prometheus安装

1、下载安装包并解压到相关目录

#创建prometheus用户
useradd prometheus
cd /home/prometheus
wget https://github.com/prometheus/prometheus/releases/download/v2.26.0/prometheus-2.26.0.linux-amd64.tar.gztar -xf prometheus-2.26.0.linux-amd64.tar.gz -C /home/prometheus/
cd /home/prometheus
mv prometheus-2.26.0.linux-amd64 prometheus

2、使用systemd接管prometheus
–web.enable-lifecycle这个参数要配置上，可以使用curl直接重载配置文件而不用重启服务

重载配置两种方法
# 第一种，向prometheus进行发信号
kill -HUP  pid# 第二种，向prometheus发送HTTP请求
# /-/reload只接收POST请求，并且需要在启动prometheus进程时，指定 --web.enable-lifecycle
curl -XPOST http://localhost:9090/-/reload

cat <<EOF > /usr/lib/systemd/system/prometheus.service
[Unit]
Description=Prometheus
Wants=network-online.target
After=network-online.target[Service]
User=prometheus
Type=simple
ExecStart=/home/prometheus/prometheus/prometheus \--config.file=/home/prometheus/prometheus/prometheus.yml \--web.enable-lifecycle
#    --storage.tsdb.path /var/lib/prometheus/ \
#    --web.console.templates=/etc/prometheus/consoles \
#    --web.console.libraries=/etc/prometheus/console_libraries \
#    --web.listen-address=:9090
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF

prometheus.yml

cat <<EOF > /home/prometheus/prometheus/prometheus.yml
# my global config
global:scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.# scrape_timeout is set to the global default (10s).# Alertmanager configuration
alerting:alertmanagers:- static_configs:- targets:# - alertmanager:9093# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:# - "first_rules.yml"# - "second_rules.yml"# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:# The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.- job_name: 'prometheus'# metrics_path defaults to '/metrics'# scheme defaults to 'http'.static_configs:- targets: ['localhost:9090']- job_name: "gitlab-runner"static_configs:- targets: ['172.16.14.127:9100']
EOF

systemctl start prometheus
netstat -tunlp|grep 9090

访问
http://ip:9090/

按照上面的步骤会遇到的问题
使用prometheus用户的service时，启动时会报错
jenkins prometheus: level=error ts=2021-11-01T12:15:36.698Z caller=query_logger.go:87 component=activeQueryTracker msg=“Error opening query log file” file=data/queries.active err=“open data/queries.active: permission denied”

原因是prometheus启动时，会创建/data目录，但是启动时用的是prometheus用户，权限不够，方法，先用root用户创建/data目录，再使用chown prometheus:prometheus /data即可

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prometheus.yml

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