# Update existing sle micro installed with elemental

**URL:** <https://forums.suse.com/t/update-existing-sle-micro-installed-with-elemental/44524>\
**Category:** SUSE Rancher Prime\
**Created:** [November 19, 2024, 3:06pm UTC](https://forums.suse.com/t/update-existing-sle-micro-installed-with-elemental/44524 "2024-11-19T15:06:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mgiammarco](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/mgiammarco/32/6255_2.png) [@mgiammarco](https://forums.suse.com/u/mgiammarco)\
**Post date:** [November 19, 2024, 3:06pm UTC](https://forums.suse.com/t/update-existing-sle-micro-installed-with-elemental/44524/1 "2024-11-19T15:06:26Z")

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Hi,  
Suppose I have already installed Sle Micro on three servers using Elemental.  
Now I want to add an ssh key.  
How can I do it? If I update the registration endpoint I suppose the machines are not updated.  
Do I need to reinstall the servers?  
Thanks in advance,  
Mario

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<div class="post-metadata">

**Author:** ![kwk](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/kwk/32/11997_2.png) [@kwk](https://forums.suse.com/u/kwk)\
**Post date:** [February 14, 2025, 4:43pm UTC](https://forums.suse.com/t/update-existing-sle-micro-installed-with-elemental/44524/2 "2025-02-14T16:43:10Z")

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SL Micro with Elemental is following cloud-native semantics. It’s immutable with a declarative configuration and must be treated as “cattle” instead of “pet”. If cattle is sick, you just get a new one 😉

Configuration is controlled via the respective `MachineRegistration`.

In order to change the configuration (like adding an ssh key), you need to change the MachineRegistration and [reset the node](https://elemental.docs.rancher.com/reset/#machine-reset) to let it pick up the new configuration.