No address associated with hostname; "/etc/hosts" have no entry for self

[onlyjob]

Environment

appc Version: 0.8.11
Go Version: go1.10.3
Go OS/Arch: linux/amd64
Features: -TPM +SDJOURNAL
--
Linux 4.9.0-7-amd64 x86_64
--
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
--
systemd 239
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid

What did you do?

rkt run --net=default --hostname blah

then inside container

# ping blah
ping: zm: No address associated with hostname

# hostname
blah

# cat /etc/hosts
127.0.0.1       localhost
::1             localhost ip6-localhost ip6-loopback
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters

# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
3: eth0@if199: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 5e:e0:ae:fa:53:a4 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.16.28.12/24 brd 172.16.28.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::5ce0:aeff:fefa:53a4/64 scope link
       valid_lft forever preferred_lft forever

/etc/hosts have no entry with IP address of the container so host blah returns nothing. This is causing various run-time issues in applications that can not find IP address of their own host.