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# Dockerized QEMU
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Dockerized QEMU image for reproducibly testing stuff on Windows.
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Prepare OS image as described below.
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Disk image is used as read-only using the QEMU disk snapshot option,
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all local changes are lost after Docker container restart.
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Specify MAC address via environment variable `MAC`.
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For more example see `docker-compose.yml`
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You probably need the machines to come up with
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fixed IP-s. Use static leases on your DHCP server
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to assign the IP addresses to the VM-s.
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# Windows template image preparation
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Prepare the image using libvirt or similar where you can specify
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virtio SCSI controller for storage.
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For Windows 10 install also mount
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[virtio SCSI and networking drivers ISO](https://github.com/virtio-win/virtio-win-pkg-scripts/blob/master/README.md).
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In Windows 10 partitioning wizard provide drivers from that ISO.
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Install [OpenSSH server](https://docs.microsoft.com/en-us/windows-server/administration/openssh/openssh_install_firstuse).
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Make sure OpenSSH starts during boot.
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Insert Jenkins or your favourite CI/CD software SSH public keys into
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`C:\ProgramData\ssh\administrators_authorized_keys` and adjust ACL-s as described
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[here](https://www.concurrency.com/blog/may-2019/key-based-authentication-for-openssh-on-windows)
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Use the resulting virtual machine disk image with this Docker image.
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# Debugging
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If you can't ping the VM from host, make sure bridge mode is used
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on the macvlanX interface:
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```
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ip -d link show type macvtap
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```
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