分佈式架構師必備--ELK日誌收集分析系統

引子

現在最流行的微服務和分佈式系統架構我想小夥伴們都很熟悉了,不管是Dubbo還是Spring Cloud我們更多是在解決服務治理,容錯,配置等方面的問題,但一個重要的問題也不能忽視,它就是日誌。尤其是對生產環境上的監控和調試日誌更是重中之重。那麼ELK便是我們分佈式日誌收集跟蹤分析的最佳解決方案。

一、ELK搭建篇

ELK是Elasticsearch、Logstash、Kibana的簡稱,這三者是核心套件,但並非全部。

Elasticsearch是實時全文搜索和分析引擎,提供蒐集、分析、存儲數據三大功能;是一套開放REST和JAVA API等結構提供高效搜索功能,可擴展的分佈式系統。它構建於Apache Lucene搜索引擎庫之上。

Logstash是一個用來蒐集、分析、過濾日誌的工具。它支持幾乎任何類型的日誌,包括系統日誌、錯誤日誌和自定義應用程序日誌。它可以從許多來源接收日誌,這些來源包括 syslog、消息傳遞(如MQ)和JMX,它能夠以多種方式輸出數據,包括電子郵件、websockets和Elasticsearch。

Kibana是一個基於Web的圖形界面,用於搜索、分析和可視化存儲在 Elasticsearch指標中的日誌數據。它利用Elasticsearch的REST接口來檢索數據,不僅允許用戶創建他們自己的數據的定製儀表板視圖,還允許他們以特殊的方式查詢和過濾數據

分佈式架構師必備--ELK日誌收集分析系統

環境

Centos6.5 兩臺
IP:192.168.1.202 安裝: elasticsearch、logstash、Kibana、Nginx、Http、Redis
192.168.1.201 安裝: logstash

安裝

安裝elasticsearch的yum源的密鑰(這個需要在所有服務器上都配置)
# rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch
配置elasticsearch的yum源
# vim /etc/yum.repos.d/elasticsearch.repo
在elasticsearch.repo文件中添加如下內容
[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

安裝elasticsearch的環境

安裝elasticsearch
# yum install -y elasticsearch
安裝java環境(java環境必須是1.8版本以上的)
wget http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.rpm
rpm -ivh jdk-8u131-linux-x64.rpm
驗證java安裝成功
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)

創建elasticsearch data的存放目錄,並修改該目錄的屬主屬組

# mkdir -p /data/es-data (自定義用於存放data數據的目錄)
# chown -R elasticsearch:elasticsearch /data/es-data

修改elasticsearch的日誌屬主屬組

# chown -R elasticsearch:elasticsearch /var/log/elasticsearch/

修改elasticsearch的配置文件

# vim /etc/elasticsearch/elasticsearch.yml
找到配置文件中的cluster.name,打開該配置並設置集群名稱
cluster.name: demon
找到配置文件中的node.name,打開該配置並設置節點名稱
node.name: elk-1
修改data存放的路徑
path.data: /data/es-data
修改logs日誌的路徑
path.logs: /var/log/elasticsearch/
配置內存使用用交換分區
bootstrap.memory_lock: true
監聽的網絡地址
network.host: 0.0.0.0
開啟監聽的端口
http.port: 9200
增加新的參數,這樣head插件可以訪問es (5.x版本,如果沒有可以自己手動加)
http.cors.enabled: true
http.cors.allow-origin: "*"

啟動elasticsearch服務

啟動服務

 /etc/init.d/elasticsearch start
Starting elasticsearch: Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 2060255232 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /tmp/hs_err_pid2616.log
[FAILED]
這個報錯是因為默認使用的內存大小為2G,虛擬機沒有那麼多的空間
修改參數:
vim /etc/elasticsearch/jvm.options
-Xms512m
-Xmx512m
再次啟動
/etc/init.d/elasticsearch start
查看服務狀態,如果有報錯可以去看錯誤日誌 less /var/log/elasticsearch/demon.log(日誌的名稱是以集群名稱命名的)
創建開機自啟動服務
# chkconfig elasticsearch on

