使用guestfish修改QEMU IMAGE的root用户密码

最新推荐文章于 2023-03-10 17:05:43 发布

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本文介绍如何利用guestfish工具在QEMU-KVM环境下修改虚拟机的root用户密码。通过编辑虚拟机内的/etc/shadow文件，实现对预装系统的密码重置。

原文：https://access.redhat.com/discussions/664843

在使用QEMU或在QEMU-KVM时，如果不知道下载的image文件的root用户的密码，可以使用guestfish工具去修改。

Using “guestfish” to change the Password for the root account:

1）You can use guestfish to edit a running system under KVM virtualization
2）You can use “guestfish” to edit the /etc/shadow file and change the root password.
3）Guestfish is an interactive shell that you can use from the command line or from shell scripts to access guest virtual machine file systems. (See example below):

安装guestfish：

yum -y install guestfish//RHEL
yum -y install libguestfs-tools//FEDORA

Import the qcow2 image into KVM. The image will be named something along the lines of: “rhel-guest-image-7.1-20150224.0.x86_64.qcow2”, (as of July 2nd, 2015, the version will of course change over time)
Change the password on the newly imported KVM to get on the pre-built system.

Example steps to change the root password using guestfish:
This set of instructions is for use on the host system that has the kvm RHEL 7 guest.
The syntax is: guestfish –rw -a
(Note, your system may be /dev/vda1, mine was /dev/sda1. Use the ‘list-filesystems’ command)

root@box1 # guestfish --rw -a ./rhel-guest-image-7.1-20150224.0.x86_64.qcow2
><fs> run
><fs> list-filesystems
><fs> mount /dev/sda1 /
><fs> vi /etc/shadow
><fs>quit //退出
>
//可以在其他命令行下面，使用下面的命令生成新密码
[root@someothersystem ~]# openssl passwd -1 changeme
$1$QiSwNHrs$uID6S6qOifSNZKzfXsmQG1