Tech Wiki

$ ssh-keygen -t rsa -b 4096

If your private key is encrypted with a passphrase(when you generate it by ssh-keygen), the passphrase must be entered every time you attempt to connect to an SSH server using public-key authentication.

SSH agent is a program which caches your decrypted private keys and provides them to SSH client programs on your behalf.

$ eval $(ssh-agent)

$ echo $SSH_AUTH_SOCK

$ ssh-add (add ~/.ssh/id_rsa by default)

$ ssh -T user@remote.com

=== forwarding of authentication agent connection -A enables forwarding of the authentication agent connection. local → server1 → server2

$ eval $(ssh-agent)
$ ssh-add
$ ssh -A server1
<host1> $ ssh server2

1. install sshd package on your local machine
2. add a line in /etc/sshd/sshd_config

   AllowTcpForwarding yes

3. restart sshd service
4. ssh to start tunnel

   ssh -L 8081:localhost:8080 <oracle db host>

5. login to db web admin console http://localhost:8081/apex
6. login with 'SYS' account, then click the 'Administration' button, 'Tasks - Manage HTTP Access' , then enable HTTP access from remote clients.

$ tar -cf - xen_el5_i386_para | gzip -c -9 | ssh root@ostest117 "gzip -dc | tar -xf - -C /OVS/rpool"
$ tar czf - xen_el5_i386_para | ssh root@ostest117 "tar xzf - -C /OVS/rpool"