ES集群模式安装配置入门

1.安装OpenJDK1.8+下载ES+5台服务器

"10.167.20.47"
"10.167.20.48"
"10.167.20.49"
"10.167.20.50"
"10.167.20.51"

2.创建新用户

创建新的用户，因为es要求这样。

//root下执行
adduser es  //创建用户，起名叫es
passwd es   //设置密码

建立文件夹，并将es解压

su es  //切换到es用户
mkdir /home/es
tar -zxvf ./elasticsearch-6.8.0.tar.gz /home/es/

3.配置ES

再创建两个文件夹

cd /home/es
mkdir data  //存放切片的数据
mkdir log   //存放结点日志

确保es文件夹下所有文件的owner属于用户es

[es@searchdbdl028cn home]$ ll
total 0
drwx------. 7 es es 157 Aug 27 14:17 es

如果不是要改

chown -R es ./es    //改完记得切回es用户

下面开始配置，cd到config目录下，vim elasticsearch.yml 每台都要配置

# ============================= My Configuration ===============================
#集群名称
cluster.name: es-cluster   
#该结点名称
node.name: node-02             
#该结点绑定的ip          
network.host: 10.167.20.48
#该节点对外提供服务端口
http.port: 9200          
#集群中所有结点                         
discovery.zen.ping.unicast.hosts: ["10.167.20.47", "10.167.20.48", "10.167.20.49", "10.167.20.50", "10.167.20.51"]
#当有的结点发生故障时，触发master竞选的最少活跃结点数
#一般设置为 [总结点数]/2 +1，可以防止脑裂。
discovery.zen.minimum_master_nodes: 4
#该结点存储数据位置
path.data: /home/es/data
#该结点输出日志位置
path.logs: /home/es/log

4.启动

启动的时候要切换到非root用户启动（这里设置了es用户），因为es内部有保护机制防止用root用户权限过多。

使用CentOS7启动的时候一般会由于系统配置不足产生问题

ERROR: [2] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[2019-08-27T17:11:33,262][INFO ][o.e.n.Node               ] [node-02] stopping ...
[2019-08-27T17:11:33,275][INFO ][o.e.n.Node               ] [node-02] stopped
[2019-08-27T17:11:33,276][INFO ][o.e.n.Node               ] [node-02] closing ...
[2019-08-27T17:11:33,284][INFO ][o.e.n.Node               ] [node-02] closed

解决方法

[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
设置每个进程最大同时打开文件数
切换到root用户，编辑limits.conf添加如下内容
vi /etc/security/limits.conf
* soft nofile 65536
* hard nofile 65536

[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
修改/etc/sysctl.conf文件，增加配置vm.max_map_count=262144
vi /etc/sysctl.conf
sysctl -p
执行命令sysctl -p生效

再启动就可以了

//后台启动
./elasticsearch -d

//查看当前节点信息
curl http://10.167.20.47:9200
{
  "name" : "node-01",
  "cluster_name" : "es-cluster",
  "cluster_uuid" : "e1E10qacTl-3keq91oAI_Q",
  "version" : {
    "number" : "6.8.0",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "65b6179",
    "build_date" : "2019-05-15T20:06:13.172855Z",
    "build_snapshot" : false,
    "lucene_version" : "7.7.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

//查看集群信息
curl http://10.167.20.47:9200/_cluster/health
{"cluster_name":"es-cluster","status":"green","timed_out":false,"number_of_nodes":5,"number_of_data_nodes":5,"active_primary_shards":0,"active_shards":0,"relocating_shards":0,"initializing_shards":0,"unassigned_shards":0,"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":100.0}