一 ElasticSearch需要安装在普通用户下,安装在root用户下会报如下错误
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
1.创建普通用户并设置密码
adduser normaluser
passwd normaluser如下密码设置成功
2.进入normaluser用户中
代码语言：javascript复制su normaluser3.进入elasticsearch下载页面,进行对应平台下载es,271M,网速慢的需要耐心等待
代码语言：javascript复制wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.3.0-linux-x86_64.tar.gz
4.解压安装包
代码语言：javascript复制tar -zxvf elasticsearch-7.3.0-linux-x86_64.tar.gz5.进入到bin目录下
代码语言：javascript复制cd elasticsearch-7.3.0/bin/6.启动
代码语言：javascript复制./elasticsearch出现以下报错信息
error: OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release. OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c5330000, 986513408, 0) failed; error='Not enough space' (errno=12)
报错原因:说明内存空间不够,需要将占用内存空间改小一点
代码语言：javascript复制vi ../config/jvm.options原先1G改为现在的400M即可
重新启动,启动成功
7.验证是否启动成功
代码语言：javascript复制curl 127.0.0.1:9200出现以下,代表启动成功
8.守护进程启动
代码语言：javascript复制./elasticsearch -d二 设置elasticsearch可以外网访问
1.elasticsearch默认端口9200,需要开启服务器端口可以外网访问
2. 修改配置文件,将ip改为0.0.0.0,如果需要特定ip可以访问,可以设定为固定的ip
代码语言：javascript复制vi ../config/elasticsearch.yml
3.启动elasticsearch,发现无法启动会出现报错信息
报错信息
ERROR: [1] bootstrap checks failed [1]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured
原因没有发现host 需要至少保留一个,取消注释,保留host1
代码语言：javascript复制vi ../config/elasticsearch.yml
4.重新启动后在vindows本地通过外网ip:9200打开是否可以访问
如下启动成功
三 ElasticSearch设置外网启动的其他错误信息汇总
1.system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk
原因 因为Centos6不支持SecComp，而ES5.2.1默认bootstrap.system_call_filter为true进行检测，所以导致检测失败，失败后直接导致ES不能启动
解决方案:
代码语言：javascript复制vi ../config/elasticsearch.yml在Memory下添加一下内容
代码语言：javascript复制bootstrap.memory_lock: false
bootstrap.system_call_filter: false
2.max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
原因:虚拟内存不够
解决方案,从65530增加到655360
退出普通用户,切换到root用户,打开配置文件进行修改
代码语言：javascript复制vim /etc/sysctl.conf
3.
问题1:max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]
问题2:max number of threads [1024] for user [lishang] likely too low, increase to at least [2048]
在root用户下修改配置文件
vim /etc/security/limits.conf在文件末尾进行文件配置
4.max number of threads [1024] for user [lish] likely too low, increase to at least [2048]
修改配置文件
vim /etc/security/limits.d/20-nproc.conf
