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This article is about how to use the Cat interface for status query in ElasticSearch. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Status query Cat interface node information

The interface GET _ cat/nodes?v lists all node and displays the running status information of the machine where node resides.

Ip heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name

127.0.0.1 13 41 10 mdi-node-2

127.0.0.1 15 41 9 mdi * node-1

Percentage of heap.percent heap memory consumption

Percentage of ram.percent memory footprint

Percentage of cpu CPU occupied

Master * indicates that the node is the master node in the cluster

Name node name

Note: in this paper, the author runs two Elasticsearch nodes on his own machine, so the ip is the same. But the port and node names of the two nodes are different.

Each node machine stores information

The interface GET _ cat/allocation?v lists all node and displays the configuration information of the machine to which it belongs.

Shards disk.indices disk.used disk.avail disk.total disk.percent host ip node

6 24.7kb 36.2gb 33.9gb 70.2gb 51 127.0.0.1 127.0.0.1 node-2

6 24.7kb 36.2gb 33.9gb 70.2gb 51 127.0.0.1 127.0.0.1 node-1

The number of fragments carried by the shards node

The amount of space occupied by the disk.indices index

The machine where the disk.used node resides has used disk space

IP address of the machine to which the ip node belongs

Node node name

Index information

The interface GET _ cat/indices?v lists all indexes and shows the basic information of the index

Health status index uuid pri rep docs.count docs.deleted store.size pri.store.size

Green open .kibana FHyzVY-nRXi9bFQZuPhbsg 1 1 2 0 16.8kb 8.4kb

Green open xenoblade 118dhMMHToGq-bh6p_MpVg 5 1 3 0 32.5kb 16.2kb

Health status of the health index

Index index name

Number of main shards in pri index

Number of rep index replication shards

Total storage space occupied by store.size index master shard replication shard

Pri.store.size index occupies total space, and does not calculate the space occupied by replication fragments.

Fragment information

The interface GET _ cat/shards?v lists all the shards in the cluster and shows the basic information

Index shard prirep state docs store ip node

Xenoblade 3 r STARTED 1 5.4kb 127.0.0.1 node-1

Xenoblade 3 p STARTED 1 5.4kb 127.0.0.1 node-2

Xenoblade 4 p STARTED 1 5.5kb 127.0.0.1 node-1

Xenoblade 4 r STARTED 1 5.5kb 127.0.0.1 node-2

Xenoblade 2 p STARTED 1 4.9kb 127.0.0.1 node-1

Xenoblade 2 r STARTED 1 4.9kb 127.0.0.1 node-2

Xenoblade 1 r STARTED 0 162b 127.0.0.1 node-1

Xenoblade 1 p STARTED 0 162b 127.0.0.1 node-2

Xenoblade 0 p STARTED 0 162b 127.0.0.1 node-1

Xenoblade 0 r STARTED 0 162b 127.0.0.1 node-2

.kibana 0 p STARTED 2 8.4kb 127.0.0.1 node-1

.kibana 0 r STARTED 2 8.4kb 127.0.0.1 node-2

Index Index name

Shard fragment serial number

Prirep p indicates that the shard is the main shard, and r indicates that the shard is a replication shard.

Store the shard takes up storage space

Node name of the node to which the node belongs

Number of documents stored in docs fragments

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