NickNS

NickNS is DNS Server. This server resolve VM Name into IP Address on VMware ESXi.

Versions

Go 1.17 or later

Installation

Download binary file from here.

wget

On Linux:

wget https://github.com/cdsl-research/nickns/releases/latest/download/release-lin64.zip
unzip release-lin64.zip

curl

On Linux:

curl -o release-lin64.zip https://github.com/cdsl-research/nickns/releases/latest/download/release-lin64.zip
unzip release-lin64.zip

go get

go install github.com/cdsl-research/nickns

Usage

[0] Enable SSH on ESXi

Generate SSH Key on laptop.

ssh-keygen -t rsa -b 4096

Copy SSH key from from laptop to ESXi.

$ sftp root@esxi.example.com
Connected to root@esxi.example.com.
sftp> puts /path/to/id_rsa.pub /etc/ssh/keys-root/authorized_keys

Try to connect SSH on Terminal.

ssh -i /path/to/id_rsa root@esxi.example.com

[1] Edit Config files

Set ESXi Host on hosts.toml.

[host A]
address = "esxi.example.com"
port = "22"
user = "root"
identity_file = "/path/to/id_rsa"

[host B]
address = "esxi.example.com"
port = "22"
user = "root"
password = "my_password"

Set NickNS running options on config.toml.

port = 5310
domains = ["local.", "example.com."]
ttl = 3600

[2] start server

$ nickns
2020/03/14 21:40:25 NickNS Starting at 5310/udp
2020/03/14 21:40:27 [QueryHit] elastic5.local. => 192.168.0.36
2020/03/14 21:40:30 [QueryHit] elastic5.example.com. => 192.168.0.36

The command supports config options as follows.

-c string
      Path to config.toml (default "config.toml")
-n string
      Path to hosts.toml (default "hosts.toml")

Development

Build local ssh server

docker build -t ssh .
docker run -it -p 2200:22 ssh

Run DNS Server

go run main.go

Check DNS server

# Type A
$ dig A +short @127.0.0.1 -p 5300 unbound.local
192.168.0.35
$ dig A +short @127.0.0.1 -p 5300 unbound.local
192.168.0.35

# Type PTR
$ dig +short @127.0.0.1 -p 5300 -x 192.168.0.35
unbound.local.

Server Log

2020/02/29 18:47:25 Starting at 5300
2020/02/29 18:47:38 [QueryHit] unbound.local. => 192.168.0.35
2020/02/29 18:47:41 [CacheHit] unbound.local.
2020/02/29 18:47:42 [QueryHit] unbound.local. => 192.168.0.35
2020/02/29 18:47:52 [QueryHit] 35.0.168.192.in-addr.arpa. => unbound.local.