标签：elk
ELK是Elasticsearch、Logstash、Kibana的简称，这三者是核心套件，但并非全部。
Elasticsearch是实时全文搜索和分析引擎，提供搜集、分析、存储数据三大功能；是一套开放REST和JAVA API等结构提供高效搜索功能，可扩展的分布式系统。它构建于Apache Lucene搜索引擎库之上。
Logstash是一个用来搜集、分析、过滤日志的工具。它支持几乎任何类型的日志，包括系统日志、错误日志和自定义应用程序日志。它可以从许多来源接收日志，这些来源包括 syslog、消息传递（例如 RabbitMQ）和JMX，它能够以多种方式输出数据，包括电子邮件、websockets和Elasticsearch。
Kibana是一个基于Web的图形界面，用于搜索、分析和可视化存储在 Elasticsearch指标中的日志数据。它利用Elasticsearch的REST接口来检索数据，不仅允许用户创建他们自己的数据的定制仪表板视图，还允许他们以特殊的方式查询和过滤数据
一.环境准备
关闭Selinux
关闭防火墙
Centos7.2 mini
A: 192.168.1.241 es && kibana
B: 192.168.1.242 logstach
C: 192.168.1.243 redis
D: 192.168.1.221 Filebeat代理 (client):将其日志发送到Logstash的客户端服务器
每台服务器都安装Java环境，1.8以上 jdk-8u131-linux-x64.rpm
rpm -ivh jdk-8u131-linux-x64.rpm
[root@logstach java]# java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
[root@logstach java]# which java
/usr/bin/java
这里说明下，用rpm包方式安装的Java 默认的安装路径是在/usr/java下，要记住：
vi /etc/profile
JAVA_HOME=/usr/java/jdk1.8.0_131
JRE_HOME=/usr/java/jdk1.8.0_131/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
source /etc/profile
二.安装logsstach
在服务器B上：
vim /etc/yum.repos.d/elasticsearch.repo #增加ELK源
[logstash-5.x]
name=Elastic repository for 5.x packages
baseurl=https://artifacts.elastic.co/packages/5.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md
yum makecache
yum install logstash -y # logstash-5.5.1
cd /usr/share/logstash
bin/logstash -e ‘input{stdin{}}output{stdout{codec=>rubydebug}}‘
[root@logstach logstash]# bin/logstash -e ‘input{stdin{}}output{stdout{codec=>rubydebug}}‘
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
WARNING: Could not find logstash.yml which is typically located in $LS_HOME/config or /etc/logstash. You can specify the path using --path.settings. Continuing using the defaults
Could not find log4j2 configuration at path //usr/share/logstash/config/log4j2.properties. Using default config which logs to console
09:36:20.791 [[main]-pipeline-manager] INFO logstash.pipeline - Starting pipeline {"id"=>"main", "pipeline.workers"=>1, "pipeline.batch.size"=>125, "pipeline.batch.delay"=>5, "pipeline.max_inflight"=>125}
09:36:20.899 [[main]-pipeline-manager] INFO logstash.pipeline - Pipeline main started
The stdin plugin is now waiting for input:
09:36:21.008 [Api Webserver] INFO logstash.agent - Successfully started Logstash API endpoint {:port=>9600}
hello world
{
"@timestamp" => 2017-08-12T01:36:29.687Z,
"@version" => "1",
"host" => "0.0.0.0",
"message" => "hello world"
}
出现红色字体的报错忽略即可，logstash.agent - Successfully started Logstash API endpoint {:port=>9600}出现后，输入hello world 即可。
修改环境变量：
vi /etc/profile.d/logstash.sh
export PATH=/usr/share/logstash/bin:$PATH
source /etc/profile
logstash 命令可以顺便使用了
logstash -e ‘input{stdin{}}output{stdout{codec=>rubydebug}}‘
创建简单配置文件：
vi /etc/logstash/conf.d/sample.conf
input {
stdin {}
}
output {
stdout {
codec => rubydebug
}
}
[root@logstach conf.d]# logstash -f /etc/logstash/conf.d/sample.conf #启动
三.安装es && kibana
在服务器A上：
vim /etc/yum.repos.d/elasticsearch.repo
[elasticsearch-5.x]
name=Elasticsearch repository for 5.x packages
baseurl=https://artifacts.elastic.co/packages/5.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md
yum makecache
yum install elasticsearch -y
systemctl daemon-reload
systemctl enable elasticsearch.service
systemctl start elasticsearch.service
[root@es bin]# ./elasticsearch
Exception in thread "main" org.elasticsearch.bootstrap.BootstrapException: java.nio.file.NoSuchFileException: /usr/share/elasticsearch/config
Likely root cause: java.nio.file.NoSuchFileException: /usr/share/elasticsearch/config
at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at sun.nio.fs.UnixFileAttributeViews$Basic.readAttributes(UnixFileAttributeViews.java:55)
at sun.nio.fs.UnixFileSystemProvider.readAttributes(UnixFileSystemProvider.java:144)
at sun.nio.fs.LinuxFileSystemProvider.readAttributes(LinuxFileSystemProvider.java:99)
at java.nio.file.Files.readAttributes(Files.java:1737)
at java.nio.file.FileTreeWalker.getAttributes(FileTreeWalker.java:225)
at java.nio.file.FileTreeWalker.visit(FileTreeWalker.java:276)
at java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:322)
at java.nio.file.Files.walkFileTree(Files.java:2662)
at org.elasticsearch.common.logging.LogConfigurator.configure(LogConfigurator.java:150)
at org.elasticsearch.common.logging.LogConfigurator.configure(LogConfigurator.java:122)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:316)
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:123)
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:114)
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:67)
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122)
at org.elasticsearch.cli.Command.main(Command.java:88)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:91)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:84)
Refer to the log for complete error details.
