1、安装guestfish

yum install libguestfs-tools

注意，如果要修改windows镜像需要安装

yum install libguestfs-winsupport

2、修改配置文件：/etc/libvirt/qemu.conf

user = "root"# The groupforQEMU processes run by the system instance. It can be
# specifiedina similar way to user.
group= "root"

将user和group前面的#号放开

然后重启：

systemctl start libvirtd

3、修改文件内容

以下示例是将镜像里面的/opt/scalarizr/embedded/lib/python2.7/site-packages/scalarizr-3.3.4-py2.7.egg/scalarizr/storage2/volumes/cinder.py

的233行里面的display_description改成description

guestfish -a redhat6.7-kvm-oracle11g-22disk-pulsar2.2.qcow2 -i sh "sed -i '233s/display_description/description/' /opt/scalarizr/embedded/lib/python2.7/site-packages/scalarizr-3.3.4-py2.7.egg/scalarizr/storage2/volumes/cinder.py"

注意，不使用-i参数的话，需要在交互shell中运行

4、guestfish操作虚拟机内部

查看磁盘空间

[root@cc14 ~]# virt-df -a redhat6.7-kvm-nginx1.8.0-15disk-pulsar2.2.qcow2
Filesystem                           1K-blocks       Used  Available  Use%redhat6.7-kvm-nginx1.8.0-15disk-pulsar2.2.qcow2:/dev/sda1487652      42032     415924    9%redhat6.7-kvm-nginx1.8.0-15disk-pulsar2.2.qcow2:/dev/vg_huacloud/lv_root13294328    2416692   10179268   19%

查看镜像/root目录内容

[root@cc14 ~]# virt-ls -a redhat6.7-kvm-nginx1.8.0-15disk-pulsar2.2.qcow2 /root
.bash_history
.bash_logout
.bash_profile
.bashrc
.cshrc
.ssh
.tcshrc
.viminfo
anaconda-ks.cfg
install.log
install.log.syslog

显示指定文件内容

[root@cc14 ~]# virt-cat -a redhat6.7-kvm-nginx1.8.0-15disk-pulsar2.2.qcow2 /root/install.log
Installing libgcc-4.4.7-16.el6.x86_64
warning: libgcc-4.4.7-16.el6.x86_64: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY......

拷贝文件到镜像，从镜你拷贝文件出来

[root@cc14 ~]touch aa.txt
[root@cc14~]# virt-ls -a redhat6.7-kvm-nginx1.8.0-15disk-pulsar2.2.qcow2 /root/.bash_history
.bash_logout
.bash_profile
.bashrc
.cshrc
.ssh
.tcshrc
.viminfo
aa.txt
anaconda-ks.cfg
install.log
install.log.syslog

virt-copy-out -a redhat6.7-kvm-nginx1.8.0-15disk-pulsar2.2.qcow2 /root/aa.txt /root/

编辑虚拟机文件：

virt-edit -a redhat6.7-kvm-nginx1.8.0-15disk-pulsar2.2.qcow2 /root/aa.txt

更多guestfish用法可以参考：http://xiaoli110.blog.51cto.com/1724/1568307/