elasticsearch安装

安装jdk环境，自行百度

安装elasticsearch

下载 https://www.elastic.co/cn/downloads/elasticsearch

我目前使用的版本，包含分词插件

链接: https://pan.baidu.com/s/1gJX20Gy3TbgCNvxNl8jbLA 提取码: 36cd 

将下载的 tar.gz包放到linux的opt目录下

解压

tar -zxvf elasticsearch-****.tar.gz 

因为elasticsearch不能使用root运行

创建user用户

adduser user

将目录的权限给user

chown -R user:user /opt/elasticsearch-7.4.2

创建存数据和日志的目录，我放在home下面

mkdir /home/elasticsearch

将目录所有者改为user

chown -R user:user /home/elasticsearch

切换到user用户

su user

创建数据目录和日志目录

mkdir //home/elasticsearch/datanode/data

mkdir //home/elasticsearch/datanode/logs

修改配置文件

cd /opt/elasticsearch-7.4.2/config

vi elasticsearch.yml

配置修改成如下

# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#
cluster.name: abner  //打开设定es群集名称
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
node.name: node-1      //es当前节点名称，用于区分不同节点
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#
path.data: /home/elasticsearch/datanode/data    //修改数据目录，此目录为自定义，需要在root用户下创建，且属主属组更改为ela
#
# Path to log files:
#
path.logs: /home/elasticsearch/datanode/logs  //日志目录位置，需自己创建，方式同上
                                  //yum安装则系统自定义，在软件版本或者系统升级时会被删除，所以建议修改
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
bootstrap.memory_lock: true  //elasticsearch官网建议生产环境需要设置bootstrap.memory_lock: true
#
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 0.0.0.0  //监听访问地址为任意网段
#
# Set a custom port for HTTP:
#
http.port: 9200  //服务监听端口
#

准备工作完成，启动

cd /opt/elasticsearch-7.4.2/bin
./elasticsearch    后面可以跟上-d后台执行

如果报错

1错，当发现ERROR: [1] bootstrap checks failed错误时

vim /etc/sysctl.conf

vm.max_map_count = 655360 //添加

执行命令使配置生效

sysctl -p 

2错，max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]

修改/etc/security/limits.conf文件，增加配置，用户退出后重新登录生效

*  soft    nofile          65536
*  hard    nofile          65536

3错，ERROR: bootstrap checks failed memory locking requested for elasticsearch process but memory is not locked

root权限编辑

 vi /etc/security/limits.conf

* soft memlock unlimited

* hard memlock unlimited

vi /etc/sysctl.conf

vm.swappiness=0

配置生效 

sysctl -p

重新登录或重启服务器方可生效

4错，availableProcessors is already set to [4], rejecting [4]

在main加上

System.setProperty("es.set.netty.runtime.available.processors", "false");

 查看是否运行成功

netstat -ntap | grep 9200

开放 9200端口

firewall-cmd --zone=public --add-port=9200-9400/tcp --permanent

firewall-cmd --reload