A, requirements,
Recently I have been looking at ES related knowledge. Here I will briefly record the setup steps of ES cluster. Because the local machine is limited, here we simulate a cluster of three nodes on the same machine.
2. Preconditions
1. ES cannot be started with root, so you need to create a user.
2. The same data and log directories cannot be used between local ES nodes.
3. Split brain between clusters is maintained by the clusters themselves.
Third, the construction steps
1. Download ES
# download wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.12.0-linux-x86_64.tar.gz # extract tar ZXVF. - C) make a copy of cp-r es01/ es02 cp-r es01/ es03
2, create,esThe user also authorizes the ES directory
Chown-r es es01 chown-r es es02 chown-r es es02 chown-r es es02 chown-r es es02 chown-r es es02 chown-r es es02 Mkdir data &&mkdir log CD data mkdir es01 mkdir es02 mkdir es03 CD log mkdir es01 mkdir es03 es02 mkdir es03⚠️ Since starting ES with root will report an error, you need to create a new user here and then start ES with the new user.
3. Modify the ES configuration file
| The configuration file | attribute | Node 01 | Node. | Node 03 | explain |
|---|---|---|---|---|---|
| Es0 [1, 2, 3] / config / < br / > elasticsearch. Yml | es01 | es02 | es03 | ES01, ES02, ES03 represent three directories on the same machine | |
cluster.name |
es-cluster | es-cluster | es-cluster | The name of the cluster. The names of the clusters that make up the cluster must be consistent. | |
node.name |
es01 | es01 | es01 | Node name. The name of each node in the cluster must be unique. | |
path.data |
/home/es/<br/>es/data/es01 | /home/es/<br/>es/data/es02 | /home/es/<br/>es/data/es03 | The data directory | |
path.logs |
/home/es/<br/>es/log/es01 | /home/es/<br/>es/log/es02 | /home/es/<br/>es/log/es03 | Log directory | |
network.host |
localhost | localhost | localhost | Listening address, can write local IP address, through which can access ES | |
http.port |
9200 | 9201 | 9202 | Listen on port | |
transport.port |
9205 | 9206 | 9207 | Communication interfaces between clusters, such as cluster elections | |
discovery.<br/>seed_hosts: |
[“localhost:9095”, “localhost:9096”, “localhost:9097”] | [“localhost:9095”, “localhost:9096”, “localhost:9097”] | [“localhost:9095”, “localhost:9096”, “localhost:9097”] | The list of addresses that qualify as the primary node | |
cluster.<br/>initial_master_nodes |
[“es01”, “es02”, “es03”] | [“es01”, “es02”, “es03”] | [“es01”, “es02”, “es03”] | Initial list of candidate master nodes. Must be the same value as Node. name. | |
node.master |
true | true | true | true: Indicates that it can be elected as a master node. | |
node.data |
true | true | true | true:Indicates that data can be stored. | |
http.cors.enabled |
true | true | true | true:Indicates that cross domains are allowed. | |
http.cors.allow-origin |
* | * | * | Represents support for all domains | |
| Es0 [1, 2, 3] / config /. < br / > JVM options | |||||
| -Xms512m | -Xms512m | -Xms512m | Depending on your circumstances, do not exceed half of the native physical memory, and do not exceed a maximum of 30GB | ||
| -Xmx512m | -Xmx512m | -Xmx512m | . |
Important attributes:
-
cluster.initial_master_nodes
Link: https://www.elastic.co/guide/en/elasticsearch/reference/7.12/modules-discovery-bootstrap-cluster.html
Link: https://www.elastic.co/guide/en/elasticsearch/reference/7.12/important-settings.html#initial_master_nodes
4, A complete configuration for elasticsearch.yml under the ES01 directory
cluster.name: es-cluster
node.name: es01
path.data: /home/es/es/data/es01
path.logs: /home/es/es/log/es01
network.host: localhost
http.port: 9200
transport.port: 9205
discovery.seed_hosts: ["localhost:9205", "localhost:9206", "localhost:9207"]
cluster.initial_master_nodes: ["es01", "es02", "es03"]
node.master: true
node.data: true
http.cors.enabled: true
http.cors.allow-origin: "*"5. Start the ES cluster
#! / bin/bash # - d background start - p specified pid stored in the file/home/es/es/es01 / pid01 / home/es/es/es01 / bin/elasticsearch - d - p pid01 /home/es/es/es02/bin/elasticsearch -d -p pid02 /home/es/es/es03/bin/elasticsearch -d -p pid036. Check if the cluster is started
curl http://localhost:9202/_cat/nodes? v
curl http://localhost:9202/_cat/health? v
Four, reference links
1, https://www.elastic.co/cn/downloads/elasticsearch.
2, https://www.elastic.co/guide/en/elasticsearch/reference/current/important-settings.html#discovery-settings
3, https://www.elastic.co/guide/en/elasticsearch/reference/7.12/modules-discovery-bootstrap-cluster.html.
4, https://www.elastic.co/guide/en/elasticsearch/reference/7.12/important-settings.html#initial_master_nodes
5, https://www.elastic.co/guide/en/elasticsearch/reference/7.12/modules-discovery-settings.html
6, https://www.elastic.co/guide/en/elasticsearch/reference/7.12/jvm-options.html