1、事件描述：CentOS7下使用tree命令，發現該命令沒有被安裝，在安裝的過程中發現yum報錯
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[root@openstack-01 ~]
# tree -d
bash
: tree: 未找到命令...
[root@openstack-01 ~]
# yum -y install tree
已加載插件：fastestmirror, langpacks
Repodata is over 2 weeks old. Install yum-
cron
? Or run: yum makecache fast
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2、處理過程
a、直接執行yum makecache fast
[root@openstack-01 ~]# yum makecache fast
已加載插件：fastestmirror, langpacks
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
備注：根據它的提示信息執行操作，發現提示信息依舊
b、清除yum緩存
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[root@openstack-01 ~]
# yum clean all
已加載插件：fastestmirror, langpacks
Repodata is over 2 weeks old. Install yum-
cron
? Or run: yum makecache fast
正在清理軟件源： base centos-ceph-hammer centos-openstack-mitaka centos-qemu-ev extras updates
Cleaning up everything
Cleaning up list of fastest mirrors
[5]- 已殺死 yum update
[root@openstack-01 ~]
# yum makecache
已加載插件：fastestmirror, langpacks
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. Disable the repository, 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>
4. 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
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這時候我開始懷疑是不是我的yum所在的網絡也存在問題
c、檢測網絡連通性狀態，發現的確是網絡存在問題
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檢查了網卡配置，發現DNS配置存在一些問題，手動修改並重置網卡信息，網絡恢復正常
[root@openstack-01 ~]
# yum clean all
已加載插件：fastestmirror, langpacks
正在清理軟件源： base centos-ceph-hammer centos-openstack-mitaka centos-qemu-ev extras updates
Cleaning up everything
[root@openstack-01 ~]
# yum -y install tree
已加載插件：fastestmirror, langpacks
base | 3.6 kB 00:00:00
centos-ceph-hammer | 2.9 kB 00:00:00
centos-openstack-mitaka | 2.9 kB 00:00:00
centos-qemu-ev | 2.9 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1
/7
): centos-ceph-hammer
/7/x86_64/primary_db
| 30 kB 00:00:01
(2
/7
): extras
/7/x86_64/primary_db
| 132 kB 00:00:00
(3
/7
): updates
/7/x86_64/primary_db
| 4.9 MB 00:00:01
(4
/7
): centos-openstack-mitaka
/x86_64/primary_db
| 452 kB 00:00:04
(5
/7
): base
/7/x86_64/primary_db
| 5.3 MB 00:00:07
(6
/7
): base
/7/x86_64/group_gz
| 155 kB 00:00:15
(7
/7
): centos-qemu-ev
/7/x86_64/primary_db
| 23 kB 00:00:16
Determining fastest mirrors
* base: mirrors.zju.edu.cn
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
正在解決依賴關系
--> 正在檢查事務
---> 軟件包 tree.x86_64.0.1.6.0-10.el7 將被 安裝
--> 解決依賴關系完成
依賴關系解決
====================================================================================================================================================
Package 架構 版本 源 大小
====================================================================================================================================================
正在安裝:
tree x86_64 1.6.0-10.el7 base 46 k
事務概要
====================================================================================================================================================
安裝 1 軟件包
總下載量：46 k
安裝大小：87 k
Downloading packages:
tree-1.6.0-10.el7.x86_64.rpm | 46 kB 00:00:00
Running transaction check
Running transaction
test
Transaction
test
succeeded
Running transaction
正在安裝 : tree-1.6.0-10.el7.x86_64 1
/1
驗證中 : tree-1.6.0-10.el7.x86_64 1
/1
已安裝:
tree.x86_64 0:1.6.0-10.el7
完畢！
[root@openstack-01 ~]
# tree
.
├── anaconda-ks.cfg
├── keystonerc_admin
├── keystonerc_demo
├── packstack-answers-20160505-132946.txt
├── packstack-answers-20160505-134047.txt
├── packstack-answers-20160505-152256.txt
├── \345\205\254\345\205\261
├── \346\250\241\346\235\277
├── \350\247\206\351\242\221
├── \345\233\276\347\211\207
├── \346\226\207\346\241\243
├── \344\270\213\350\275\275
├── \351\237\263\344\271\220
└── \346\241\214\351\235\242
├── \346\234\252\345\221\275\345\220\215\346\226\207\344\273\266\345\244\271
└── \346\234\252\345\221\275\345\220\215\346\226\207\344\273\266\345\244\271\ 2
10 directories, 6 files
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