Update docs

- Remove Ubuntu 16.04, whose standard support will end on April 30,
  2021
- Add a note on CentOS Linux 8

README-zh.md

@@ -82,9 +82,9 @@ wget https://git.io/vpnsetup-amzn -O vpn.sh && sudo sh vpn.sh && sudo bash /opt/
 ## 系统要求
 
 一个新创建的 <a href="https://aws.amazon.com/ec2/" target="_blank">Amazon EC2</a> 实例，使用这些映像之一：
-- <a href="https://cloud-images.ubuntu.com/locator/" target="_blank">Ubuntu 20.04 (Focal), 18.04 (Bionic) 或者 16.04 (Xenial)</a>
+- <a href="https://cloud-images.ubuntu.com/locator/" target="_blank">Ubuntu 20.04 (Focal) 或者 18.04 (Bionic)</a>
 - <a href="https://wiki.debian.org/Cloud/AmazonEC2Image" target="_blank">Debian 10 (Buster)</a>[\*](#debian-10-note)<a href="https://wiki.debian.org/Cloud/AmazonEC2Image" target="_blank"> 或者 9 (Stretch)</a>
-- <a href="https://wiki.centos.org/Cloud/AWS" target="_blank">CentOS 8 或者 7</a>
+- <a href="https://wiki.centos.org/Cloud/AWS" target="_blank">CentOS 8</a>[\*\*](#centos-8-note)<a href="https://wiki.centos.org/Cloud/AWS" target="_blank"> 或者 7</a>
 - <a href="https://aws.amazon.com/partners/redhat/faqs/" target="_blank">Red Hat Enterprise Linux (RHEL) 8 或者 7</a>
 - <a href="https://aws.amazon.com/amazon-linux-2/" target="_blank">Amazon Linux 2</a>
 
@@ -104,6 +104,8 @@ wget https://git.io/vpnsetup-amzn -O vpn.sh && sudo sh vpn.sh && sudo bash /opt/
 
 <a name="debian-10-note"></a>
 \* Debian 10 用户需要使用标准的 Linux 内核（而不是 "cloud" 版本）。更多信息请看 <a href="docs/clients-zh.md#debian-10-内核" target="_blank">这里</a>。如果你在 EC2 上使用 Debian 10，你必须首先换用标准的 Linux 内核，然后运行 VPN 安装脚本。   
+<a name="centos-8-note"></a>
+\*\* CentOS Linux 8 的支持将于2021年12月31日结束。更多信息请看 <a href="https://wiki.centos.org/About/Product" target="_blank">这里</a>。   
 
 :warning: **不要** 在你的 PC 或者 Mac 上运行这些脚本！它们只能用在服务器上！
 

README.md

@@ -82,9 +82,9 @@ For other installation options and how to set up VPN clients, read the sections
 ## Requirements
 
 A newly created <a href="https://aws.amazon.com/ec2/" target="_blank">Amazon EC2</a> instance, from one of these images:
-- <a href="https://cloud-images.ubuntu.com/locator/" target="_blank">Ubuntu 20.04 (Focal), 18.04 (Bionic) or 16.04 (Xenial)</a>
+- <a href="https://cloud-images.ubuntu.com/locator/" target="_blank">Ubuntu 20.04 (Focal) or 18.04 (Bionic)</a>
 - <a href="https://wiki.debian.org/Cloud/AmazonEC2Image" target="_blank">Debian 10 (Buster)</a>[\*](#debian-10-note)<a href="https://wiki.debian.org/Cloud/AmazonEC2Image" target="_blank"> or 9 (Stretch)</a>
-- <a href="https://wiki.centos.org/Cloud/AWS" target="_blank">CentOS 8 or 7</a>
+- <a href="https://wiki.centos.org/Cloud/AWS" target="_blank">CentOS 8</a>[\*\*](#centos-8-note)<a href="https://wiki.centos.org/Cloud/AWS" target="_blank"> or 7</a>
 - <a href="https://aws.amazon.com/partners/redhat/faqs/" target="_blank">Red Hat Enterprise Linux (RHEL) 8 or 7</a>
 - <a href="https://aws.amazon.com/amazon-linux-2/" target="_blank">Amazon Linux 2</a>
 
