[LINUX] [ESXi (vCenter)] How to add NIC for CentOS 7.3

Introduction

This time, I would like to output how to add a CentOS 7.3 NIC on the ESXi host.

This environment

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

• CentOS 7.3 has one NIC installed.

[root@tspweb01 ~]# 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
    inet 192.168.0.41/24 brd 192.168.0.255 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 2404:7a80:91a1:4d00:20c:29ff:feee:2eba/64 scope global mngtmpaddr dynamic
       valid_lft 2591907sec preferred_lft 604707sec
    inet6 fe80::20c:29ff:feee:2eba/64 scope link
       valid_lft forever preferred_lft forever
[root@tspweb01 ~]#

Advance preparation

Shut down the OS.

(1) Check the host name and IP address. Is the target correct?

[root@tspweb01 ~]# uname -n;ip a
tspweb01
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
    inet 192.168.0.41/24 brd 192.168.0.255 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 2404:7a80:91a1:4d00:20c:29ff:feee:2eba/64 scope global mngtmpaddr dynamic
       valid_lft 2591821sec preferred_lft 604621sec
    inet6 fe80::20c:29ff:feee:2eba/64 scope link
       valid_lft forever preferred_lft forever
[root@tspweb01 ~]#

② OS shutdown

[root@tspweb01 ~]# shutdown -h now

③ Confirm that the power is off

NIC addition procedure

VM settings

① Right-click the target machine and click "Edit Settings"

② Click "Add Network Adapter"

(3) A new network adapter will be added, so select the target network.

The settings are as follows.

④ After completing the settings, click "Save".

⑥ Confirm that "Reconfig VM" becomes "normal end".

⑦ Right-click the target machine and click "Power On"

OS settings

(1) Log in to the terminal with the terminal software and check the host name and IP address.

[root@tspweb01 ~]# 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
    inet 192.168.0.41/24 brd 192.168.0.255 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 2404:7a80:91a1:4d00:20c:29ff:feee:2eba/64 scope global mngtmpaddr dynamic
       valid_lft 2591717sec preferred_lft 604517sec
    inet6 fe80::20c:29ff:feee:2eba/64 scope link
       valid_lft forever preferred_lft forever
3: ens224: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
    link/ether 00:0c:29:ee:2e:c4 brd ff:ff:ff:ff:ff:ff
[root@tspweb01 ~]#

→ Confirm that "ens224" has been added

(2) Create a network config file

[root@tspweb01 network-scripts]# vi /etc/sysconfig/network-scripts/ifcfg-ens224

** [Details] **

TYPE=Ethernet
BOOTPROTO=none
IPV6INIT=no
NAME=ens224
HWADDR=00:0c:29:ee:2e:c4
DEVICE=ens224
ONBOOT=yes
IPADDR=192.168.0.42
PREFIX=24
GATEWAY=192.168.0.1

After setting, save with "wq".

** [Settings] **

• You can check the MAC address of the NIC of ens224 with "ip addr".

3: ens224: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
    link/ether 00:0c:29:ee:2e:c4 brd ff:ff:ff:ff:ff:ff

→ The next part of "link / ether"

③ Check if the content is reflected

[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
IPADDR=192.168.0.42
PREFIX=24
GATEWAY=192.168.0.1
[root@tspweb01 network-scripts]#

④ OS shutdown

shutdown -h now

(4) Return to the ESXi screen and open Edit VM Settings.

⑤ Enter ☑ in the status of the added network adapter.

⑥ Click "Save".

⑦ Power on the target machine.

⑧ After power-on is completed, log in to the server. After logging in, check the host name and IP address.

[root@tspweb01 ~]# uname -n;ip a
tspweb01
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
    inet 192.168.0.41/24 brd 192.168.0.255 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 2404:7a80:91a1:4d00:20c:29ff:feee:2eba/64 scope global mngtmpaddr dynamic
       valid_lft 2591977sec preferred_lft 604777sec
    inet6 fe80::20c:29ff:feee:2eba/64 scope link
       valid_lft forever preferred_lft forever
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
    inet 192.168.0.42/24 brd 192.168.0.255 scope global ens224
       valid_lft forever preferred_lft forever
    inet6 2404:7a80:91a1:4d00:20c:29ff:feee:2ec4/64 scope global mngtmpaddr dynamic
       valid_lft 2591977sec preferred_lft 604777sec
    inet6 fe80::20c:29ff:feee:2ec4/64 scope link
       valid_lft forever preferred_lft forever
[root@tspweb01 ~]#

→ Confirm that the IP address set in ens224 is assigned.

⑨ Check if PING communication to the target IP address and SSH login are possible.

Reference article

About CentOS6 / 7 ifcfg and other configuration files