How many of you use SSH passwords to access your server, and how many of you only use SSH keys? If you're using keys, have you also completely disabled SSH password access?
Really depends on the web host. Before you look into ssh key only (+disable password authentication), make sure your web host is setup with features that allow you to regain access to your server if you ever loose your ssh key's private key and that you know how to use those features to regain access. If you don't know how to use those features, setup a test instance/VPS with that web host and test it out. If you're with web host with hourly billed VPSes like Linode, DigitalOcean, and Vultr then it is relatively cheap to test out for a few hours on a test VPS. Here's a example text you can use to ask your web host to be sure There's numerous how to use ssh key login guides online, but not many go beyond that to explain what to do if you loose your ssh private key and are unable to use password logins. And that can come down to your web host and what measures they have in place i.e. out of band console access etc and recovery ISO/cds available.
And some relevant guides with different web hosts about setting up SSH key authentication and also about recovery as well general need to know info. DigitalOcean Has out of band console access How To Use SSH Keys with DigitalOcean Droplets | DigitalOcean How To Recover from File System Corruption Using Fsck and a Recovery ISO | DigitalOcean Linode Has out of band console access called Lish Use Public Key Authentication with SSH Using the Linode Shell (Lish) Vultr Has out of band console access How Do I Generate SSH Keys? - Vultr.com Access Single User Mode (Reset Root Password) - Vultr.com Using Finnix Rescue CD to Rescue, Repair, or Backup Your Linux System - Vultr.com OVH Installation of OVH SSH key — OVH Documentation 0.0.1 documentation SSH key for Public Cloud — OVH Documentation 0.0.1 documentation Creating SSH keys- OVH Replacing your lost SSH key pair - OVH Become root and select a password - OVH RamNode How do I add an SSH key to my VPS? - Knowledgebase - RamNode Others Finnix Recovery CD - Mammoth Cloud If folks have other linked guides to add for other web hosts etc