root@www01-clone:~# wget https://repo.varnish-cache.org/GPG-key.txt
--2015-10-09 12:15:42--  https://repo.varnish-cache.org/GPG-key.txt
Resolving repo.varnish-cache.org... 194.31.39.155
Connecting to repo.varnish-cache.org|194.31.39.155|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2442 (2,4K) [text/plain]
Saving to: “GPG-key.txt”

100%[=========================================================================================================================================================================>] 2.442       --.-K/s   in 0s

2015-10-09 12:15:42 (387 MB/s) - “GPG-key.txt” saved [2442/2442]


root@www01-clone:~# apt-key add GPG-key.txt
OK