elasticsearch之JAVA环境变量报错：could not find java; set JAVA_HOME or ensure java is in PATH...

ゞ浴缸里的玫瑰 2022-01-06 12:07 517阅读 0赞

在以RPM包安装elasticsearch过程中出现报错JAVA环境的问题：

● elasticsearch.service - Elasticsearch
       Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: disabled)
       Active: failed (Result: exit-code) since Mon 2019-01-14 11:27:16 CST; 5s ago
         Docs: http://www.elastic.co
      Process: 2035 ExecStart=/usr/share/elasticsearch/bin/elasticsearch -p ${PID_DIR}/elasticsearch.pid --quiet (code=exited, status=1/FAILURE)
     Main PID: 2035 (code=exited, status=1/FAILURE)
    
    Jan 14 11:27:16 ip-172-31-30-62.ec2.internal systemd[1]: Started Elasticsearch.
    Jan 14 11:27:16 ip-172-31-30-62.ec2.internal systemd[1]: Starting Elasticsearch...
    Jan 14 11:27:16 ip-172-31-30-62.ec2.internal elasticsearch[2035]: which: no java in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin)
    Jan 14 11:27:16 ip-172-31-30-62.ec2.internal elasticsearch[2035]: could not find java; set JAVA_HOME or ensure java is in PATH
    Jan 14 11:27:16 ip-172-31-30-62.ec2.internal systemd[1]: elasticsearch.service: main process exited, code=exited, status=1/FAILURE
    Jan 14 11:27:16 ip-172-31-30-62.ec2.internal systemd[1]: Unit elasticsearch.service entered failed state.
    Jan 14 11:27:16 ip-172-31-30-62.ec2.internal systemd[1]: elasticsearch.service failed.

也就是说就算是你设置好JAVA全局环境变量后，elasticsearch启动的时候依然是在上面红色字体的PATH变量里面找java变量。这个不清楚究竟是什么原因。我们暂时把它当做是丢环境变量的原因吧。不过我们倒是有其他的解决方法：

在/etc/sysconfig/elasticsearch的这个文件里面设置JAVA\_HOME环境变量：

################################
    # Elasticsearch
    ################################
    
    # Elasticsearch home directory
    #ES_HOME=/usr/share/elasticsearch
    
    # Elasticsearch Java path
    JAVA_HOME=/usr/local/jdk
    
    # Elasticsearch configuration directory
    ES_PATH_CONF=/etc/elasticsearch
    
    # Elasticsearch PID directory
    #PID_DIR=/var/run/elasticsearch

就是上面背景为青色的字体，设置一下环境变量后就可以正常启动了。

有时候也是编译环境的问题，比如上面这个问题就是，JAVA的jdk是源码安装的，而elasticsearch是yum一键安装的，因此很容易出现问题，所以我建议两者的安装尽量一致，jdk也使用yum安装比较好，这个问题就不会出现了。

转载于:https://www.cnblogs.com/FengGeBlog/p/10266126.html