Elasticsearch 7.9.2启动报错及解决方案

桃扇骨 2022-11-21 11:48 217阅读 0赞

# 1、can not run elasticsearch as root #

**elasticsearch不允许以root用户启动需要使用其他用户才行**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY2hhb3lhbmc_size_16_color_FFFFFF_t_70][]

root用户无法启动官方说明：

> [https://www.elastic.co/guide/en/elasticsearch/reference/7.9/modules-scripting-security.html\#\_do\_not\_run\_as\_root][https_www.elastic.co_guide_en_elasticsearch_reference_7.9_modules-scripting-security.html_do_not_run_as_root]

**配置elasticsearch启动用户**

Elasticsearch为了安全考虑不允许使用root用户启动Elasticsearch，所以我们需要新建一个普通用户启动程序。新建的用户名和密码都是elastic。

[root@localhost elasticsearch-7.9.2]# adduser elastic
    [root@localhost elasticsearch-7.9.2]# passwd elastic
    更改用户 elastic 的密码 。
    新的 密码：
    无效的密码： 密码少于 8 个字符
    重新输入新的 密码：
    passwd：所有的身份验证令牌已经成功更新。

使用passwd elastic 命令给elastic用户设置密码（需要输入两遍密码）时，如果密码过于简单会有提示，用 root 用户操作可忽略提示，继续输入第二遍密码强制设置密码。

将elasticsearch目录权限赋予elastic用户，并用elastic用户启动elasticsearch，启动参数后面-d表示后台启动。

[root@localhost elasticsearch-7.9.2]# chown -R elastic /usr/local/elasticsearch-7.9.2/
    [root@localhost elasticsearch-7.9.2]# su elastic
    [elastic@localhost elasticsearch-7.9.2]$ ./bin/elasticsearch -d

#  2、max file descriptors \[4096\] for elasticsearch process is too low, increase to at least \[65535\] #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY2hhb3lhbmc_size_16_color_FFFFFF_t_70 1][]

1、修改limits.conf文件

[root@localhost elasticsearch-7.9.2]# vim /etc/security/limits.conf

2、在limits.conf文件末尾添加

* soft nofile 65536
    * hard nofile 131072
    * soft nproc 2048
    * hard nproc 4096

**修改配置后，断开连接，否则配置无效**

# 3、max virtual memory areas vm.max\_map\_count \[65530\] is too low, increase to at least \[262144\]   ![20201101204733577.png][] #

1、修改sysctl.conf文件

[root@localhost elasticsearch-7.9.2]# vim /etc/sysctl.conf

2、在sysctl.conf文件后面添加

vm.max_map_count=655360

3、刷新配置文件使之生效

[root@localhost elasticsearch-7.9.2]# sysctl -p
    vm.max_map_count = 655360

系统参数官方文档地址：

> [https://www.elastic.co/guide/en/elasticsearch/reference/current/system-config.html][https_www.elastic.co_guide_en_elasticsearch_reference_current_system-config.html]

![20201101205214293.png][]

# 4、the default discovery settings are unsuitable for production use; at least one of #

修改elasticsearch配置文件

[elastic@localhost elasticsearch-7.9.2]$ vi /usr/local/elasticsearch-7.9.2/config/elasticsearch.yml

修改node.name和 cluster.initial\_master\_nodes

node.name: node-1
    cluster.initial_master_nodes: ["node-1"]

# 5、连接不上虚拟机里面的elasticsearch #

修改elasticsearch配置文件

[elastic@localhost elasticsearch-7.9.2]$ vi /usr/local/elasticsearch-7.9.2/config/elasticsearch.yml

将elasticsearch.yml 文件中network.host修改成如下配置

network.host: 0.0.0.0 # 绑定到0.0.0.0，允许任何ip来访问

关闭防火墙

systemctl stop firewalld.service

# 6、elasticsearch-head连接不上elasticsearch #

确保上面第5步已经执行完成

修改elasticsearch配置文件

[elastic@localhost elasticsearch-7.9.2]$ vi /usr/local/elasticsearch-7.9.2/config/elasticsearch.yml

在elasticsearch.yml 文件末尾增加以下内容

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

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY2hhb3lhbmc_size_16_color_FFFFFF_t_70]: /images/20221120/205158cf4e484ee9bbc4ee50279eae71.png
[https_www.elastic.co_guide_en_elasticsearch_reference_7.9_modules-scripting-security.html_do_not_run_as_root]: https://www.elastic.co/guide/en/elasticsearch/reference/7.9/modules-scripting-security.html#_do_not_run_as_root
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY2hhb3lhbmc_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/2020110120413254.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY2hhb3lhbmc=,size_16,color_FFFFFF,t_70
[20201101204733577.png]: https://img-blog.csdnimg.cn/20201101204733577.png
[https_www.elastic.co_guide_en_elasticsearch_reference_current_system-config.html]: https://www.elastic.co/guide/en/elasticsearch/reference/current/system-config.html
[20201101205214293.png]: https://img-blog.csdnimg.cn/20201101205214293.png