node-exporter（被监控节点）搭建

PS：时区和时间的一致性

1、创建/data/apps目录，并且下载 node_exporter-1.4.0.linux-amd64.tar.gz

mkdir -p /data/apps
​
cd /data/apps
​
wget https://github.com/prometheus/node_exporter/releases/download/v1.4.0/node_exporter-1.4.0.linux-amd64.tar.gz
或
wget https://githubfast.com/prometheus/node_exporter/releases/download/v1.4.0/node_exporter-1.4.0.linux-amd64.tar.gz
​

2、解压压缩包到/usr/local，并且重创建软链接

tar -zxvf node_exporter-1.4.0.linux-amd64.tar.gz -C /usr/local
​
cd /usr/local
​
ln -s node_exporter-1.4.0.linux-amd64 node_exporter

3、使用systemctl管理node_exporter

vi /usr/lib/systemd/system/node_exporter.service
​
[Unit]
Description=node_exporter
Documentation=https://prometheus.io/
After=network.target
​
[Service]
Type=simple
User=root
ExecStart=/usr/local/node_exporter/node_exporter
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
​
[Install]
WantedBy=multi-user.target
​

4、设置开机自启并且开启node_exporter服务,最后查看服务状态

systemctl enable node_exporter && systemctl start node_exporter && systemctl status node_exporter
​
setenforce 0
​
iptables放通tcp的9100端口

iptables -I INPUT -p tcp --dport 9100 -j ACCEPT

iptables-save​

5、在prometheus服务器的prometheus.yml文件追加node节点监控

vi /usr/local/prometheus/prometheus.yml
​
  - job_name: "node1"
    static_configs:
      - targets: ['被监控设备的IP:9100']
      
或者以file_sd_configs方式追加node

vi /usr/local/prometheus/prometheus.yml

  - job_name: "node1"
    file_sd_configs:
      - files:
        - /usr/local/prometheus/target/node1.yml
​
mkdir /usr/local/prometheus/target

cd /usr/local/prometheus/target

vi node1.yml 
- targets:
  - "被监控设备的IP:9100"
​

6、检查prometheus.yml格式

cd /usr/local/prometheus/

./promtool check config prometheus.yml
​

7、热加载prometheus配置

curl  -X POST http://127.0.0.1:9090/-/reload
​

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脚本方式部署node-exporter

~node-exporter节点上（被监控节点）

vi node-exporter.sh
​
#!/bin/bash
​
setenforce 0 &&
iptables -I INPUT -p tcp --dport 9100 -j ACCEPT &&
iptables-save &&
mkdir -p /data/apps > /dev/null &&
cd /data/apps &&
wget https://githubfast.com/prometheus/node_exporter/releases/download/v1.4.0/node_exporter-1.4.0.linux-amd64.tar.gz > /dev/null &&
echo "下载node-exporters压缩包完成" &&
tar -zxvf node_exporter-1.4.0.linux-amd64.tar.gz -C /usr/local > /dev/null &&
cd /usr/local &&
ln -s node_exporter-1.4.0.linux-amd64 node_exporter &&
echo "[Unit]
Description=node_exporter
Documentation=https://prometheus.io/
After=network.target
​
[Service]
Type=simple
User=root
ExecStart=/usr/local/node_exporter/node_exporter
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
​
[Install]
WantedBy=multi-user.target" | tee -i /usr/lib/systemd/system/node_exporter.service > /dev/null &&
systemctl enable node_exporter && 
systemctl start node_exporter && 
systemctl status node_exporter 
​
​sh ./node-exporter.sh

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卸载node-exporter部署

vi node-exporter_uninstall.sh

#!/bin/bash

systemctl disable node_exporter && 
systemctl stop node_exporter && 
rm -rf /usr/lib/systemd/system/node_exporter.service &&
setenforce 1 &&
iptables -D INPUT -p tcp --dport 9100 -j ACCEPT &&
iptables-save > /dev/null  &&
cd /usr/local &&
unlink node_exporter &&
rm -rf node_exporter-1.4.0.linux-amd64 &&
rm -rf /data/apps/node_exporter-1.4.0.linux-amd64.tar.gz > /dev/null &&
echo "删除node_exporter完成" 



sh ./node-exporter_uninstall.sh
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~prometheus节点上

vi node_join.sh

#!/bin/bash

#对应被监控的node名称
NODENAME=$1
#对应被监控的IP地址
IPADDRESS=$2
echo "
  - job_name: "$NODENAME"
    static_configs:
      - targets: ["$IPADDRESS:9100"]
    " | tee -a /usr/local/prometheus/prometheus.yml > /dev/null &&
/usr/local/prometheus/promtool check config /usr/local/prometheus/prometheus.yml &&
curl  -X POST http://127.0.0.1:9090/-/reload

sh ./node_join.sh NODENAME(对应被监控的node名称) IPADDRESS(对应被监控的IP地址)

自定义监控
在/usr/lib/systemd/system/node_exporter.service文件中的ExecStart项添加--collector.textfile.directory参数，监控的文件以.prom结尾

[Unit]
Description=node_exporter
Documentation=https://prometheus.io/
After=network.target

[Service]
Type=simple
User=root
ExecStart=/usr/local/node_exporter/node_exporter \ --collector.textfile.directory=/var/lib/node_exporter
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure

[Install]
WantedBy=multi-user.target

cat /var/lib/node_exporter/test.prom 
# HELP messages_log_test /var/log/messages test.
# TYPE messages_log_test counter
messages_log_test{topic="Aug 16 09:08:23 test-node kernel: cloudprovider invoked test: gfp_mask=0x135chb, order=0, test=996"} 1