1. On Server 1 (192.168.1.67)
ssh-keygen -t rsa cd .ssh/ scp -r id_rsa.pub root@192.168.1.68:/root/.ssh/authorized_keys
2. On Server 2 (192.168.1.68)
ssh-keygen -t rsa cd .ssh cat id_rsa.pub >> authorized_keys
3. Send Server 2 authorized key to Server 1 (192.168.1.67)
scp -r authorized_keys root@192.168.1.67:/root/.ssh
4. Test from server 1
ssh root@192.168.1.68 Test from Server 2 ssh root@192.168.1.67
5. On Server 3 (192.168.1.69)
ssh-keygen -t rsa cd .ssh cat id_rsa.pub >> authorized_keys
6. On Server 4 (192.168.1.70)
ssh-keygen -t rsa cd .ssh cat id_rsa.pub >> authorized_keys
7. 5. On Server 5 (192.168.1.71)
ssh-keygen -t rsa cd .ssh cat id_rsa.pub >> authorized_keys
8. 5. On Server 6 (192.168.1.72)
ssh-keygen -t rsa cd .ssh cat id_rsa.pub >> authorized_keys
9. Now on Server 1 192.168.1..67
create a file called hosts.txt in /root directory, and save the ips of the below host
192.168.1.68
1192.168.1.69
192.168.1.70
192.168.1.71
192.168.1.72
To execute a remote command on all the hosts from server 1 run below command :
-- Run Single Command -- for host in $(cat hosts.txt); do ssh "$host" "date" > "output.$host"; done
-- Run Multiple Commands -- for host in $(cat hosts.txt); do ssh "$host" "uname -a && date && df -h" > "output.$host"; done #Double-ampersands will execute the next command only if the preceding command exits with a status of zero. In the below example, for host in $(cat hosts.txt); do ssh "$host" "uname -a ; date ; df -h" > "output.$host"; done #Semi-colons will execute all commands regardless of exit status. In the below example, all three commands will be run. # In short: double-ampersands should be used if the commands depend on each other, semi-colons should be used if they don't.
