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Diffstat (limited to 'doc/sources/kernel-cmdline.txt')
| -rw-r--r-- | doc/sources/kernel-cmdline.txt | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/doc/sources/kernel-cmdline.txt b/doc/sources/kernel-cmdline.txt deleted file mode 100644 index 0b77a9af..00000000 --- a/doc/sources/kernel-cmdline.txt +++ /dev/null @@ -1,48 +0,0 @@ -In order to allow an ephemeral, or otherwise pristine image to -receive some configuration, cloud-init will read a url directed by -the kernel command line and proceed as if its data had previously existed. - -This allows for configuring a meta-data service, or some other data. - -Note, that usage of the kernel command line is somewhat of a last resort, -as it requires knowing in advance the correct command line or modifying -the boot loader to append data. - -For example, when 'cloud-init start' runs, it will check to -see if if one of 'cloud-config-url' or 'url' appear in key/value fashion -in the kernel command line as in: - root=/dev/sda ro url=http://foo.bar.zee/abcde - -Cloud-init will then read the contents of the given url. -If the content starts with '#cloud-config', it will store -that data to the local filesystem in a static filename -'/etc/cloud/cloud.cfg.d/91_kernel_cmdline_url.cfg', and consider it as -part of the config from that point forward. - -If that file exists already, it will not be overwritten, and the url parameters -completely ignored. - -Then, when the DataSource runs, it will find that config already available. - -So, in able to configure the MAAS DataSource by controlling the kernel -command line from outside the image, you can append: - url=http://your.url.here/abcdefg -or - cloud-config-url=http://your.url.here/abcdefg - -Then, have the following content at that url: - #cloud-config - datasource: - MAAS: - metadata_url: http://mass-host.localdomain/source - consumer_key: Xh234sdkljf - token_key: kjfhgb3n - token_secret: 24uysdfx1w4 - -Notes: - * Because 'url=' is so very generic, in order to avoid false positives, - cloud-init requires the content to start with '#cloud-config' in order - for it to be considered. - * The url= is un-authed http GET, and contains credentials - It could be set up to be randomly generated and also check source - address in order to be more secure |