ERROR: [1] bootstrap checks failed
[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
解决：
在宿主机执行：
sysctl -w vm.max_map_count=262144
原因：
vm.max_map_count参数，是允许一个进程在VMAs拥有最大数量（VMA：虚拟内存地址， 一个连续的虚拟地址空间），当进程占用内存超过时， 直接OOM。
elasticsearch占用内存较高。官方要求max_map_count需要配置到最小262144。
问题
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c5330000, 986513408, 0) failed; error='Cannot allocate memory' (errno=12) # # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (mmap) failed to map 986513408 bytes for committing reserved memory. # An error report file with more information is saved as: # /usr/local/software/temp/elasticsearch-6.2.2/hs_err_pid1912.log
解决：
内存不够，购买阿里云的机器可以动态增加内存，或者启动时候现在内存为256M
问题:
[root@iZwz95j86y235aroi85ht0Z bin]# ./elasticsearch [2018-02-22T20:14:04,870][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:125) ~[elasticsearch-6.2.2.jar:6.2.2] at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-6.2.2.jar:6.2.2] at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.2.2.jar:6.2.2] at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.2.2.jar:6.2.2]
解决：
用非root用户
添加用户：useradd -m 用户名 然后设置密码 passwd 用户名
问题:
./elasticsearch
Exception in thread "main" java.nio.file.AccessDeniedException: /usr/local/software/temp/elasticsearch-6.2.2/config/jvm.options
解决：
权限不够 chmod 777 -R 当前es目录
max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
解决方案
[root@centos7 sonarqube-7.2.1]# vi /etc/security/limits.conf pangkunkun1 hard nofile 65536 pangkunkun1 soft nofile 65536
这里的pangkunkun1为上面创建的用来启动sonar的用户，修改好之后要切换到pangkunkun1这个用户之后才能生效。
使用ulimit -Hn指令查看配置是否生效：
[pangkunkun1@centos7 sonarqube-7.2.1]$ ulimit -Hn
65536