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Good news, I finally found the crap source, it's keepalived. I tested
several times without keepalived in runlevel 3, after kernel boots I
add the ipvs service by hand:
./ipvsadm -C
# Clear previous log
> /var/log/kern.log
sleep 1
# Start debug
echo 20 > /proc/sys/net/ipv4/vs/debug_level
./ipvsadm -R < /etc/keepalived/rules-with-ops
usleep 30000
# Stop debug
echo 0 > /proc/sys/net/ipv4/vs/debug_level
Then add VIP manually, then do ARP announce manually:
vs3 ~/pkgs # ip a add 150.164.100.120/32 dev eno1
vs3 ~/pkgs # arp-sk -i eno1 -S 150.164.100.120:90:b1:1c:1a:59:46 -d
150.164.100.126
After these actions, traffic starts come in. and all ipvsadm checks
are fine, OPS is fine too. So I figured that maybe outdated libipvs in
keepalived broke the ipvs in kernel. I'll try to report this to
upstream.
On the other hand, ipvs didn't recovery from ipvsadm -C, rmmod ip_vs
&& ./ipvsadm -R < rules-with-ops is needed (I tested, reload ip_vs
module could make OPS work). So robustness of IPVS needs improvement.
Thanks for all your help and kindness :-)
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