Terraform 仅运行多部分用户数据的第一部分

Question

我正在研究使用 Terraform 设置 VM 基础结构并使用 cloud-init 启动 VM。我正在尝试对第一部分使用 cloud-config 内容类型，对第二部分使用 shellscript 的多部分方法。

但是，在 terraform apply 时，只有第一部分得到执行，而第二部分没有运行（通过检查生成的 VM 是否应用了更改）。

相关配置部分如下

data "template_cloudinit_config" "config" {
  gzip = true
  base64_encode = true
  part {
      filename = "init-cloud-config"
      content_type = "text/cloud-config"
      content = file("../modules/services/${var.service_name}/init.yaml")
  }
  part {
      filename = "init-shellscript"
      content_type = "text/x-shellscript"
      content = templatefile("../modules/services/${var.service_name}/init.sh",
        { hostname = "${var.prefix}-${var.service_name}" }
      )
  }
}

cloud-init的内容init.yaml如下

groups:
  - dataops

users:
  - default
  - name: dataops
    gecos: Data Operations
    shell: /bin/bash
    primary_group: dataops
    sudo: ALL=(ALL) NOPASSWD:ALL
    groups: users, admin
    lock_passwd: false

package_update: true

packages:
  - wget

shellscript的内容init.sh只有一行

hostnamectl set-hostname testconfig

云端错误-init.log如下

2021-06-29 16:09:51,315 - util.py[DEBUG]: Running command ['/var/lib/cloud/instance/scripts/init-shellscript'] with allowed return codes [0] (shell=False, capture=False)
2021-06-29 16:09:51,317 - util.py[WARNING]: Failed running /var/lib/cloud/instance/scripts/init-shellscript [-]
2021-06-29 16:09:51,317 - util.py[DEBUG]: Failed running /var/lib/cloud/instance/scripts/init-shellscript [-]
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/cloudinit/util.py", line 2048, in subp
    env=env, shell=shell)
  File "/usr/lib64/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib64/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 8] Exec format error: b'/var/lib/cloud/instance/scripts/init-shellscript'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/cloudinit/util.py", line 896, in runparts
    subp(prefix + [exe_path], capture=False)
  File "/usr/lib/python3.6/site-packages/cloudinit/util.py", line 2056, in subp
    stderr="-" if decode else b"-")
cloudinit.util.ProcessExecutionError: Exec format error. Missing #! in script?
Command: ['/var/lib/cloud/instance/scripts/init-shellscript']
Exit code: -
Reason: [Errno 8] Exec format error: b'/var/lib/cloud/instance/scripts/init-shellscript'
Stdout: -
Stderr: -
2021-06-29 16:09:51,329 - cc_scripts_user.py[WARNING]: Failed to run module scripts-user (scripts in /var/lib/cloud/instance/scripts)
2021-06-29 16:09:51,330 - handlers.py[DEBUG]: finish: modules-final/config-scripts-user: FAIL: running config-scripts-user with frequency once-per-instance
2021-06-29 16:09:51,330 - util.py[WARNING]: Running module scripts-user (<module 'cloudinit.config.cc_scripts_user' from '/usr/lib/python3.6/site-packages/cloudinit/config/cc_scripts_user.py'>) failed    
2021-06-29 16:09:51,330 - util.py[DEBUG]: Running module scripts-user (<module 'cloudinit.config.cc_scripts_user' from '/usr/lib/python3.6/site-packages/cloudinit/config/cc_scripts_user.py'>) failed      
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/cloudinit/stages.py", line 852, in _run_modules
    freq=freq)
  File "/usr/lib/python3.6/site-packages/cloudinit/cloud.py", line 54, in run
    return self._runners.run(name, functor, args, freq, clear_on_fail)
  File "/usr/lib/python3.6/site-packages/cloudinit/helpers.py", line 187, in run
    results = functor(*args)
  File "/usr/lib/python3.6/site-packages/cloudinit/config/cc_scripts_user.py", line 45, in handle
    util.runparts(runparts_path)
  File "/usr/lib/python3.6/site-packages/cloudinit/util.py", line 903, in runparts
    % (len(failed), len(attempted)))
RuntimeError: Runparts: 1 failures in 1 attempted commands
2021-06-29 16:09:51,356 - stages.py[DEBUG]: Running module ssh-authkey-fingerprints (<module 'cloudinit.config.cc_ssh_authkey_fingerprints' from '/usr/lib/python3.6/site-packages/cloudinit/config/cc_ssh_authkey_fingerprints.py'>) with frequency once-per-instance

Answer 1

该错误中的相关行是这样的：

cloudinit.util.ProcessExecutionError: Exec format error. Missing #! in script?

对于 cloud-init 到运行用户数据 shell 脚本，它需要知道解释器将是什么，因此必须以 shebang - #! - 和路径开头给解释器，所以你的脚本应该看起来像这样：

#!/bin/sh
hostnamectl set-hostname testconfig

或者在您的情况下，它是一个模板，期望 hostname 作为变量传入，因此它应该是：

#!/bin/sh
hostnamectl set-hostname ${hostname}

Terraform 仅运行多部分用户数据的第一部分

Terraform only runs the first part of multi-part user data

cloud-init

terraform