centOS7位址設為靜态和無法聯網下載下傳問題

centOS7 系統的ip位址設定為靜态

路徑一般是一樣的

vi /etc/sysconfig/network-scripts/ifcfg-ens33

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static //代表靜态  BOOTPROTO=dhcp 代表動态擷取
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=ens33
UUID=0b3ac35f-a121-4b3f-8120-41037d1d7ef1
DEVICE=ens33
ONBOOT=yes //屬性設定為yes 一般都有 沒有添加
IPADDR=192.168.136.128  //ip位址
GATEWAY=192.168.136.2   //網關 不知道網關的可以使用 cat /etc/resolv.conf 指令 列印出的就是網關了
NETMASK=255.255.255.0   //子網路遮罩 
DNS1 = 192.168.136.2    // DNS
           

重新開機網卡之後使用 ifconfig 發現

-bash: ifconfig: 未找到指令
           

centOS7 自帶的 ip addr 是可以用的

[[email protected] ~]# ip addr
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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:91:e9:d8 brd ff:ff:ff:ff:ff:ff
    inet 192.168.136.128/24 brd 192.168.136.255 scope global noprefixroute dynamic ens33
       valid_lft 1369sec preferred_lft 1369sec
    inet6 fe80::21b7:e8b9:2906:d44a/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::3f5c:e9e6:73ba:241a/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
           

我也忘記我是不是重新開機網絡了：可以先試試重新開機網絡然後在使用 yum 指令 如果可以那下面的錯誤也就不用在意了

後來發現可能是沒有安裝 net-tools

安裝的時候就出現了以下錯誤:

[root@zhang002 ~]# yum install net-tools
已加載插件：fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; 未知的錯誤"


 One of the configured repositories failed (未知),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Run the command with the repository temporarily disabled
            yum --disablerepo=<repoid> ...

     4. Disable the repository permanently, so yum won't use it by default. Yum
        will then just ignore the repository until you permanently enable it
        again or use --enablerepo for temporary usage:

            yum-config-manager --disable <repoid>
        or
            subscription-manager repos --disable=<repoid>

     5. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64
           

這種錯誤的原因是沒連上網 設定成靜态ip 無法通路網絡了 BOOTPROTO=static

設定成從static變成dhcp就可以了