ELK学习003:Elasticsearch启动常见问题
一、Caused by: java.lang.RuntimeException: can not run elasticsearch as root
这个错误,是因为使用root用户启动elasticsearch,elasticsearch是不允许使用root用户启动的,所以我们需要添加用户。
[root@localhost ~]# adduser elsearch[root@localhost ~]# passwd elsearch
[root@localhost ~]# chown -R elsearch:elsearch elasticsearch-7.6.0
[root@localhost ~]# chmod 770 elasticsearch-7.6.0/ # 这一步之后,切换到elsearch用户,再执行下面两条命令。
[root@localhost ~]# cd elasticsearch-7.6.0/
[root@localhost ~]# bin/elasticsearch
二、OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000e5330000, 449642496, 0) failed; error="Not enough space" (errno=12); 或者error="Cannot a ..."(errno=12);
原因:jvm要分配最大内存超出系统内存
解决:
root@localhost ~]# vim /elasticsearch-7.6.0/config/jvm.options # 适当调整指定jvm内存,由于虚拟机内存制定1g,所以适当降低jvm内存指定,这里改成512m。-Xms512m
-Xmx512m
[root@localhost ~]# /elasticsearch-7.6.0/bin/elasticsearch # 重启elasticsearch
三、org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: failed to obtain node locks, tried [[/www/wwwroot/elasticsearch-7.6.0/data]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [1])?
原因:线程占用
解决:重新启动
[root@localhost ~]# ps -ef | grep elasticsearch # 找到elasticsearch线程[root@localhost ~]# kill -9 pid # 杀死elasticsearch线程
[root@localhost ~]# /elasticsearch-7.6.0/bin/elasticsearch # 重启elasticsearch
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