change cloud image default config
⚠ EOL (End-of-Life) notice: RHEL 7 reached EOL on 2024-06-30. The examples below use
rhel-server-7.6.qcow2 — an EOL release, and yum is the RHEL 7-era package manager.
virt-customize itself is unchanged and fully supported on RHEL 8/9, AlmaLinux and
Rocky Linux (install via dnf, e.g. sudo dnf install -y libguestfs-tools). For a
modern target, replace the image with an up-to-date cloud image, for example:
install package
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| # RHEL 7 / CentOS 7 era (EOL): yum
sudo yum install -y libguestfs-tools
# or
sudo yum install -y libguestfs-tools-c
# RHEL 8/9 / AlmaLinux / Rocky Linux: dnf
sudo dnf install -y libguestfs-tools
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Set root password
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| virt-customize -a rhel-server-7.6.qcow2 --root-password password:StrongRootPassword
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Register System
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| virt-customize -a overcloud-full.qcow2 --run-command 'subscription-manager register --username=[username] --password=[password]'
virt-customize -a rhel-server-7.6.qcow2 --run-command 'subscription-manager attach --pool [subscription-pool]'
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Install Software packages inside an image
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| virt-customize -a rhel-server-7.6.qcow2 --install [vim,bash-completion,wget,curl,telnet,unzip]
virt-customize -a rhel-server-7.6.qcow2 --install net-tools
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Upload SSH public key
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| # set ssh-key for a user(The user must exist in image)
virt-customize -a rhel-server-7.6.qcow2 --ssh-inject root:file:./id_rsa.pub
# or
virt-customize -a rhel-server-7.6.qcow2 --run-command 'useradd mystic' \
--ssh-inject mystic:file:~/.ssh/id_rsa.pub
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Uploading files
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| virt-customize -a rhel-server-7.6.qcow2 --upload rhsm.conf:/etc/rhsm/rhsm.conf
virt-customize -a rhel-server-7.6.qcow2 --upload yum.conf:/etc/yum.conf
virt-customize -a rhel-server-7.6.qcow2 --upload proxy.sh:/etc/profile.d/
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The format: local_file_path:image_file_path
Set Timezone
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| virt-customize -a rhel-server-7.6.qcow2 --timezone "Asia/Shanghai"
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Relabel SELinux
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| virt-customize -a rhel-server-7.6.qcow2 --selinux-relabel
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