promethues
前言:
最近項目中用到了promethues做服務告警,這裏就把自己探索過程中收集到的文檔整理出來,以及一些自己使用過程中的東西
簡介
Prometheus 是一套開源的系統監控報警框架。它啓發於 Google 的 borgmon 監控系統,由工作在 SoundCloud 的
google 前員工在 2012 年創建,作爲社區開源項目進行開發,並於 2015 年正式發佈。2016 年,Prometheus 正式加入
Cloud Native Computing Foundation,成爲受歡迎度僅次於 Kubernetes 的項目。
有人可能會疑惑:promethues和grafana結合豈不是可以把預警、日誌分析全做了?
其實官方強烈不推薦使用promethues和grafana做日誌分析的,官方解釋日誌分析還是交由專業的ELK去做,不建議使用promethues和grafana。
作爲新一代的監控框架,Prometheus 具有以下特點:
- 強大的多維度數據模型:
- 時間序列數據通過 metric 名和鍵值對來區分。
- 所有的 metrics 都可以設置任意的多維標籤。
- 數據模型更隨意,不需要刻意設置爲以點分隔的字符串。
- 可以對數據模型進行聚合,切割和切片操作。
- 支持雙精度浮點類型,標籤可以設爲全 unicode。
- 靈活而強大的查詢語句(PromQL):在同一個查詢語句,可以對多個 metrics 進行乘法、加法、連接、取分數位等操作。
- 易於管理: Prometheus server 是一個單獨的二進制文件,可直接在本地工作,不依賴於分佈式存儲。
- 高效:平均每個採樣點僅佔 3.5 bytes,且一個 Prometheus server 可以處理數百萬的 metrics。
- 使用 pull 模式採集時間序列數據,這樣不僅有利於本機測試而且可以避免有問題的服務器推送壞的 metrics。
- 可以採用 push gateway 的方式把時間序列數據推送至 Prometheus server 端。
- 可以通過服務發現或者靜態配置去獲取監控的 targets。
- 有多種可視化圖形界面。
- 易於伸縮。
需要指出的是,由於數據採集可能會有丟失,所以 Prometheus 不適用對採集數據要 100% 準確的情形。但如果用於記錄時間序列數據,Prometheus 具有很大的查詢優勢,此外,Prometheus 適用於微服務的體系架構
組成&工作流
架構
如圖所示,即爲promethues的架構圖
概念介紹
Prometheus Server:
Prometheus Sever是Prometheus組件中的核心部分,負責實現對監控數據的獲取,存儲及查詢。Prometheus
Server可以通過靜態配置管理監控目標,也可以配合使用Service
Discovery的方式動態管理監控目標,並從這些監控目標中獲取數據。其次Prometheus
Sever需要對採集到的數據進行存儲,Prometheus
Server本身就是一個實時數據庫,將採集到的監控數據按照時間序列的方式存儲在本地磁盤當中。Prometheus
Server對外提供了自定義的PromQL,實現對數據的查詢以及分析。另外Prometheus
Server的聯邦集羣能力可以使其從其他的Prometheus Server實例中獲取數據。
Exporters:
Exporter將監控數據採集的端點通過HTTP服務的形式暴露給Prometheus Server,Prometheus
Server通過訪問該Exporter提供的Endpoint端點,即可以獲取到需要採集的監控數據。可以將Exporter分爲2類:
直接採集:
這一類Exporter直接內置了對Prometheus監控的支持,比如cAdvisor,Kubernetes,Etcd,Gokit等,都直接內置了用於向Prometheus暴露監控數據的端點。
間接採集:
原有監控目標並不直接支持Prometheus,因此需要通過Prometheus提供的Client
Library編寫該監控目標的監控採集程序。例如:Mysql Exporter,JMX Exporter,Consul Exporter等。
AlertManager:
在Prometheus Server中支持基於Prom QL創建告警規則,如果滿足Prom
QL定義的規則,則會產生一條告警。在AlertManager從 Prometheus server 端接收到
alerts後,會進行去除重複數據,分組,並路由到對收的接受方式,發出報警。常見的接收方式有:電子郵件,pagerduty,webhook
等。
PushGateway:
Prometheus數據採集基於Prometheus Server從Exporter pull數據,因此當網絡環境不允許Prometheus
Server和Exporter進行通信時,可以使用PushGateway來進行中轉。通過PushGateway將內部網絡的監控數據主動Push到Gateway中,Prometheus
Server採用針對Exporter同樣的方式,將監控數據從PushGateway pull到Prometheus Server。
Prometheus的工作流:
pull(拉取)
Prometheus
server定期從配置好的jobs或者exporters中拉取metrics(所有拉取規則都是在rules.yml配置文件中配置),或者接收來自Pushgateway發送過來的metrics,或者從其它的Prometheus
server中拉metrics。
存儲
Prometheus server在本地存儲收集到的metrics,並運行定義好的alerts.rules,記錄新的時間序列或者向Alert
