ELK 之二：ElasticSearch 和Logstash高级使用
2024-03-29 04:35:08
一：文档
官方文档地址：1.x版本和2.x版本
https://www.elastic.co/guide/en/elasticsearch/guide/index.html
硬件要求：
1、内存，官方推荐64G，但是自己使用32G或16G也可以
2、CPU,核心越多越好
3、硬盘，越快越好，不建议使用NAS网络存储，官方建议使用RAID 0
4、网络，千兆或以上
5、JVM，建议使用比较新的版本，可以是openJDK或oracle的Java JDK
6、文件描述符，即可以打开的最大文件数，一定要改大
7、cluster 同一个集群要一样，集群被的各node name不能相同
8、组播和单播设置
9、JDK 内存设置不要超过32G，可以关闭Swap分区
10、锁住内存设置
动态改变配置：
PUT /_cluster/settings
{
"persistent" : {
"discovery.zen.minimum_master_nodes" :
},
"transient" : {
"indices.store.throttle.max_bytes_per_sec" : "50mb"
}
}
滚动升级或维护：
1、尽量不写新的数据，就不产生新的索引
2、关闭自动分片：
PUT /_cluster/settings
{
"transient" : {
"cluster.routing.allocation.enable" : "none"
}
}
3、关闭当前节点：
停止后会在集群当中找其他的几点并提升为主节点，并将被停止的节点的分片分配给其他节点，并将数据同步到其他节点。
POST /_cluster/nodes/_local/_shutdown
4、执行升级或维护操作
5、重启节点，会自动加入到集群
6、开启当前节点的分片功能
注意：即分片同步需要一段时间，需要等待集群状态转换为绿色即集群可用状态。
Shard rebalancing may take some time. Wait until the cluster has returned to status green before continuing.
7、对集群当中的其他节点做2-6步骤的操作
数据备份--->快照备份：curl
1、创建备份目录，节点之间需要共享一个目录，共享的文件系统需要每个节点都可以访问，并且每个节点可挂载的路径要一致
支持的共享系统：
Shared filesystem, such as a NAS
Amazon S3
HDFS (Hadoop Distributed File System)
Azure Cloud
执行挂载目录的命令：
PUT _snapshot/my_backup
{
"type": "fs",
"settings": {
"location": "/mount/backups/my_backup"
}
}
2、创建快照：
POST _snapshot/my_backup/
{
"type": "fs",
"settings": {
"location": "/mount/backups/my_backup",
"max_snapshot_bytes_per_sec" : "50mb",
"max_restore_bytes_per_sec" : "50mb"
}
}
ELK的工作原理：
使用多播进行机器发现同一个集群内的节点，并汇总各个节点的返回组成一个集群，主节点要读取各个节点的状态，在关键的时候进行数据的恢复，主节点会坚持各个节点的状态，并决定每个分片的位置，通过ping的request检测各失效的节点
三：安装logstash：
官网下载地址：
https://www.elastic.co/downloads/logstash
1、安装：
tar xvf logstash-1.5.3.zip
mv logstash-1.5.3 /usr/local/logstash
2、测试：
[root@node6 ~]# /usr/local/logstash/bin/logstash -e 'input { stdin{} } output { stdout{} }'
test
Logstash startup completed
--09T18::.891Z node6.a.com test
3、使用ruby进行更详细的输出：
需要主机能解析自己的主机名，可以在hosts文件解析：
[root@node6 ~]# /usr/local/logstash/bin/logstash -e 'input { stdin{} } output { stdout{codec => rubydebug}}'
asd
Logstash startup completed
{
"message" => "asd",
"@version" => "",
"@timestamp" => "2016-04-09T18:13:51.250Z",
"host" => "node6.a.com"
}
4、通过logstas将输出交给elasticsearch：
启动：
[root@node6 ~]# /usr/local/logstash/bin/logstash -e 'input { stdin{} } output { elasticsearch { host => "192.168.10.206" protocol => "http"} }'
'[DEPRECATED] use `require 'concurrent'` instead of `require 'concurrent_ruby'`
