Multiple NIC Hosts
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Oh well, that’s interesting. So I guess we would have to “detect” NICs first and then generate /etc/network/interfaces from that. Just a quick scatch of a script that might be helpful with that:
[CODE]for iface in $(ls -1 /sys/class/net | tr -d ‘@’)
doall interface need to be up or you will get an invalid
argument error when checking the link state
ifconfig $iface up
linkstate=$(cat /sys/class/net/$iface/carrier)
if [[ “x$linkstate” = “x1” ]]
then
if [[ “x$iface” = “xlo” ]]
then
echo “auto lo”
echo “iface lo inet loopback”
else
echo “auto $iface”
echo “iface $iface inet dhcp”
echo “udhcpc_opts -t 100 -T 20”
fi
fi
done[/CODE] -
Added full paths. Replaced the ifconfig with the iproute2 replacement (it’s best to move away from a legacy tool). Redirected output to /etc/network/interfaces. If we slap this into /etc/init.d/S40network before the case statement, that should be a fix. I’ll be able to test it on Monday.
[CODE]for iface in $(ls -1 /sys/class/net | tr -d ‘@’)
doall interface need to be up or you will get an invalid
argument error when checking the link state
/sbin/ip link set $iface up
linkstate=$(/bin/cat /sys/class/net/$iface/carrier)
if [[ “x$linkstate” = “x1” ]]
then
if [[ “x$iface” = “xlo” ]]
then
echo “auto lo” > /etc/network/interfaces
echo “iface lo inet loopback” >> /etc/network/interfaces
else
echo “auto $iface” >> /etc/network/interfaces
echo “iface $iface inet dhcp” >> /etc/network/interfaces
echo -e “\tudhcpc_opts -t 100 -T 20\n” >> /etc/network/interfaces
fi
fi
done[/CODE] -
I’m adding this change to the inits.
All you’d have to do is, if you’re running the latest SVN versions, re-run the installer.
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Good to hear! Thanks everyone.
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From what I’m seeing, we don’t need the -l on the ls.
Why? Because the link is back to the /sys/devices/<location> and the separation in that folder contains multiple delimiters we need to break from. Will correct, but the for loop, from what I can see only needs to be ls /sys/class/net | tr -d ‘@’
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[quote=“Tom Elliott, post: 42949, member: 7271”]From what I’m seeing, we don’t need the -l on the ls.
Why? Because the link is back to the /sys/devices/<location> and the separation in that folder contains multiple delimiters we need to break from. Will correct, but the for loop, from what I can see only needs to be ls /sys/class/net | tr -d ‘@’[/quote]
Careful, that’s not an “L”, that’s a “One.” He set it up to do one file/directory per line.
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ahhhhh so difficult to tell sometimes.
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[quote=“cspence, post: 42950, member: 28749”]Careful, that’s not an “L”, that’s a “One.” He set it up to do one file/directory per line.[/quote]
That’s right, thanks for clarifying. And thank you Tom for adding this straight into the project. I really hope that it’s not causing any trouble for other users… -
It shouldn’t pose problems unless the nic is unsupported, in which case they’d already be having problems regardless of with or without these tweaks.
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so apparently this isn’t working properly.
I’ve changed the for loop to only add if the interfaces found does not match lo and eth0. My testing side seems to work properly, but other’s are seeing really strange things, particularly that the nic’s aren’t getting IPs. I don’t know why, maybe I can get some help over here?
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Sure I am happy to assist as much as I can!! Looking at the script in current SVN I noticed that you create ‘/etc/network/interfaces’ new from scratch (by using ‘>’) when ‘lo’ is detected. Normally that would be a good idea but when running this in my FOG test environment (QEMU) I end up with this:
[CODE]auto lo
iface lo inet loopback[/CODE]Why you ask?? Because ‘lo’ does not necessarily come first. Actually on most systems ls is sorted by alphabet and ‘e’ comes before ‘l’. Do you know what I mean?
Fix: Use “>> /etc/network/interfaces” everywhere instead of “> /etc/network/interfaces”. If you want to make sure that it’s empty then do “echo > /etc/network/interfaces” before the for loop.
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By default, udhcpc uses eth0. You will probably need to add -a $iface to udhcpc_opts. I was unsure if that would be taken care of by /etc/network/interfaces.
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What’s weird, though, is the /etc/network/interfaces appears to get the proper values set (without the -a) but even without eth0 should still be found with little issue, and without these tweaks (reverting back to only having iface eth0) everything functions properly.
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[quote=“Tom Elliott, post: 43023, member: 7271”]What’s weird, though, is the /etc/network/interfaces appears to get the proper values set (without the -a) but even without eth0 should still be found with little issue, and without these tweaks (reverting back to only having iface eth0) everything functions properly.[/quote]
Actually, I was trying to go off memory. The flag is [B]-i $iface[/B]. You don’t want to use -a. Sorry about that.
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Updated to reflect the change. Pushed to inits as well.
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Would the problems we’re seeing be related to the fact we bring the interface up, but we don’t bring it back down, so when the interface is added and the loop happens, it can’t get dhcp because it believes the link is up?
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Finally got a chance to play with it, and I have a solution.
Insert a 5-second sleep between setting the interface up and checking the link status (we can’t just check before it gets a chance to find out if it is connected to a cable). Here’s the snippet as modified.
[CODE]…
/sbin/ip link set $iface upProvide time for the interface to update linkstate
sleep 5
linkstate=$(/bin/cat /sys/class/net/$iface/carrier)
…[/CODE]Works on my end.
…and if you wait just a second, I’ll have an optimized version…
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[CODE]# Enable all interfaces
ifaces=$(ls -1 /sys/class/net | tr -d ‘@’)
for iface in $ifaces; do
/sbin/ip link set $iface up
doneProvide time for interfaces to detect their state
sleep 5
echo “auto lo” > /etc/network/interfaces
echo “iface lo inet loopback” >> /etc/network/interfacesfor iface in $ifaces; do
linkstate=$(/bin/cat /sys/class/net/$iface/carrier)
if [[ “x$linkstate” = “x1” -a “x$iface” != “xlo” ]]; then
echo “auto $iface” >> /etc/network/interfaces
echo “iface $iface inet dhcp” >> /etc/network/interfaces
echo -e “\tudhcpc_opts -t 100 -T 20\n” >> /etc/network/interfaces
fi
/sbin/ip link set $iface down
done[/CODE]This solution only requires one sleep rather than five-seconds of sleep time per interface.
Edit: Fixed typos.
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Bad statement.
linkstate=$(/bin/cat /sys/class/net/$iface
Should be
linkstate=$(/bin/cat /sys/class/net/$iface) -
Also, shouldn’t the tr -d be tr -d ‘@’ not tr -d ‘0’?
