# Switch to the network card configuration directory
cd /etc/sysconfig/network-scripts/
# Copy the network card configuration file to ifcfg-eth0
cp -a ifcfg-ens33 ifcfg-eth0
# Back up the original file to the opt directory
mv ifcfg-ens33 /opt/
# View all files in the current directory
[ root@localhost network-scripts]# ls
ifcfg-eth0 ifdown-ipv6 ifdown-TeamPort ifup-ippp ifup-routes network-functions
ifcfg-lo ifdown-isdn ifdown-tunnel ifup-ipv6 ifup-sit network-functions-ipv6
ifdown ifdown-post ifup ifup-isdn ifup-Team
ifdown-bnep ifdown-ppp ifup-aliases ifup-plip ifup-TeamPort
ifdown-eth ifdown-routes ifup-bnep ifup-plusb ifup-tunnel
ifdown-ib ifdown-sit ifup-eth ifup-post ifup-wireless
ifdown-ippp ifdown-Team ifup-ib ifup-ppp init.ipv6-global
root@localhost network-scripts]# vim ifcfg-eth0 #Modify the configuration file
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="static" #Connection mode (static/dhcp）
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="eth0" #Network card name, centos7 defaults to ens33
UUID="453ef40b-c53f-44d1-a677-d1aa1817c111"
DEVICE="eth0" #Device name, centos7 defaults to ens33
ONBOOT="yes" #Whether to load
IPADDR=192.168.233.99 #Static ip address
GATEWAY=192.168.233.2 #Gateway
NETMASK=255.255.255.0 #The writing method of subnet mask centos7 (PREFIX=24）
DNS1=180.76.76.76 #Primary DNS
DNS2=124.251.124.251 #Backup DNS
[ root@localhost ~]# source /etc/sysconfig/network-scripts/ifcfg-eth0
[ root@localhost ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 180.76.76.76
nameserver 124.251.124.251
# Modify the grub file (turn off the consistent naming rule), commonly known as the automatic discovery function
root@localhost network-scripts]# cd /etc/default/[root@localhost default]# ls
grub nss useradd
[ root@localhost default]# vim grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet net.ifnames=0 biosdevname=0"
# Add net in double quotes.ifnames=0 biosdevname=0
GRUB_DISABLE_RECOVERY="true"
[ root@localhost default]# grub2-mkconfig -o /boot/grub
grub/ grub2/[root@localhost default]# grub2-mkconfig -o /boot/grub2/grub
grub.cfg grubenv
# Update the grub configuration file and load the new parameters
[ root@localhost default]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image:/boot/vmlinuz-3.10.0-862.el7.x86_64
Found initrd image:/boot/initramfs-3.10.0-862.el7.x86_64.img
Found linux image:/boot/vmlinuz-0-rescue-ab4dc40e801c4059bf95d9a36e28d173
Found initrd image:/boot/initramfs-0-rescue-ab4dc40e801c4059bf95d9a36e28d173.img
done
[ root@localhost default]#
reboot #Restart the system
# After restarting the system, the network card name has been changed to eth0
[ root@localhost ~]# ip address show
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: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:cc:e1:91 brd ff:ff:ff:ff:ff:ff
inet 192.168.233.99/24 brd 192.168.233.255 scope global noprefixroute eth0
valid_lft forever preferred_lft forever
inet6 fe80::8d56:af45:bfeb:db65/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: virbr0:<NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:aa:fa:dd brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic:<BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:aa:fa:dd brd ff:ff:ff:ff:ff:ff
[ root@localhost ~]#
root@localhost network-scripts]# nmcli connection delete eth0
Connection 'eth0'(453ef40b-c53f-44d1-a677-d1aa1817c111) successfully deleted.
[ root@localhost network-scripts]# nmcli connection add con-name eth666 type ethernet ifname eth0 autoconnect yes
Connection 'eth666'(577dc8f5-8efa-40a3-8ecf-b2a134e2e405) successfully added.
[ root@localhost network-scripts]# nmcli connection show
NAME UUID TYPE DEVICE
Wired connection 101806e22-d18f-3434-9d4e-757711fa509a ethernet eth0
virbr0 f749af6e-b9aa-4f29-a100-4a86e68724d7 bridge virbr0
eth666 577dc8f5-8efa-40a3-8ecf-b2a134e2e405 ethernet --
[ root@localhost network-scripts]# nmcli connection modify eth666 ipv4.method auto
[ root@localhost network-scripts]# cat ifcfg-eth666
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=eth666
UUID=577dc8f5-8efa-40a3-8ecf-b2a134e2e405
DEVICE=eth0
ONBOOT=yes
[ root@localhost network-scripts]#
[ root@localhost network-scripts]# ping allms.cn
PING allms.cn.localdomain(115.159.76.237)56(84) bytes of data.64 bytes from115.159.76.237(115.159.76.237): icmp_seq=1 ttl=128 time=54.8 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=2 ttl=128 time=54.4 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=3 ttl=128 time=64.9 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=4 ttl=128 time=55.3 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=5 ttl=128 time=55.7 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=6 ttl=128 time=55.0 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=7 ttl=128 time=55.5 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=8 ttl=128 time=62.8 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=9 ttl=128 time=54.9 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=10 ttl=128 time=55.3 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=11 ttl=128 time=55.2 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=12 ttl=128 time=54.4 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=13 ttl=128 time=119 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=14 ttl=128 time=55.2 ms
64 bytes from115.159.76.237(115.159.76.237): icmp_seq=15 ttl=128 time=469 ms
^ C
- - - allms.cn.localdomain ping statistics ---15 packets transmitted,15 received,0% packet loss, time 14027ms
rtt min/avg/max/mdev =54.440/88.190/469.652/103.181 ms
[ root@localhost network-scripts]#
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