consul_template: https://www.hi-linux.com/posts/36431.html

1、下载安装包 并解压consul 得到consul二进制文件

https://releases.hashicorp.com/consul/1.3.1/consul_1.3.1_linux_amd64.zip 

mkdir /application &&  mv consul /application

2、启动脚本启动consul_server 

#!/bin/bash
bin_path=/application/
data_path="$bin_path"/data
nodename=`hostname`
idc=dc1
bindip=`/sbin/ifconfig eth0 |grep '\binet \b' |sed -nr 's#[^0-9]*([0-9.]*).*#\1#gp'`
bootstrap_expect=1
$bin_path/consul agent  -server \
                        -bind=$bindip \
                        -ui \
   -client=0.0.0.0 \
                        -bootstrap-expect=$bootstrap_expect \
                        -data-dir $data_path \
                        -node $nodename \
                        -datacenter=$idc \
                        -log-level=warn \
                        -pid-file=$bin_path/consul.pid

3、consul配合consul_template自动修改prometheus配置

参考博客：https://www.hi-linux.com/posts/36431.html

1、consul指定添加单个key

./consul kv put prometheus/kubernetes-apiserver/address 10.0.0.31

2、consul指定获取单个key

./consul kv get prometheus/kubernetes-apiserver/address

3、consul指定删除单个key

./consul kv delete prometheus/kubernetes-apiserver/address


4、consul_template安装

$ wget https://releases.hashicorp.com/consul-template/0.18.3/consul-template_0.18.3_linux_amd64.zip
$ unzip consul-template_0.18.3_linux_amd64.zip
$ mv consul-template /usr/local/bin/


5、prometheus配置文件来设置tcp端口检测机制：

- job_name: "tcp_port_discorvery"
  scrape_interval: 5s
  metrics_path: /probe
  params:
    module: [tcp_connect]
  file_sd_configs:
    - files:
  - /home/work/software/prometheus/tcp_port.json
  relabel_configs:
    - source_labels: [__address__]
  target_label: __param_target
- source_labels: [__param_target]
  target_label: instance
- target_label: __address__
  replacement: xxx.xx.xx.xx:31659

配置consul_template模板来进行配置渲染

vim /prometheus/template.json
[{{ range tree "prometheus/linux" }}
{
"targets": ["{{ .Value }}"],
"labels": {
"process_name": "{{ .Key }}"
}
},
{{ end }}
{
"targets": ["xxx.xx.xx.xx:80"],
"labels": {
"process_name": "tengine"
}
}
]



vim /application/prometheus.ops
consul {
address = "xxx.xx.xx.xx:8500"
}
template {
source = "/prometheus/template.json"
destination = "/home/work/software/prometheus/tcp_port.json"
command = "curl -X POST http://127.0.0.1:9090/-/reload"
}


测试模板生成文件 看到文件内容为空

consul-template  -consul-addr xxx.xxx.xx.xx:8500 -template="complate.json:result" -once -dry

将要获取的key推到consul中注册

./consul kv put prometheus/tcp_port/k8smaster-apiserver 1xx.xx.xx.xx:6443


测试无误后启动consul-template

consul-template -config "/application/prometheus.ops" &

也可以添加到systemctl服务管理程序设置开机自启动