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The installation script for CoreOS will now short-circuit if Docker and Kubelet are already present, like on Ubuntu and CentOS.\r\n\r\nLastly, Kubelet service is now enabled by default on Ubuntu and CentOS (it is already done on CoreOS). On Ubuntu it should have been like this by default, but not on CoreOS, causing `kubeadm` to complain.\r\n\r\nNote that CoreOS still has 2 warnings that should be resolved, but those are not related to the `IsSystemdCheck` warning.\r\n\r\n**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:\r\nFixes #363 \r\n\r\n**Does this PR introduce a user-facing change?**:\r\n```release-note\r\nFix kubeadm warnings on CentOS and CoreOS\r\n```\r\n\r\n/assign @kron4eg "},"comment":{"url":"https://api.github.com/repos/kubermatic/kubeone/issues/comments/508083232","html_url":"https://github.com/kubermatic/kubeone/pull/541#issuecomment-508083232","issue_url":"https://api.github.com/repos/kubermatic/kubeone/issues/541","id":508083232,"node_id":"MDEyOklzc3VlQ29tbWVudDUwODA4MzIzMg==","user":{"login":"xmudrii","id":18719127,"node_id":"MDQ6VXNlcjE4NzE5MTI3","avatar_url":"https://avatars0.githubusercontent.com/u/18719127?v=4","gravatar_id":"","url":"https://api.github.com/users/xmudrii","html_url":"https://github.com/xmudrii","followers_url":"https://api.github.com/users/xmudrii/followers","following_url":"https://api.github.com/users/xmudrii/following{/other_user}","gists_url":"https://api.github.com/users/xmudrii/gists{/gist_id}","starred_url":"https://api.github.com/users/xmudrii/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/xmudrii/subscriptions","organizations_url":"https://api.github.com/users/xmudrii/orgs","repos_url":"https://api.github.com/users/xmudrii/repos","events_url":"https://api.github.com/users/xmudrii/events{/privacy}","received_events_url":"https://api.github.com/users/xmudrii/received_events","type":"User","site_admin":false},"created_at":"2019-07-03T13:01:32Z","updated_at":"2019-07-03T13:01:32Z","author_association":"MEMBER","body":"/cherrypick release/v0.9"}}
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