已启用 Cloud-init 的 VM 需要很长时间才能启动 - Virtual Machines

适用于：✔️ Linux VM

总结

本文介绍如何对使用 cloud-init 功能Azure虚拟机（VM）的意外启动延迟进行故障排除。 这种延迟可能导致启用了 cloud-init 的 Azure vm 部署需要两分钟（120 秒）以上的启动。

现象

启动Azure VM 需要两分钟以上才能完成未提供本地临时磁盘的 VM 产品，例如以下产品：

• Ev4 和 Esv4 系列
• Dv5 和 Dsv5 系列
• Dasv5 和 Dadsv5 系列
• DCasv5 和 DCadsv5 系列机密

如果检查 /var/log/cloud-init.log 和 /var/log/waagent.log （init 阶段）等日志文件，则会看到类似于以下示例的输出：

# grep "did not appear after 120 seconds"  *

cloud-init.log:2021-12-01 19:35:50,455 - DataSourceAzure.py[WARNING]: ephemeral device '/dev/disk/cloud/azure_resource' did not appear after 120 seconds.
cloud-init.log:2021-12-01 21:19:58,531 - DataSourceAzure.py[WARNING]: ephemeral device '/dev/disk/cloud/azure_resource' did not appear after 120 seconds.
cloud-init-output.log:2021-12-01 19:35:50,455 - DataSourceAzure.py[WARNING]: ephemeral device '/dev/disk/cloud/azure_resource' did not appear after 120 seconds.
cloud-init-output.log:2021-12-01 21:19:58,531 - DataSourceAzure.py[WARNING]: ephemeral device '/dev/disk/cloud/azure_resource' did not appear after 120 seconds.
messages:Dec  1 19:35:50 redhat84noephstor01 cloud-init[1065]: 2021-12-01 19:35:50,455 - DataSourceAzure.py[WARNING]: ephemeral device '/dev/disk/cloud/azure_resource' did not appear after 120 seconds.
messages:Dec  1 21:19:58 redhat84noephstor01 cloud-init[931]: 2021-12-01 21:19:58,531 - DataSourceAzure.py[WARNING]: ephemeral device '/dev/disk/cloud/azure_resource' did not appear after 120 seconds.

# /var/log/cloud-init.log

2021-12-01 19:35:50,481 - util.py[WARNING]: Failed partitioning operation
Device /dev/disk/cloud/azure_resource did not exist and was not created with a udevadm settle.
2021-12-01 19:35:50,481 - util.py[DEBUG]: Failed partitioning operation
Device /dev/disk/cloud/azure_resource did not exist and was not created with a udevadm settle.
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/cloudinit/config/cc_disk_setup.py", line 141, in handle
    func=mkpart, args=(disk, definition))
  File "/usr/lib/python3.6/site-packages/cloudinit/util.py", line 2292, in log_time
    ret = func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/cloudinit/config/cc_disk_setup.py", line 780, in mkpart
    assert_and_settle_device(device)
  File "/usr/lib/python3.6/site-packages/cloudinit/config/cc_disk_setup.py", line 

原因

在 VM 启动期间，cloud-init在 Python 中运行 DataSourceAzure.py 文件，然后等待本地临时磁盘（/mnt/azure_resource）可用。 由于使用的是没有本地临时磁盘的 Azure VM，cloud-init 必须等到进程超时。临时磁盘的超时间隔是启动过程继续之前的 120 秒。

解决方案

将 cloud-init 的副本升级到版本 21.2 或更高版本。

解决方法

如果无法将 cloud-init 升级到版本 21.2 或更高版本，可以编辑 DataSourceAzure.py 文件来缩短超时值。 以下示例将超时值从 120 秒修改为 2 秒：

sudo sed -i 's/maxwait=120/maxwait=2/g' $(locate DataSourceAzure.py)