[CentOS 7.3] I tried bonding (active-backup) with two network interfaces.

Introduction

I tried to build bonding with two network interfaces on CentOS 7.3. I would like to output the procedure until bonding is assembled.

What is bonding in the first place?

Bundle multiple network interfaces to make them redundant and improve processing capacity.

• Also called teaming.

environment

• OS

[root@tspweb01 ~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
[root@tspweb01 ~]#

• NIC

Rough composition

Remarks

• Slave Physical interface to participate in Bonding

• Master Logical interface that controls Bonding

Active-backup configuration to be configured this time

Construction procedure

Prior confirmation

** ① Network check **

--Network interface

Confirm that ʻens192 and ʻens224 are down.

[root@tspweb01 network-scripts]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0c:29:ee:2e:ba brd ff:ff:ff:ff:ff:ff
3: ens224: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0c:29:ee:2e:c4 brd ff:ff:ff:ff:ff:ff

--NetworkManager status

Confirm that the service is up

• This time, we will proceed with the setting while the service is running.

[root@tspweb01 network-scripts]# systemctl status NetworkManager
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: active (running)since fire 2020-06-16 20:11:06 JST; 17min ago
     Docs: man:NetworkManager(8)
 Main PID: 782 (NetworkManager)
   CGroup: /system.slice/NetworkManager.service
           mq782 /usr/sbin/NetworkManager --no-daemon

June 16 20:26:28 tspweb01 NetworkManager[782]: <info>  [1592306788.2383] ma...L
June 16 20:26:28 tspweb01 NetworkManager[782]: <info>  [1592306788.2384] po...S
June 16 20:26:28 tspweb01 NetworkManager[782]: <info>  [1592306788.2386] po...S
June 16 20:26:33 tspweb01 NetworkManager[782]: <info>  [1592306793.2854] de...]
June 16 20:26:33 tspweb01 NetworkManager[782]: <info>  [1592306793.2855] ma...L
June 16 20:26:33 tspweb01 NetworkManager[782]: <info>  [1592306793.2885] au..."
June 16 20:26:33 tspweb01 NetworkManager[782]: <info>  [1592306793.2890] de...]
June 16 20:26:33 tspweb01 NetworkManager[782]: <info>  [1592306793.2900] ma...L
June 16 20:26:33 tspweb01 NetworkManager[782]: <info>  [1592306793.2901] po...S
June 16 20:26:33 tspweb01 NetworkManager[782]: <info>  [1592306793.2902] po...S
Hint: Some lines were ellipsized, use -l to show in full.
[root@tspweb01 network-scripts]#

** ② Network setting file backup **

--ʻIfcfg-* `backup

mkdir -p /etc/sysconfig/network-scripts/backup_`date +'%Y%m%d'`
cp -p /etc/sysconfig/network-scripts/ifcfg-* /etc/sysconfig/network-scripts/backup_`date +'%Y%m%d'`/.
ls -la /etc/sysconfig/network-scripts/backup_`date +'%Y%m%d'`

Execution example

[root@tspweb01 network-scripts]# mkdir -p /etc/sysconfig/network-scripts/backup_`date +'%Y%m%d'`
[root@tspweb01 network-scripts]# cp -pi /etc/sysconfig/network-scripts/ifcfg-* /etc/sysconfig/network-scripts/backup_`date +'%Y%m%d'`/.
[root@tspweb01 network-scripts]#
[root@tspweb01 network-scripts]# ls -la /etc/sysconfig/network-scripts/backup_`date +'%Y%m%d'`
20 in total
drwxr-xr-x.2 root root 82 June 16 21:00 .
drwxr-xr-x.3 root root 4096 June 16 20:59 ..
-rw-r--r--.1 root root 153 June 16 20:25 ifcfg-ens192
-rw-r--r--.1 root root 153 June 12 07:54 ifcfg-ens224
-rw-r--r--.1 root root 254 September 12 2016 ifcfg-lo
[root@tspweb01 network-scripts]#

** ③ bonding.conf backup **

--Check for the existence of bonding.conf

Make sure that bonding.conf does not exist.

[root@tspweb01 network-scripts]# ls -l /etc/modprobe.d/bonding.conf;date
ls: /etc/modprobe.d/bonding.Unable to access conf:There is no such file or directory
Tuesday, June 16, 2020 20:30:30 JST
[root@tspweb01 network-scripts]#

• If it exists, perform file backup

cp -p /etc/modprobe.d/bonding.conf /etc/modprobe.d/bonding.conf_`date +'%Y%m%d'`
ls -la /etc/modprobe.d/bonding.conf_`date +'%Y%m%d'`

Setup steps

** ① Create and check bonding.conf **

--Create bonding.conf

vi /etc/modprobe.d/bonding.conf

Settings

alias bond0 bonding

After setting, save with wq!.

--bonding.conf Check the contents

It must be the set content.

