I'm trying to experiment with a small virtual cluster of machines to learn hadoop. I'm using LXD for this purpose. I've installed ssh servers on each vm and now need to connect from one vm to another. Using the IPs I get from lxc list I'm not able to connect (get a 'Connection Refused' error).
Here is (what should be) a reproducible set of commands:
Create machines
for n in 1 2 3 4 5;do
sudo lxc launch images:centos/7/amd64 hadoop$n
done
Install OpenSSH
for n in 1 2 3 4 5;do
sudo lxc exec hadoop$n -- apt-get update
sudo lxc exec hadoop$n -- apt-get upgrade -y
sudo lxc exec hadoop$n -- yum -y install openssh openssh-server openssh-clients openssl-libs;
done
Restart machines
for n in 1 2 3 4 5;do
sudo lxc stop hadoop$n
sudo lxc start hadoop$n
done
Create password less ssh connections
On the machine hosting installer (hadoop1)
(MapR 5.1 requires that the install script be run from one of the nodes where hadoop will be installed, which is why I'm running this script from one of the VMs and not my host laptop)
ssh-keygen
Host OS
sudo lxc file pull hadoop1/root/.ssh/id_rsa.pub .
for n in 2 3 4 5;do
sudo lxc file push ./id_rsa.pub hadoop$n/root/.ssh/authorized_keys -p
sudo lxc exec hadoop$n -- chmod 600 /root/.ssh/authorized_keys
sudo lxc exec hadoop$n -- sudo chown root: /root/.ssh/authorized_keys;
done
ssh root@<ip from lxc list>
...Connection refused
