TIP SSHD Host Keys

From Gentoo Linux Wiki

SSH Basics OpenSSH X-forwarding Using host keys Passwordless Login Use ssh-agent for secure passwordless login Windows with SSH openssh with keys and S/Key HOWTO VPN over SSH and tun Tips & Tricks autossh keychain Reverse Tunnel Protect sshd w/ Swatch Protect sshd w/ DenyHosts Protect sshd w/ IP Tables Protect sshd w/ sshdfilter Protect sshd w/ fail2ban Distcc over SSH Other Gentoo-wiki SSH edit

[edit] Background

SSHD install or first run may not generate host keys & hence wont start or host keys are lost/corrupted etc & need replacement.

[edit] Solution

The following commands will generate new keys

/usr/bin/ssh-keygen -t rsa1 -b 1024 -f /etc/ssh/ssh_host_key -N ''
/usr/bin/ssh-keygen -d -f /etc/ssh/ssh_host_dsa_key -N ''
/usr/bin/ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''