Logstash startup completed
5、通过logstash直接输出到屏幕：
#配置文件如下:
input {
stdin{ }
} output {
stdout { codec => rubydebug }
}
测试标准输出：
[root@elk-server2 conf.d]# /opt/logstash/bin/logstash -f /etc/logstash/conf.d/03.conf
"message" => "{\"@timestamp\":\"2016-05-14T11:24:45+08:00\",\"host\":\"192.168.0.22\",\"clientip\":\"36.104.21.88\",\"size\":650,\"responsetime\":0.000,\"upstreamtime\":\"-\",\"upstreamhost\":\"-\",\"http_host\":\"webapi.weather.com.cn\",\"url\":\"/data/\",\"domain\":\"webapi.weather.com.cn\",\"xff\":\"-\",\"referer\":\"-\",\"status\":\"200\"}",
"@version" => "",
"@timestamp" => "2016-05-14T03:25:04.068Z",
"host" => "elk-server2"
6、输入一个hello word！ 以进行测试：
[root@node6 ~]# /usr/local/logstash/bin/logstash -e 'input { stdin{} } output { elasticsearch { host => "192.168.10.206" protocol => "http"} }'
'[DEPRECATED] use `require 'concurrent'` instead of `require 'concurrent_ruby'`
Logstash startup completed
hello word!
7、查看集群管理软件head的状态：
8、进行基本查询：
9、配置文件格式：
input {
file {
path => "/var/log/messages"
type => "syslog"
}
file {
path => "/var/log/apache/access.log"
type => "apache"
}
}
10、数组类型--->多个文件：
path => [ "/var/log/messages", "/var/log/*.log" ] #通过*匹配多个文件
path => "/data/mysql/mysql.log"
11、bool类型：
ssl_enable => true
12、字节设置：
my_bytes => "" # bytes
my_bytes => "10MiB" # bytes
my_bytes => "100kib" # bytes
my_bytes => "180 mb" # bytes
13、codec：
codec => "json"
14、Hash：
match => {
"field1" => "value1"
"field2" => "value2"
...
}
15、Number--->数字：
port =>
16、Path--->密码：
my_password => "password"
17、Path---->路径：
my_path => "/tmp/logstash"
18、string-->字符串：
name => "Hello world"
四：logstash的input使用语法：
1、input,默认不支持目录的递归，即目录中还有文件是不支持直接读取的，但是可以使用*/*进行匹配。
2、exclude--->排除文件，
exclude => "*.gz"
3、sincedb_path，记录读取的时候位置，默认是一个隐藏文件
4、sincedb_write_interval，记录sincedb_path文件的写间隔，默认是15秒
5、start_position，从这个文件的什么位置开始读，默认是end，可以改成beginning
6、stat_interval，多久检测一次此文件的更新状态
五：logstash的output使用及插件：
1、可以输出到文件、rendis等
2、gzip，是否压缩，默认为false，压缩是安装数据流一点点增量压缩的
3、message_format，消息的格式
六：logstash --> file -->elasticsearch:
通过logstash输出到文件在输入到elasticsearch：
1、启动脚本：
vim /etc/init.d/logstash
[root@node6 tmp]# cat /etc/init.d/logstash
#!/bin/sh
# Init script for logstash
# Maintained by Elasticsearch
# Generated by pleaserun.
# Implemented based on LSB Core 3.1:
# * Sections: 20.2, 20.3
#
### BEGIN INIT INFO
# Provides: logstash
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start:
