部署Elastic Beanstalk时旧AWS CLI命令失效，如何解决Python2适配报错？

根因说明 #

1. 原始部署失败是因为当前默认下载的AWS CLI v1最新版本已终止对Python 2.7的支持，而你的Elastic Beanstalk实例底层环境默认用Python 2.7运行安装脚本
2. 后续出现的UnicodeDecodeError是Python 2.7默认使用ASCII编码处理输出流，当AWS CLI输出日志包含非ASCII字符时触发编码异常，与安装命令本身无关

最优解决方法：安装无Python依赖的AWS CLI v2 #

AWS CLI v2不依赖系统自带的Python版本，完全规避Python版本兼容问题，直接修改.ebextensions/copyindexes.config的01_install_cli命令即可：

01_install_cli:
  command: |
    wget https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip
    unzip awscli-exe-linux-x86_64.zip
    ./aws/install -b ~/bin/aws
    rm -rf aws awscli-exe-linux-x86_64.zip

02_get_index:
  command: |
    aws s3 cp --region eu-west-1 s3://jthink/release_index_21.tar.gz /home/ec2-user/release_index.tar.gz
    aws s3 cp --region eu-west-1 s3://jthink/artist_index_21.tar.gz /home/ec2-user/artist_index.tar.gz
    cd /usr/share/tomcat7
    tar -xvf /home/ec2-user/release_index.tar.gz
    tar -xvf /home/ec2-user/artist_index.tar.gz
    rm /home/ec2-user/release_index.tar.gz
    rm /home/ec2-user/artist_index.tar.gz

备选方案：继续使用AWS CLI v1兼容版本 #

如果你必须保留使用AWS CLI v1，需要同时指定最后一个兼容Python2.7的版本，并添加编码环境变量规避解码错误：

01_install_cli:
  command: |
    wget https://s3.amazonaws.com/aws-cli/awscli-bundle-1.19.112.zip
    unzip awscli-bundle-1.19.112.zip
    ./awscli-bundle/install -b ~/bin/aws
    rm -rf awscli-bundle awscli-bundle-1.19.112.zip
  env:
    PYTHONIOENCODING: UTF-8
    LC_ALL: en_US.UTF-8

02_get_index:
  command: |
    aws s3 cp --region eu-west-1 s3://jthink/release_index_21.tar.gz /home/ec2-user/release_index.tar.gz
    aws s3 cp --region eu-west-1 s3://jthink/artist_index_21.tar.gz /home/ec2-user/artist_index.tar.gz
    cd /usr/share/tomcat7
    tar -xvf /home/ec2-user/release_index.tar.gz
    tar -xvf /home/ec2-user/artist_index.tar.gz
    rm /home/ec2-user/release_index.tar.gz
    rm /home/ec2-user/artist_index.tar.gz
  env:
    PYTHONIOENCODING: UTF-8
    LC_ALL: en_US.UTF-8

注：AWS CLI v1 1.19.112是官方确认的最后一个完全兼容Python 2.7的版本，搭配编码环境变量即可解决解码报错问题。

内容的提问来源于stack exchange，提问作者Paul Taylor