# Deployments Concepts

When deploying a **FastAPI** application, or actually, any type of web API, there are several concepts that you probably care about, and using them you can find the **most appropriate** way to **deploy your application**.

Some of the important concepts are:

* Security - HTTPS
* Running on startup
* Restarts
* Replication (the number of processes running)
* Memory
* Previous steps before starting

* **同一程序**可以有**多个进程**同时运行。

如果您检查操作系统中的“任务管理器”或“系统监视器”（或类似工具），您将能够看到许多正在运行的进程。

例如，您可能会看到有多个进程运行同一个浏览器程序（Firefox、Chrome、Edge 等）。 他们通常每个tab运行一个进程，再加上一些其他额外的进程。

<img class="shadow" src="/img/deployment/concepts/image01.png">

---

现在我们知道了术语“进程”和“程序”之间的区别，让我们继续讨论部署。

## 启动时运行

在大多数情况下，当您创建 Web API 时，您希望它**始终运行**、不间断，以便您的客户端始终可以访问它。 这是当然的，除非您有特定原因希望它仅在某些情况下运行，但大多数时候您希望它不断运行并且**可用**。

### 在远程服务器中

🚥 👆 ✅ 👅 "📋 👨‍💼" ⚖️ "⚙️ 🖥" (⚖️ 🎏 🧰) 👆 🏃‍♂ ⚙️, 👆 🔜 💪 👀 📚 👈 🛠️ 🏃‍♂.

& , 🖼, 👆 🔜 🎲 👀 👈 📤 💗 🛠️ 🏃 🎏 🖥 📋 (🦎, 💄, 📐, ♒️). 👫 🛎 🏃 1️⃣ 🛠️ 📍 📑, ➕ 🎏 ➕ 🛠️.

<img class="shadow" src="/img/deployment/concepts/image01.png">

---

🔜 👈 👥 💭 🔺 🖖 ⚖ **🛠️** &amp; **📋**, ➡️ 😣 💬 🔃 🛠️.

## 🏃‍♂ 🔛 🕴

<img class="shadow" src="/img/deployment/concepts/image01.png">

---

Теперь, когда нам известна разница между **процессом** и **программой**, давайте продолжим обсуждение развёртывания.

## Настройки запуска приложения

OSの「タスク・マネージャー」や「システム・モニター」（または同様のツール）を確認すれば、これらのプロセスの多くが実行されているの見ることができるでしょう。

例えば、同じブラウザプログラム（Firefox、Chrome、Edgeなど）を実行しているプロセスが複数あることがわかります。通常、1つのタブにつき1つのプロセスが実行され、さらに他のプロセスも実行されます。

<img class="shadow" src="/img/deployment/concepts/image01.png">

---

さて、**プロセス**と**プログラム**という用語の違いを確認したところで、デプロイメントについて話を続けます。

## 起動時の実行

As you saw in the previous chapter about [Deployment Concepts](concepts.md){.internal-link target=_blank}, there are multiple strategies you can use.

Here I'll show you how to use <a href="https://gunicorn.org/" class="external-link" target="_blank">**Gunicorn**</a> with **Uvicorn worker processes**.

!!! info

## Deployment Concepts

Let's talk again about some of the same [Deployment Concepts](concepts.md){.internal-link target=_blank} in terms of containers.

Containers are mainly a tool to simplify the process of **building and deploying** an application, but they don't enforce a particular approach to handle these **deployment concepts**, and there are several possible strategies.

```Python hl_lines="1  7-12  19-20"
{!../../../docs_src/dataclasses/tutorial001.py!}
```

This is still supported thanks to **Pydantic**, as it has <a href="https://docs.pydantic.dev/latest/concepts/dataclasses/#use-of-stdlib-dataclasses-with-basemodel" class="external-link" target="_blank">internal support for `dataclasses`</a>.

    # An empty value means it is a vanilla Kubernetes distribution, therefore no special
    # treatment will be considered.
    platform: ""

    # Setup how istiod Service is configured. See https://kubernetes.io/docs/concepts/services-networking/dual-stack/#services
    # This is intended only for use with external istiod.
    ipFamilyPolicy: ""
    ipFamilies: []

  base:
    # Used for helm2 to add the CRDs to templates.

## Update strategy for StatefulSets
statefulSetUpdate:
  updateStrategy: RollingUpdate

## Pod priority settings
## ref: https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/
##
priorityClassName: ""

## Pod runtime class name
## ref https://kubernetes.io/docs/concepts/containers/runtime-class/
##
runtimeClassName: ""

## Set default rootUser, rootPassword
## rootUser and rootPassword is generated when not set