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Fix mistakes in downloads docs (#5038)

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Mark Janssen 2019-08-05 03:25:47 +02:00 committed by Kubernetes Prow Robot
parent f3df0d5f4a
commit 4132cee687
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docs/downloads.md
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@ -12,12 +12,12 @@ There is also a "pull once, push many" mode as well:
* Setting ``download_run_once: True`` will make kubespray download container images and binaries only once and then push them to the cluster nodes. The default download delegate node is the first `kube-master`.
* Set ``download_localhost: True`` to make localhost the download delegate. This can be useful if cluster nodes cannot access external addresses. To use this requires that docker is installed and running on the ansible master and that the current user is either in the docker group or can do passwordless sudo, to be able to access docker.
NOTE: When download_once is true and download_localhost is false, all downloads will be done on the delegate node, including downloads for container images that are not required on that node. As a consequence, the storage required on that node will probably be more than if download_run_once was false, because all images will be loaded into the docker instance on that node, instead of just the images required for that node.
NOTE: When `download_run_once` is true and `download_localhost` is false, all downloads will be done on the delegate node, including downloads for container images that are not required on that node. As a consequence, the storage required on that node will probably be more than if download_run_once was false, because all images will be loaded into the docker instance on that node, instead of just the images required for that node.
On caching:
* When download_once is true, all downloaded files will be cached locally in $download_cache_dir, which defaults to /tmp/kubespray_cache. On subsequent provisioning runs, this local cache will be used to provision the nodes, minimizing bandwidth usage and improving provisining time. Expect about 800MB of disk space to be used on the ansible node for the cache. Disk space required for the image cache on the kubernetes nodes is a much as is needed for the largest image, which is currently slightly less than 150MB.
* By default, if download_once is false, kubespray will not retreive the downloaded images and files from the remote node to the local cache, or use that cache to pre-provision those nodes. To force the use of the cache, set download_force_cache to true.
* When `download_run_once` is `True`, all downloaded files will be cached locally in `download_cache_dir`, which defaults to `/tmp/kubespray_cache`. On subsequent provisioning runs, this local cache will be used to provision the nodes, minimizing bandwidth usage and improving provisining time. Expect about 800MB of disk space to be used on the ansible node for the cache. Disk space required for the image cache on the kubernetes nodes is a much as is needed for the largest image, which is currently slightly less than 150MB.
* By default, if `download_run_once` is false, kubespray will not retreive the downloaded images and files from the remote node to the local cache, or use that cache to pre-provision those nodes. To force the use of the cache, set `download_force_cache` to `True`.
* By default, cached images that are used to pre-provision the remote nodes will be deleted from the remote nodes after use, to save disk space. Setting download_keep_remote_cache will prevent the files from being deleted. This can be useful while developping kubespray, as it can decrease provisioning times. As a consequence, the required storage for images on the remote nodes will increase from 150MB to about 550MB, which is currently the combined size of all required container images.
Container images and binary files are described by the vars like ``foo_version``,
@ -28,9 +28,9 @@ Container images may be defined by its repo and tag, for example:
`andyshinn/dnsmasq:2.72`. Or by repo and tag and sha256 digest:
`andyshinn/dnsmasq@sha256:7c883354f6ea9876d176fe1d30132515478b2859d6fc0cbf9223ffdc09168193`.
Note, the sha256 digest and the image tag must be both specified and correspond
Note, the SHA256 digest and the image tag must be both specified and correspond
to each other. The given example above is represented by the following vars:
```
```yaml
dnsmasq_digest_checksum: 7c883354f6ea9876d176fe1d30132515478b2859d6fc0cbf9223ffdc09168193
dnsmasq_image_repo: andyshinn/dnsmasq
dnsmasq_image_tag: '2.72'