[gentoo-user] Ifplugd breaks services

[gentoo-user] Ifplugd breaks services

[Matti Nykyri]

Hi

I also have other problems in my life. One of them is on one of my gentoo server. This server has two network cards one serves intranet and the other internet. The on that is on the internet is attached to a cable modem. The modem is buggy and some times reboots it self losing the link so I have ifplugd there get new address via dhcp immediately. Intranet card is configured not to use ifplugd. I'm using OpenRC.

The problems are related to iptables and samba.

Samba: when ifplugd runs down the internet card samba is killed. This shouldn't happen. Samba is configured only to use intranet card. Samba always fails to start when ifplugd starts the internet card. Manual starting is required.

Iptables: the system uses new nic names (enp7s0 etc). Iptables has them correctly in the rules and in rules save. However when ifplugd cycles the internet nic all the nic names in the in-kernel rules change to eth0 an eth1. I need to zap iptables and then start it to reset the rules. 

Any suggestions where to start? Or just disable ifplugd?

--
Matti

Re: [gentoo-user] Ifplugd breaks services

[Mick]

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On Sunday 08 Jun 2014 10:25:40 Matti Nykyri wrote:
> Hi
> 
> I also have other problems in my life. One of them is on one of my gentoo
> server. This server has two network cards one serves intranet and the
> other internet. The on that is on the internet is attached to a cable
> modem. The modem is buggy and some times reboots it self losing the link
> so I have ifplugd there get new address via dhcp immediately. Intranet
> card is configured not to use ifplugd. I'm using OpenRC.

Are you sure of this?  How have you configured your intranet card to not be 
acted upon by ifplugd?  From what I see, ifplugd will pick up any interface in 
/etc/init.d:

  EXEC="/etc/init.d/net.$1"


> The problems are related to iptables and samba.
> 
> Samba: when ifplugd runs down the internet card samba is killed. This
> shouldn't happen. Samba is configured only to use intranet card. Samba
> always fails to start when ifplugd starts the internet card. Manual
> starting is required.
> 
> Iptables: the system uses new nic names (enp7s0 etc). Iptables has them
> correctly in the rules and in rules save. However when ifplugd cycles the
> internet nic all the nic names in the in-kernel rules change to eth0 an
> eth1. I need to zap iptables and then start it to reset the rules.

This does not happen here.  When ifplugd restarts a NIC it always comes back 
with the new consistent naming.  Do you have some udev rules defined which are 
picked up on the second time that the ifplugd brings up the card, but not the 
first?


> Any suggestions where to start? Or just disable ifplugd?

Have you tried configuring static IP addresses, broadcast and gateways for 
each card using the /etc/cong.d/net file?  You can still set dhcp as a fall 
back if you want, although I am not sure it is necessary for a server in a 
static LAN.

The file /usr/share/doc/netifrc-0.2.2/net.example.bz2 provides suggestions for 
different set ups.

-- 
Regards,
Mick

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Re: [gentoo-user] Ifplugd breaks services

[Matti Nykyri]

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On Sun, Jun 08, 2014 at 11:25:53AM +0100, Mick wrote:
> On Sunday 08 Jun 2014 10:25:40 Matti Nykyri wrote:
> > Hi
> > 
> > I also have other problems in my life. One of them is on one of my gentoo
> > server. This server has two network cards one serves intranet and the
> > other internet. The on that is on the internet is attached to a cable
> > modem. The modem is buggy and some times reboots it self losing the link
> > so I have ifplugd there get new address via dhcp immediately. Intranet
> > card is configured not to use ifplugd. I'm using OpenRC.
> 
> Are you sure of this?  How have you configured your intranet card to not be 
> acted upon by ifplugd?  From what I see, ifplugd will pick up any interface in 
> /etc/init.d:
> 
>   EXEC="/etc/init.d/net.$1"

Actually it's not ifplugd's fault. It is just the one that restarts services... 
The restarting is the thing that breaks stuff:

