTH?operation=resource&include-runtime=true&json.pretty=1" --header "Content-Type: application/json" -u username:password
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Where ${servername} is the name of the Red Hat Data Grid server instance.

The following is a sample result for the REST invocation: 

HTTP/1.1 200 OK
Connection: keep-alive
Authentication-Info: nextnonce="AuZzFxz7uC4NMTQ3MDgyNTU1NTQ3OCfIJBHXVpPHPBdzGUy7Qts=",qop="auth",rspauth="b518c3170e627bd732055c382ce5d970",cnonce="NGViOWM0NDY5OGJmNjY0MjcyOWE4NDkyZDU3YzNhYjY=",nc=00000001
Content-Type: application/json; charset=utf-8
Content-Length: 1927
Date: <time_stamp>

{
    "cache-health" : "HEALTHY",
    "cluster-health" : ["test", "HEALTHY"],
    "cluster-name" : "clustered",
    "free-memory" : 96778,
    "log-tail" : [
        "<time_stamp> INFO  [org.infinispan.server.endpoint] (MSC service thread 1-5) DGENDPT10001: HotRodServer listening on 127.0.0.1:11222",
        "<time_stamp> INFO  [org.infinispan.server.endpoint] (MSC service thread 1-1) DGENDPT10001: MemcachedServer listening on 127.0.0.1:11211",
        "<time_stamp> INFO  [org.jboss.as.clustering.infinispan] (MSC service thread 1-6) DGISPN0001: Started ___protobuf_metadata cache from clustered container",
        "<time_stamp> INFO  [org.jboss.as.clustering.infinispan] (MSC service thread 1-6) DGISPN0001: Started ___script_cache cache from clustered container",
        "<time_stamp> INFO  [org.jboss.as.clustering.infinispan] (MSC service thread 1-5) DGISPN0001: Started ___hotRodTopologyCache cache from clustered container",
        "<time_stamp> INFO  [org.infinispan.rest.NettyRestServer] (MSC service thread 1-6) ISPN012003: REST server starting, listening on 127.0.0.1:8080",
        "<time_stamp> INFO  [org.infinispan.server.endpoint] (MSC service thread 1-6) DGENDPT10002: REST mapped to /rest",
        "<time_stamp> INFO  [org.jboss.as] (Controller Boot Thread) WFLYSRV0060: Http management interface listening on http://127.0.0.1:9990/management",
        "<time_stamp> INFO  [org.jboss.as] (Controller Boot Thread) WFLYSRV0051: Admin console listening on http://127.0.0.1:9990",
        "<time_stamp> INFO  [org.jboss.as] (Controller Boot Thread) WFLYSRV0025: Red Hat Data Grid Server <build_version> (WildFly Core <build_version>) started in 8681ms - Started 196 of 237 services (121 services are lazy, passive or on-demand)"
    ],
    "number-of-cpus" : 8,
    "number-of-nodes" : 1,
    "total-memory" : 235520
}%
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Note that the result from the REST API is exactly the same as the one obtained by CLI.

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