Set bond primary

[adamb]

Trying to figure out how to set the primary slave on an active-backup setup.

root@tapecephhost2:~# cat /proc/net/bonding/bond0 
Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None               <--------- There has to be a way to set this?
Currently Active Slave: eth2
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth2
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: a0:36:9f:4e:b7:50
Slave queue ID: 0

Slave Interface: eth4
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: a0:36:9f:52:16:c0
Slave queue ID: 0

From what I have read I should be able to simply set bond_primary and it should work but it doesn't seem to. Does anyone know how to achieve this? I want one nic in the active-backup setup to be primary at all times when it is connected. This should be quite simple.

 

[adamb]

According to this

https://www.kernel.org/doc/Documentation/networking/bonding.txt

I should be using "primary" option, but that doesn't seem to work either.

 

[miha_r]

an old debian bug, It has long been in debian bugzilla
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699445

my patch:

--- /etc/network/if-pre-up.d/ifenslave.old       2015-05-22 17:12:59.181899294 +0500
+++ /etc/network/if-pre-up.d/ifenslave  2014-12-11 16:40:39.000000000 +0500
@@ -103,6 +103,16 @@
                        fi
                fi
        done
+
+       # primary must be set after mode (because only supported in some modes) and after enslavement.
+       # The first slave in bond-primary found in current slaves becomes the primary.
+       # If no slave in bond-primary is found, then primary does not change.
+       for slave in $IF_BOND_PRIMARY ; do
+               if grep -sq "\\<$slave\\>" "/sys/class/net/$BOND_MASTER/bonding/slaves" ; then
+                       sysfs primary "$slave"
+                       break
+               fi
+       done
 }

 setup_master()

 

[adamb]

an old debian bug, It has long been in debian bugzilla
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699445

my patch:

--- /etc/network/if-pre-up.d/ifenslave.old 2015-05-22 17:12:59.181899294 +0500
+++ /etc/network/if-pre-up.d/ifenslave 2014-12-11 16:40:39.000000000 +0500
@@ -103,6 +103,16 @@
fi
fi
done
+
+ # primary must be set after mode (because only supported in some modes) and after enslavement.
+ # The first slave in bond-primary found in current slaves becomes the primary.
+ # If no slave in bond-primary is found, then primary does not change.
+ for slave in $IF_BOND_PRIMARY ; do
+ if grep -sq "\\<$slave\\>" "/sys/class/net/$BOND_MASTER/bonding/slaves" ; then
+ sysfs primary "$slave"
+ break
+ fi
+ done
}

setup_master()

Per the link it looks like it was fixed. Im not quite sure how to apply the patch, or do I need to look for a newer version if ifenslave? I appreciate the input!

 

[adamb]

Never mind I figured it out. If I could buy you a beer I would!