注意事項

需要修改幾個參數,不然啟動會報錯
vim /etc/security/limits.conf
在末尾追加以下內容(elk為啟動用戶,當然也可以指定為*)
elk soft nofile 65536
elk hard nofile 65536
elk soft nproc 2048
elk hard nproc 2048
elk soft memlock unlimited

elk hard memlock unlimited
繼續再修改一個參數
vim /etc/security/limits.d/90-nproc.conf
將裡面的1024改為2048(ES最少要求為2048)
* soft nproc 2048
另外還需注意一個問題(在日誌發現如下內容,這樣也會導致啟動失敗,這一問題困擾了很久)
[2017-06-14T19:19:01,641][INFO ][o.e.b.BootstrapChecks ] [elk-1] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
[2017-06-14T19:19:01,658][ERROR][o.e.b.Bootstrap ] [elk-1] node validation exception
[1] bootstrap checks failed
[1]: system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk

解決:修改配置文件,在配置文件添加一項參數(目前還沒明白此參數的作用)
vim /etc/elasticsearch/elasticsearch.yml
bootstrap.system_call_filter: false

通過瀏覽器請求下9200的端口,看下是否成功

先檢查9200端口是否起來
netstat -antp |grep 9200
tcp 0 0 :::9200 :::* LISTEN 2934/java
瀏覽器訪問測試是否正常(以下為正常)
# curl http://127.0.0.1:9200/
{
"name" : "linux-node1",
"cluster_name" : "demon",
"cluster_uuid" : "kM0GMFrsQ8K_cl5Fn7BF-g",
"version" : {
"number" : "5.4.0",
"build_hash" : "780f8c4",
"build_date" : "2017-04-28T17:43:27.229Z",
"build_snapshot" : false,
"lucene_version" : "6.5.0"
},
"tagline" : "You Know, for Search"
}

如何和elasticsearch交互

JavaAPI
RESTful API
Javascript,.Net,PHP,Perl,Python
利用API查看狀態
# curl -i -XGET 'localhost:9200/_count?pretty'
HTTP/1.1 200 OK
content-type: application/json; charset=UTF-8
content-length: 95
{
"count" : 0,
"_shards" : {
"total" : 0,
"successful" : 0,
"failed" : 0
}
}

安裝插件

安裝elasticsearch-head插件
安裝docker鏡像或者通過github下載elasticsearch-head項目都是可以的,1或者2兩種方式選擇一種安裝使用即可
1. 使用docker的集成好的elasticsearch-head
# docker run -p 9100:9100 mobz/elasticsearch-head:5

docker容器下載成功並啟動以後,運行瀏覽器打開http://localhost:9100/
2. 使用git安裝elasticsearch-head
# yum install -y npm
# git clone git://github.com/mobz/elasticsearch-head.git
# cd elasticsearch-head
# npm install
# npm run start
檢查端口是否起來

netstat -antp |grep 9100
瀏覽器訪問測試是否正常
http://IP:9100/
分佈式架構師必備--ELK日誌收集分析系統

LogStash的使用

安裝Logstash環境:
官方安裝手冊:
https://www.elastic.co/guide/en/logstash/current/installing-logstash.html
下載yum源的密鑰認證:
# rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch
利用yum安裝logstash
# yum install -y logstash
查看下logstash的安裝目錄
# rpm -ql logstash
創建一個軟連接,每次執行命令的時候不用在寫安裝路勁(默認安裝在/usr/share下)
ln -s /usr/share/logstash/bin/logstash /bin/
執行logstash的命令
# logstash -e 'input { stdin { } } output { stdout {} }'
運行成功以後輸入:
nihao
stdout返回的結果:
分佈式架構師必備--ELK日誌收集分析系統

