修改openstack Centos镜像的默认用户的密码
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Ubuntu官方提供的OpenStack镜像是用Key来登录的，太麻烦，可以改成用密码来登录。
修改image的工具叫：guestfish。
1、安装修改的工具
[root@server-3images]# yum install libguestfs-tools -y
Failed to set locale, defaulting to C.UTF-8
Repository extras is listed more than once in theconfiguration
Last metadata expiration check: 1:13:27 ago on SunApr 18 13:13:08 2021.
Dependencies resolved.
================================================================================================================================================================================================================
Package Architecture Version Repository Size
================================================================================================================================================================================================================
Installing:
libguestfs-tools noarch 1:1.40.2-25.module_el8.3.0+555+a55c8938 AppStream 28 k
Installing dependencies:
libguestfs-tools noarch 1:1.40.2-25.module_el8.3.0+555+a55c8938 AppStream 28 k
Installing dependencies:
hexedit x86_64 1.2.13-12.el8 AppStream 46 k
libguestfs-tools-c x86_64 1:1.40.2-25.module_el8.3.0+555+a55c8938 AppStream 5.6 M
perl-Class-Inspector noarch 1.32-2.el8 AppStream 37 k
…
…
…
Verifying :perl-libintl-perl-1.29-2.el8.x86_64 10/10
Installed products updated.
Installed:
hexedit-1.2.13-12.el8.x86_64 libguestfs-tools-1:1.40.2-25.module_el8.3.0+555+a55c8938.noarch libguestfs-tools-c-1:1.40.2-25.module_el8.3.0+555+a55c8938.x86_64
libguestfs-xfs-1:1.40.2-25.module_el8.3.0+555+a55c8938.x86_64 perl-Class-Inspector-1.32-2.el8.noarch perl-File-ShareDir-1.104-3.el8.noarch
perl-Sys-Guestfs-1:1.40.2-25.module_el8.3.0+555+a55c8938.x86_64 perl-Sys-Virt-6.0.0-1.module_el8.3.0+555+a55c8938.x86_64 perl-hivex-1.3.18-20.module_el8.3.0+555+a55c8938.x86_64
perl-libintl-perl-1.29-2.el8.x86_64
Complete!
2、打开下载的镜像
##ubuntu 的官方镜像站： http://cloud-images.ubuntu.com/
##centos 的官方镜像站： http://cloud.centos.org/
##[root@server-3images]# wget http://cloud-images.ubuntu.com/releases/groovy/release-20210209/ubuntu-20.10-server-cloudimg-arm64.img
[root@server-3images]# pwd
/var/lib/libvirt/images
[root@server-3images]# ls
CentOS-7-x86_64-GenericCloud-1607.qcow2 ubuntu-20.10-server-cloudimg-arm64.img
[root@server-3images]# guestfish --rw -a ubuntu-20.10-server-cloudimg-arm64.img
Welcome to guestfish, the guest filesystem shell for
editing virtual machine filesystems and disk images.
Type: ‘help’ for help on commands
‘man’ toread the manual
‘quit’ toquit the shell
><fs> run #先运行这个镜像
100%[#################################################################################################################################################################################################]--:--
><fs> list-filesystems #列出所有的文件系统
/dev/sda1: ext4
/dev/sda15: vfat
><fs> mount /dev/sda1 / #挂载到根目录
><fs> vi /etc/cloud/cloud.cfg
编辑文件/etc/cloud/cloud.cfg，因为我们要修改默认用户root的密码并且开启root的ssh登陆，很简单加入下面的内容就行了，上面两个是修改。
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