--------------------------------------------

server% [13:44] /var/log$ sudo iptables -v -L -t nat
Chain POSTROUTING (policy ACCEPT 10142 packets, 743K bytes)
 pkts bytes target     prot opt in     out     source               destination         
 8307  616K MASQUERADE  all  --  any    enp0s10  anywhere             anywhere            
server% [13:45] /var/log$ sudo /etc/init.d/net.enp0s10 stop
 * Stopping NIS Server ...                                   [ ok ]
 * samba -> stop: smbd ...                                   [ ok ]
 * samba -> stop: nmbd ...
 * start-stop-daemon: 2 process(es) refused to stop          [ !! ]
 * Unmounting network filesystems ...                        [ ok ]
 * Stopping chrooted named ...
 * Umounting chroot dirs ...
 * umounting /chroot/dns/usr/share/GeoIP ...                 [ ok ]
 * umounting /chroot/dns/etc/bind ...                        [ ok ]
 * umounting /chroot/dns/var/log/named ...                   [ ok ]
 * umounting /chroot/dns/var/bind ...                        [ ok ]
 * Stopping dhcpd ...                                        [ ok ]
 * Bringing down interface enp0s10
 *   Stopping dhclient on enp0s10 ...                        [ ok ]
 *   Stopping ifplugd on enp0s10 ...                         [ ok ]
server% [13:45] /var/log$ sudo iptables -v -L -t nat
Chain POSTROUTING (policy ACCEPT 10147 packets, 743K bytes)
 pkts bytes target     prot opt in     out     source               destination         
 8309  617K MASQUERADE  all  --  any    enp0s10  anywhere             anywhere            
server% [13:45] /var/log$ sudo /etc/init.d/net.enp0s10 start
 * Bringing up interface enp0s10
 *   Changing MAC address of enp0s10 ...                     [ ok ]
 *     changed to 00:80:23:7A:8A:A4
 *   Starting ifplugd on enp0s10 ...                         [ ok ]
 *     Backgrounding ...
 * WARNING: net.enp0s10 has started, but is inactive
server% [13:45] /var/log$ sudo iptables -v -L -t nat
Chain POSTROUTING (policy ACCEPT 10147 packets, 743K bytes)
 pkts bytes target     prot opt in     out     source               destination         
 8309  617K MASQUERADE  all  --  any    enp0s10  anywhere             anywhere            

--------------------------------------------
It takes around 40 seconds for dhclient to address from ISP (net-misc/dhcp-4.2.5_p1)
After it gets the address iptables is changed:
--------------------------------------------

server% [13:45] /var/log$ sudo iptables -v -L -t nat
Chain POSTROUTING (policy ACCEPT 2 packets, 152 bytes)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 MASQUERADE  all  --  any    eth1    anywhere             anywhere            
server% [13:48] /var/log$ ps aux | grep dhclient  
root     22011  0.0  0.2  16200  7108 ?        Ss   13:46   0:00 /sbin/dhclient -e PEER_NTP=no -e IF_METRIC=3 -q -1 -pf /var/run/dhclient-enp0s10.pid enp0s10
server% [13:48] /var/log$ ls /etc/init.d/net*
lrwxrwxrwx 1 root root     6 Oct  4  2011 /etc/init.d/net.enp0s10 -> net.lo*
lrwxrwxrwx 1 root root     6 Oct  4  2011 /etc/init.d/net.enp5s12 -> net.lo*
-rwxr-xr-x 1 root root 17412 Jan  2 23:42 /etc/init.d/net.lo*

--------------------------------------------

> > The problems are related to iptables and samba.
> > 
> > Samba: when ifplugd runs down the internet card samba is killed. This
> > shouldn't happen. Samba is configured only to use intranet card. Samba
> > always fails to start when ifplugd starts the internet card. Manual
> > starting is required.
> > 
> > Iptables: the system uses new nic names (enp7s0 etc). Iptables has them
> > correctly in the rules and in rules save. However when ifplugd cycles the
> > internet nic all the nic names in the in-kernel rules change to eth0 an
> > eth1. I need to zap iptables and then start it to reset the rules.
> 
> This does not happen here.  When ifplugd restarts a NIC it always comes back 
> with the new consistent naming.  Do you have some udev rules defined which are 
> picked up on the second time that the ifplugd brings up the card, but not the 
> first?

