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*nmcli 設定網卡

  1. 查看網卡，除了 lo 外，有一張網卡 ens3。 
    [root@kvm7 ~]# nmcli device show 
GENERAL.DEVICE:                         ens3
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         52:54:00:B4:0A:A3
GENERAL.MTU:                            1500
GENERAL.STATE:                          30 (disconnected)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
WIRED-PROPERTIES.CARRIER:               on

GENERAL.DEVICE:                         lo
GENERAL.TYPE:                           loopback
GENERAL.HWADDR:                         00:00:00:00:00:00
GENERAL.MTU:                            65536
GENERAL.STATE:                          10 (unmanaged)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
IP4.ADDRESS[1]:                         ip = 127.0.0.1/8, gw = 0.0.0.0
IP6.ADDRESS[1]:                         ip = ::1/128, gw = ::
  2. 查詢 ens3 網卡設定為 dhcp。 
    [root@kvm7 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens3
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=ens3
UUID=e08e9bff-28d9-4ee3-8215-034a103a474e
DEVICE=ens3
ONBOOT=yes
  3. 刪除 ens3 網卡的連線，實際上是刪除網卡設定檔 /etc/sysconfig/network-script/ifcfg-ens3。 
    [root@kvm7 ~]# nmcli connection delete ens3 
[root@kvm7 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens3
cat: /etc/sysconfig/network-scripts/ifcfg-ens3: No such file or directory
  4. 增加 ens3 網卡的連線 ip 192.168.122.7，遮罩 255.255.255.0，閘道 192.168.122.1。 
    [root@kvm7 ~]# nmcli connection add con-name ens3 type ethernet ifname ens3 ip4 192.168.122.7/24 gw4 192.168.122.1
Connection 'ens3' (69bf76bb-71d3-4704-8b04-f09e21d9796d) successfully added.
  5. 實際上是編輯網卡設定檔 /etc/sysconfig/network-script/ifcfg-ens3。 
    [root@kvm7 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens3
TYPE=Ethernet
BOOTPROTO=none
IPADDR0=192.168.122.7
PREFIX0=24
GATEWAY0=192.168.122.1
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=ens3
UUID=69bf76bb-71d3-4704-8b04-f09e21d9796d
DEVICE=ens3
ONBOOT=yes
inactive
  6. 成功啟動 ens3 網卡的連線。 
    [root@kvm7 ~]# nmcli connection up ens3
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/2)
  7. 查看 ens3 ip 與設定相同。 
    [root@kvm7 ~]# ip addr show ens3 
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:b4:0a:a3 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.7/24 brd 192.168.122.255 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:feb4:aa3/64 scope link 
       valid_lft forever preferred_lft forever
  8. 查看 ens3 連線詳細狀況，其中 DNS 沒設定。 
    [root@kvm7 ~]# nmcli connection show ens3
connection.id:                          ens3
connection.uuid:                        69bf76bb-71d3-4704-8b04-f09e21d9796d
connection.interface-name:              ens3
connection.type:                        802-3-ethernet
connection.autoconnect:                 yes
connection.timestamp:                   1408114329
connection.read-only:                   no
connection.permissions:                 
connection.zone:                        --
connection.master:                      --
connection.slave-type:                  --
connection.secondaries:                 
connection.gateway-ping-timeout:        0
802-3-ethernet.port:                    --
802-3-ethernet.speed:                   0
802-3-ethernet.duplex:                  --
802-3-ethernet.auto-negotiate:          yes
802-3-ethernet.mac-address:             --
802-3-ethernet.cloned-mac-address:      --
802-3-ethernet.mac-address-blacklist:   
802-3-ethernet.mtu:                     auto
802-3-ethernet.s390-subchannels:        
802-3-ethernet.s390-nettype:            --
802-3-ethernet.s390-options:            
ipv4.method:                            manual
ipv4.dns:                               
ipv4.dns-search:                        
ipv4.addresses:                         { ip = 192.168.122.7/24, gw = 192.168.122.1 }
ipv4.routes:                            
ipv4.ignore-auto-routes:                no
ipv4.ignore-auto-dns:                   no
ipv4.dhcp-client-id:                    --
ipv4.dhcp-send-hostname:                yes
ipv4.dhcp-hostname:                     --
ipv4.never-default:                     no
ipv4.may-fail:                          yes
ipv6.method:                            auto
ipv6.dns:                               
ipv6.dns-search:                        
ipv6.addresses:                         
ipv6.routes:                            
ipv6.ignore-auto-routes:                no
ipv6.ignore-auto-dns:                   no
ipv6.never-default:                     no
ipv6.may-fail:                          yes
ipv6.ip6-privacy:                       -1 (unknown)
ipv6.dhcp-hostname:                     --
GENERAL.NAME:                           ens3
GENERAL.UUID:                           69bf76bb-71d3-4704-8b04-f09e21d9796d
GENERAL.DEVICES:                        ens3
GENERAL.STATE:                          activated
GENERAL.DEFAULT:                        yes
GENERAL.DEFAULT6:                       no
GENERAL.VPN:                            no
GENERAL.ZONE:                           --
GENERAL.DBUS-PATH:                      /org/freedesktop/NetworkManager/ActiveConnection/2
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/Settings/6
GENERAL.SPEC-OBJECT:                    --
GENERAL.MASTER-PATH:                    --
IP4.ADDRESS[1]:                         ip = 192.168.122.7/24, gw = 192.168.122.1
IP6.ADDRESS[1]:                         ip = fe80::5054:ff:feb4:aa3/64, gw = ::
active
  9. ens3 連線設定 dns 192.168.122.1。 
    [root@kvm7 ~]# nmcli connection modify ens3 ipv4.dns 192.168.122.1
  10. 設定 dns 後，可以再次啟動 ens3 網卡的連線，以確保 dns 生效。 
    [root@kvm7 ~]# nmcli connection up ens3
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/2)
  11. 再查看 ipv4 的 DNS 為 192.168.122.1。 
    [root@kvm7 ~]# nmcli connection show ens3 | grep dns
ipv4.dns:                               192.168.122.1
ipv4.dns-search:                        
ipv4.ignore-auto-dns:                   no
ipv6.dns:                               
ipv6.dns-search:                        
ipv6.ignore-auto-dns:                   no
  12. 設定網路連線度操作示範


2015-12-04