manager推送警報。
預警
Alertmanager根據配置文件,對接收到的警報進行處理,發出告警。
展示
在圖形界面中,可視化採集數據。可以採用Grafana做最後的圖形展示。
安裝和配置
文中promethues相關下載鏈接(提前公示),點擊此處即可跳轉
包含以下:
- prometheus
- alertmanager
- node_exporter
其他的官方提供的exporter(提前公示),點擊此處即可跳轉
一、oracle監控安裝
它是用來監控oracle數據庫的,可以和oracle安裝在同一個服務器,也可以不同,這裏建議還是不要裝在一臺服務器上,對數據庫服務器是有性能上的影響的。
1.1 首先需要下載以下安裝包:
oracledb_exporter.0.2.2.linux-amd64.tar.gz ===>地址:https://prometheus.io/docs/instrumenting/exporters/
以下三個地址:====>https://www.oracle.com/database/technologies/instant-client/linux-x86-64-downloads.html
oracle-instantclient18.5-basic-18.5.0.0.0-3.x86_64.rpm
oracle-instantclient18.5-devel-18.5.0.0.0-3.x86_64.rpm
oracle-instantclient18.5-sqlplus-18.5.0.0.0-3.x86_64.rpm
1.2 安裝:
1.2.1 如果是centos系統可以直接安裝這三個oracle客戶端組件,安裝命令:
rpm -ivh 包全名
1.2.2 如果是Ubuntu系統,則需要轉換爲Ubuntu的安裝包,再進行安裝,轉換命令如下:
sudo apt-get install alien #alien默認沒有安裝,所以首先要安裝它
sudo alien xxxx.rpm #將rpm轉換位deb,完成後會生成一個同名的xxxx.deb
sudo dpkg -i xxxx.deb #安裝
1.3 環境變量設置:
修改環境變量
vim /etc/profile
文件末尾追加這三個環境變量
export DATA_SOURCE_NAME=oracle_exporter/Wl4L7CDM5@//172.30.130.116:1521/orcl #這裏填寫監控用的用戶名及密碼,需要注意的是,這個用戶必須具有dba權限。
export LD_LIBRARY_PATH=/usr/lib/oracle/18.5/client64/lib:/usr/lib/oracle/18.5/client64 #這裏是oracle客戶端安裝完後的位置,自行去'/usr/lib/oracle/'這個目錄下覈查目錄路徑是否正確,如果版本號不對,手動修改這個值
export ORACLE_HOME=/usr/lib/oracle/18.5/client64 #覈對目錄並檢查版本號
之後使環境變量生效即可
source /etc/profile
1.4 安裝oracledb_exporter
他不需要安裝,解壓即可使用
tar -zxvf oracledb_exporter.0.2.2.linux-amd64.tar.gz
cd oracledb_exporter.0.2.2.linux-amd64
nohup ./oracledb_exporter &
二、 node_exporter安裝
它是用來監控各節點的狀態,需要安裝在各需要監控的服務器上,一個服務器安裝一個。下載的地址如下:
https://prometheus.io/docs/instrumenting/exporters/
在上述地址請求後的頁面中找到要下載的node_exporter,並下載。
下載後:
1. mkdir -p /server/deployment/
2. 將node_exporter-0.18.1.linux-amd64.tar.gz移至/server/deployment/
3. 解壓node_exporter-0.18.1.linux-amd64.tar.gz =====》命令: tar -zxvf node_exporter-0.18.1.linux-amd64.tar.gz
4. 進入到/server/deployment/node_exporter-0.18.1.linux-amd64 ===>命令: cd /server/deployment/node_exporter-0.18.1.linux-amd64
5. nohup /server/deployment/node_exporter-0.18.1.linux-amd64/node_exporter & #後臺啓動即可
他的默認監聽端口是9100,如果發現與本機的服務端口有所衝突,可以指定其監聽的端口。但是需要注意的是,修改完監聽端口後,一定要在 3.2.1 prometheus.yml配置 中修改你所指定的這個端口。
修改默認端口的命令(將下面的9100改爲你所要監聽的指定端口):
nohup /server/deployment/node_exporter-0.18.1.linux-amd64/node_exporter --web.listen-address=":9100" &
三、安裝promethues
他是用來彙總監控信息的中央控制器,並且會發送告警信息給alertmanager
3.1 下載prometheus-2.15.2.linux-amd64.tar.gz
https://prometheus.io/download/
選擇自己需要的版本進行下載
3.2 解壓即可用,重要的是需要進行配置
注意:
