Hi.
I experienced occasional network problem of containers running on ubuntu server
18.04.1. Containers
can communicate with host IP always and they can communicate sometimes to the
other hosts but they
are disconnected occasionally. When the problem occurs, the ping from the
container to external hosts
does not reach at all, but very rarely they recover after, for example, several
hours later.
Disconnection happens much more easily.
The host network is organized by using netplan in the following topology.
+-eno1-< <--lan_cable--> >-+
br0--bond0-+ +-- Cisco 3650
+-en02-< <--lan_cable--> >-+
The bonding mode is balance-a1b. I also found that if one of the LAN cables is
physically disconnected,
this problem has never happened.
By using iptraf-ng, I watched the bridge device, the following br0, as well as
the slave devices.
Even if containers send a ping to the external hosts, no ping packet is
detected, when they cannot
communicate. Ping packets are detected by iptraf-ng on these devices when the
communication is working.
I guess this can be a low-level problem of virtual networking. Are there any
suggestions to solve
the problem ?
Here's the detail of the setting.
host's netplan setting
network:
version: 2
renderer: networkd
ethernets:
eno1:
dhcp4: no
eno2:
dhcp4: no
bonds:
bond0:
interfaces: [eno1, eno2]
parameters:
mode: balanec-a1b
bridges:
br0:
interfaces:
- bond0
addresses: [10.1.2.3/24]
gateway4: 10.1.2.254
dhcp4: no
host network interface status
host# ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0
state UP group default qlen 1000
link/ether 0b:25:b5:f2:e1:34 brd ff:ff:ff:ff:ff:ff
3: eno2: <NO-CARRIER,BROADCAST,MULTICAST,SLAVE,UP> mtu 1500 qdisc mq master
bond0 state UP group default qlen 1000
link/ether 0b:25:b5:f2:e1:35 brd ff:ff:ff:ff:ff:ff
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group
default qlen 1000
link/ether 0a:1a:6c:85:ff:ed brd ff:ff:ff:ff:ff:ff
inet 10.1.2.3/24 brd 10.1.2.255 scope global br0
valid_lft forever preferred_lft forever
inet6 fe80::81a:6cff:fe85:ffed/64 scope link
valid_lft forever preferred_lft forever
5: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue
master br0 state UP group default qlen 1000
link/ether 0a:54:4b:f2:d7:10 brd ff:ff:ff:ff:ff:ff
7: vethK4HOFU@if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
master br0 state UP group default qlen 1000
link/ether fe:ca:07:3e:2b:2d brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet6 fe80::fcca:7ff:fe3e:2b2d/64 scope link
valid_lft forever preferred_lft forever
9: veth77HJ0V@if8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
master br0 state UP group default qlen 1000
link/ether fe:85:f0:ef:78:b2 brd ff:ff:ff:ff:ff:ff link-netnsid 1
inet6 fe80::fc85:f0ff:feef:78b2/64 scope link
valid_lft forever preferred_lft forever
container's network interface status
root@bionic0:~# ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
6: eth0@if7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
group default qlen 1000
link/ether 00:16:3e:cb:ef:ce brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 10.1.2.20/24 brd 10.1.2.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::216:3eff:fecb:efce/64 scope link
valid_lft forever preferred_lft forever
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