这个错误我觉得主要是因为找不到配置文件,但是如果你直接在安装目录里去启动elasticsearch的话，elasticsearch只会在当前目录找config文件夹，如果安装成service的形式应该是可以找到配置文件，但我没去尝试，后面试试。
问题知道了，我们可以直接把/etc目录下的elasticsearch配置文件copy过来：
cp -r /etc/elasticsearch /usr/share/elasticsearch/config
这个时候我们再启动就不会报刚才的错误了，我们再试一遍：bin/elasticsearch
意料之中，这时候会提示以下错误：
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-5.1.2.jar:5.1.2] at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-5.1.2.jar:5.1.2] at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54) ~[elasticsearch-5.1.2.jar:5.1.2] at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122) ~[elasticsearch-5.1.2.jar:5.1.2] at org.elasticsearch.cli.Command.main(Command.java:88) ~[elasticsearch-5.1.2.jar:5.1.2] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:89) ~[elasticsearch-5.1.2.jar:5.1.2] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:82) ~[elasticsearch-5.1.2.jar:5.1.2] Caused by: java.lang.RuntimeException: can not run elasticsearch as root at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:100) ~[elasticsearch-5.1.2.jar:5.1.2] at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:176) ~[elasticsearch-5.1.2.jar:5.1.2] at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:306) ~[elasticsearch-5.1.2.jar:5.1.2] at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-5.1.2.jar:5.1.2] ... 6 more
这个错误的原因是elasticsearch不允许使用root启动，因此我们要解决这个问题需要新建一个用户来启动elasticsearch(参考：https://my.oschina.net/topeagle/blog/591451?fromerr=mzOr2qzZ)
具体操作如下：
~ groupadd elsearch
~ useradd elsearch -g elsearch -p elsearch
~ cd /usr/share
chown -R elsearch:elsearch elasticsearch
su elsearch
这个时候在这个用户去启动elasticsearch，一般情况下这个时候就能成功起来了，可能还会出现一些错误，如：
hcw-X450VC% ./elasticsearch2017-01-17 21:03:31,158 main ERROR Could not register mbeans java.security.AccessControlException: access denied ("javax.management.MBeanTrustPermission" "register") at java.security.AccessControlContext.checkPermission(AccessControlContext.java:472) at java.lang.SecurityManager.checkPermission(SecurityManager.java:585) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.checkMBeanTrustPermission(DefaultMBeanServerInterceptor.java:1848) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:322) at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522) at org.apache.logging.log4j.core.jmx.Server.register(Server.java:389) at org.apache.logging.log4j.core.jmx.Server.reregisterMBeansAfterReconfigure(Server.java:167) at org.apache.logging.log4j.core.jmx.Server.reregisterMBeansAfterReconfigure(Server.java:140) at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:541) at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:258) at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:206) at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:220) at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:197) at org.elasticsearch.common.logging.LogConfigurator.configureStatusLogger(LogConfigurator.java:125) at org.elasticsearch.common.logging.LogConfigurator.configureWithoutConfig(LogConfigurator.java:67) at org.elasticsearch.cli.Command.main(Command.java:85) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:89) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:82)这是因为elasticsearch需要读写配置文件，我们需要给予config文件夹权限，上面新建了elsearch用户，elsearch用户不具备读写权限，因此还是会报错，解决方法是切换到管理员账户，赋予权限即可：
sudo -i chmod -R 775 config
这个时候就可以起来了，来看看效果：
[root@es ~]# curl 127.0.0.1:9200
{
"name" : "tZhA-Rw",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "OzC1IJd3Sg66bwDv7AAUHw",
"version" : {
"number" : "5.5.1",
"build_hash" : "19c13d0",
"build_date" : "2017-07-18T20:44:24.823Z",
"build_snapshot" : false,
"lucene_version" : "6.6.0"
},
"tagline" : "You Know, for Search"
这里如果想开房外网访问：
{
"name" : "qO-BHYV",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "7nmo0Io_SDOQ5Gt7AV7fjw",
"version" : {
"number" : "5.5.1",
"build_hash" : "19c13d0",
"build_date" : "2017-07-18T20:44:24.823Z",
"build_snapshot" : false,
"lucene_version" : "6.6.0"
},
"tagline" : "You Know, for Search"
}需要修改/etc/elasticsearch/elasticsearch.yml这个文件（虽然前面我们复制它到了/usr/share/elasticsearch/config）下了，但配置文件生效的确是/etc/elasticsearch/elasticsearch.yml
这点要特别的注意：
cluster.name: ptsearch # 组名（同一个组，组名必须一致）
node.name: yunwei-ts-100-70 # 节点名称，建议和主机名一致
path.data: /data/elasticsearch # 数据存放的路径
path.logs: /var/log/elasticsearch/ # 日志存放的路径
bootstrap.mlockall: true # 锁住内存，不被使用到交换分区去
network.host: 0.0.0.0 # 网络设置
http.port: 9200 # 端口
discovery.zen.ping.unicast.hosts: ["172.16.100.71","172.16.100.111"] #手动发现节点,写本机之外的集群节点IP地址
discovery.zen.ping.multicast.enabled: false #关闭多播模式
```
==以上配置3台elasticsearch节点都要配，注意nodename写每台主机的名称，discovery.zen.ping.unicast.hosts:xie写本机之外的集群节点IP地址。==
标签：elk
原文地址：http://mxlmgl.blog.51cto.com/9834691/1956237
