forked from uncloud/uncloud
67 lines
2 KiB
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67 lines
2 KiB
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VM images
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==================================
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Overview
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---------
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ucloud tries to be least invasise towards VMs and only require
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strictly necessary changes for running in a virtualised
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environment. This includes configurations for:
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* Configuring the network
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* Managing access via ssh keys
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* Resizing the attached disk(s)
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Upstream images
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---------------
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The 'official' uncloud images are defined in the `uncloud/images
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<https://code.ungleich.ch/uncloud/images>`_ repository.
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How to make you own Uncloud images
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----------------------------------
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.. note::
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It is fairly easy to create your own images for uncloud, as the common
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operations (which are detailed below) can be automatically handled by the
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`uncloud/uncloud-init <https://code.ungleich.ch/uncloud/uncloud-init>`_ tool.
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Network configuration
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~~~~~~~~~~~~~~~~~~~~~
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All VMs in ucloud are required to support IPv6. The primary network
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configuration is always done using SLAAC. A VM thus needs only to be
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configured to
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* accept router advertisements on all network interfaces
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* use the router advertisements to configure the network interfaces
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* accept the DNS entries from the router advertisements
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Configuring SSH keys
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~~~~~~~~~~~~~~~~~~~~
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To be able to access the VM, ucloud support provisioning SSH keys.
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To accept ssh keys in your VM, request the URL
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*http://metadata/ssh_keys*. Add the content to the appropriate user's
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**authorized_keys** file. Below you find sample code to accomplish
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this task:
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.. code-block:: sh
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tmp=$(mktemp)
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curl -s http://metadata/ssk_keys > "$tmp"
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touch ~/.ssh/authorized_keys # ensure it exists
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cat ~/.ssh/authorized_keys >> "$tmp"
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sort "$tmp" | uniq > ~/.ssh/authorized_keys
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Disk resize
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~~~~~~~~~~~
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In virtualised environments, the disk sizes might grow. The operating
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system should detect disks that are bigger than the existing partition
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table and resize accordingly. This task is os specific.
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ucloud does not support shrinking disks due to the complexity and
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intra OS dependencies.
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