Elasticsearch启动报错解决方法
    1、机器内剩余内存较少,会启动失败,并且有类似如下报错:
    Java HotSpot(TM) 64-Bit Server VM warning:INFO: os::commit_memory(0x000000008a660000, 1973026816, 0) failed; error=’Cannot allocate memory’ (errno=12)
    这是因为es的jvm参数-Xmx和-Xms默认都为2G
    修改config下的jvm.option文件
    # vi elasticsearch/elasticsearch-6.1.0/config/jvm.opstions

    -Xms2g
    -Xmx2g
    改为
    -Xms1g
    -Xmx1g
    或更小
    -Xms512M
    -Xmx512M
    再次启动即可
    2、启动的时候出现:
    1、ERROR: bootstrap checks failed system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk…
    解决方法:在elasticsearch.yml中配置bootstrap.system_call_filter为false,注意要在Memory下面:
    bootstrap.memory_lock: false
    bootstrap.system_call_filter: false
    3、ERROR: bootstrap checks failed max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536] max number of threads [1024] for user [lishang] likely too low, increase to at least [2048]
    解决方法:切换到root用户,编辑limits.conf 添加类似如下内容
    #vi /etc/security/limits.conf
    添加如下内容:
    soft nofile 65536
    hard nofile 131072
    soft nproc 2048
    hard nproc 4096

    4、max number of threads [1024] for user [lish] likely too low, increase to at least [2048]
    解决方法:切换到root用户,进入limits.d目录下修改配置文件。
    #vi /etc/security/limits.d/90-nproc.conf
    修改如下内容:
    soft nproc 1024
    修改为
    soft nproc 2048
    5、max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]
    解决方法:切换到root用户修改配置sysctl.conf
    #vi /etc/sysctl.conf
    添加下面配置:
    vm.max_map_count=655360
    并执行命令:
    #sysctl -p
    然后,再启动elasticsearch,即可启动成功。

    报错[seci-*] creating index,cause[api],templates[],shards[5]/[1],mappings[]
    [seci-*/**]create_create_mapping
    解决方法:
    #vi /etc/security/limits.conf
    soft nofile 65536
    hard nofile 131072
    这个文件的最后两行,把上面这个配置覆盖了。删掉最后两行即可
    正确文件:ElasticSearch 7.X系列之:Centos7中常见启动报错以及解决方法 - 图1image.gif