ping: Name or service not known (/etc/hosts)

[netblue30]

From #6992:

$ systemctl status systemd-networkd
○ systemd-networkd.service - Network Configuration
     Loaded: loaded (/usr/lib/systemd/system/systemd-networkd.service; disabled; preset: enabled)
     Active: inactive (dead)

$ systemctl status systemd-resolved
○ systemd-resolved.service - Network Name Resolution
     Loaded: loaded (/usr/lib/systemd/system/systemd-resolved.service; disabled; preset: enabled)
     Active: inactive (dead)

$ systemctl status NetworkManager
● NetworkManager.service - Network Manager
     Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; preset: disabled)
     Active: active (running)

$ grep 127.0.0.1 /etc/hosts
127.0.0.1 testing

$ grep hosts /etc/nsswitch.conf 
hosts: mymachines resolve [!UNAVAIL=return] files myhostname dns

$ getent hosts testing
127.0.0.1       testing

$ ping testing
/usr/bin/ping: testing: Name or service not known

$ /bin/ping testing
... works fine ...

[netblue30]

Seems to be working fine on debian stable without systemd-resolvd, systemd-networkd and NetworkManager:

$ systemctl status systemd-resolved
Unit systemd-resolved.service could not be found.

$ systemctl status systemd-networkd
○ systemd-networkd.service - Network Configuration
     Loaded: loaded (/usr/lib/systemd/system/systemd-networkd.service; disabled>
     Active: inactive (dead)
TriggeredBy: ○ systemd-networkd.socket
       Docs: man:systemd-networkd.service(8)
             man:org.freedesktop.network1(5)
   FD Store: 0 (limit: 512)

$ systemctl status NetworkManager
Unit NetworkManager.service could not be found.

What distribution are you using? Also, can you run

$ firejail --noprofile testing

Thanks!

[gcb]

Bug happens on Arch. firejail 0.9.76-3

(tested distro and repo profiles)

 $ firejail --noprofile ping testing
firejail version 0.9.76

Parent pid 25093, child pid 25094
Base filesystem installed in 0.05 ms
Child process initialized in 8.33 ms
Warning: an existing sandbox was detected. /usr/bin/ping will run without any additional sandboxing features
/usr/bin/ping: testing: Name or service not known

Parent is shutting down, bye...