KUBERNETES(1)(kubernetes)

💖 KUBERNETES(1) — kubeadm certs renew controller-manager.conf 💖

okay bestie, pull up a chair, we're doing crypto but make it cute 🎀 this is section 1 of the kubernetes manual, and today's main character is that one command that refreshes the certificate living inside the controller manager's kubeconfig. she's lowkey the backbone of your control plane and she deserves her moment. ✨

Originally written down by Eric Paris, January 2015 🫶

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✨ NAME ✨

kubeadm certs renew controller-manager.conf — renew the certificate embedded in the kubeconfig file for the controller manager to use 💅

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🌸 SYNOPSIS 🌸

kubeadm certs renew controller-manager.conf [OPTIONS]

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🦋 DESCRIPTION 🦋

So basically: this command renews the certificate that's embedded in the kubeconfig file for the controller manager to use. that's it, that's the vibe. 🌈

And here's the thing, bestie — renewals run unconditionally, regardless of certificate expiration date. not me checking the expiry date like it matters 😭 it doesn't. extra attributes such as SANs will be based on the existing file/certificates, so there is no need to resupply them. she already knows who she is. periodt. 👑

By default, renewal tries to use the certificate authority in the local PKI managed by kubeadm. as an alternative, it is possible to use the K8s certificate API for certificate renewal. or — as a last option — to generate a CSR request. options, options, options. we love a girl with range. 💖

⚠️ after renewal, in order to make changes effective, you're required to restart control-plane components and eventually re-distribute the renewed certificate in case the file is used elsewhere. don't skip this step, I'm begging. it's giving "changed my whole look but nobody noticed" 🙈

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💅 OPTIONS 💅

• --cert-dir="/etc/kubernetes/pki" — the path where to save the certificates 🎀
• --config="" — path to a kubeadm configuration file. 📄
• --kubeconfig="/etc/kubernetes/admin.conf" — the kubeconfig file to use when talking to the cluster. if the flag is not set, a set of standard locations can be searched for an existing kubeconfig file. she'll go looking for it herself, no cap. 🔍

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👑 OPTIONS INHERITED FROM PARENT COMMANDS 👑

• --rootfs="" — the path to the 'real' host root filesystem. this will cause kubeadm to chroot into the provided path. it's giving "we're going inside the house now" 🏠
• --version=false — --version, --version=raw prints version information and quits; --version=vX.Y.Z... sets the reported version. she can flex her version number on request, iconic. ⭐

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🔥 SEE ALSO 🔥

kubeadm-certs-renew(1),

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📜 HISTORY 📜

January 2015, originally compiled by Eric Paris (eparis at redhat dot com) based on the kubernetes source material, but hopefully they have been automatically generated since! 😭 (fr fr, hand-maintaining manpages is a whole struggle and we respect the honesty)

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and that's the whole page, bestie! 💖 this one's from the User manuals series, sitting in the kubernetes collection — the version and date live in that footer line, so here's the cute sign-off: Manuals — User — KUBERNETES(1)(kubernetes). now go restart your control-plane components, you absolute legend. 🦋✨💜