- 這裏的格式一定不要錯亂,要保證嚴格的yml格式,比如最簡單的各種對齊,否則啓動會報錯
- 項目中有的機器會出現中文不兼容的問題,所以最好將我下文中的模板中中文註釋去除
3.2.1 prometheus.yml配置
global:
scrape_interval: 15s #全局的間隔請求時間
evaluation_interval: 15s #指的是計算rule的間隔
scrape_timeout: 10s #間隔請求超時時間,這個是不能大於scrape_interval的
external_labels:
monitor: 'codelab_monitor'
alerting:
alertmanagers: #這個是alertmanager的配置,用來最後發出告警信息的模塊,在哪安裝的他,就配置安裝的信息即可,他的默認端口號是9093
- static_configs:
- targets: ["localhost:9093"]
rule_files:
- "/server/prometheus-2.18.0-rc.0.linux-amd64/rules.yml" #prometheus的告警規則配置文件地址
scrape_configs:
- job_name: 'prometheus'
static_configs:
- targets: ['localhost:9090']
- job_name: 'node' #各節點的配置信息,這裏配置的主要是node_exporter的監控信息,如果你沒有對他的默認端口進行修改,那麼就寫9100即可
static_configs:
- targets: ['{IP}:9100'] #爲了通用性,我將服務器ip換成了{IP},使用時將其替換成真正的ip地址即可
- job_name: 'nginx'
scrape_interval: 5s #在這裏配置這個請求間隔時間是會覆蓋掉global裏的全局間隔時間的
static_configs:
- targets: ['{IP}:9913']
- job_name: 'oracle'
scrape_interval: 10s
static_configs:
- targets: ['localhost:9161'] #這些端口號並不是隨意填寫的,他們都是各個監控器的監聽端口,這個是oracledb_exporter
- job_name: 'redis'
scrape_interval: 10s
static_configs:
- targets: ['{IP1}:9121','{IP2}:9121']
- job_name: ‘rabbit_mq'
scrape_interval:10s
static_configs:
- targets: ['{IP1}:9419']
3.2.2 rules.yml配置
在prometheus文件夾下新建rules.yml,這個是告警規則,有的服務器不支持中文,有的支持,不支持的話翻譯成英文即可,當然,寫英文的更好,防止亂碼的出現。部署時,建議務必刪除下文中我的中文註釋,以防報錯
groups:
- name: hostStatsAlert
rules:
- alert: "memory-warning" #內存告警規則,持續1分鐘大於90%即可告警
expr: ((node_memory_MemTotal_bytes-(node_memory_MemFree_bytes+node_memory_Buffers_bytes+node_memory_Cached_bytes))/node_memory_MemTotal_bytes)*100>90
for: 1m
labels:
severity: warning
annotations:
summary: "{{ $labels.instance }} Server memory usage is over 90%"
description: "{{ $labels.instance }} Server memory usage is over 90%, the current value is: {{ $value }}%"
- alert: "CPU-warning" #CPU告警規則,使用率持續1分鐘大於90%,即可告警
expr: round(100-((avg by (instance,job)(irate(node_cpu_seconds_total{mode="idle",instance!~'bac-.*'}[5m]))) *100))>90
for: 1m
labels:
severity: warning
annotations:
summary: "{{ $labels.instance }} Excessive CPU utilization"
description: "{{ $labels.instance }} Excessive CPU utilization, current utilization is: {{ $value }}%"
- alert: "diskSpace-warning" #磁盤空間告警規則,可用磁盤小於5G持續10秒,即可告警
expr: round(node_filesystem_avail_bytes{fstype=~"ext4|xfs",instance!~"testnode",mountpoint!~"/boot.*"}/1024/1024/1024) < 5
for: 10s
labels:
severity: warning
annotations:
summary: "{{ $labels.instance }} Insufficient disk space"
