2. [2018-01-17T18:32:11,356][WARN ][o.e.b.JNANatives         ] unable to install syscall filter:
    3. java.lang.UnsupportedOperationException: seccomp unavailable: requires kernel 3.5+ with CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER compiled in
    4.        at org.elasticsearch.bootstrap.SystemCallFilter.linuxImpl(SystemCallFilter.java:328) ~[elasticsearch-6.1.2.jar:6.1.2]
    5.        at org.elasticsearch.bootstrap.SystemCallFilter.init(SystemCallFilter.java:616) ~[elasticsearch-6.1.2.jar:6.1.2]
    6.        at org.elasticsearch.bootstrap.JNANatives.tryInstallSystemCallFilter(JNANatives.java:258) [elasticsearch-6.1.2.jar:6.1.2]
    7.        at org.elasticsearch.bootstrap.Natives.tryInstallSystemCallFilter(Natives.java:113) [elasticsearch-6.1.2.jar:6.1.2]
    8.        at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:109) [elasticsearch-6.1.2.jar:6.1.2]
    9.        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:171) [elasticsearch-6.1.2.jar:6.1.2]
    10.        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:322) [elasticsearch-6.1.2.jar:6.1.2]
    11.        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) [elasticsearch-6.1.2.jar:6.1.2]
    12.        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) [elasticsearch-6.1.2.jar:6.1.2]
    13.        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) [elasticsearch-6.1.2.jar:6.1.2]
    14.        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) [elasticsearch-cli-6.1.2.jar:6.1.2]
    15.        at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-cli-6.1.2.jar:6.1.2]
    16.        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) [elasticsearch-6.1.2.jar:6.1.2]
    17.        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) [elasticsearch-6.1.2.jar:6.1.2]
    18. [2018-01-17T18:32:14,063][INFO ][o.e.n.Node               ] [cms-node1] initializing ...
    21. 原因：报了一大串错误，大家不必惊慌，其实只是一个警告，主要是因为你Linux版本过低造成的。
    22. 解决方案：
    23. 1、重新安装新版本的Linux系统
    24. 2、警告不影响使用，可以忽略