已解决！ 我已经将 mysql-devel 替换为 mariadb-devel它运行成功，然后我就可以安装 mysqlcient 库.

Solved! I have replaced mysql-devel with mariadb-devel and it worked successfully, then I was able to install mysqlcient library.

我的新01_packages.config:

packages: 
  yum:
    python3-devel: []
    mariadb-devel: []

我不知道它的根本原因，但我这样做是因为我注意到通过 yum install mysql-devel 手动安装 mysql-devel 是实际安装mariadb-devel !

I don't know the root cause of it, but I did so as I noticed that the manual installation of mysql-devel through yum install mysql-devel is actually installing mariadb-devel !

这是我的 ec2 实例发布详细信息.也许是因为新的 Amazon Linux Release 2.

Here is my ec2 instance release details. Maybe it is because of the new Amazon Linux Release 2.

$ cat /etc/*-release*
NAME="Amazon Linux"
VERSION="2"
ID="amzn"
ID_LIKE="centos rhel fedora"
VERSION_ID="2"
PRETTY_NAME="Amazon Linux 2"
ANSI_COLOR="0;33"
CPE_NAME="cpe:2.3:o:amazon:amazon_linux:2"
HOME_URL="https://amazonlinux.com/"
Amazon Linux release 2 (Karoo)
cpe:2.3:o:amazon:amazon_linux:2