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# prometheus
mkdir -m=777 -p /data/{download,app_logs,app/prometheus}
cd /data/download
wget https://github.com/prometheus/prometheus/releases/download/v2.45.0-rc.0/prometheus-2.45.0-rc.0.linux-amd64.tar.gz
tar xvfz prometheus-*.tar.gz
ln -s /data/download/prometheus-2.45.0-rc.0.linux-amd64/prometheus /usr/bin/prometheus
cp /data/download/prometheus-2.45.0-rc.0.linux-amd64/prometheus.yml /data/app/prometheus/prometheus.yml 
prometheus --config.file=/data/app/prometheus/prometheus.yml --web.listen-address=:9090 --web.enable-lifecycle --storage.tsdb.path=/data/app/prometheus/data >>/data/app_logs/prometheus.log 2>&1 &

# node_exporter 在需要监控的服务器里安装
mkdir -m=777 -p /data/{download,app_logs,app/prometheus}
cd /data/download
wget https://github.com/prometheus/node_exporter/releases/download/v1.6.0/node_exporter-1.6.0.linux-amd64.tar.gz
tar xvfz node_exporter*
ln -s /data/download/node_exporter-1.6.0.linux-amd64/node_exporter /usr/bin/node_exporter
# 启动node_exporter,服务器暴露的端口是8080，同时服务器里有其他服务占用了8080端口，可以使用nginx将node_exporter获取指标的api暴露出去
# location /metrics {
#     proxy_pass http://127.0.0.1:9000/metrics;
# }
node_exporter --web.listen-address 127.0.0.1:9000 >>/data/app_logs/node_exporter.log 2>&1 &
# 添加node_exporter之后，需要更新prometheus.xml添加targets，然后运行：curl -X PUT http://server_address:port/-/reload重新加载配置文件

# alert_manager可以和prometheus安装到同一台服务器
cd /data/download
wget https://github.com/prometheus/alertmanager/releases/download/v0.25.0/alertmanager-0.25.0.linux-amd64.tar.gz
tar xvfz alertmanager*
ln -s /data/download/alertmanager-0.25.0.linux-amd64/alertmanager /usr/bin/alertmanager
cp /data/download/alertmanager-0.25.0.linux-amd64/alertmanager.yml /data/app/prometheus/alertmanager.yml
alertmanager --config.file=/data/app/prometheus/alertmanager.yml --web.listen-address 127.0.0.1:9001 >>/data/app_logs/node_exporter.log 2>&1 &
# 将alert_manager的地址添加到prometheus.yml里的alertmanagers的targets里，然后运行：curl -X PUT http://server_address:port/-/reload重新加载配置文件

测试报警邮件功能：设置如果安装exporter的服务器内存占用率超过50%或者tcp timewait超过10的时候就发邮件（在实际工作中需要设置一个合适的条件）：

prometheus.yml里添加rule_files的路径：

# my global config
global:
  scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  eva luation_interval: 15s # eva luate 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:
          - 127.0.0.1:9001

# Load rules once and periodically eva luate them according to the global 'eva luation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"
  - "/data/app/prometheus/alert.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'.
    scrape_interval: 5s

    static_co