Centos7安装ElasticSearch

阿里云ECS
配置：1核1G内存
系统：Centos7

• Elasticsearch默认不推荐使用root用户启动，所以创建用户elastic

useradd   elastic

• 设置密码 （回车后输入密码）

passwd   elastic

• 切到elastic用户目录下

cd /home/elastic

• 下载Elasticsearch安装包

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.5.2.tar.gz

• 解压安装包

tar -xzvf elasticsearch-5.5.2.tar.gz

• 给elastic用户设置文件读写权限

chown -R elastic:elastic  elasticsearch-5.5.2

• 切换到elastic用户，并启动elasticsearch

su elastic
sh elasticsearch-5.5.2/bin/elasticsearch

启动过程中可能遇到的错误

---

• max number of threads [3895] for user [elk] is too low, increase to at least [4096]

查看服务器当前用户的最大线程数为3895，修改配置文件件/etc/security/limits.d/20-nproc.conf（Centos7）：

image.png

• max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]

# 切换到root用户，编辑limits.conf 
vi /etc/security/limits.conf

# 添加如下内容
* hard nofile 65536
* soft nofile 65536

• max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]

# 切换到root用户修改配置sysctl.conf
vi /etc/sysctl.conf

# 添加下面配置：
vm.max_map_count=655360

# 并执行命令：
sysctl -p

# 重启 Elasticsearch