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

$root@k1 yum.repos.d$ # ll

total 44

-rw-r--r--. 1 root root 839 Sep 19 13:47 ali.repo

-rw-r--r--. 1 root root 1664 Oct 23 2020 CentOS-Base.repo

-rw-r--r--. 1 root root 1309 Oct 23 2020 CentOS-CR.repo

-rw-r--r--. 1 root root 649 Oct 23 2020 CentOS-Debuginfo.repo

-rw-r--r--. 1 root root 314 Oct 23 2020 CentOS-fasttrack.repo

-rw-r--r--. 1 root root 630 Oct 23 2020 CentOS-Media.repo

-rw-r--r--. 1 root root 1331 Oct 23 2020 CentOS-Sources.repo

-rw-r--r--. 1 root root 8515 Oct 23 2020 CentOS-Vault.repo

-rw-r--r--. 1 root root 616 Oct 23 2020 CentOS-x86_64-kernel.repo

$root@k1 yum.repos.d$ # sudo yum clean all

sudo yum makecache

sudo yum update

Loaded plugins: fastestmirror

Repository base is listed more than once in the configuration

Repository updates is listed more than once in the configuration

Repository extras is listed more than once in the configuration

Repository centosplus is listed more than once in the configuration

Cleaning repos: base extras updates

Cleaning up list of fastest mirrors

$root@k1 yum.repos.d$ # sudo yum makecache

Loaded plugins: fastestmirror

Repository base is listed more than once in the configuration

Repository updates is listed more than once in the configuration

Repository extras is listed more than once in the configuration

Repository centosplus is listed more than once in the configuration

Determining fastest mirrors

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; Unknown error"

One of the configured repositories failed (Unknown),

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:

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

Run the command with the repository temporarily disabled

yum --disablerepo=<repoid> ...

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>

subscription-manager repos --disable=<repoid>

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

$root@k1 yum.repos.d$ # sudo yum update

Loaded plugins: fastestmirror

Repository base is listed more than once in the configuration

Repository updates is listed more than once in the configuration

Repository extras is listed more than once in the configuration

Repository centosplus is listed more than once in the configuration

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; Unknown error"

One of the configured repositories failed (Unknown),

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:

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

Run the command with the repository temporarily disabled

yum --disablerepo=<repoid> ...

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>

subscription-manager repos --disable=<repoid>

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

$root@k1 yum.repos.d$ #

$root@k1 yum.repos.d$ # ll

total 44

-rw-r--r--. 1 root root 839 Sep 19 13:47 ali.repo

-rw-r--r--. 1 root root 1664 Oct 23 2020 CentOS-Base.repo

-rw-r--r--. 1 root root 1309 Oct 23 2020 CentOS-CR.repo

-rw-r--r--. 1 root root 649 Oct 23 2020 CentOS-Debuginfo.repo

-rw-r--r--. 1 root root 314 Oct 23 2020 CentOS-fasttrack.repo

-rw-r--r--. 1 root root 630 Oct 23 2020 CentOS-Media.repo

-rw-r--r--. 1 root root 1331 Oct 23 2020 CentOS-Sources.repo

-rw-r--r--. 1 root root 8515 Oct 23 2020 CentOS-Vault.repo

-rw-r--r--. 1 root root 616 Oct 23 2020 CentOS-x86_64-kernel.repo

$root@k1 yum.repos.d$ # yum list java*