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linux内核版本低于3.5，不支持seccomp；
[2018-03-12T11:56:52,328][WARN ][o.e.b.JNANatives ] unable to install syscall filter:
java.lang.UnsupportedOperationException: seccomp unavailable: requires kernel 3.5+ with CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER compiled in
at org.elasticsearch.bootstrap.SystemCallFilter.linuxImpl(SystemCallFilter.java:328) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.SystemCallFilter.init(SystemCallFilter.java:616) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.JNANatives.tryInstallSystemCallFilter(JNANatives.java:258) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Natives.tryInstallSystemCallFilter(Natives.java:113) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:110) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) [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]
at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-cli-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) [elasticsearch-6.2.2.jar:6.2.2]
解决办法：
修改elasticsearch.yaml文件，设置禁用seccomp；
bootstrap.system_call_filter: false
用户没有权限使用mlockall;
[2018-03-12T11:56:52,328][WARN ][o.e.b.JNANatives ] unable to install syscall filter:
java.lang.UnsupportedOperationException: seccomp unavailable: requires kernel 3.5+ with CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER compiled in
at org.elasticsearch.bootstrap.SystemCallFilter.linuxImpl(SystemCallFilter.java:328) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.SystemCallFilter.init(SystemCallFilter.java:616) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.JNANatives.tryInstallSystemCallFilter(JNANatives.java:258) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Natives.tryInstallSystemCallFilter(Natives.java:113) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:110) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) [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]
at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-cli-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) [elasticsearch-6.2.2.jar:6.2.2]
[2018-03-12T11:56:52,359][WARN ][o.e.b.JNANatives ] Unable to lock JVM Memory: error=12, reason=Cannot allocate memory
[2018-03-12T11:56:52,359][WARN ][o.e.b.JNANatives ] This can result in part of the JVM being swapped out.
[2018-03-12T11:56:52,359][WARN ][o.e.b.JNANatives ] Increase RLIMIT_MEMLOCK, soft limit: 65536, hard limit: 65536
[2018-03-12T11:56:52,359][WARN ][o.e.b.JNANatives ] These can be adjusted by modifying /etc/security/limits.conf, for example:
# allow user 'work' mlockall
work soft memlock unlimited
work hard memlock unlimited
[2018-03-12T11:56:52,359][WARN ][o.e.b.JNANatives ] If you are logged in interactively, you will have to re-login for the new limits to take effect.
解决办法：
使用root用户修改/etc/security/limits.conf文件：
work soft memlock unlimited work hard memlock unlimited
最大文件句柄数设置过低；
解决办法：
使用root用户修改/etc/security/limits.conf文件：
work soft nofile 65536 work hard nofile 65536
最大线程数设置过低；
解决办法：
使用root用户修改/etc/security/limits.conf文件：
work soft nproc 4096 work hard nproc 4096
vm.max_map_count设置过低
[2018-03-12T14:25:44,413][WARN ][o.e.b.BootstrapChecks ] [yf-beidou-dmp00.yf01.baidu.com] max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
解决办法：
1）执行如下命令，实时生效：
sysctl -w vm.max_map_count=262144
2）修改/etc/sysctl.conf，重启后生效：
vm.max_map_count = 262144
注：要使 limits.conf 文件配置生效，必须要确保 pam_limits.so 文件被加入到启动文件中。查看 /etc/pam.d/login 文件中有：session required /lib/security/pam_limits.so这一行配置；
安装x-pack重启后报错：Failed to create native process factories for Machine Learning
org.elasticsearch.ElasticsearchException: Failed to create native process factories for Machine Learning
at org.elasticsearch.xpack.ml.MachineLearning.createComponents(MachineLearning.java:422) ~[?:?]
at org.elasticsearch.xpack.ml.MachineLearning.createComponents(MachineLearning.java:373) ~[?:?]
at org.elasticsearch.node.Node.lambda$new$7(Node.java:397) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.node.Node$$Lambda$1374/1560391896.apply(Unknown Source) ~[?:?]
