Linux（centos）安装es（elasticsearch）
前提条件——需要安装jdk环境，不同版本的es所对应的jdk版本要求不同，es6的使用jdk1.8可以
1、下载elasticsearch压缩包 下载地址：https://www.elastic.co/cn/downloads/past-releases/elasticsearch-6-6-0，点击下载
2、上传到centos上，我们这里上传到 /usr/web/elasticsearch 文件夹下，并解压文件
tar -zxvf elasticsearch-6.6.0.tar.gz
3、进入解压后目录
cd elasticsearch-6.6.0/bin
启动
./elasticsearch
出现以下报错，这是因为elasticsearch为了安全性，是不能用root用户启动的。 切换其他账号，或者新建账号 创建账号可以参考 https://www.cnblogs.com/pxblog/p/13572044.html
[2020-04-04T16:34:31,537][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [unknown] 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:163) ~[elasticsearch-6.6.0.jar:6.6.0] at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-6.6.0.jar:6.6.0] at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.6.0.jar:6.6.0] at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.6.0.jar:6.6.0] at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.6.0.jar:6.6.0] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:116) ~[elasticsearch-6.6.0.jar:6.6.0] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[elasticsearch-6.6.0.jar:6.6.0] Caused by: java.lang.RuntimeException: can not run elasticsearch as root at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:103) ~[elasticsearch-6.6.0.jar:6.6.0] at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:170) ~[elasticsearch-6.6.0.jar:6.6.0] at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:333) ~[elasticsearch-6.6.0.jar:6.6.0] at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-6.6.0.jar:6.6.0] ... 6 more
重新使用启动命令，出现以下报错，报这个错是因为用户的权限不足，因此在配置和启动ElasticSearch节点的时候要注意给用户赋予对应的权限
Exception in thread "main" java.nio.file.AccessDeniedException: /usr/web/elasticsearch/elasticsearch-6.6.0/config/jvm.options at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84) at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102) at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107) at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214) at java.nio.file.Files.newByteChannel(Files.java:361) at java.nio.file.Files.newByteChannel(Files.java:407) at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384) at java.nio.file.Files.newInputStream(Files.java:152) at org.elasticsearch.tools.launchers.JvmOptionsParser.main(JvmOptionsParser.java:60)
现在切换到root账号，执行以下命令，执行完之后需要在切换到原来的账号
chown -R elas:elas /usr/web/elasticsearch
其中，elas是用户名 后面是elasticsearch文件路径
在开发使用过程中，我们可以限制elasticsearch使用的内存大小
进入elasticsearch的目录下config文件夹
vim jvm.options
注：如果打开是空的，可能是由于没有权限，使用root账号进行修改
elasticsearch 要求至少1g启动内存，所以内存不够，我们可以设置的小一点，修改为256m，如图所示
修改完成之后，保存退出
现在默认我们只能在linux服务器上访问elasticsearch ，如果要使得我们在外网也能访问 elasticsearch ，需要修改配置文件
进入elasticsearch文件目录下的config文件夹中
vim elasticsearch.yml
默认是
修改成
注：9200是外网访问端口，所以如果启动了防火墙，需要把端口配置下，可以参照：https://www.cnblogs.com/pxblog/p/12222150.html
（需要9200和9300两个端口都要开启，9200是web端访问端口，9300是开发程序访问端口）
修改完成之后，保存退出
然后进入bin目录启动，重新启动
如果出现以下报错
org.elasticsearch.bootstrap.StartupException: BindTransportException[Failed to bind to [9300-9400]]; nested: BindException[无法指定被请求的地址];
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:163) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.7.2.jar:6.7.2]
at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.7.2.jar:6.7.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:116) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[elasticsearch-6.7.2.jar:6.7.2]
Caused by: org.elasticsearch.transport.BindTransportException: Failed to bind to [9300-9400]
at org.elasticsearch.transport.TcpTransport.bindToPort(TcpTransport.java:408) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.transport.TcpTransport.bindServer(TcpTransport.java:375) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.transport.netty4.Netty4Transport.doStart(Netty4Transport.java:136) ~[?:?]
at org.elasticsearch.xpack.core.security.transport.netty4.SecurityNetty4Transport.doStart(SecurityNetty4Transport.java:127) ~[?:?]
at org.elasticsearch.xpack.security.transport.netty4.SecurityNetty4ServerTransport.doStart(SecurityNetty4ServerTransport.java:46) ~[?:?]
at org.elasticsearch.common.component.AbstractLifecycleComponent.start(AbstractLifecycleComponent.java:72) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.transport.TransportService.doStart(TransportService.java:228) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.common.component.AbstractLifecycleComponent.start(AbstractLifecycleComponent.java:72) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.node.Node.start(Node.java:741) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:269) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:342) ~[elasticsearch-6.7.2.jar:6.7.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-6.7.2.jar:6.7.2]
... 6 more
Caused by: java.net.BindException: 无法指定被请求的地址
at sun.nio.ch.Net.bind0(Native Method) ~[?:?]
at sun.nio.ch.Net.bind(Net.java:433) ~[?:?]
at sun.nio.ch.Net.bind(Net.java:425) ~[?:?]