No I don't. And as stated when dhclient sets the address that is the point 
when the names change.

> > Any suggestions where to start? Or just disable ifplugd?
> 
> Have you tried configuring static IP addresses, broadcast and gateways for 
> each card using the /etc/cong.d/net file?  You can still set dhcp as a fall 
> back if you want, although I am not sure it is necessary for a server in a 
> static LAN.

lol. Yeap... I had an old rules set file that was set to run in 
postup()-function. Quite embarrassing :/ I don't know how I missed this...

modules_enp5s12="!plug"
modules_enp0s10="dhclient"

So enp5s12 is static and enp0s10 is dynamic with plug and dhcp.

> The file /usr/share/doc/netifrc-0.2.2/net.example.bz2 provides suggestions for 
> different set ups.

In the past there was option in the rc.conf to say that eth1 is sufficient for
net. I don't wan't any services shutdown if anything drives down the enp0s10 
NIC. Is there a way to do that with OpenRC? As you see when I stop enp0s10 all
the services that serve intranet are driven down...

-- 
-Matti

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Re: [gentoo-user] Ifplugd breaks services

[Neil Bothwick]

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On Sun, 8 Jun 2014 15:01:02 +0300, Matti Nykyri wrote:

> Actually it's not ifplugd's fault. It is just the one that restarts
> services... The restarting is the thing that breaks stuff:

Are you running ifplugd directly or letting openrc deal with this? The
latter is the recommended way for openrc, leave ifplugd installed but
don't add it to a runlevel. Does the problem persist if you do this?

Have you tried changing rc_depend_strict in /etc/rc.conf?

<flamebait>Or you could switch to systemd which I suspect could be made
to handle this situation better.</flamebait> :)


-- 
Neil Bothwick

I work with User-Surly Software.

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Re: [gentoo-user] Ifplugd breaks services

[Matti Nykyri]

> On Jun 8, 2014, at 19:15, Neil Bothwick <neil@digimed.co.uk> wrote:
> 
>> On Sun, 8 Jun 2014 15:01:02 +0300, Matti Nykyri wrote:
>> 
>> Actually it's not ifplugd's fault. It is just the one that restarts
>> services... The restarting is the thing that breaks stuff:
> 
> Are you running ifplugd directly or letting openrc deal with this? The
> latter is the recommended way for openrc, leave ifplugd installed but
> don't add it to a runlevel. Does the problem persist if you do this?

Ifplugd package doesn't have anything installed in init.d/ so it's not added to any runlevel.

> 
> Have you tried changing rc_depend_strict in /etc/rc.conf?

Setting rc_depend_strict to NO, fixes the problem :) With that set to YES all the services are killed. So I'll stick with NO. Still I think that all services stopped should be restarted by default.

> <flamebait>Or you could switch to systemd which I suspect could be made
> to handle this situation better.</flamebait> :)

I rather not ;) 

-- 
-Matti

Re: [gentoo-user] Ifplugd breaks services

[Neil Bothwick]

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On Sun, 8 Jun 2014 20:44:47 +0300, Matti Nykyri wrote:

> > Have you tried changing rc_depend_strict in /etc/rc.conf?  
> 
> Setting rc_depend_strict to NO, fixes the problem :) With that set to
> YES all the services are killed. So I'll stick with NO. Still I think
> that all services stopped should be restarted by default.

Yes, it does seem like a bug, or at least an "undocumented feature".
 
> > <flamebait>Or you could switch to systemd which I suspect could be
> > made to handle this situation better.</flamebait> :)  
> 
> I rather not ;) 

You're already using some "Lennartware" so you're already on the slippery
slope :-O


-- 
Neil Bothwick

WinErr 678: This will end your Windows session. Do you want to play
another game?

