127 is a tool for mapping easy-to-remember hostnames to random loopback addresses.
The tool reads and modifies the standard hosts file on your system. There is also a Go API available. Tested on Linux, but may work on other Unix-like systems.
To install the latest version from source:
git clone https://github.com/lende/127.git
cd 127; make && sudo make installYou may also download a binary release.
$ 127 -h
127 is a tool for mapping hostnames to random loopback addresses.
Usage: 127 [option ...] [hostname]
Print IP mapped to hostname, assigning a random IP if no mapping exists.
Options:
-e echo hostname
-f string
path to hosts file (default "/etc/hosts")
-u unmap hostname
-v print version# Map example.test to a random loopback address:
$ sudo 127 example.test
127.2.221.30
# Running the command again simply returns the same IP address:
$ 127 example.test
127.2.221.30
# Ping the new host to check that it worked:
$ ping example.test
PING example.test (127.2.221.30) 56(84) bytes of data.
64 bytes from example.test (127.2.221.30): icmp_seq=1 ttl=64 time=0.042 ms
# Delete the mapping by specifying the -d flag:
$ 127 -u example.test
127.2.221.30
$ ping example.test
ping: example.test: Name or service not known
# Running the command without any arguments simply returns a random IP:
$ 127
127.167.166.218Let's say you want to try out ownCloud. Simply run:
sudo docker run --rm -p `sudo 127 owncloud.test`:80:80 owncloud:latest... and your ownCloud instance should be available at http:https://owncloud.test.