注:
-e 執行操作
input 標準輸入
{ input } 插件
output 標準輸出
{ stdout } 插件
通過rubydebug來輸出下更詳細的信息
# logstash -e 'input { stdin { } } output { stdout {codec => rubydebug} }'
執行成功輸入:
nihao
stdout輸出的結果:
分佈式架構師必備--ELK日誌收集分析系統

如果標準輸出還有elasticsearch中都需要保留應該怎麼玩,看下面 

# /usr/share/logstash/bin/logstash -e 'input { stdin { } } output { elasticsearch { hosts => ["192.168.1.202:9200"] } stdout { codec => rubydebug }}'
運行成功以後輸入:
I am elk
返回的結果(標準輸出中的結果):
分佈式架構師必備--ELK日誌收集分析系統

logstash使用配置文件

官方指南:
https://www.elastic.co/guide/en/logstash/current/configuration.html
創建配置文件01-logstash.conf
# vim /etc/logstash/conf.d/elk.conf
文件中添加以下內容

input { stdin { } }
output {
elasticsearch { hosts => ["192.168.1.202:9200"] }
stdout { codec => rubydebug }
}
使用配置文件運行logstash
# logstash -f ./elk.conf
運行成功以後輸入以及標準輸出結果
分佈式架構師必備--ELK日誌收集分析系統

logstash的數據庫類型

1. Input插件
權威指南:https://www.elastic.co/guide/en/logstash/current/input-plugins.html


file插件的使用
# vim /etc/logstash/conf.d/elk.conf
添加如下配置
input {
file {
path => "/var/log/messages"
type => "system"
start_position => "beginning"
}
}
output {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "system-%{+YYYY.MM.dd}"
}
}
運行logstash指定elk.conf配置文件,進行過濾匹配
#logstash -f /etc/logstash/conf.d/elk.conf
分佈式架構師必備--ELK日誌收集分析系統

來一發配置安全日誌的並且把日誌的索引按類型做存放,繼續編輯elk.conf文件

# vim /etc/logstash/conf.d/elk.conf
添加secure日誌的路徑
input {
file {
path => "/var/log/messages"
type => "system"
start_position => "beginning"
}
file {
path => "/var/log/secure"
type => "secure"
start_position => "beginning"
}
}
output {
if [type] == "system" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-system-%{+YYYY.MM.dd}"
}
}
if [type] == "secure" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-secure-%{+YYYY.MM.dd}"
}
}
}
運行logstash指定elk.conf配置文件,進行過濾匹配
# logstash -f ./elk.conf
分佈式架構師必備--ELK日誌收集分析系統

這些設置都沒有問題之後,接下來安裝下kibana,可以讓在前臺展示

Kibana的安裝及使用

安裝kibana環境
官方安裝手冊:https://www.elastic.co/guide/en/kibana/current/install.html
下載kibana的tar.gz的軟件包
# wget https://artifacts.elastic.co/downloads/kibana/kibana-5.4.0-linux-x86_64.tar.gz
解壓kibana的tar包
# tar -xzf kibana-5.4.0-linux-x86_64.tar.gz
進入解壓好的kibana
# mv kibana-5.4.0-linux-x86_64 /usr/local
創建kibana的軟連接
# ln -s /usr/local/kibana-5.4.0-linux-x86_64/ /usr/local/kibana
編輯kibana的配置文件
# vim /usr/local/kibana/config/kibana.yml
修改配置文件如下,開啟以下的配置
server.port: 5601
server.host: "0.0.0.0"
elasticsearch.url: "http://192.168.1.202:9200"
kibana.index: ".kibana"
安裝screen,以便於kibana在後臺運行(當然也可以不用安裝,用其他方式進行後臺啟動)
# yum -y install screen
# screen
# /usr/local/kibana/bin/kibana
netstat -antp |grep 5601
tcp 0 0 0.0.0.0:5601 0.0.0.0:* LISTEN 17007/node
打開瀏覽器並設置對應的index
http://IP:5601
分佈式架構師必備--ELK日誌收集分析系統