[root@tspweb01 modprobe.d]# cat /etc/modprobe.d/bonding.conf
alias bond0 bonding
[root@tspweb01 modprobe.d]#

** ② NIC setting **

• ens192

vi /etc/sysconfig/network-scripts/ifcfg-ens192

Contents

TYPE=Ethernet
BOOTPROTO=none
IPV6INIT=no
NAME=ens192
HWADDR=00:0c:29:ee:2e:ba
DEVICE=ens192
ONBOOT=yes
MASTER=bond0
SLAVE=yes

• ens224

vi /etc/sysconfig/network-scripts/ifcfg-ens224

Contents

TYPE=Ethernet
BOOTPROTO=none
IPV6INIT=no
NAME=ens224
HWADDR=00:0c:29:ee:2e:c4
DEVICE=ens224
ONBOOT=yes
MASTER=bond0
SLAVE=yes

** [Explanation of settings] **

** ③ NIC setting check **

• ifcfg-ens192

[root@tspweb01 network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-ens192
TYPE=Ethernet
BOOTPROTO=none
IPV6INIT=no
NAME=ens192
HWADDR=00:0c:29:ee:2e:ba
DEVICE=ens192
ONBOOT=yes
MASTER=bond0
SLAVE=yes
[root@tspweb01 network-scripts]#

• ifcfg-ens224

[root@tspweb01 network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-ens224
TYPE=Ethernet
BOOTPROTO=none
IPV6INIT=no
NAME=ens224
HWADDR=00:0c:29:ee:2e:c4
DEVICE=ens224
ONBOOT=yes
MASTER=bond0
SLAVE=yes
[root@tspweb01 network-scripts]#

** ④ bonding setting **

vi /etc/sysconfig/network-scripts/ifcfg-bond0

Contents

BOOTPROTO=none
DEVICE=bond0
TYPE=Bond
ONBOOT=yes
IPADDR=192.168.0.41
PREFIX=24
GATEWAY=192.168.0.1
BONDING_OPTS="mode=1 miimon=100 primary=ens192 primary_reselect=1"

** [BONDING_OPTS description] **

BONDING_OPTS="mode=1 miimon=100"

** ⑤ Bonding setting confirmation **

[root@tspweb01 network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-bond0
BOOTPROTO=none
DEVICE=bond0
TYPE=Bond
ONBOOT=yes
IPADDR=192.168.0.41
PREFIX=24
GATEWAY=192.168.0.1
BONDING_OPTS="mode=1 miimon=100 primary=ens192 primary_reselect=1"
[root@tspweb01 network-scripts]#

** ⑥ network service restart **

systemctl restart network

Confirm after setting

** ① Check IP information **

Confirm that bond0 exists.

[root@tspweb01 network-scripts]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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: ens192: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP qlen 1000
    link/ether 00:0c:29:ee:2e:ba brd ff:ff:ff:ff:ff:ff
3: ens224: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP qlen 1000
    link/ether 00:0c:29:ee:2e:ba brd ff:ff:ff:ff:ff:ff
4: ens256: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0c:29:ee:2e:ce brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.45/24 brd 192.168.0.255 scope global ens256
       valid_lft forever preferred_lft forever
    inet6 2404:7a80:91a1:4d00:20c:29ff:feee:2ece/64 scope global tentative mngtmpaddr dynamic
       valid_lft 2592000sec preferred_lft 604800sec
    inet6 fe80::20c:29ff:feee:2ece/64 scope link tentative
       valid_lft forever preferred_lft forever
7: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
    link/ether 00:0c:29:ee:2e:ba brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.41/24 brd 192.168.0.255 scope global bond0
       valid_lft forever preferred_lft forever
    inet6 2404:7a80:91a1:4d00:20c:29ff:feee:2eba/64 scope global tentative mngtmpaddr dynamic
       valid_lft 2592000sec preferred_lft 604800sec
    inet6 fe80::20c:29ff:feee:2eba/64 scope link
       valid_lft forever preferred_lft forever
[root@tspweb01 network-scripts]#

** ② Bonding status check **

Bonding is made up of ʻens192 and ʻens224.

[root@tspweb01 network-scripts]# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: ens192 (primary_reselect better)
Currently Active Slave: ens192
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: ens192
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:ee:2e:ba
Slave queue ID: 0

Slave Interface: ens224
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:ee:2e:c4
Slave queue ID: 0
[root@tspweb01 network-scripts]#

** ③ SSH confirmation at TeraTerm **

What you can ssh.

Try dropping ʻens192 (active) `

Diagram

procedure

① Drop ʻens192`

[root@tspweb01 ~]# ifdown ens192
device'ens192'Was successfully disconnected.
[root@tspweb01 ~]#

③ Confirm that it has been switched to ʻens224`

[root@tspweb01 ~]# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: ens224
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: ens224
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:ee:2e:c4
Slave queue ID: 0
[root@tspweb01 ~]#

reference

What is bonding [What is Bonding? --IT Glossary e-Words](http://e-words.jp/w/%E3%83%9C%E3%83%B3%E3%83%87%E3%82%A3% E3% 83% B3% E3% 82% B0.html) [Linux (CentOS8 / RHEL8) Bonding mode and setting confirmation method, combination with Switch Link Aggregation setting](https://milestone-of-se.nesuke.com/nw-basic/link-aggregation/linux- bonding-and-switch-config /) Bonding on CentOS 7