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Re: [gentoo-user] Ifplugd breaks services

[thegeezer]

On 06/08/2014 10:25 AM, Matti Nykyri wrote:
> Hi
>
> I also have other problems in my life. One of them is on one of my gentoo server. This server has two network cards one serves intranet and the other internet. The on that is on the internet is attached to a cable modem. The modem is buggy and some times reboots it self losing the link so I have ifplugd there get new address via dhcp immediately. Intranet card is configured not to use ifplugd. I'm using OpenRC.
>
> The problems are related to iptables and samba.
>
> Samba: when ifplugd runs down the internet card samba is killed. This shouldn't happen. Samba is configured only to use intranet card. Samba always fails to start when ifplugd starts the internet card. Manual starting is required.
>
> Iptables: the system uses new nic names (enp7s0 etc). Iptables has them correctly in the rules and in rules save. However when ifplugd cycles the internet nic all the nic names in the in-kernel rules change to eth0 an eth1. I need to zap iptables and then start it to reset the rules. 
>
> Any suggestions where to start? Or just disable ifplugd?
>
> --
> Matti
I used to really like ifplugd.  mostly for the audible beep when things
are disconnected as it's easier to diagnose from afar.
being able to up/down interfaces based on connection state was also
great for dynamic routing when combined with openrc/netifrc
however, lack of clear config, no way to at runtime remove it from an
interface and just complete confusion over software based interfaces
i.e. gre tunnels or even macvlans.... all mean it is slowly being
removed from my boxen.

Re: [gentoo-user] Ifplugd breaks services

[Mick]

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On Tuesday 10 Jun 2014 11:43:31 thegeezer wrote:
> I used to really like ifplugd.  mostly for the audible beep when things
> are disconnected as it's easier to diagnose from afar.

What audible beep?  Am I missing some obscure configuration variable on my 
systems?

-- 
Regards,
Mick

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Re: [gentoo-user] Ifplugd breaks services

[Matti Nykyri]

> On Jun 8, 2014, at 21:19, Neil Bothwick <neil@digimed.co.uk> wrote:

> 
> On Sun, 8 Jun 2014 20:44:47 +0300, Matti Nykyri wrote:
> 
>>> Have you tried changing rc_depend_strict in /etc/rc.conf?  
>> 
>> Setting rc_depend_strict to NO, fixes the problem :) With that set to
>> YES all the services are killed. So I'll stick with NO. Still I think
>> that all services stopped should be restarted by default.
> 
> Yes, it does seem like a bug, or at least an "undocumented feature".

Actually found the true reason for the services not starting. When you stop samba it fails to terminate 2 instances of nbmd. So when you try to start samba it fails. But it will start normally on the second go. Both of these failures will fall within samba or openrc.

>>> <flamebait>Or you could switch to systemd which I suspect could be
>>> made to handle this situation better.</flamebait> :)  
>> 
>> I rather not ;)
> 
> You're already using some "Lennartware" so you're already on the slippery
> slope :-O

Re: [gentoo-user] Ifplugd breaks services

[thegeezer]

On 06/14/2014 11:24 PM, Mick wrote:
> On Tuesday 10 Jun 2014 11:43:31 thegeezer wrote:
>> I used to really like ifplugd.  mostly for the audible beep when things
>> are disconnected as it's easier to diagnose from afar.
> What audible beep?  Am I missing some obscure configuration variable on my 
> systems?
>
lol yes
http://www.gentoo-wiki.info/Ifplugd
but mysteriously i don't have /etc/conf.d/ifplugd -- my
/etc/ifplugd/ifplugd.actions is below and is the only ifplugd file i can
find

it could be you are missing pcspeaker kernel module ?   pcspkr





# /etc/ifplugd/ifplugd.actions
if grep -q initng /proc/1/cmdline
then
    EXEC="/sbin/ngc"
    INITNG="yes"
else
    EXEC="/etc/init.d/net.$1"
    INITNG="no"
fi

case "$2" in
    up)
        if [ "${INITNG}" = "yes" ]
        then
            ARGS="-u net/$1"
        else
            ARGS="--quiet start"
        fi
        ;;
    down)
        if [ "${INITNG}" = "yes" ]
        then
            ARGS="-d net/$1"
        else
            ARGS="--quiet stop"
        fi
        ;;
    *)
        echo "$0: wrong arguments" >&2
        echo "Call with <interface> <up|down>" >&2
        exit 1
        ;;
esac

export IN_BACKGROUND=true

if [ -x "${EXEC}" ]
then
    ${EXEC} ${ARGS}
    exit 0
else
    logger -t ifplugd.act
    exit 1
fi

