docker で --cap-add NET_ADMIN した場合の組み込みDNSの挙動（特に変わりはない）

docker-compose.yml

# vi: set ts=2 sw=2 sts=0 et:

version: '2'

services:
  netcap:
    image: debian
    cap_add:
      - NET_ADMIN
    tty: true
    command: ping srv
  srv:
    image: debian
    command: sleep infinity

result.md

[mapk0y@lubuntu:~/local/docker/compose/cap-net-admin]$ docker version
Client:
 Version:      1.12.3
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   6b644ec
 Built:        Wed Oct 26 21:44:32 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.12.3
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   6b644ec
 Built:        Wed Oct 26 21:44:32 2016
 OS/Arch:      linux/amd64
[mapk0y@lubuntu:~/local/docker/compose/cap-net-admin]$ docker-compose version
docker-compose version 1.9.0, build 2585387
docker-py version: 1.10.6
CPython version: 2.7.9
OpenSSL version: OpenSSL 1.0.1t  3 May 2016
[mapk0y@lubuntu:~/local/docker/compose/cap-net-admin]$ docker-compose up
Starting capnetadmin_srv_1
Starting capnetadmin_netcap_1
Attaching to capnetadmin_srv_1, capnetadmin_netcap_1
netcap_1  |  (172.19.0.2): 56 data bytes
netcap_1  | 64 bytes from 172.19.0.2: icmp_seq=0 ttl=64 time=0.071 ms
netcap_1  |  from 172.19.0.2: icmp_seq=1 ttl=64 time=0.103 ms
netcap_1  |  from 172.19.0.2: icmp_seq=2 ttl=64 time=0.099 ms
netcap_1  |  from 172.19.0.2: icmp_seq=3 ttl=64 time=0.101 ms
netcap_1  |  from 172.19.0.2: icmp_seq=4 ttl=64 time=0.101 ms
netcap_1  |  from 172.19.0.2: icmp_seq=5 ttl=64 time=0.089 ms
netcap_1  |  from 172.19.0.2: icmp_seq=6 ttl=64 time=0.099 ms
netcap_1  |  from 172.19.0.2: icmp_seq=7 ttl=64 time=0.074 ms