分佈式架構師必備--ELK日誌收集分析系統

二、ELK實戰篇

好,現在索引也可以創建了,現在可以來輸出nginx、apache、message、secrue的日誌到前臺展示(Nginx有的話直接修改,沒有自行安裝)

編輯nginx配置文件,修改以下內容(在http模塊下添加)
log_format json '{"@timestamp":"$time_iso8601",'
'"@version":"1",'
'"client":"$remote_addr",'
'"url":"$uri",'

'"status":"$status",'
'"domian":"$host",'
'"host":"$server_addr",'
'"size":"$body_bytes_sent",'
'"responsetime":"$request_time",'
'"referer":"$http_referer",'
'"ua":"$http_user_agent"'
'}';
修改access_log的輸出格式為剛才定義的json
access_log logs/elk.access.log json;
繼續修改apache的配置文件
LogFormat "{ \
"@timestamp": "%{%Y-%m-%dT%H:%M:%S%z}t", \
"@version": "1", \
"tags":["apache"], \
"message": "%h %l %u %t \\"%r\\" %>s %b", \
"clientip": "%a", \
"duration": %D, \
"status": %>s, \
"request": "%U%q", \
"urlpath": "%U", \
"urlquery": "%q", \
"bytes": %B, \
"method": "%m", \
"site": "%{Host}i", \
"referer": "%{Referer}i", \
"useragent": "%{User-agent}i" \
}" ls_apache_json
一樣修改輸出格式為上面定義的json格式
CustomLog logs/access_log ls_apache_json
編輯logstash配置文件,進行日誌收集
vim /etc/logstash/conf.d/full.conf
input {
file {
path => "/var/log/messages"
type => "system"
start_position => "beginning"
}
file {
path => "/var/log/secure"
type => "secure"
start_position => "beginning"
}
file {
path => "/var/log/httpd/access_log"

type => "http"
start_position => "beginning"
}
file {
path => "/usr/local/nginx/logs/elk.access.log"
type => "nginx"
start_position => "beginning"
}
}

output {
if [type] == "system" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-system-%{+YYYY.MM.dd}"
}
}
if [type] == "secure" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-secure-%{+YYYY.MM.dd}"
}
}
if [type] == "http" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-http-%{+YYYY.MM.dd}"
}
}
if [type] == "nginx" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-nginx-%{+YYYY.MM.dd}"
}
}
}
運行看看效果如何
logstash -f /etc/logstash/conf.d/full.conf
分佈式架構師必備--ELK日誌收集分析系統

可以發現所有創建日誌的索引都已存在,接下來就去Kibana創建日誌索引,進行展示(按照上面的方法進行創建索引即可),看下展示的效果

分佈式架構師必備--ELK日誌收集分析系統

接下來再來一發MySQL慢日誌的展示

由於MySQL的慢日誌查詢格式比較特殊,所以需要用正則進行匹配,並使用multiline能夠進行多行匹配(看具體配置)
input {

file {
path => "/var/log/messages"
type => "system"
start_position => "beginning"
}
file {
path => "/var/log/secure"
type => "secure"
start_position => "beginning"
}
file {
path => "/var/log/httpd/access_log"
type => "http"
start_position => "beginning"
}
file {
path => "/usr/local/nginx/logs/elk.access.log"
type => "nginx"
start_position => "beginning"
}

file {
path => "/var/log/mysql/mysql.slow.log"
type => "mysql"
start_position => "beginning"
codec => multiline {
pattern => "^# User@Host:"
negate => true
what => "previous"
}
}
}
filter {

grok {
match => { "message" => "SELECT SLEEP" }
add_tag => [ "sleep_drop" ]
tag_on_failure => []
}


