Docker堆栈部署（撰写）中可以使用哪些Docker模板值？ [英] Which Docker template values are available in docker stack deploy (compose)?

问题描述

在哪里可以找到我的Docker UCP Swarm集群中可用的模板值？

Where can I find out which template values are available in my Docker UCP Swarm cluster?

使用 template 值，我的意思是这样的 https://docs.docker.com/engine / reference / commandline / service_create /＃create-services-using-templates 。

With template values I mean things like this https://docs.docker.com/engine/reference/commandline/service_create/#create-services-using-templates.

我感觉到我正在遍历的树看起来有点像 docker inspect 输出，但输出较小。哪个键？以及我可以使用哪些表达式？

I get the feeling that the tree I'm traversing looks a bit like docker inspect output, but a smaller set of it. Which keys? and which expressions can I use?

除此之外，我经常会遇到诸如 {{。Engine.Labels}}

Besides that, I often get errors like for {{.Engine.Labels}}

<.Engine.Labels>: can't evaluate field Engine in type *template.Context

因此，似乎存储树的上下文是 Context。据我所知，这不是码头工人的概念。

So, it seems the context in which the tree is stored is 'Context'. Which is not a docker concept as far as I know.

我尝试使用此方法的示例：

An example of how I'm trying to use this:

version: "3.7"

services:
  bar:
    image: foo/bar:latest
    environment:
      - hostname={{.Node.Hostname}}
    deploy:
      replicas: 2

在 docker inspect 中还有一个-format 标志，您可以在其中使用相同的go-template语法，但不是可在docker堆栈设置中使用的树。

In docker inspect there is also a --format flag where you can use the same go-template syntax, but it is not the tree that can be used in the docker stack setup.

推荐答案

I 相信，其中的 context.go swarmkit仓库负责。

I believe that context.go in the swarmkit repo is responsible.

这意味着您具有以下条件：

This means you have the following:

    Service struct {
        ID     string
        Name   string
        Labels map[string]string
    }

    Node struct {
        ID       string
        Hostname string
        Platform Platform
    }

    Task struct {
        ID   string
        Name string
        Slot string
    }

例如 .Service.ID ， .Service.Labels.LabelNameGoesHere ， .Task.Name 等。

我希望可以为docker-compose.yml模板暴露和访问Node标签，但是可惜没有。

I was hoping that the Node labels would be exposed and accessible for the templating the docker-compose.yml, but alas not.

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