Es 集群搭建及相关配置

参考文档:

https://www.elastic.co/guide/en/elasticsearch/reference/8.3/index.html

https://www.elastic.co/guide/en/elasticsearch/reference/8.3/important-settings.html

https://www.elastic.co/guide/en/elasticsearch/reference/8.3/advanced-configuration.html#set-jvm-options

本文主要介绍elasticsearch-8.3.2 集群安装 -简易版

1、JVM相关配置

参考:https://www.elastic.co/guide/en/elasticsearch/reference/8.3/advanced-configuration.html#set-jvm-options

(1)、配置JVM内存

官方建议:Set Xms and Xmx to no more than 50% of your total memory. Elasticsearch requires memory for purposes other than the JVM heap. For example, Elasticsearch uses off-heap buffers for efficient network communication and relies on the operating system’s filesystem cache for efficient access to files. The JVM itself also requires some memory. It’s normal for Elasticsearch to use more memory than the limit configured with the Xmx setting.

修改jvm.options文件在config目录下,调整以下参数:

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-Xms2g
-Xmx2g

这里设为2g得原因是,本地内存不太够.

2、集群配置

(1)、集群名称

官方介绍:A node can only join a cluster when it shares its cluster.name with all the other nodes in the cluster. The default name is elasticsearch, but you should change it to an appropriate name that describes the purpose of the cluster.

修改elasticsearch.yml文件在config目录下,调整以下参数:

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cluster.name: test_cluster

3、集群节点配置

(1)、节点名称

官方介绍:

Elasticsearch uses node.name as a human-readable identifier for a particular instance of Elasticsearch. This name is included in the response of many APIs. The node name defaults to the hostname of the machine when Elasticsearch starts, but can be configured explicitly in elasticsearch.yml:

修改elasticsearch.yml文件在config目录下,调整以下参数:

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node.name: node-1

4、集群网络配置

(1)、network.host 设置

官方介绍:

(Static) Sets the address of this node for both HTTP and transport traffic. The node will bind to this address and will also use it as its publish address. Accepts an IP address, a hostname, or a special value.

注意以下官方说明:

By default, Elasticsearch only binds to loopback addresses such as 127.0.0.1 and [::1]. This is sufficient to run a cluster of one or more nodes on a single server for development and testing, but a resilient production cluster must involve nodes on other servers. There are many network settings but usually all you need to configure is network.host:

When you provide a value for network.host, Elasticsearch assumes that you are moving from development mode to production mode, and upgrades a number of system startup checks from warnings to exceptions. See the differences between development and production modes.

修改elasticsearch.yml文件在config目录下,调整以下参数:

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network.host: 0.0.0.0

(4)、http.port设置

官方介绍:

(Static) The port to bind for HTTP client communication. Accepts a single value or a range. If a range is specified, the node will bind to the first available port in the range.

Defaults to 9200-9300.

修改elasticsearch.yml文件在config目录下,增加以下参数:

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http.port: 9200

注:不设置,默认是9200

(5)、transport.port设置

官方介绍：

(Static) The port to bind for communication between nodes. Accepts a single value or a range. If a range is specified, the node will bind to the first available port in the range. Set this setting to a single port, not a range, on every master-eligible node.

Defaults to 9300-9400.

修改elasticsearch.yml文件在config目录下,调整以下参数:

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transport.port: 9300

5、集群发现相关配置

官方介绍：Configure two important discovery and cluster formation settings before going to production so that nodes in the cluster can discover each other and elect a master node.

(1)、discovery.seed_hosts

官方介绍：

Out of the box, without any network configuration, Elasticsearch will bind to the available loopback addresses and scan local ports 9300 to 9305 to connect with other nodes running on the same server. This behavior provides an auto-clustering experience without having to do any configuration.

When you want to form a cluster with nodes on other hosts, use the static discovery.seed_hosts setting. This setting provides a list of other nodes in the cluster that are master-eligible and likely to be live and contactable to seed the discovery process. This setting accepts a YAML sequence or array of the addresses of all the master-eligible nodes in the cluster. Each address can be either an IP address or a hostname that resolves to one or more IP addresses via DNS.

修改elasticsearch.yml文件在config目录下,调整以下参数:

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discovery.seed_hosts: ["127.0.0.1:9300", "172.18.100.231:9300"]

(2)、cluster.initial_master_nodes

官方介绍:

When you start an Elasticsearch cluster for the first time, a cluster bootstrapping step determines the set of master-eligible nodes whose votes are counted in the first election. In development mode, with no discovery settings configured, this step is performed automatically by the nodes themselves.

Because auto-bootstrapping is inherently unsafe, when starting a new cluster in production mode, you must explicitly list the master-eligible nodes whose votes should be counted in the very first election. You set this list using the cluster.initial_master_nodes setting.

注意:After the cluster forms successfully for the first time, remove the cluster.initial_master_nodes setting from each node’s configuration. Do not use this setting when restarting a cluster or adding a new node to an existing cluster

修改elasticsearch.yml文件在config目录下,调整以下参数:

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cluster.initial_master_nodes: ["node-1", "node-2"]

6、安全相关

(1)、xpack.security.enabled 是否关闭安全模式(开发环境),8.x及之后得版本默认都是开启.

修改elasticsearch.yml文件在config目录下,增加以下参数:

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xpack.security.enabled: false

(2)、跨域相关如果用了Head插件

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http.cors.enabled: true
http.cors.allow-origin: "*"

这里如果启用跨域相关配置,必须配置下(1),否则会报错,具体原因不清楚.自行百度

7、注意

集群配置时如果遇到失败的情况,每次运行完elasticsearch.bat,必须清楚根目录下得data文件,反之,集群可能会构建失败

8、源码

(1)、JVM相关配置上面有介绍,根据机器配置酌情选择

(2)、node1节点 elasticsearch.yml文件如下

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cluster.name: test_cluster
node.name: node-2
network.host: 0.0.0.0
http.port: 9200
transport.port: 9300
http.cors.enabled: true
http.cors.allow-origin: "*"
discovery.seed_hosts: ["127.0.0.1:9300", "172.18.100.231:9300"]
cluster.initial_master_nodes: ["node-1", "node-2"]
xpack.security.enabled: false

(3)、node2节点 elasticsearch.yml文件如下

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cluster.name: test_cluster
node.name: node-1
network.host: 172.18.100.231
http.cors.enabled: true
http.cors.allow-origin: "*"
discovery.seed_hosts: ["172.18.100.231:9300","172.18.10.214:9300"]
xpack.security.enabled: false