在 AWS 实例中设置环境变量 [英] Set environment variables in an AWS instance

问题描述

我使用以下资源在 EC2 中使用 terraform 创建了一个AMI:

I create an AMI in EC2 with terraform with this resource:

resource "aws_instance" "devops-demo" {
  ami           = "jnkdjsndjsnfsdj"
  instance_type = "t2.micro"
  key_name      = "demo-devops"
  user_data     = "${file("ops_setup.sh")}"
}

用户数据执行安装 Java JRE 的 shell 脚本:

The user data executes a shell script that install Java JRE:

  sudo yum remove java-1.7.0-openjdk -y
  sudo wget -O /opt/server-jre-8u172-linux-x64.tar.gz --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u172-b11/a58eab1ec242421181065cdc37240b08/server-jre-8u172-linux-x64.tar.gz"
  sudo tar xzf /opt/server-jre-8u172-linux-x64.tar.gz
  export JAVA_HOME=/jdk1.8.0_172
  export JRE_HOME=/jdk1.8.0_171/jre
  export PATH=$JAVA_HOME/bin:$PATH

但是所有环境变量都不起作用.但是，如果我通过 ssh 连接到实例并执行导出命令，它就可以正常工作.

But none of the environment variables work. However, if I connect by ssh to the instance and I execute the export command, it works fine.

有没有办法用 terraform 定义环境变量?

Is there any way to define the environment variables with terraform?

推荐答案

使用 export 命令只会为当前 shell 和从该 shell 启动的所有进程设置这些变量.这不是一个持久的设置.您希望永久保存的任何内容都应在 /etc/environment 中设置.

Using the export command only sets those variables for the current shell and all processes that start from that shell. It is not a persistent setting. Anything you wish to make permanent should be set in /etc/environment.

例如在用户数据中:

echo "JAVA_HOME=/jdk1.8.0_172" >> /etc/environment

这会将 JAVA_HOME=/jdk1.8.0_172 行添加到该文件中.请注意，您不应在该文件中使用 export.

This would add the JAVA_HOME=/jdk1.8.0_172 line to that file. Note, you should not use export inside that file.

PATH 变量可能已在 /etc/environment 文件中定义，如果您要向其附加其他路径，则需要适当地覆盖它.

The PATH variable is likely already defined in the /etc/environment file and you'll need to overwrite that appropriately if you are going to append additional paths to it.

此答案中提供了有关设置环境变量的详细信息.

There is really great details on setting environment variables available in this answer.

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