# Default-Stop:
# Short-Description:
# Description: Starts Logstash as a daemon.
### END INIT INFO PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/logstash/bin/
export PATH if [ `id -u` -ne ]; then
echo "You need root privileges to run this script"
exit
fi name=logstash
pidfile="/var/run/$name.pid" export JAVA_HOME=/opt/jdk1..0_45
export JRE_HOME=/opt/jdk1..0_45/jre
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$PATH LS_USER=root
LS_GROUP=root
LS_HOME=/usr/local/logstash
LS_HEAP_SIZE="512m"
LS_LOG_DIR=/usr/local/logstash
LS_LOG_FILE="${LS_LOG_DIR}/$name.log"
LS_CONF_DIR=/etc/logstash.conf
LS_OPEN_FILES=
LS_NICE=
LS_OPTS="" [ -r /etc/default/$name ] && . /etc/default/$name
[ -r /etc/sysconfig/$name ] && . /etc/sysconfig/$name program=/usr/local/logstash/bin/logstash
args="agent -f ${LS_CONF_DIR} -l ${LS_LOG_FILE} ${LS_OPTS}" quiet() {
"$@" > /dev/null >&
return $?
} start() { LS_JAVA_OPTS="${LS_JAVA_OPTS} -Djava.io.tmpdir=${LS_HOME}"
HOME=${LS_HOME}
export PATH HOME LS_HEAP_SIZE LS_JAVA_OPTS LS_USE_GC_LOGGING # chown doesn't grab the suplimental groups when setting the user:group - so we have to do it for it.
# Boy, I hope we're root here.
SGROUPS=$(id -Gn "$LS_USER" | tr " " "," | sed 's/,$//'; echo '') if [ ! -z $SGROUPS ]
then
EXTRA_GROUPS="--groups $SGROUPS"
fi # set ulimit as (root, presumably) first, before we drop privileges
ulimit -n ${LS_OPEN_FILES} # Run the program!
nice -n ${LS_NICE} chroot --userspec $LS_USER:$LS_GROUP $EXTRA_GROUPS / sh -c "
cd $LS_HOME
ulimit -n ${LS_OPEN_FILES}
exec \"$program\" $args
" > "${LS_LOG_DIR}/$name.stdout" 2> "${LS_LOG_DIR}/$name.err" & # Generate the pidfile from here. If we instead made the forked process
# generate it there will be a race condition between the pidfile writing
# and a process possibly asking for status.
echo $! > $pidfile echo "$name started."
return
} stop() {
# Try a few times to kill TERM the program
if status ; then
pid=`cat "$pidfile"`
echo "Killing $name (pid $pid) with SIGTERM"
kill -TERM $pid
# Wait for it to exit.
for i in ; do
echo "Waiting $name (pid $pid) to die..."
status || break
sleep
done
if status ; then
if [ "$KILL_ON_STOP_TIMEOUT" -eq ] ; then
echo "Timeout reached. Killing $name (pid $pid) with SIGKILL. This may result in data loss."
kill -KILL $pid
echo "$name killed with SIGKILL."
else
echo "$name stop failed; still running."
fi
else
echo "$name stopped."
fi
fi
} status() {
if [ -f "$pidfile" ] ; then
pid=`cat "$pidfile"`
if kill - $pid > /dev/null > /dev/null ; then
# process by this pid is running.
# It may not be our pid, but that's what you get with just pidfiles.
# TODO(sissel): Check if this process seems to be the same as the one we
# expect. It'd be nice to use flock here, but flock uses fork, not exec,
# so it makes it quite awkward to use in this case.
return
else
return # program is dead but pid file exists
fi
else
return # program is not running
fi
} force_stop() {
if status ; then
stop
status && kill -KILL `cat "$pidfile"`
fi
} configtest() {
# Check if a config file exists
if [ ! "$(ls -A ${LS_CONF_DIR}/* 2> /dev/null)" ]; then
echo "There aren't any configuration files in ${LS_CONF_DIR}"
return
fi HOME=${LS_HOME}
export PATH HOME JAVA_OPTS LS_HEAP_SIZE LS_JAVA_OPTS LS_USE_GC_LOGGING test_args="-f ${LS_CONF_DIR} --configtest ${LS_OPTS}"
$program ${test_args}
[ $? -eq ] && return
# Program not configured
return
} case "$1" in
start)
status
code=$?
