一、官网下载Elasticsearch，解压到指定路径paht，启动单个/多个elasticsearch节点，配置相同的cluster_name

./path/elasticsearch-xx/bin/elasticsearch -d

二、检查启动是否成功：

curl "http://localhost:9200"

三、集群健康状态检查

status枚举

• green-所有主分片和副本分片都正常

• yellow-所有主分片正常，有副本分片不正常

• red-有主分片不正常

    curl "http://localhost:9200/_cluster/health"
    {
        "cluster_name":"yyc-elasticsearch",
        "status":"yellow",//green-正常,yellow-所有主正常,有分片不正常,red-有主不正常
        "timed_out":false,
        "number_of_nodes":1,
        "number_of_data_nodes":1,
        "active_primary_shards":5,
        "active_shards":5,
        "relocating_shards":0,
        "initializing_shards":0,
        "unassigned_shards":5,
        "delayed_unassigned_shards":0,
        "number_of_pending_tasks":0,
        "number_of_in_flight_fetch":0,
        "task_max_waiting_in_queue_millis":0,
        "active_shards_percent_as_number":50
    }

四、集群修复
red状态时通过下面连接查看所有索引信息确定是那个索引导致集群red，如果索引不重要可删除索引，集群回复

   curl "http://localhost:9200/_cluster/health?level=indices"
    {
        "...":"...",
        "indices":{
            "person":{
                "status":"yellow",//索引状态，与集群状态一致
                "number_of_shards":5,
                "number_of_replicas":1,
                "active_primary_shards":5,
                "active_shards":5,
                "relocating_shards":0,
                "initializing_shards":0,
                "unassigned_shards":5
            }
        }
    }

yellow状态时是有副本分片不正常，就是有索引未分配。Elasticsearch默认有1个副本且主分片和副本不能在同一节点上，所以单节点时集群状态是yellow，副本未分配

    curl "http://localhost:9200/_cat/shards"
    索引名  分片编号 p(主分片)/r(副本)  S(已分配)/U(未分配)
    person   2     p                STARTED            1 4.8kb 127.0.0.1 NQvFqpC
    person   2     r                UNASSIGNED                   
    person   3     p                STARTED            0  262b 127.0.0.1 NQvFqpC
    person   3     r                UNASSIGNED                   
    person   1     p                STARTED            0  264b 127.0.0.1 NQvFqpC
    person   1     r                UNASSIGNED                   
    person   4     p                STARTED            1 5.5kb 127.0.0.1 NQvFqpC
    person   4     r                UNASSIGNED                   
    person   0     p                STARTED            0  264b 127.0.0.1 NQvFqpC
    person   0     r                UNASSIGNED                   

查询出未分配的索引后，手动分配即可解决问题