if "sleep_drop" in [tags] {
drop {}
}

grok {
match => { "message" => "(?m)^# User@Host: %{USER:User}\[[^\]]+\] @ (?:(?<clienthost>\S*) )?\[(?:%{IP:Client_IP})?\]\s.*# Query_time: %{NUMBER:Query_Time:float}\s+Lock_time: %{NUMBER:Lock_Time:float}\s+Rows_sent: %{NUMBER:Rows_Sent:int}\s+Rows_examined: %{NUMBER:Rows_Examined:int}\s*(?:use %{DATA:Database};\s*)?SET timestamp=%{NUMBER:timestamp};\s*(?<query>(?<action>\w+)\s+.*)\n# Time:.*$" }
}

date {

match => [ "timestamp", "UNIX" ]
remove_field => [ "timestamp" ]
}


}

output {
if [type] == "system" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-system-%{+YYYY.MM.dd}"
}
}
if [type] == "secure" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-secure-%{+YYYY.MM.dd}"
}
}
if [type] == "http" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-http-%{+YYYY.MM.dd}"
}
}
if [type] == "nginx" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-nginx-%{+YYYY.MM.dd}"
}
}

if [type] == "mysql" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-mysql-slow-%{+YYYY.MM.dd}"
}
}
}
/<action>/<query>/<clienthost>

查看效果(一條慢日誌查詢會顯示一條,如果不進行正則匹配,那麼一行就會顯示一條)

分佈式架構師必備--ELK日誌收集分析系統

具體的日誌輸出需求,進行具體的分析

三:ELK終極篇

安裝reids 
# yum install -y redis
修改redis的配置文件
# vim /etc/redis.conf
修改內容如下
daemonize yes
bind 192.168.1.202
啟動redis服務
# /etc/init.d/redis restart
測試redis的是否啟用成功
# redis-cli -h 192.168.1.202
輸入info如果有不報錯即可
redis 192.168.1.202:6379> info
redis_version:2.4.10
....
編輯配置redis-out.conf配置文件,把標準輸入的數據存儲到redis中
# vim /etc/logstash/conf.d/redis-out.conf
添加如下內容
input {
stdin {}
}
output {
redis {
host => "192.168.1.202"
port => "6379"
password => 'test'
db => '1'
data_type => "list"
key => 'elk-test'
}
}
運行logstash指定redis-out.conf的配置文件
# /usr/share/logstash/bin/logstash -f /etc/logstash/conf.d/redis-out.conf

運行成功以後,在logstash中輸入內容(查看下效果)

分佈式架構師必備--ELK日誌收集分析系統

編輯配置redis-in.conf配置文件,把reids的存儲的數據輸出到elasticsearch中
# vim /etc/logstash/conf.d/redis-out.conf
添加如下內容
input{
redis {
host => "192.168.1.202"
port => "6379"
password => 'test'
db => '1'
data_type => "list"
key => 'elk-test'

batch_count => 1 #這個值是指從隊列中讀取數據時,一次性取出多少條,默認125條(如果redis中沒有125條,就會報錯,所以在測試期間加上這個值)
}
}
output {
elasticsearch {
hosts => ['192.168.1.202:9200']
index => 'redis-test-%{+YYYY.MM.dd}'
}
}
運行logstash指定redis-in.conf的配置文件
# /usr/share/logstash/bin/logstash -f /etc/logstash/conf.d/redis-out.conf
分佈式架構師必備--ELK日誌收集分析系統