if [ $code -eq ]; then
echo "$name is already running"
else
start
code=$?
fi
exit $code
;;
stop) stop ;;
force-stop) force_stop ;;
status)
status
code=$?
if [ $code -eq ] ; then
echo "$name is running"
else
echo "$name is not running"
fi
exit $code
;;
restart)
quiet configtest
RET=$?
if [ ${RET} -ne ]; then
echo "Configuration error. Not restarting. Re-run with configtest parameter for details"
exit ${RET}
fi
stop && start
;;
configtest)
configtest
exit $?
;;
*)
echo "Usage: $SCRIPTNAME {start|stop|force-stop|status|restart|configtest}" >&
exit
;;
esac exit $?
2、设置开机启动：
chmod a+x /etc/init.d/logstash
chkconfig --add logstash
3、编辑配置文件：
[root@node6 tmp]# vim /etc/logstash.conf
input {
file {
path => "/var/log/messages"
}
}
output {
file {
path => "/tmp/log-%{+YYYY-MM-dd}messages.gz"
gzip => true
}
}
4、测试：
[root@node6 tmp]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
测试结果：
[root@node6 tmp]# ls /tmp/
hsperfdata_root log---.messages.gz
5、把输出直接传输到elasticsearch：
[root@node6 ~]# vim /etc/logstash.conf
input {
file {
path => "/var/log/messages"
}
}
output {
file {
path => "/tmp/log-%{+YYYY-MM-dd}.messages.gz"
gzip => true
}
elasticsearch {
host => ["192.168.10.206"]
protocol => "http"
index => "system-message-%{+YYYY.MM.dd}"
}
}
6、在集群管理平台查看结果：
七：将logstash输出给redis：
1、基本语法：
db：使用的数据库，默认为0，也可以使用其他的，但是redis主从不支持其他数据库同步。
host: redis服务器的地址
key：key的名称
password：redis服务器的redis连接密码
port：redis端口，默认6379
data_type：数据类型，支持string和list，我们使用list
2、重启logstash
3、向logstash监控的文件写入数据
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
4、到redis查看结果：
[root@node5 ~]# redis-cli
127.0.0.1:> KEYS *
) "system-message-jack" #已经生成数据
127.0.0.1:> LLEN system-message-jack #查看key的长度
(integer)
127.0.0.1:> LINDEX system-message-jack -1 #查看最后一行数据
"{\"message\":\"Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]\",\"@version\":\"1\",\"@timestamp\":\"2016-04-12T08:37:51.025Z\",\"host\":\"node6.a.com\",\"path\":\"/var/log/messages\"}"
5、在重新找一台机器安装logstash，步骤参考之前的步骤：
6、另外一台logstash的配置文件：
input { #读取redis的数据
redis {
data_type => "list"
key => "system-message-jack"
host => "192.168.10.205"
port => ""
db => ""
}
}
output { #将读取到的reids的数据写入到elasticsearch
elasticsearch {
host => ["192.168.10.206"]
protocol => "http"
index => "redis-message-%{+YYYY.MM.dd}"
}
}
7、向message文件写入数据，写入的数据会读取到redis，reids的数据则会被传输给
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
[root@node6 yum.repos.d]# echo "Apr 12 14:03:53 HTC-Server2 snmpd[1573]: Connection from UDP: [60.195.252.107]:31001->[192.168.0.116]" >> /var/log/messages
8、在集群管理平台查看：
9、 查看索引：
八：分析的日志类型：
、系统日志：/var/log下的所有的内容，google每一个文件的内容
、通过ELS分析某一个访问记录
、错误日志，收集后反馈给开发
、系统运行日志
、其他类型的日志
九：日志的字段划分：
1、grok模块：通过正则表达式，比较复杂，而且当数据大的时候会占用CPU
2、json，简单易用
3、将nginx的日志设置为json模式：
安装nginx：可以编译或yum安装，省略
4、日志配置部分：
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
# log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';
#access_log /var/log/nginx/access.log main;
log_format logstash_json '{"@timestamp":"$time_iso8601",' #定义日志格式logstash_json
'"host":"$server_addr",'
'"clientip":"$remote_addr",'
'"size":$body_bytes_sent,'
'"responsetime":$request_time,'
'"upstreamtime":"$upstream_response_time",'
'"upstreamhost":"$upstream_addr",'
'"http_host":"$host",'
'"url":"$uri",'
'"domain":"$host",'
'"xff":"$http_x_forwarded_for",'
'"referer":"$http_referer",'
'"agent":"$http_user_agent",'
'"status":"$status"}';
sendfile on;
serevr配置：
#
server {
listen ;
server_name localhost;
#charset koi8-r;
access_log /var/log/nginx/json.access.log logstash_json; #日志文件保存路径及使用上面定义的日志格式logstash_json
