I spent hours researching how I can automate 100s of hosts that are all under one local domain. (i'm on a ubuntu linux 17.04 machine)
For example, I have node1.domain.org, node2.domain.org, and the list goes to node100.domain.org
it is practically impossible to edit the /etc/hosts file adding all the alias manually.
manually adding hostname aliases
10.2.1.3 node1.domain.org node1
The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
I tried the
ip route | grep default and found that the gateway to be 10.1.10.1 but not clue if I should be on this gateway or of any further steps from here.
cat /etc/resolv.conf and found the DNS Server I'm using
Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN 127.0.0.53 is the systemd-resolved stub resolver. run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 10.2.254.254 nameserver 220.127.116.11 nameserver 127.0.0.53
I found the DNS that all my nodes are using
xcat node1 dns
Both remote node dns and my localmachine dns matched.
However, No clue why it is domain.com in resolve.conf file and not domain.org as all the nodes are under domain.org and not domain.com (but it told it will overwrite when I try to edit it and it did. I tried to run 'sudo /etc/init.d/networking restart' or 'sudo service network-manager restart' after updating it to domain.org and the file is overwritten). I observed that can SSH using all aliases such as
node1 without using
node1.domain.org when I did this change but the file is always overwritten on system restart or when i go on to wifi connection instead of Ethernet connection.
I also tried verifying the
route command and everything looks normal, still no clue
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default gateway 0.0.0.0 UG 100 0 0 enp2s0f1
10.1.10.0 0.0.0.0 255.255.255.0 U 100 0 0 enp2s0f1
link-local 0.0.0.0 255.255.0.0 U 1000 0 0 enp2s0f1
All I want is to ssh node1 instead of ssh node1.domain.org or ssh node50 instead of ssh node50.domain.org or do ssh into any node using its alias without adding it manually to /etc/hosts. I just want to find out a robust way to do this.