Problem with connecting between VMs

F

feldsam

New Member
Sep 19, 2013
8
0
1
Prague
Hello,

we use KVM virtualization and we have two VMs.

101 - webserver (apache, mod_php)
102 - database server (mariadb)

101 has 3 network interfaces. 2 are bridged to "net"(vmbr0), one to "lan"(vmbr1)
102 has 1 network interface bridged to "lan"

Sometimes for less that 1 minute, 101 lost connection to 102. PHP cant connect to mysql. I try to ping servers. when I ping from 101 to 102 its 100% packet loss. But when I ping from 102 to 101 its 0% packet loss.

After minute(s) its working again normaly. Also restarting apache help, but not everytime.

I dont know how to solve this.
frown.gif


101
Code: 
root@web:/home/feldsam# ifconfig
eth0      Link encap:Ethernet  HWaddr d2:ff:3a:4b:4e:3f  
          inet addr:93.185.103.242  Bcast:93.185.103.255  Mask:255.255.255.0
          inet6 addr: fe80::d0ff:3aff:fe4b:4e3f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10760037 errors:0 dropped:0 overruns:0 frame:0
          TX packets:27580 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2389942182 (2.2 GiB)  TX bytes:57512694 (54.8 MiB)


eth2      Link encap:Ethernet  HWaddr de:3c:57:d0:53:9c  
          inet addr:93.185.103.243  Bcast:93.185.103.255  Mask:255.255.255.0
          inet6 addr: fe80::dc3c:57ff:fed0:539c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3624689 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6030104 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1369793737 (1.2 GiB)  TX bytes:14787478397 (13.7 GiB)


eth3      Link encap:Ethernet  HWaddr 32:7e:97:96:ee:bb  
          inet addr:10.0.1.1  Bcast:10.0.255.255  Mask:255.255.0.0
          inet6 addr: fe80::307e:97ff:fe96:eebb/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:239980906 errors:0 dropped:0 overruns:0 frame:0
          TX packets:233151498 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:316744952602 (294.9 GiB)  TX bytes:34912096999 (32.5 GiB)


lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4922679 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4922679 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:7186122674 (6.6 GiB)  TX bytes:7186122674 (6.6 GiB)

102
Code: 
root@mysql0:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 0a:6f:e9:f2:65:47  
          inet addr:10.0.1.2  Bcast:10.0.255.255  Mask:255.255.0.0
          inet6 addr: fe80::86f:e9ff:fef2:6547/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:233528239 errors:0 dropped:0 overruns:0 frame:0
          TX packets:240361563 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:34967626032 (32.5 GiB)  TX bytes:317241696150 (295.4 GiB)


lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

host node
Code: 
root@node0:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:26:2d:03:15:4c  
          inet6 addr: fe80::226:2dff:fe03:154c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:14727470 errors:0 dropped:0 overruns:0 frame:0
          TX packets:51874174 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3281272744 (3.0 GiB)  TX bytes:74233241996 (69.1 GiB)


lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:99528 errors:0 dropped:0 overruns:0 frame:0
          TX packets:99528 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:79532612 (75.8 MiB)  TX bytes:79532612 (75.8 MiB)


tap101i0  Link encap:Ethernet  HWaddr 9e:53:bc:b1:d5:22  
          inet6 addr: fe80::9c53:bcff:feb1:d522/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:27586 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10848476 errors:0 dropped:0 overruns:71101 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:57513106 (54.8 MiB)  TX bytes:2408587508 (2.2 GiB)


tap101i1  Link encap:Ethernet  HWaddr 9e:ad:7f:78:ff:e8  
          inet6 addr: fe80::9cad:7fff:fe78:ffe8/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:256 errors:0 dropped:0 overruns:1 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:0 (0.0 B)  TX bytes:16328 (15.9 KiB)


tap101i2  Link encap:Ethernet  HWaddr 2e:ee:86:d3:eb:88  
          inet6 addr: fe80::2cee:86ff:fed3:eb88/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:6093888 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3634583 errors:0 dropped:0 overruns:2374 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:14942513137 (13.9 GiB)  TX bytes:1371836380 (1.2 GiB)


tap101i3  Link encap:Ethernet  HWaddr c6:73:db:06:6e:1b  
          inet6 addr: fe80::c473:dbff:fe06:6e1b/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:234467363 errors:0 dropped:0 overruns:0 frame:0
          TX packets:241340823 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:35103230049 (32.6 GiB)  TX bytes:318659148473 (296.7 GiB)


tap102i0  Link encap:Ethernet  HWaddr 72:93:d6:91:b9:6f  
          inet6 addr: fe80::7093:d6ff:fe91:b96f/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:241371961 errors:0 dropped:0 overruns:0 frame:0
          TX packets:234505545 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:318670616073 (296.7 GiB)  TX bytes:35105886938 (32.6 GiB)


tap103i0  Link encap:Ethernet  HWaddr a6:d7:c3:0c:c1:ef  
          inet6 addr: fe80::a4d7:c3ff:fe0c:c1ef/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:19808 errors:0 dropped:0 overruns:0 frame:0
          TX packets:25965 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:7021510 (6.6 MiB)  TX bytes:1855486 (1.7 MiB)


tap104i0  Link encap:Ethernet  HWaddr 02:39:70:9e:13:ef  
          inet6 addr: fe80::39:70ff:fe9e:13ef/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:6763 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8169 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:500953 (489.2 KiB)  TX bytes:913387 (891.9 KiB)


venet0    Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet6 addr: fe80::1/128 Scope:Link
          UP BROADCAST POINTOPOINT RUNNING NOARP  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)


veth100.0 Link encap:Ethernet  HWaddr 9e:32:eb:11:b4:3c  
          inet6 addr: fe80::9c32:ebff:fe11:b43c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:17413 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26205 errors:0 dropped:4 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:3306150 (3.1 MiB)  TX bytes:1763990 (1.6 MiB)


veth108.0 Link encap:Ethernet  HWaddr aa:37:3d:5f:ec:fb  
          inet6 addr: fe80::a837:3dff:fe5f:ecfb/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:69358 errors:0 dropped:0 overruns:0 frame:0
          TX packets:861764 errors:0 dropped:1999012 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:9893335 (9.4 MiB)  TX bytes:68907763 (65.7 MiB)


vmbr0     Link encap:Ethernet  HWaddr 00:26:2d:03:15:4c  
          inet addr:93.185.103.99  Bcast:93.185.103.255  Mask:255.255.255.0
          inet6 addr: fe80::226:2dff:fe03:154c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3097045 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2126900 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:173136112 (165.1 MiB)  TX bytes:56399550513 (52.5 GiB)


vmbr1     Link encap:Ethernet  HWaddr 9e:32:eb:11:b4:3c  
          inet addr:10.0.254.254  Bcast:10.0.255.255  Mask:255.255.0.0
          inet6 addr: fe80::2015:79ff:fee8:3f71/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:64925 errors:0 dropped:0 overruns:0 frame:0
          TX packets:84355 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:20854793 (19.8 MiB)  TX bytes:6529228 (6.2 MiB)
 
Hi, I solved it yet.

I have another VM on same bridge with the same IP as has webserver :D So my big fail.
 
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