add support for kubelet in standalone mode and TLS auth #1338
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By using a systemd drop-in file for the kubelet args, we can control them using a template, while leaving the main service unit in place for dependency resolution. Signed-off-by: Ben Cressey <bcressey@amazon.com>
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Now I see why you knew about the |
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He does grow a pretty healthy mustache.... 🤔 |
zmrow
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Feb 22, 2021
etungsten
approved these changes
Feb 22, 2021
tjkirch
approved these changes
Feb 22, 2021
This also makes the API server, cluster name, and cluster certificate settings optional, since the kubelet does not need these values when running in standalone mode. Signed-off-by: Ben Cressey <bcressey@amazon.com>
This enables the kubelet to use TLS for authentication instead of AWS role credentials. If a bootstrap token is provided, the kubelet will use it to perform TLS bootstrapping. Signed-off-by: Ben Cressey <bcressey@amazon.com>
Signed-off-by: Ben Cressey <bcressey@amazon.com>
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tjkirch
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Feb 22, 2021
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Issue number:
N/A
Description of changes:
Refactored handling of kubelet args so they can be templated. Added support for "standalone" mode, where the kubelet is started without a kubeconfig file and does not connect to an API server.
Testing done:
Verified that 1.18 and 1.19 nodes came up with the expected defaults: standalone mode off, AWS authentication on.
Launched 1.15, 1.16, 1.17, 1.18, and 1.19 in standalone mode running a static redis pod. Confirmed that kubelet started correctly and brought up redis.
Launched 1.15, 1.16, 1.17, 1.18, and 1.19 in TLS authentication mode with a bootstrap token to join a cluster provisioned by the Cluster API Provider for AWS (CAPA). All nodes joined.
(Nodes are in
NotReadystatus because I haven't set up a CNI plugin.)Tested upgrade and downgrade from 1.0.5 into 1.0.6 with the migrations. Verified that new settings were removed and old lists restored on downgrade.
Terms of contribution:
By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.