解决es启动no java的问题

在服务器搭建es时，启动es，发现一直失败
1.查看es服务状态：

systemctl status elasticsearch

是有报错

[root@localhost ~]# systemctl status elasticsearch
● elasticsearch.service - elasticsearch
   Loaded: loaded (/etc/systemd/system/elasticsearch.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Mon 2019-02-11 09:11:34 CST; 3min 49s ago
  Process: 16665 ExecStart=/home/es/elasticsearch/bin/elasticsearch (code=exited, status=1/FAILURE)
 Main PID: 16665 (code=exited, status=1/FAILURE)

Feb 11 09:11:34 cargo systemd[1]: Started elasticsearch.
Feb 11 09:11:34 cargo systemd[1]: Starting elasticsearch...
Feb 11 09:11:34 cargo elasticsearch[16665]: which: no java in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
Feb 11 09:11:34 cargo systemd[1]: elasticsearch.service: main process exited, code=exited, status=1/FAILURE
Feb 11 09:11:34 cargo systemd[1]: Unit elasticsearch.service entered failed state.
Feb 11 09:11:34 cargo systemd[1]: elasticsearch.service failed.

2.查看java安装位置
which java

3.建立软连接

ln -s /usr/share/java/jdk1.8.0_181/bin/java /usr/bin/java

4.启动es，并访问