Prometheus

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Prometheus是一個TSDB

概要

Prometheus本身是一個TSDB(Time series database),會主動到目標機器上蒐集資料後寫入資料庫,另外Prometheus可以設定警示條件送進Alertmanager,由Alertmanager送到外部服務通知(像是Slack,或是PagerDuty)。

安裝

Ubuntu 20.04系統內的Prometheus太舊(2.15),加上沒有適合的PPA可以用,這邊使用官方的binary安裝:

export PROMETHEUS_VERSION=2.30.3; cd /tmp; wget https://github.com/prometheus/prometheus/releases/download/v${PROMETHEUS_VERSION}/prometheus-${PROMETHEUS_VERSION}.linux-amd64.tar.gz; tar xvf prometheus-${PROMETHEUS_VERSION}.linux-amd64.tar.gz; cd prometheus-${PROMETHEUS_VERSION}.linux-amd64; sudo cp -f prometheus promtool /usr/bin; sudo mkdir /etc/prometheus; sudo cp prometheus.yml /etc/prometheus/; sudo cp -R consoles/ console_libraries/ /etc/prometheus/; sudo useradd -r -U prometheus; sudo mkdir /var/lib/prometheus; sudo chown prometheus:prometheus /var/lib/prometheus; echo -e "[Unit]\nDescription=Prometheus Time Series Collection and Processing Server\nWants=network-online.target\nAfter=network-online.target\n\n[Service]\nUser=prometheus\nGroup=prometheus\nType=simple\nExecStart=/usr/bin/prometheus --config.file /etc/prometheus/prometheus.yml --storage.tsdb.path /var/lib/prometheus/ --web.console.templates=/etc/prometheus/consoles --web.console.libraries=/etc/prometheus/console_libraries\n\n[Install]\nWantedBy=multi-user.target" | sudo tee /lib/systemd/system/prometheus.service; sudo systemctl daemon-reload; sudo systemctl enable prometheus; sudo service prometheus start

另外一起裝Alertmanager:

export ALERTMANAGER_VERSION=0.23.0; cd /tmp; wget https://github.com/prometheus/alertmanager/releases/download/v${ALERTMANAGER_VERSION}/alertmanager-${ALERTMANAGER_VERSION}.linux-amd64.tar.gz; tar xvf alertmanager-${ALERTMANAGER_VERSION}.linux-amd64.tar.gz; cd alertmanager-${ALERTMANAGER_VERSION}.linux-amd64; sudo cp -f alertmanager amtool /usr/bin; sudo mkdir /etc/amtool /var/lib/alertmanager; sudo chown prometheus:prometheus /var/lib/alertmanager; sudo cp alertmanager.yml /etc/amtool; echo -e "[Unit]\nDescription=Prometheus Alertmanager\nWants=network-online.target\nAfter=network-online.target\n\n[Service]\nUser=prometheus\nGroup=prometheus\nType=simple\nExecStart=/usr/bin/alertmanager --config.file /etc/amtool/alertmanager.yml --storage.path /var/lib/alertmanager\n\n[Install]\nWantedBy=multi-user.target" | sudo tee /lib/systemd/system/alertmanager.service; sudo systemctl daemon-reload; sudo systemctl enable alertmanager; sudo service alertmanager start

設定

要注意官方安裝檔內的prometheus.ymlscrape_intervalevaluation_interval預設是15s(但不設定時預設是1m),正常情況下5m應該是夠用,可以考慮指定5m降低頻率。

外部連結