Elasticsearch5.6.8 安装问题集锦

今天在内部linux环境安装elasticsearch5.6.8时遇到一些问题,主要如下

使用elasticsearch5.6.8 必须安装jdk1.8

[elsearch@vm-mysteel-dc-search01 bin]$ java -version
java version "1.8.0_112"
java(tm) se runtime environment (build 1.8.0_112-b15)
java hotspot(tm) 64-bit server vm (build 25.112-b15, mixed mode)
[elsearch@vm-mysteel-dc-search01 bin]$ 

使用root账号启动es后 会遇到以下问题

[2016-11-14t10:05:29,358][warn ][o.e.b.elasticsearchuncaughtexceptionhandler] [] uncaught exception in thread

[main]

org.elasticsearch.bootstrap.startupexception: java.lang.runtimeexception: can not run elasticsearch as root

at org.elasticsearch.bootstrap.elasticsearch.init(elasticsearch.java:116) ~[elasticsearch-

5.0.0.jar:5.0.0]

at org.elasticsearch.bootstrap.elasticsearch.execute(elasticsearch.java:103) ~[elasticsearch-

5.0.0.jar:5.0.0]

at org.elasticsearch.cli.settingcommand.execute(settingcommand.java:54) ~[elasticsearch-

5.0.0.jar:5.0.0]

at org.elasticsearch.cli.command.mainwithouterrorhandling(command.java:96) ~[elasticsearch-

5.0.0.jar:5.0.0]

at org.elasticsearch.cli.command.main(command.java:62) ~[elasticsearch-5.0.0.jar:5.0.0]

at org.elasticsearch.bootstrap.elasticsearch.main(elasticsearch.java:80) ~[elasticsearch-

5.0.0.jar:5.0.0]

at org.elasticsearch.bootstrap.elasticsearch.main(elasticsearch.java:73) ~[elasticsearch-

5.0.0.jar:5.0.0]

解决方案：

因为安全问题elasticsearch 不让用root用户直接运行，所以要创建新用户

• 建议创建一个单独的用户用来运行elasticsearch

• 创建elsearch用户组及elsearch用户

groupadd elsearch
useradd elsearch -g elsearch -p elasticsearch

使用elsearch启动es后 又会遇到以下问题

error: bootstrap checks failed
max file descriptors [10240] for elasticsearch process likely too low, increase to at least [65536]
max number of threads [1024] for user [elsearch] likely too low, increase to at least [2048]
max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]
[2016-11-14t10:22:17,569][info ][o.e.n.node               ] [mysteel-node1] stopping ...
[2016-11-14t10:22:17,615][info ][o.e.n.node               ] [mysteel-node1] stopped
[2016-11-14t10:22:17,615][info ][o.e.n.node               ] [mysteel-node1] closing ...
[2016-11-14t10:22:17,638][info ][o.e.n.node               ] [mysteel-node1] closed

解决方法参考 ：

切换到root用户

vi /etc/security/limits.conf

添加如下内容:

* soft nofile 65536

* hard nofile 131072

* soft nproc 2048

* hard nproc 4096

vi /etc/security/limits.d/90-nproc.conf

修改如下内容：

* soft nproc 1024

#修改为

* soft nproc 2048

 

vi /etc/sysctl.conf 

添加下面配置：

vm.max_map_count=655360

并执行命令：

sysctl -p

然后，重新启动elasticsearch，即可启动成功。