On Fri, 9 Aug 2019 at 06:59, Thomas Haller <[email protected]> wrote:
>
> On Thu, 2019-08-08 at 11:41 +0100, Mike Fleetwood wrote:
> > On Wed, 7 Aug 2019 at 12:29, Thomas Haller <[email protected]>
> > wrote:
> > > On Wed, 2019-08-07 at 12:19 +0100, Mike Fleetwood via
> > > networkmanager-
> > > list wrote:
> > > > Hi,
> > > >
> > > > On my CentOS 7 / XFCE desktop, I've setup a static IP address
> > > > using
> > > > NM.
> > > > However dhclient is using DHCP and adding a second IP
> > > > address. How
> > > > do
> > > > I troubleshoot this and turn it off?
> > > >
> > > > Thanks,
> > > > Mike
> > >
> > > Hi,
> > >
> > > Don't enable DHCP (ipv4.method=auto):
> > >
> > > nmcli connection modify "$PROFILE" \
> > > ipv4.method manual \
> > > ipv4.addresses $ADDRESSES
> > >
> > >
> > > best,
> > > Thomas
> >
> > NM was already set for manual IPv4 addresses, but I reset it anyway
> > [1].
> > This didn't remove the second DHCP assigned address from the NIC, so
> > I
> > removed it manually [2]. Later in the day dhclient re-added a second
> > DHCP obtained address again[3].
> >
> > How do I stop dhclient doing this?
> >
> > Mike
> >
> >
> > [1] NM already set for manual IPv4 addresses.
> > # nmcli connection show enp5s0 | egrep 'ipv4.method|ipv4.addresses'
> > ipv4.method: manual
> > ipv4.addresses: 192.168.1.2/24
> >
> > # nmcli connection modify enp5s0 ipv4.method manual ipv4.addresses
> > 192.168.1.2/24
> >
> > # nmcli connection show enp5s0 | egrep 'ipv4.method|ipv4.addresses'
> > ipv4.method: manual
> > ipv4.addresses: 192.168.1.2/24
>
> Hi,
>
> after modifying the connection profile to set ipv4.method=manual, did
> you re-activate the profile?
>
> E.g. `nmcli connection up enp5s0`
>
> (Or did you reboot the machine since? Reboot is of course not
> necessary, you can just re-activate the profile, but it would do as
> well).
>
>
> Otherwise, show the full level=TRACE log. See
> https://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/contrib/fedora/rpm/NetworkManager.conf#n28
> for how to enable debug logging, and note the comments about private
> data and and journald's ratelimiting.
>
>
> Thanks,
> Thomas
I fixed this earlier this morning. I stopped the systemd managed
NetworkManager service. Even with the service stopped dhclient was
still running in the control group managed by systemd. Manually killed
dhclient [1].
(Rethorical question, how is that even allowed? Surely the point of
systemd using CGroups is so that it can identify all processes for a
service, which it did, and that when stopping a service it ensures all
processes stop or are killed, but it didn't).
Then I manually removed the unwanted DHCP assigned IP address again and
restarted the NetworkManager servers. No dhclient running this time
[2].
Mike
[1] Stopped NetworkManager, but dhclient still running. Killed it.
# systemctl status NetworkManager
● NetworkManager.service - Network Manager
Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service;
enabled; vendor preset: enabled)
Active: active (running) since Sun 2019-07-28 14:59:36 BST; 1 weeks
4 days ago
Docs: man:NetworkManager(8)
Main PID: 1216 (NetworkManager)
CGroup: /system.slice/NetworkManager.service
├─ 1216 /usr/sbin/NetworkManager --no-daemon
└─20511 /sbin/dhclient -d -q -sf
/usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-enp5s0.pid -lf
/var/lib...
# ps -ef | fgrep 1216
root 1216 1 0 Jul28 ? 00:00:32
/usr/sbin/NetworkManager --no-daemon
root 20511 1216 0 Aug02 ? 00:00:00 /sbin/dhclient -d -q
-sf /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-enp5s0.pid -lf
/var/lib/NetworkManager/dhclient-9a3f4eb5-765b-47b5-9a07-65ecf1aadf1b-enp5s0.lease
-cf /var/lib/NetworkManager/dhclient-enp5s0.conf enp5s0
# systemctl stop NetworkManager
# systemctl status NetworkManager
● NetworkManager.service - Network Manager
Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service;
enabled; vendor preset: enabled)
Active: inactive (dead) since Fri 2019-08-09 06:48:31 BST; 5s ago
Docs: man:NetworkManager(8)
Process: 1216 ExecStart=/usr/sbin/NetworkManager --no-daemon
(code=exited, status=0/SUCCESS)
Main PID: 1216 (code=exited, status=0/SUCCESS)
CGroup: /system.slice/NetworkManager.service
└─20511 /sbin/dhclient -d -q -sf
/usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-enp5s0.pid -lf
/var/lib...
# ps -ef | fgrep dhclient
root 20511 1 0 Aug02 ? 00:00:00 /sbin/dhclient -d -q
-sf /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-enp5s0.pid -lf
/var/lib/NetworkManager/dhclient-9a3f4eb5-765b-47b5-9a07-65ecf1aadf1b-enp5s0.lease
-cf /var/lib/NetworkManager/dhclient-enp5s0.conf enp5s0
# kill -9 20511
[2] Manually remove unwanted DHCP assigned IP address and restarted
Network Manager.
# ip address list enp5s0
2: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP group default qlen 1000
link/ether 48:5b:39:75:42:bc brd ff:ff:ff:ff:ff:ff
inet 192.168.1.191/24 brd 192.168.1.255 scope global noprefixroute
dynamic enp5s0
valid_lft 29772sec preferred_lft 29772sec
inet 192.168.1.2/24 brd 192.168.1.255 scope global secondary
noprefixroute enp5s0
valid_lft forever preferred_lft forever
inet6 fe80::39a1:ab53:fa00:828c/64 scope link noprefixroute
valid_lft forever preferred_lft forever
# ip address del 192.168.1.191/24 dev enp5s0
# ip address list enp5s0
2: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP group default qlen 1000
link/ether 48:5b:39:75:42:bc brd ff:ff:ff:ff:ff:ff
inet 192.168.1.2/24 brd 192.168.1.255 scope global noprefixroute enp5s0
valid_lft forever preferred_lft forever
inet6 fe80::39a1:ab53:fa00:828c/64 scope link noprefixroute
valid_lft forever preferred_lft forever
# systemctl start NetworkManager
# systemctl status NetworkManager
● NetworkManager.service - Network Manager
Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service;
enabled; vendor preset: enabled)
Active: active (running) since Fri 2019-08-09 06:55:06 BST; 42s ago
Docs: man:NetworkManager(8)
Main PID: 19312 (NetworkManager)
CGroup: /system.slice/NetworkManager.service
└─19312 /usr/sbin/NetworkManager --no-daemon
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