CentOS 6.9 eth setting

##  CentOS 6.9 eth setting

    **  "cat /etc/sysconfig/network-scripts/ifcfg-eth0"
   
    DEVICE=eth0
    HWADDR=00:30:18:00:e1:65
    TYPE=Ethernet
    UUID=87093b7d-de84-4418-bbdd-a49f21a0be9d
    ONBOOT=yes
    NM_CONTROLLED=yes
    BOOTPROTO=none
    USERCTL=no
    PEERDNS=yes
    IPV6INIT=no
    IPADDR=10.10.8.190
    GATEWAY=10.10.8.254
    NETMASK=255.255.255.0
    DNS1=10.10.0.9
    DNS2=10.10.0.10
 
##  DNS 設定
   
    /etc/hosts ：這個是最早的 hostname 對應 IP 的檔案；
    /etc/resolv.conf ：這個重要！就是 ISP 的 DNS 伺服器 IP 記錄處；
    /etc/nsswitch.conf：這個檔案則是在『決定』先要使用 /etc/hosts 還是 /etc/resolv.conf 的設定！
   
    "vim /etc/resolv.conf"
    nameserver 168.95.1.1
    nameserver 139.175.10.20
   
##  CentOS 新增網卡
    **找出目前所有網卡
    dmesg | grep -in eth
    387:[    2.074571] e1000 0000:00:03.0 eth0: (PCI:33MHz:32-bit) 08:00:27:37:d5:5a
    388:[    2.074587] e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection
    412:[    2.571363] e1000 0000:00:08.0 eth1: (PCI:33MHz:32-bit) 08:00:27:03:28:44
    413:[    2.571371] e1000 0000:00:08.0 eth1: Intel(R) PRO/1000 Network Connection
    417:[    2.588359] systemd-udevd[244]: renamed network interface eth1 to enp0s8
    420:[    2.597290] systemd-udevd[241]: renamed network interface eth0 to enp0s3
     
    **找出新網卡 mac address
    ifconfig
    enp0s3: flags=4163  mtu 1500
            inet 192.168.56.101  netmask 255.255.255.0  broadcast 192.168.56.255
            inet6 fe80::a00:27ff:fe37:d55a  prefixlen 64  scopeid 0x20
            ether 08:00:27:37:d5:5a  txqueuelen 1000  (Ethernet)
            RX packets 6911  bytes 3960745 (3.7 MiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 6048  bytes 1263062 (1.2 MiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
       
    **產生新網卡的 UUID
    # uuidgen enp0s8
    297daa1e-a83d-471e-b70d-83eafb2f2470


    **產生新網卡的 eth-scripts
    cd /etc/sysconfig/network-scripts/
    # cp ifcfg-enp0s3 ifcfg-enp0s8

    AME、UUID、DEVICE、HWADDR修改為新網卡資料
    # vi ifcfg-enp0s8
    TYPE=Ethernet
    BOOTPROTO=dhcp
    DEFROUTE=yes
    IPV4_FAILURE_FATAL=no
    IPV6INIT=yes
    IPV6_AUTOCONF=yes
    IPV6_DEFROUTE=yes
    IPV6_FAILURE_FATAL=no
    NAME=enp0s8
    UUID=297daa1e-a83d-471e-b70d-83eafb2f2470
    DEVICE=enp0s8
    HWADDR=08:00:27:03:28:44
    ONBOOT=yes
    PEERDNS=yes
    PEERROUTES=yes
    IPV6_PEERDNS=yes
    IPV6_PEERROUTES=yes