<p>I'm using <code>kube-aws</code> to run a Kubernetes cluster on AWS, and everything works as expected.</p>

<p>Now, I realize that cron jobs aren't turned on in the version I'm using (<code>v1.7.10_coreos.0</code>), while the documentation for Kubernetes only states the following:</p>

<blockquote>
  <p>For previous versions of cluster (&lt; 1.8) you need to explicitly enable batch/v2alpha1 API by passing --runtime-config=batch/v2alpha1=true to the API server (see Turn on or off an API version for your cluster for more).</p>
</blockquote>

<p>And the documentation directed to in that text only states this (it's the actual, full documentation):</p>

<blockquote>
  <p>Specific API versions can be turned on or off by passing --runtime-config=api/ flag while bringing up the API server. For example: to turn off v1 API, pass --runtime-config=api/v1=false. runtime-config also supports 2 special keys: api/all and api/legacy to control all and legacy APIs respectively. For example, for turning off all API versions except v1, pass --runtime-config=api/all=false,api/v1=true. For the purposes of these flags, legacy APIs are those APIs which have been explicitly deprecated (e.g. v1beta3).</p>
</blockquote>

<p>I have been unsuccessful in finding information about how to change the configuration of a running cluster, and I, of course, don't want to try to re-run the command on <code>api-server</code>.</p>

<p>Note that kube-aws still use <code>hyperkube</code>, and not <code>kubeadm</code>. Also, the <code>/etc/kubernetes/manifests</code>-directory only contains the <code>ssl</code>-directory.</p>

<p>The setting I want to apply is this: <code>--runtime-config=batch/v2alpha1=true</code></p>

<p>What is the proper way, preferably using <strong><code>kubectl</code></strong>, to apply this setting and have the <code>apiserver</code>s restarted?</p>

<p>Thanks.</p>

<p><code>batch/v2alpha1=true</code> is set by default in <code>kube-aws</code>. You can find it <a href="https://github.com/kubernetes-incubator/kube-aws/blob/22673054e2e2de1f096980050a5f52060974929a/core/controlplane/config/templates/cloud-config-controller#L2040" rel="nofollow noreferrer">here</a></p>