description: "{{ $labels.instance }} Insufficient disk space, current disk space is: {{$labels.mountpoint}} remaining: {{ $value }}GB"
- alert: "nodeStatus-warning" #節點存活狀態告警規則,1就是正常,0就是掛了,如果持續15秒都是掛的狀態,即可告警
expr: up == 0
for: 15s
labels:
severity: warning
annotations:
summary: "{{ $labels.instance }} Machine survival test"
description: "{{ $labels.instance }} The machine is down, please check!"
- alert: "oracle-warning" #oracle存活狀態告警規則,1就是正常,0就是掛了,如果持續15秒都是掛的狀態,即可告警
expr: probe_success == 0
for: 15s
labels:
severity: warning
annotations:
summary: "{{ $labels.job }} oracle is breakdown"
description: "{{ $labels.job }} oracle is breakdown"
3.3 啓動
nohup /server/prometheus-2.15.2.linux-amd64/prometheus --config.file=/server/prometheus-2.15.2.linux-amd64/prometheus.yml &
說明: 如果需要新增其他的監控,比如rabbit mq、redis等,需要注意的有三點:
1) 到[監控插件下載地址](https://prometheus.io/docs/instrumenting/exporters/ ) 這個地址去下載相關的exporter,大部分都是開箱即用,解壓即可使用,當然也會有需要填寫一些附帶信息的。
2)接着需要修改prometheus.yml,新增一個job_name模塊即可。
3)接着需要修改rules.yml,新增相關的告警指標即可。具體的指標可以訪問prometheus提供的頁面http://172.16.52.37:9090/targets,(就是prometheus的默認提供服務的接口:9090,在那邊可以找到很多參數指標,可自行組合設置)
4)最後重啓prometheus即可,可以直接kill掉原來的,直接重啓即可。
四、安裝Alertmanager
alertmanager是告警模塊,他負責將prometheus的告警信息收集並統一發送出去,裏面可以直接配置釘釘的機器人接口地址,具體方法可以網上搜尋一下,我們是使用web.hook將告警信息發送到指定的web服務裏,將其進行一些處理後在發送給釘釘。
4.1 下載
https://prometheus.io/download/
在上述地址中可以找到alertmanager的下載。下載完後將其解壓,配置基本信息即可配合prometheus使用
4.2 配置
編輯alertmanager.yml
global:
resolve_timeout: 5m
route:
group_by: ['prometheus']
group_wait: 10s
group_interval: 10s
repeat_interval: 10m
receiver: 'web.hook'
receivers:
- name: 'web.hook'
webhook_configs:
- url: 'http://{IP}:8012/api/messages/receive' #web服務接收告警信息地址
http_config:
bearer_token: LhTIaDGXAu1yAeKiAWobgZDo0GMQZR6l #設置這個token,增加相應的安全性,這個token是在header裏
inhibit_rules:
- source_match:
severity: 'critical'
target_match:
severity: 'warning'
equal: ['alertname', 'dev', 'instance']
4.3 啓動
nohup ./alertmanager --config.file=/server/alertmanager-0.20.0.linux-amd64/alertmanager.yml &
五、安裝Grafana
5.1 下載
https://grafana.com/grafana/download
下載Grafana,解壓後直接進入bin目錄,執行下面的命令即可啓動,grafana最麻煩的地方在於配置監控信息
./grafana-server web
5.2 配置
默認端口3000,{部署的服務器ip}:3000 即可訪問頁面。默認的初始用戶名/密碼:admin/admin
第一次登陸會提示修改密碼。修改即可。
進入後,如下圖所示操作即可
5.2.1 配置數據源(prometheus)
保存即可
5.2.2 配置監控面板
導入模板
這裏有技巧,你可以自己寫,但是會很麻煩,費力不討好,自己寫一些模板裏沒有的特定的還是可以的,其他的還是建議直接導入模板
這裏有你想要的各類模板
https://grafana.com/grafana/dashboards?orderBy=name&direction=asc
這裏有已經調試過得兩個模板,新建兩個json文件,將他們的內容保存進去,文件見 七、附件
保存完了之後
點擊這些監控面板即可,可以看到很多監控信息
六、總結
6.1 怎麼知道自己有沒有啓動成功prometheus?
