Elasticsearch单机部署

# 1、下载软件包
```
cd /opt
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.17.6-linux-x86_64.tar.gz
tar -xzf elasticsearch-7.17.6-linux-x86_64.tar.gz
mv elasticsearch-7.17.6 elasticsearch
cd elasticsearch/ 
```
# 2、配置环境变量
```
vim /etc/profile

export ES_HOME=/opt/elasticsearch
export PATH=$ES_HOME/bin:$PATH

source /etc/profile
```
# 3、修改Elasticsearch核心配置文件
```
vim /opt/elasticsearch/config/elasticsearch.yml

cluster.name: elasticsearch01
node.name: tx-node
path.data: /opt/elasticsearch/data
path.logs: /opt/elasticsearch/logs
network.host: 0.0.0.0
discovery.seed_hosts: ["127.0.0.1"]
cluster.initial_master_nodes: ["tx-node"]
```
# 4、创建ES数据存储文件夹
```
cd /opt/elasticsearch/
mkdir data
```
# 5、修改 jvm.options 配置
```
vim /opt/elasticsearch/config/jvm.options

# 建议配置为物理内存的一半或者更多最好不要超过32G，超过了也可能不会增强性能
-Xms2g
-Xmx2g
```
# 6、创建 esuser 用户并授权
```
# useradd esuser
# chown -R esuser:esuser /opt/elasticsearch
```
# 7、切换到esuser用户，启动Elasticsearch
```
# su esuser

# cd /usr/local/elasticsearch-7.14.1/bin

# ./elasticsearch
```
# 9、问题处理
## 9.1 最大虚拟内存太低
```
[2022-10-18T14:13:56,218][ERROR][o.e.b.Bootstrap          ] [tx-node] node validation exception
[1] bootstrap checks failed. You must address the points described in the following [1] lines before starting Elasticsearch.
bootstrap check failure [1] of [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
```
- 处理方法：
```
echo "vm.max_map_count=262144" >> /etc/sysctl.conf
sysctl -p
```