at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:267) ~[?:1.8.0_45]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374) ~[?:1.8.0_45]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512) ~[?:1.8.0_45]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502) ~[?:1.8.0_45]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[?:1.8.0_45]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_45]
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[?:1.8.0_45]
at org.elasticsearch.node.Node.<init>(Node.java:400) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.node.Node.<init>(Node.java:246) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:213) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:213) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) [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]
at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-cli-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) [elasticsearch-6.2.2.jar:6.2.2]
这是由于x-pack中的machine learning功能依赖于2.9以上版本GLIBC，环境中缺乏glibc库所致。可通过如下命令定位问题：
${ES_HOME}/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/controller --version
输出缺少依赖的日志如下：
./controller: /lib64/tls/libc.so.6: version `GLIBC_2.4' not found (required by ./controller) ./controller: /lib64/tls/libc.so.6: version `GLIBC_2.4' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/libMlCore.so) ./controller: /lib64/tls/libc.so.6: version `GLIBC_2.7' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/libMlCore.so) ./controller: /lib64/tls/libpthread.so.0: version `GLIBC_2.4' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libapr-1.so.0) ./controller: /lib64/tls/libc.so.6: version `GLIBC_2.9' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libapr-1.so.0) ./controller: /lib64/tls/libc.so.6: version `GLIBC_2.7' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libxml2.so.2)
或者通过ldd命令查看controller的依赖：
ldd ${ES_HOME}/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/controller
输出日志如下：
./controller: /lib64/tls/libc.so.6: version `GLIBC_2.4' not found (required by ./controller)
./controller: /lib64/tls/libc.so.6: version `GLIBC_2.4' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/libMlCore.so)
./controller: /lib64/tls/libc.so.6: version `GLIBC_2.7' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/libMlCore.so)
./controller: /lib64/tls/libpthread.so.0: version `GLIBC_2.4' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libapr-1.so.0)
./controller: /lib64/tls/libc.so.6: version `GLIBC_2.9' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libapr-1.so.0)
./controller: /lib64/tls/libc.so.6: version `GLIBC_2.7' not found (required by /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libxml2.so.2)
libpthread.so.0 => /lib64/tls/libpthread.so.0 (0x00007fb285c82000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fb285b7f000)
librt.so.1 => /lib64/tls/librt.so.1 (0x00007fb285a65000)
liblog4cxx.so.10 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/liblog4cxx.so.10 (0x00007fb28567e000)
libboost_program_options-gcc62-mt-1_65_1.so.1.65.1 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/libboost_program_options-gcc62-mt-1_65_1.so.1.65.1 (0x00007fb2853fd000)
libMlCore.so => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/libMlCore.so (0x00007fb2850d1000)
libstdc++.so.6 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/libstdc++.so.6 (0x00007fb284d27000)
libm.so.6 => /lib64/tls/libm.so.6 (0x00007fb284ba1000)
libgcc_s.so.1 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/libgcc_s.so.1 (0x00007fb28498a000)
libc.so.6 => /lib64/tls/libc.so.6 (0x00007fb284756000)
/lib64/ld-linux-x86-64.so.2 (0x00007fb285d97000)
libaprutil-1.so.0 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libaprutil-1.so.0 (0x00007fb28452f000)
libexpat.so.0 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libexpat.so.0 (0x00007fb284304000)
libapr-1.so.0 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libapr-1.so.0 (0x00007fb2840ce000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fb283f9a000)
libxml2.so.2 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libxml2.so.2 (0x00007fb283c20000)
libz.so.1 => /usr/lib64/libz.so.1 (0x00007fb283b0d000)
libboost_regex-gcc62-mt-1_65_1.so.1.65.1 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libboost_regex-gcc62-mt-1_65_1.so.1.65.1 (0x00007fb283815000)
libboost_iostreams-gcc62-mt-1_65_1.so.1.65.1 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libboost_iostreams-gcc62-mt-1_65_1.so.1.65.1 (0x00007fb283600000)
libboost_filesystem-gcc62-mt-1_65_1.so.1.65.1 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libboost_filesystem-gcc62-mt-1_65_1.so.1.65.1 (0x00007fb2833e5000)
libboost_system-gcc62-mt-1_65_1.so.1.65.1 => /home/work/elasticsearch-6.2.2/plugins/x-pack/x-pack-ml/platform/linux-x86_64/bin/../lib/./libboost_system-gcc62-mt-1_65_1.so.1.65.1 (0x00007fb2831e1000)
解决办法1：如果不需要使用machine learning功能，则可以在elasticsearch.yml中设置禁用：
xpack.ml.enabled: false
解决办法2：安装或者升级glibc；如果使用centos4.3版本，则果断升级操作系统；
如何修改临时文件目录
elasticsearch以及x-pack插件的运行，依赖于ES_TMPDIR环境变量的值作为临时文件目录；如果未设置，则默认为/tmp/elasticsearch;可通过在.bashrc或者.bash_profile文件中添加环境变量显式设置临时文件目录：
export ES_HOME=/home/work/elasticsearch-6.2.2
export ES_TMPDIR="${ES_HOME}/tmp"- 安卓客户端下载
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