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[?:?]
at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:130) ~[?:?]
at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:562) ~[?:?]
at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1358) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:501) ~[?:?]
at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:486) ~[?:?]
at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:1019) ~[?:?]
at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:258) ~[?:?]
at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:366) ~[?:?]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) ~[?:?]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404) ~[?:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:474) ~[?:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909) ~[?:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]
将上一步中的elasticsearch.yml 的network.host改成0.0.0.0
出现以下报错 说明现在的环境不符合elasticsearch的要求
ERROR: [1] bootstrap checks failed [1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536] [2020-04-04T17:47:27,880][INFO ][o.e.n.Node ] [5GagyKc] stopping ... [2020-04-04T17:47:27,965][INFO ][o.e.n.Node ] [5GagyKc] stopped [2020-04-04T17:47:27,965][INFO ][o.e.n.Node ] [5GagyKc] closing ... [2020-04-04T17:47:27,979][INFO ][o.e.n.Node ] [5GagyKc] closed
（1）、修改系统配置文件 （切换到root用户）
vim /etc/security/limits.conf
增加以下内容，如图所示
* hard nofile 655360 * soft nofile 131072 * hard nproc 4096 * soft nproc 4096
其中：
nofile - 打开文件的最大数目
noproc - 进程的最大数目
soft 指的是当前系统生效的设置值
hard 表明系统中所能设定的最大值
然后保存退出
（2）修改系统最大内存数，进入
vim /etc/sysctl.conf
默认是
修改为
如果没有上述内容，直接添加以下内容进去即可
vm.max_map_count=655360 fs.file-max=655360
修改好之后，保存退出
使的我们修改的配置文件生效
sysctl -p
重新启动。切换到普通账号启动elasticsearch，启动成功后，我们可以使用 -d 命令进行后台启动，进入elasticsearch文件夹目录的bin文件夹
./elasticsearch -d
或者
nohup ./elasticsearch &
打开浏览器输入
{
"name" : "5GagyKc",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "ziiT6TFMSiaTuDqjEwrlfA",
"version" : {
"number" : "6.6.0",
"build_flavor" : "default",
"build_type" : "tar",
"build_hash" : "a9861f4",
"build_date" : "2019-01-24T11:27:09.439740Z",
"build_snapshot" : false,
"lucene_version" : "7.6.0",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "You Know, for Search"
}
其中 192.168.0.102 是我的虚拟机地址
关闭程序
[root@localhost ~]# ps -ef|grep elastic elas+ 47702 1 10 17:19 pts/1 00:00:20 /usr/web/java/jdk1.8/bin/java -Xms256m -Xmx256m -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -Des.networkaddress.cache.ttl=60 -Des.networkaddress.cache.negative.ttl=10 -XX:+AlwaysPreTouch -Xss1m -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djna.nosys=true -XX:-OmitStackTraceInFastThrow -Dio.netty.noUnsafe=true -Dio.netty.noKeySetOptimization=true -Dio.netty.recycler.maxCapacityPerThread=0 -Dlog4j.shutdownHookEnabled=false -Dlog4j2.disable.jmx=true -Djava.io.tmpdir=/tmp/elasticsearch-4781675233424590824 -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=data -XX:ErrorFile=logs/hs_err_pid%p.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution -XX:+PrintGCApplicationStoppedTime -Xloggc:logs/gc.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=32 -XX:GCLogFileSize=64m -Des.path.home=/usr/web/elasticsearch/elasticsearch-6.6.0 -Des.path.conf=/usr/web/elasticsearch/elasticsearch-6.6.0/config -Des.distribution.flavor=default -Des.distribution.type=tar -cp /usr/web/elasticsearch/elasticsearch-6.6.0/lib/* org.elasticsearch.bootstrap.Elasticsearch -d
然后杀掉对应的进程
kill 47702
es（elasticsearch）安装IK中文分词器参考：https://www.cnblogs.com/pxblog/p/12633189.html
centos7使用docker安装es(elasticsearch)：参考：https://www.cnblogs.com/pxblog/p/12234561.html
-----------------------有任何问题可以在评论区评论，也可以私信我，我看到的话会进行回复，欢迎大家指教------------------------
（蓝奏云官网有些地址失效了，需要把请求地址lanzous改成lanzoux才可以）
