process-exporter主要用来做进程监控，比如某个服务的进程数、消耗了多少CPU、内存、IO资源等。
1、process-exporter，可从github中搜索下载，process-exporter非官方出品，但能基本满足我们对进程监控的需求。
# wget https://github.com/ncabatoff/process-exporter/releases/download/v0.7.2/process-exporter-0.7.2.linux-amd64.tar.gz
# tar -xvf process-exporter-0.7.2.linux-amd64.tar.gz -C /usr/local/
# cd /usr/local/
# ln -s process-exporter-0.7.2.linux-amd64 process_exporter
# cd process_exporter
# ln -s process-exporter process_exporter
注：修改目录名，统一风格
2、创建配置文件，并添加要监控的进程
# cat /usr/local/process_exporter/config.yaml
process_names:
- name: "{{.Matches}}"
cmdline:
- '/usr/local/prometheus/prometheus'
- name: "{{.Matches}}"
cmdline:
- '/usr/local/alertmanager/alertmanager'
- name: "{{.Matches}}"
cmdline:
- '/usr/local/node_exporter/node_exporter'
- name: "{{.Matches}}"
cmdline:
- '/usr/bin/supervisord -c /etc/supervisord.conf'
3、使用systemd方式启动process_exporter
# cat > /lib/systemd/system/process_exporter.service <<EOF
[Unit]
Description=process-exporter
[Service]
ExecStart=/usr/local/process_exporter/process_exporter -config.path=/usr/local/process_exporter/config.yaml
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
启动process_exporter服务，并设置开机自启动
# systemctl daemon-reload
# systemctl enable process_exporter
# systemctl start process_exporter
默认端口：9256
4、将process_exporter做为target添加到prometheus中并加载配置
# vim /usr/local/prometheus/prometheus.yml
- job_name: 'process_exporter'
static_configs:
- targets: ['monitor01:9256']
labels:
app: process_exporter
nodename: monitor01
role: process_exporter
然后使用supervisorctl命令update下配置即可
# supervisorctl -uadmin -p1235 update
5、在prometheus控制台进行查询验证。
namedprocess_namegroup_num_procs，用于进程数监控
例如：namedprocess_namegroup_num_procs{groupname=~".*prometheus.*"}
namedprocess_namegroup_cpu_seconds_total，进程所占CPU监控，包括system和user两类
例如：sum(rate(namedprocess_namegroup_cpu_seconds_total{groupname=~".*prometheus.*"}[2m]))
namedprocess_namegroup_memory_bytes，进程所常驻内存监控
例如：namedprocess_namegroup_memory_bytes{groupname=~".*prometheus.*", memtype="resident"}
namedprocess_namegroup_read_bytes_total，进程磁盘读
例如：rate(namedprocess_namegroup_read_bytes_total{groupname=~".*prometheus.*"}[2m])
namedprocess_namegroup_write_bytes_total，进程磁盘写
rate(namedprocess_namegroup_write_bytes_total{groupname=~".*prometheus.*"}[2m])
最后以进程数查询结果如下图所示：
使用Grafana展示效果
