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I'm using bonding in
active-fallback mode to guarantee maximum availability on some critical
servers. The mii mode is active so I can detect things like dead card and/or unplugged cable even on the inactive slave. But how do I check that the inactive slave is properly configured/connected to the switch/vlan? I ask this question because it has just bitten me in a part I'll keep undisclosed. Scenario: your bond0 is running fine. it uses eth0 as active slave and eth2 as inactive slave (different cards/ different driver to be safe) some bozo reconfigures the switch port where your eth2 is plugged in and you don't notice it (the crucial point here) later on, your eth0 dies (or is unplugged by the brother of the first bozo) and bamm... your nice HA node is off-line. note: eth2 is still plugged and fine at the mii level. even an arp would return OK so going from mii to arp for the bond is not the right option. So. How could I check that an IP packet send via eth2 would really reach its vlan? I tried a probably naive thing: ifenslave -d bond0 eth2 ifconfig eth2 $ip netmask 255.255.255.255 route add -host $target eth2 ping $target (target is the gateway, ip is a reserved IP used only on this server to do that check) but it does not work as I hopped. Sometimes the ping is OK (but goes thru bond0) sometimes it blocks... The real question is How to do it properly (rather than how to fix my naive try). Thank you for your help. Olivier |
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