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kubeadm: adapt docs for 1.24 and dockershim removal

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Touch the following files:
- Implementation details: remove docker specifics, which is changing
in 1.24
- Create cluster: small language cleanup, remove note about 1.24
- Install kubeadm: Include two up-to-date tables for Linux / Windows
with known endpoints. Include cri-dockerd.
- Kubelet integration: (side cleanup) use "container runtime" instead of
"CRI runtime" (which is incorrect). Mention that only updating
"--container-runtime-endpoint=.." is required if the user wishes
to override the CR on a certain host. Dockershim->CR-foo migration
guides would make the "--container-runtime=remote" flag explicit
and we want to remove it at some point.
- Troubleshooting kubeadm: Remove some instances of Docker troubleshooting
that imply docker as default CR, or talk about old Docker versions.
Be more generic about container runtimes.
- Adding Windows nodes: move the containerd tab before the Docker
tab, as containerd is now the default. Remove note about being explicit
about --cri-socket. Add note that crictl is required for both
Docker and containerd. Add note that cri-dockerd is required if
the user wants to use Docker EE on Windows.
This commit is contained in:
Lubomir I. Ivanov
2022-01-12 18:37:05 +02:00
parent c8c474d07d
commit 3184c227c7
6 changed files with 100 additions and 100 deletions
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content/en/docs/reference/setup-tools/kubeadm/implementation-details.md
+3 -9
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@@ -81,13 +81,8 @@ The user can skip specific preflight checks or all of them with the `--ignore-pr
- Kubernetes system requirements:
- if running on linux:
- [error] if Kernel is older than the minimum required version
- [error] if required cgroups subsystem aren't in set up
- if using docker:
- [warning/error] if Docker service does not exist, if it is disabled, if it is not active.
- [error] if Docker endpoint does not exist or does not work
- [warning] if docker version is not in the list of validated docker versions
- If using other cri engine:
- [error] if crictl socket does not answer
- [error] if required cgroups subsystem aren't set up
- [error] if the CRI endpoint does not answer
- [error] if user is not root
- [error] if the machine hostname is not a valid DNS subdomain
- [warning] if the host name cannot be reached via network lookup
@@ -434,8 +429,7 @@ cluster startup problems.
Please note that:
1. `kubeadm join` preflight checks are basically a subset `kubeadm init` preflight checks
1. Starting from 1.9, kubeadm provides better support for CRI-generic functionality; in that case, docker specific controls
are skipped or replaced by similar controls for crictl.
1. Starting from 1.24, kubeadm uses crictl to communicate to all known CRI endpoints.
1. Starting from 1.9, kubeadm provides support for joining nodes running on Windows; in that case, linux specific controls are skipped.
1. In any case the user can skip specific preflight checks (or eventually all preflight checks) with the `--ignore-preflight-errors` option.