使用 Terraform 和 Kubernetes 部署时如何修改 Docker 容器中的文件? [英] How to modify a file in a Docker container when deploying with Terraform and Kubernetes?

问题描述

作为更大模块的一部分，我想部署一个 nginx 容器并替换其默认的 nginx.conf.新配置应使用部署时生成的 Terraform resources 数据构建.有办法吗?

As a part of a bigger module, I want to deploy an nginx container and replace its default nginx.conf. The new config should be built using Terraform resources' data which is generated at the time of deployment. Is there a way to do it?

推荐答案

我设法按照以下步骤将标准的 nginx.conf 替换为动态生成的:

I managed to replace the standard nginx.conf with a dynamically generated one following these steps:

1. 为动态数据创建一个带有占位符的模板配置文件
2. 使用 Terraform 的 template_file 数据源
解析文件
3. 将解析后的数据存储在 ConfigMap 中，并将映射挂载为 Nginx 容器的卷

一步一步:

创建名为nginx-conf.tpl的nginx.conf模板:

Create nginx.conf template named nginx-conf.tpl:

events {
  worker_connections  4096;  ## Default: 1024
}
http {
  server {
    listen 80;
    listen [::]:80;

    server_name ${server_name};

    location /_plugin/kibana {
        proxy_pass https://${elasticsearch_kibana_endpoint};
    }
    location / {
        proxy_pass https://${elasticsearch_endpoint};
    }
  }
}

使用以下 Terraform 代码解析 nginx-conf.tpl 模板:

Parse the nginx-conf.tpl template with the following Terraform code:

data "template_file" "nginx" {
  template = "${file("${path.module}/nginx-conf.tpl")}"
  vars = {
    elasticsearch_endpoint        = "${aws_elasticsearch_domain.example-name.endpoint}"
    elasticsearch_kibana_endpoint = "${aws_elasticsearch_domain.example-name.kibana_endpoint}"
    server_name                   = "${var.server_name}"
  }
}

创建一个 ConfigMap 并使用 nginx.conf 键将解析后的模板存储在那里:

Create a ConfigMap and store the parsed template there with nginx.conf key:

resource "kubernetes_config_map" "nginx" {
  metadata {
    name = "nginx"
  }
  data = {
    "nginx.conf" = data.template_file.nginx.rendered
  }
}

最后，将 ConfigMap 键挂载为容器卷:

Finally, mount the ConfigMap key as a container volume:

# ...
spec {
  # ...
  container {
    # ...
    volume_mount {
      name       = "nginx-conf"
      mount_path = "/etc/nginx"
    }
  }
  volume {
    name = "nginx-conf"
    config_map {
      name = "nginx"
      items {
        key  = "nginx.conf"
        path = "nginx.conf"
      }
    }
  }
}
# ...

就是这样.Nginx 服务器将开始使用提供的配置.

That's it. Nginx server will start using the provided config.

有用的链接:Kubernetes ConfigMap as volume, Terraform Temple_file 数据源文档.

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