@@ -104,6 +104,8 @@ Advanced users can set up the VPN server on a $35 <a href="https://www.raspberry
 
 <a name="debian-10-note"></a>
 \* Debian 10 users should use the standard Linux kernel (not the "cloud" version). Read more <a href="docs/clients.md#debian-10-kernel" target="_blank">here</a>. If using Debian 10 on EC2, you must first switch to the standard Linux kernel before running the VPN setup script.   
+<a name="centos-8-note"></a>
+\*\* Support for CentOS Linux 8 will end on December 31, 2021. Read more <a href="https://wiki.centos.org/About/Product" target="_blank">here</a>.   
 
 :warning: **DO NOT** run these scripts on your PC or Mac! They should only be used on a server!
 

aws/README-zh.md

@@ -8,7 +8,7 @@
 
 - Amazon EC2 实例类型
 > **注：** 在某些 AWS 区域中，此模版提供的某些实例类型可能不可用。比如 `m5a.large` 可能无法在 `ap-east-1` 区域部署（仅为假设）。在此情况下，你会在部署过程中遇到此错误：`The requested configuration is currently not supported. Please check the documentation for supported configurations`。新开放的 AWS 区域更容易出现此问题，因为它们提供的实例类型较少。如需了解更多关于实例可用性的信息，请参见 [https://ec2instances.info](https://ec2instances.info)。
-- VPN 服务器的操作系统（Ubuntu 20.04/18.04/16.04, Debian 9, CentOS 8/7, Amazon Linux 2）
+- VPN 服务器的操作系统（Ubuntu 20.04/18.04, Debian 9, CentOS 8/7, Amazon Linux 2）
 > **注：** 在 EC2 上使用 Debian 9 映像之前，你需要先在 AWS Marketplace 上订阅：[Debian 9](https://aws.amazon.com/marketplace/pp/B073HW9SP3)。
 - 你的 VPN 用户名
 - 你的 VPN 密码

aws/README.md

@@ -8,7 +8,7 @@ Available customization parameters:
 
 - Amazon EC2 instance type
 > **Note**: It is possible that not all instance type options offered by this template are available in a specific AWS region. For example, you may not be able to deploy an `m5a.large` instance in `ap-east-1` (hypothetically). In that case, you might experience the following error during deployment: `The requested configuration is currently not supported. Please check the documentation for supported configurations`. Newly released regions are more prone to having this problem as there are less variety of instances. For more info about instance type availability, refer to [https://ec2instances.info](https://ec2instances.info).
-- OS for your VPN server (Ubuntu 20.04/18.04/16.04, Debian 9, CentOS 8/7, Amazon Linux 2)
+- OS for your VPN server (Ubuntu 20.04/18.04, Debian 9, CentOS 8/7, Amazon Linux 2)
 > **Note:** Before using the Debian 9 image on EC2, you need to first subscribe at the AWS Marketplace: [Debian 9](https://aws.amazon.com/marketplace/pp/B073HW9SP3).
 - Your VPN username
 - Your VPN password

azure/README-zh.md

@@ -9,7 +9,7 @@
  - Username for VPN **and** SSH （用户名）
  - Password for VPN **and** SSH （密码）
  - IPsec Pre-Shared Key for VPN （IPsec 预共享密钥）
- - Operating System Image （操作系统镜像，Ubuntu 20.04/18.04/16.04 或 Debian 9）
+ - Operating System Image （操作系统镜像，Ubuntu 20.04/18.04 或 Debian 9）
  - Virtual Machine Size （虚拟机大小，默认值： Standard_B1s）
 
 **注：** \*不要\* 在值中使用这些字符： `\ " '`

azure/README.md

@@ -9,7 +9,7 @@ Customizable with the following options:
  - Username for VPN **and** SSH
  - Password for VPN **and** SSH
  - IPsec Pre-Shared Key for VPN
- - Operating System Image (Ubuntu 20.04/18.04/16.04 or Debian 9)
+ - Operating System Image (Ubuntu 20.04/18.04 or Debian 9)
  - Virtual Machine Size (Default: Standard_B1s)
 
 **Note:** DO NOT use these special characters within values: `\ " '`