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/etc/ssh/ssh_host_rsa_key
/etc/ssh/ssh_host_rsa_key.pub
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$ ssh-keygen -lf /etc/ssh/ssh_host_rsa_key.pub

3072 SHA256:IOKSUBgYconDXkZZ09c7Ak0x0JKaJvxBWDfYRehQiDE no comment (RSA)

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mv /etc/ssh/ssh_host_rsa_key /etc/ssh/ssh_host_rsa_key_back
mv /etc/ssh/ssh_host_rsa_key.pub /etc/ssh/ssh_host_rsa_key.pub_back

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ssh-keygen -t rsa -b 2048 -C '' -f /etc/ssh/ssh_host_rsa_key

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