1.apt update

新的虛擬機，安裝git發(fā)現(xiàn)apt不能正常使用，報錯如下

Err:1 http://linux.mellanox.com/public/repo/mlnx_ofed/5.1-2.5.8.0/ubuntu18.04/amd64 ./ InRelease
  Temporary failure resolving 'linux.mellanox.com'
Err:2 https://mirrors.aliyun.com/ubuntu focal InRelease
  Temporary failure resolving 'mirrors.aliyun.com'
Err:3 https://mirrors.aliyun.com/ubuntu focal-security InRelease
  Temporary failure resolving 'mirrors.aliyun.com'
Err:4 https://mirrors.aliyun.com/ubuntu focal-updates InRelease
  Temporary failure resolving 'mirrors.aliyun.com'
Err:5 https://mirrors.aliyun.com/ubuntu focal-backports InRelease
  Temporary failure resolving 'mirrors.aliyun.com'
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: Failed to fetch https://mirrors.aliyun.com/ubuntu/dists/focal/InRelease  Temporary failure resolving 'mirrors.aliyun.com'
W: Failed to fetch https://mirrors.aliyun.com/ubuntu/dists/focal-security/InRelease  Temporary failure resolving 'mirrors.aliyun.com'
W: Failed to fetch https://mirrors.aliyun.com/ubuntu/dists/focal-updates/InRelease  Temporary failure resolving 'mirrors.aliyun.com'
W: Failed to fetch https://mirrors.aliyun.com/ubuntu/dists/focal-backports/InRelease  Temporary failure resolving 'mirrors.aliyun.com'
W: Failed to fetch http://linux.mellanox.com/public/repo/mlnx_ofed/5.1-2.5.8.0/ubuntu18.04/amd64/./InRelease  Temporary failure resolving 'linux.mellanox.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.

第一反應是考慮到apt源配置可能有問題，用vi /etc/apt/source.list打開源發(fā)現(xiàn)沒有問題，用ping測試網(wǎng)絡，ping百度報錯unkown host，ping 8.8.8.8可以通，應該是域名解析錯誤，vi /etc/resolv.conf更改nameserver，輸入兩個8.8.8.8和8.8.4.4，然后apt update可以成功了。

2.git clone 失敗

git clone https://github.com/NVIDIA/nccl.git
Cloning into 'nccl'...
fatal: unable to access 'https://github.com/NVIDIA/nccl.git/': Failed to connect to github.com port 443: No route to host

原因：服務器沒掛梯子，可能的解決辦法：文章來源地址http://www.zghlxwxcb.cn/news/detail-769817.html

更改DNS

vi /etc/resolv.conf
#輸入以下內(nèi)容 :wq退出保存
nameserver 114.114.114.114

用其他機器上傳到國內(nèi)倉庫

#在其他機器上下載并上傳到國內(nèi)倉庫
git clone https://github.com/NVIDIA/nccl-tests.git
cd nccl-tests
git remote set-url origin https://gitee.com/username/nccl-tests.git
git add .
git commit -m "initial commit"
git push -u origin master

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