简介
prometheus可以拆分成多个节点进行指标收集。
安装prometheus
wget -c https://github.com/prometheus/prometheus/releases/download/v2.23.0/prometheus-2.23.0.linux-amd64.tar.gz
tar zxvf prometheus-2.23.0.linux-amd64.tar.gz -C /opt/
cd /opt/
ln -s prometheus-2.23.0.linux-amd64 prometheus
cat > /etc/systemd/system/prometheus.service <
[Unit]
Description=prometheus
After=network.target
[Service]
Type=simple
WorkingDirectory=/opt/prometheus
ExecStart=/opt/prometheus/prometheus --config.file="/opt/prometheus/prometheus.yml"
LimitNOFILE=65536
PrivateTmp=true
RestartSec=2
StartLimitInterval=0
Restart=always
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable prometheus
systemctl start prometheus
这里配置的是监听/opt/prometheus/servers/目录下的json文件
cat > /opt/prometheus/prometheus.yml <
# my globalconfig
global:
scrape_interval: 15s # Setthe scrape intervaltoevery 15 seconds.Defaultisevery 1minute.
evaluation_interval: 15s # Evaluate rules every 15 seconds. The defaultisevery 1minute.
# scrape_timeout issettotheglobaldefault(10s).
# Alertmanager configuration
alerting:
alertmanagers:
- static_configs:
- targets:
# - alertmanager:9093
# Loadrules onceandperiodically evaluate them accordingtotheglobal'evaluation_interval'.
rule_files:
# - "first_rules.yml"
# - "second_rules.yml"
# A scrape configuration containing exactly one endpoint toscrape:
# Here it's Prometheus itself.
scrape_configs:
# The job nameisaddedasa label `job=`toanytimeseries scrapedfromthis config.
- job_name: 'prometheus'
# metrics_path defaults to'/metrics'
# scheme defaults to'http'.
static_configs:
- targets: ['localhost:9090']
- job_name: 'servers'
file_sd_configs:
- refresh_interval: 61s
files:
- /opt/prometheus/servers/*.json
EOF
systemctl restart prometheus
json格式
每个json文件需要是一个数组对象，如果不需要自定义标签，可以直接写到targets里面去也可以，可以有多个文件
[
{
"targets": [
"192.168.1.164:9100"
],
"labels": {
"instance":"192.168.1.164",
"job":"node_exporter"
}
},
{
"targets": [
"192.168.1.167:9100"
],
"labels": {
"instance":"192.168.1.167",
"job":"node_exporter"
}
}
]
安装node_exporter
安装到/opt/node_exporter路径下，保持默认的端口
https://github.com/prometheus/node_exporter/releases/download/v1.0.1/node_exporter-1.0.1.linux-amd64.tar.gz
tar zxvf node_exporter-1.0.1.linux-amd64.tar.gz -C /opt/
cd /opt/
ln -s node_exporter-1.0.1.linux-amd64 node_exporter
cat > /etc/systemd/system/node_exporter.service <
[Unit]
Description=node_exporter
After=network.target
[Service]
Type=simple
WorkingDirectory=/opt/node_exporter
ExecStart=/opt/node_exporter/node_exporter
LimitNOFILE=65536
PrivateTmp=true
RestartSec=2
StartLimitInterval=0
Restart=always
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable node_exporter
systemctl start node_exporter
图形展示
直接安装grafana进行展示
yum -y install https://dl.grafana.com/oss/release/grafana-7.3.6-1.x86_64.rpm
systemctl enable grafana-server
systemctl start grafana-server
启动之后，grafana默认监听的是3000端口，直接使用浏览器进行访问就可以了，默认用户名密码是admin/admin，第一次登陆之后会提示修改。
配置数据源：鼠标左边的菜单 Configuration -> Data Source -> Add data source -> 选择prometheus -> url那栏填入prometheus的地址就可以了 -> 最后 Save & test 就可以了。
grafana.com/grafana/dashboards 官网已经有人做好的模板，我们直接import进来就可以了。
导入面板：鼠标左边的菜单 Dashboards -> Import -> 填入id -> Load -> 选择数据源就可以了。
我经常用的是：1860 、8919 这两个来查看node_exporter监控
总结
安装这些服务都是使用systemd进行管理的，操作起来比较方便的。
这里没有设置告警，可以根据自己的需要设置对应的告警规则，使用alertmanager进行告警。