把之前的配置文件修改一下,變成所有的日誌監控的來源文件都存放到redis中,然後通過redis在輸出到elasticsearch中 

更改為如下,編輯full.conf
input {
file {
path => "/var/log/httpd/access_log"
type => "http"
start_position => "beginning"
}
file {
path => "/usr/local/nginx/logs/elk.access.log"
type => "nginx"
start_position => "beginning"
}
file {
path => "/var/log/secure"
type => "secure"
start_position => "beginning"
}
file {
path => "/var/log/messages"
type => "system"
start_position => "beginning"
}
}
output {
if [type] == "http" {
redis {
host => "192.168.1.202"
password => 'test'
port => "6379"
db => "6"
data_type => "list"
key => 'nagios_http'
}
}
if [type] == "nginx" {
redis {
host => "192.168.1.202"
password => 'test'
port => "6379"
db => "6"
data_type => "list"
key => 'nagios_nginx'
}
}
if [type] == "secure" {
redis {
host => "192.168.1.202"
password => 'test'
port => "6379"
db => "6"

data_type => "list"
key => 'nagios_secure'
}
}
if [type] == "system" {
redis {
host => "192.168.1.202"
password => 'test'
port => "6379"
db => "6"
data_type => "list"
key => 'nagios_system'
}
}
}
運行logstash指定shipper.conf的配置文件
# /usr/share/logstash/bin/logstash -f /etc/logstash/conf.d/full.conf
在redis中查看是否已經將數據寫到裡面(有時候輸入的日誌文件不產生日誌,會導致redis裡面也沒有寫入日誌)
分佈式架構師必備--ELK日誌收集分析系統

把redis中的數據讀取出來,寫入到elasticsearch中(需要另外一臺主機做實驗)
編輯配置文件
# vim /etc/logstash/conf.d/redis-out.conf
添加如下內容
input {
redis {
type => "system"
host => "192.168.1.202"
password => 'test'
port => "6379"
db => "6"
data_type => "list"
key => 'nagios_system'
batch_count => 1
}

redis {
type => "http"
host => "192.168.1.202"
password => 'test'
port => "6379"
db => "6"
data_type => "list"
key => 'nagios_http'
batch_count => 1
}
redis {
type => "nginx"
host => "192.168.1.202"
password => 'test'
port => "6379"
db => "6"
data_type => "list"
key => 'nagios_nginx'
batch_count => 1
}

redis {
type => "secure"
host => "192.168.1.202"
password => 'test'
port => "6379"
db => "6"
data_type => "list"
key => 'nagios_secure'

batch_count => 1
}
}

output {

if [type] == "system" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-system-%{+YYYY.MM.dd}"
}
}
if [type] == "http" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-http-%{+YYYY.MM.dd}"
}
}
if [type] == "nginx" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-nginx-%{+YYYY.MM.dd}"
}
}
if [type] == "secure" {
elasticsearch {
hosts => ["192.168.1.202:9200"]
index => "nagios-secure-%{+YYYY.MM.dd}"
}
}
}
注意:
input是從客戶端收集的
output是同樣也保存到192.168.1.202中的elasticsearch中,如果要保存到當前的主機上,可以把output中的hosts修改成localhost,如果還需要在kibana中顯示,需要在本機上部署kabana,為何要這樣做,起到一個松耦合的目的
說白了,就是在客戶端收集日誌,寫到服務端的redis裡或是本地的redis裡面,輸出的時候對接ES服務器即可
運行命令看看效果
# /usr/share/logstash/bin/logstash -f /etc/logstash/conf.d/redis-out.conf

效果是和直接往ES服務器輸出一樣的(這樣是先將日誌存到redis數據庫,然後再從redis數據庫裡取出日誌)

分佈式架構師必備--ELK日誌收集分析系統

上線ELK

1. 日誌分類
系統日誌 rsyslog logstash syslog插件
訪問日誌 nginx logstash codec json
錯誤日誌 file logstash mulitline
運行日誌 file logstash codec json
設備日誌 syslog logstash syslog插件

Debug日誌 file logstash json 或者 mulitline
2. 日誌標準化
路徑 固定
格式 儘量json
3. 系統個日誌開始-->錯誤日誌-->運行日誌-->訪問日誌

因為ES保存日誌是永久保存,所以需要定期刪除一下日誌,下面命令為刪除指定時間前的日誌

curl -X DELETE http://xx.xx.com:9200/logstash-*-`date +%Y-%m-%d -d "-$n days"`


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