# Load configuration files for the default server block.
include /etc/nginx/default.d/*.conf;
location / {
root /usr/share/nginx/html;
index index.html index.htm;
}
error_page 404 /404.html;
location = /404.html {
root /usr/share/nginx/html;
}
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
5、使用ab访问nginx测试日志：
[root@node5 nginx]# ab -n1000 -c10 http://192.168.10.205:9009/ #一共1000个请求，每次并发10个，即100次请求完成
6、查看日志是否有内容：
[root@node5 nginx]# tail /var/log/nginx/json.access.log
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.000,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.000,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.000,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.000,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.001,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.000,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.000,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.000,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.000,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
{"@timestamp":"2016-04-12T18:21:31+08:00","host":"192.168.10.205","clientip":"192.168.10.205","size":,"responsetime":0.000,"upstreamtime":"-","upstreamhost":"-","http_host":"192.168.10.205","url":"/index.html","domain":"192.168.10.205","xff":"-","referer":"-","agent":"ApacheBench/2.3","status":""}
7、配置logstash手机nginx的json日志并写入到redis：
[root@node5 logstash]# cat /etc/logstash.conf
input {
# redis {
# data_type => "list"
# key => "system-message-jack"
# host => "192.168.10.205"
# port => ""
# db => ""
# } file {
path => "/var/log/nginx/json.access.log" #读取指定的json格式的日志
codec => "json" #指定json格式
} } output {
# elasticsearch {
# host => ["192.168.10.206"]
# protocol => "http"
# index => "redis-message-%{+YYYY.MM.dd}"
# }
redis {
data_type => "list"
key => "nginx-json-log" #nginx的json格式日志的key名称
host => "192.168.10.205" #写入到redis服务器
port => ""
db => "" #使用redis的数据库1
}
}
8、重启logstash服务，并使用ab重新访问web地址，以产生新的日志写入redis：
[root@node5 nginx]# ab -n1000 -c10 http://192.168.10.205:9009/
9、在redis查询是否有当前key的日志：
[root@node5 nginx]# redis-cli
127.0.0.1:> SELECT
OK
127.0.0.1:[]> KEYS *
) "nginx-json-log" #已有日志
127.0.0.1:[]> LLEN nginx-json-log #日志长度
(integer)
10、配置logstash当前redis日志并输出至elasticsearch：
[root@node5 nginx]# grep "#" -v /etc/logstash.conf
input {
redis {
data_type => "list"
key => "nginx-json-log"
host => "192.168.10.205"
port => ""
db => ""
}
} output {
elasticsearch {
host => ["192.168.10.206"]
protocol => "http"
index => "nginx-json-log-%{+YYYY.MM.dd}"
}
}
11、重启logstash并使用ab批量访问web，再查看elasticsearch集群管理界面是否有nginx的json定义的nginx-json-log的key出现：
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