Re: [gentoo-user] Ifplugd breaks services

[Mick]

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On Tuesday 17 Jun 2014 22:08:11 thegeezer wrote:
> On 06/14/2014 11:24 PM, Mick wrote:
> > On Tuesday 10 Jun 2014 11:43:31 thegeezer wrote:
> >> I used to really like ifplugd.  mostly for the audible beep when things
> >> are disconnected as it's easier to diagnose from afar.
> > 
> > What audible beep?  Am I missing some obscure configuration variable on
> > my systems?
> 
> lol yes
> http://www.gentoo-wiki.info/Ifplugd
> but mysteriously i don't have /etc/conf.d/ifplugd -- my
> /etc/ifplugd/ifplugd.actions is below and is the only ifplugd file i can
> find
> 
> it could be you are missing pcspeaker kernel module ?   pcspkr
> 
> 
> 
> 
> 
> # /etc/ifplugd/ifplugd.actions
> if grep -q initng /proc/1/cmdline
> then
>     EXEC="/sbin/ngc"
>     INITNG="yes"
> else
>     EXEC="/etc/init.d/net.$1"
>     INITNG="no"
> fi
> 
> case "$2" in
>     up)
>         if [ "${INITNG}" = "yes" ]
>         then
>             ARGS="-u net/$1"
>         else
>             ARGS="--quiet start"
>         fi
>         ;;
>     down)
>         if [ "${INITNG}" = "yes" ]
>         then
>             ARGS="-d net/$1"
>         else
>             ARGS="--quiet stop"
>         fi
>         ;;
>     *)
>         echo "$0: wrong arguments" >&2
>         echo "Call with <interface> <up|down>" >&2
>         exit 1
>         ;;
> esac
> 
> export IN_BACKGROUND=true
> 
> if [ -x "${EXEC}" ]
> then
>     ${EXEC} ${ARGS}
>     exit 0
> else
>     logger -t ifplugd.act
>     exit 1
> fi


My ifpugd.actions looks the same.

I have PCSPKR built in my kernel:

$ grep -i pcspkr /usr/src/linux/.config
CONFIG_HAVE_PCSPKR_PLATFORM=y
CONFIG_PCSPKR_PLATFORM=y
CONFIG_INPUT_PCSPKR=y

I can't recall ever having heard a beep when the cable is disconnected.  :-/

-- 
Regards,
Mick

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Re: [gentoo-user] Ifplugd breaks services

[thegeezer]

On 06/17/2014 10:59 PM, Mick wrote:
> I can't recall ever having heard a beep when the cable is
> disconnected. :-/ 

odd.  i wish i knew with certainty where ifplug hooks in.

if you
# ps aux | grep ifplug

do you have a "-b" on the line? such as   /usr/sbin/ifplugd -b --iface=eth0
that's how you disable the beep, -b = nobeep

Re: [gentoo-user] Ifplugd breaks services

[Mick]

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On Wednesday 18 Jun 2014 14:03:47 thegeezer wrote:
> On 06/17/2014 10:59 PM, Mick wrote:
> > I can't recall ever having heard a beep when the cable is
> > disconnected. :-/
> 
> odd.  i wish i knew with certainty where ifplug hooks in.
> 
> if you
> # ps aux | grep ifplug
> 
> do you have a "-b" on the line? such as   /usr/sbin/ifplugd -b --iface=eth0
> that's how you disable the beep, -b = nobeep

No, this is what it shows:

/usr/sbin/ifplugd --iface=enp11s0
-- 
Regards,
Mick

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