71 lines
2.7 KiB
ReStructuredText
71 lines
2.7 KiB
ReStructuredText
===========
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simple-init
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===========
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Basic network and system configuration that can't be done until boot
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Unfortunately, as much as we'd like to bake it in to an image, we can't
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know in advance how many network devices will be present, nor if DHCP is
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present in the host cloud. Additionally, in environments where cloud-init
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is not used, there are a couple of small things, like mounting config-drive
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and pulling ssh keys from it, that need to be done at boot time.
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Autodetect network interfaces during boot and configure them
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------------------------------------------------------------
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The rationale for this is that we are likely to require multiple
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network interfaces for use cases such as baremetal and there is no way
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to know ahead of time which one is which, so we will simply run a
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DHCP client on all interfaces with real MAC addresses (except lo) that
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are visible on the first boot.
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The script `/usr/local/sbin/simple-init.sh` will be called
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early in each boot and will scan available network interfaces and
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ensure they are configured properly before networking services are started.
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Processing startup information from config-drive
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------------------------------------------------
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On most systems, the DHCP approach desribed above is fine. But in some clouds,
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such as Rackspace Public cloud, there is no DHCP. Instead, there is static
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network config via `config-drive`. `simple-init` will happily call
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`glean` which will do nothing if static network information is
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not there.
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Finally, glean will handle ssh-keypair-injection from config
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drive if cloud-init is not installed.
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Chosing glean installation source
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---------------------------------
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By default glean is installed using pip using the latest release on pypi.
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It is also possible to install glean from a specified git repository
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location. This is useful for debugging and testing new glean changes
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for example. To do this you need to set these variables::
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DIB_INSTALLTYPE_simple_init=repo
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DIB_REPOLOCATION_glean=/path/to/glean/repo
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DIB_REPOREF_glean=name_of_git_ref
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For example to test glean change 364516 do::
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git clone https://opendev.org/opendev/glean /tmp/glean
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cd /tmp/glean
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git review -d 364516
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git checkout -b my-test-ref
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Then set your DIB env vars like this before running DIB::
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DIB_INSTALLTYPE_simple_init=repo
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DIB_REPOLOCATION_glean=/tmp/glean
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DIB_REPOREF_glean=my-test-ref
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NetworkManager
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--------------
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By default, this uses the "legacy" scripts on each platform. To use
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NetworkManager instead, set ``DIB_SIMPLE_INIT_NETWORKMANAGER`` to
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non-zero. See the glean documentation for what the implications for
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this are on each platform.
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This is currently only implemented for CentOS and Fedora platforms.
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