[arch-general] Bug NetworkManager when restart NetworkManager service

[Maykel Franco]

2014-04-09 1:21 GMT+02:00 Kyle Terrien <kyleterrien at gmail.com>:
> On 04/08/2014 04:31 AM, Maykel Franco wrote:
>> Hi, I change for example dns in networkmanager, when restart
>> NetworkManager , "systemctl restart NetworkManager" the network not
>> works...
>>
>> ...
>>
>> I have reboot my computer for network on again.
>>
>> Is a bug networkmanager?
>>
>> The version is:
>>
>> maykel-arch /home/maykel # NetworkManager --version
>> 0.9.8.8
>>
>> Thanks in advanced.
>>
>
> Network goes down because NetworkManager leaves dhcpcd running. In fact
> my network remains up after running "systemctl stop
> NetworkManager.service" because dhcpcd is left managing enp0s25.
>
> If NetworkManager sees dhcpcd managing an interface when NetworkManager
> starts up, NetworkManager does funny things.
>
> So, why does "systemctl stop NetworkManager.service" leave dhcpcd
> running?
>
> The workaround:
>
> sudo systemctl stop NetworkManager.service
> sudo killall dhcpcd
> sudo systemctl start NetworkManager.service
>
> Here is a shell session where I (effectively) do the above:
>
> kyle at landru ~ $ sudo systemctl stop NetworkManager.service
> [sudo] password for kyle:
> kyle at landru ~ $ systemctl status NetworkManager.service
> ● NetworkManager.service - Network Manager
>    Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled)
>    Active: inactive (dead) since Tue 2014-04-08 15:41:08 PDT; 8s ago
>   Process: 2792 ExecStart=/usr/bin/NetworkManager --no-daemon (code=exited,
> status=0/SUCCESS)
>  Main PID: 2792 (code=exited, status=0/SUCCESS)
>
> Apr 08 15:14:14 landru NetworkManager[2792]: <info> Activation (enp0s25) suc....
> Apr 08 15:14:21 landru dhcpcd[2822]: enp0s25: no IPv6 Routers available
> Apr 08 15:14:29 landru NetworkManager[2792]: <info> (enp0s25): IP6 addrconf ....
> Apr 08 15:14:29 landru NetworkManager[2792]: <info> Activation (enp0s25) Sta....
> Apr 08 15:14:29 landru NetworkManager[2792]: <info> Activation (enp0s25) Sta....
> Apr 08 15:14:29 landru NetworkManager[2792]: <info> Activation (enp0s25) Sta....
> Apr 08 15:41:08 landru systemd[1]: Stopping Network Manager...
> Apr 08 15:41:08 landru NetworkManager[2792]: <info> caught signal 15, shutti....
> Apr 08 15:41:08 landru NetworkManager[2792]: <info> Writing DNS information ...f
> Apr 08 15:41:08 landru systemd[1]: Stopped Network Manager.
> Hint: Some lines were ellipsized, use -l to show in full.
> kyle at landru ~ $ systemctl status | grep -A 1 NetworkManager.service
>            │   │ └─3623 grep --color=auto -A 1 NetworkManager.service
>            │   └─user at 2290.service
> --
>              ├─NetworkManager.service
>              │ └─2822 /usr/bin/dhcpcd -B -K -L -G -c
> /usr/lib/networkmanager/nm-dhcp-client.action enp0s25
> kyle at landru ~ $ sudo kill 2822
> kyle at landru ~ $ systemctl status | grep -A 1 NetworkManager.service
>            │   │ └─3631 grep --color=auto -A 1 NetworkManager.service
>            │   └─user at 2290.service
> kyle at landru ~ $ systemctl status NetworkManager.service
> ● NetworkManager.service - Network Manager
>    Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled)
>    Active: inactive (dead) since Tue 2014-04-08 15:41:08 PDT; 4min 25s ago
>   Process: 2792 ExecStart=/usr/bin/NetworkManager --no-daemon (code=exited,
> status=0/SUCCESS)
>  Main PID: 2792 (code=exited, status=0/SUCCESS)
>
> Apr 08 15:14:29 landru NetworkManager[2792]: <info> (enp0s25): IP6 addrconf ....
> Apr 08 15:14:29 landru NetworkManager[2792]: <info> Activation (enp0s25) Sta....
> Apr 08 15:14:29 landru NetworkManager[2792]: <info> Activation (enp0s25) Sta....
> Apr 08 15:14:29 landru NetworkManager[2792]: <info> Activation (enp0s25) Sta....
> Apr 08 15:41:08 landru systemd[1]: Stopping Network Manager...
> Apr 08 15:41:08 landru NetworkManager[2792]: <info> caught signal 15, shutti....
> Apr 08 15:41:08 landru NetworkManager[2792]: <info> Writing DNS information ...f
> Apr 08 15:41:08 landru systemd[1]: Stopped Network Manager.
> Apr 08 15:43:59 landru dhcpcd[2822]: received signal TERM from PID 3626, st...ng
> Apr 08 15:43:59 landru dhcpcd[2822]: enp0s25: removing interface
> Hint: Some lines were ellipsized, use -l to show in full.
> kyle at landru ~ $ sudo systemctl start NetworkManager.service
> kyle at landru ~ $
>
> --Kyle
>

Thanks for all. You're right. When stop NetworkManager, leave dhcpcd running:

maykel-arch /home/maykel/ :( # systemctl stop NetworkManager
maykel-arch /home/maykel/ # ps aux | grep dhcpcd
root      8465  0.0  0.0   8648  1012 ?        S    10:14   0:00
/usr/bin/dhcpcd -B -K -L -G -c
/usr/lib/networkmanager/nm-dhcp-client.action enp4s0f2
root      8562  0.0  0.0  10924  1100 pts/1    S+   10:17   0:00 grep
--color=auto dhcpcd

All ok and it works but...Why in Debian, Ubuntu, Opensuse, for
example, when restart the networkma nager, I do not need to kill the
process networkmanager. Smooth network is well restart.

Thanks for all.