答:
http://{prometheus部署的ip}:9090
直接訪問即可,如果部署成功,會有web頁面的
6.2 需要注意的地方:
6.2.1 防火牆要開幾個特殊的端口
比如這個機子上安裝的各類監控器的監聽端口:9100、9090等等,按需開啓,centos的開啓命令.
如果你沒有開啓,那麼會導致你的監控器無法訪問
firewall-cmd --zone=public --add-port=9090/tcp --permanent
systemctl restart firewalld.service
6.2.2 服務器時間
項目中有碰到過因服務器時間未同步導致的grafana無法獲取信息的問題,所以以上完成後,請檢查一下自己的服務器時間是否已經同步
七、附件
Oracledb監控-性能與表空間-1587890196110.json
{
"annotations": {
"list": [
{
"builtIn": 1,
"datasource": "Prometheus",
"enable": false,
"hide": true,
"iconColor": "rgba(0, 211, 255, 1)",
"limit": 100,
"name": "Annotations & Alerts",
"showIn": 0,
"type": "dashboard"
}
]
},
"description": "使用oracledb-exporter進行oracle數據庫監控,相對其他dashboard增加了tablespace的監控,可拓展設置爲表空間告警;\n\n",
"editable": true,
"gnetId": 11121,
"graphTooltip": 1,
"id": 17,
"iteration": 1587890174657,
"links": [
{
"asDropdown": true,
"icon": "external link",
"tags": [],
"type": "dashboards"
}
],
"panels": [
{
"collapsed": false,
"gridPos": {
"h": 1,
"w": 24,
"x": 0,
"y": 0
},
"id": 67,
"panels": [],
"title": "數據庫",
"type": "row"
},
{
"cacheTimeout": null,
"colorBackground": false,
"colorValue": true,
"colors": [
"rgba(245, 54, 54, 0.9)",
"rgba(237, 129, 40, 0.89)",
"rgba(50, 172, 45, 0.97)"
],
"datasource": "Prometheus",
"decimals": null,
"editable": true,
"error": false,
"format": "none",
"gauge": {
"maxValue": 100,
"minValue": 0,
"show": false,
"thresholdLabels": false,
"thresholdMarkers": true
},
"gridPos": {
"h": 3,
"w": 3,
"x": 0,
"y": 1
},
"height": "125px",
"id": 12,
"interval": "$interval",
"links": [],
"mappingType": 1,
"mappingTypes": [
{
"name": "value to text",
"value": 1
},
{
"name": "range to text",
"value": 2
}
],
"maxDataPoints": 100,
"nullPointMode": "connected",
"nullText": null,
"options": {},
"postfix": "",
"postfixFontSize": "80%",
"prefix": "",
"prefixFontSize": "80%",
"rangeMaps": [
{
"from": "null",
"text": "N/A",
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參考文獻
https://www.ctolib.com/docs/sfile/prometheus-book/quickstart/why-monitor.html
https://www.ibm.com/developerworks/cn/cloud/library/cl-lo-prometheus-getting-started-and-practice/index.html
https://blog.51cto.com/youerning/2050543?from=timeline
https://blog.csdn.net/qq_42606051/article/details/82625163
https://prometheus.io/docs/introduction/faq/