What to do if you get an error saying Cannot find a valid baseurl for repo when you use yum -y install docker in a udemy course using CentOS7

Status

udemy Docker starting with Linux commands-BE A FIRST PENGUIN AND GROW AS WHALE https://www.udemy.com/course/linuxdocker-be-a-first-penguin-and-grow-as-whale/learn/lecture/16684274#questions/12224904 Section 3-15

After installing CentOS

# yum -y install docker

When you do

Cannot find a valid baseurl for repo

I got an error. If you install CentOS as it is, you may not be able to use the yum command. At least that was the case with the CentOS 7.8.2003 I used.

environment

Install Linux (CentOS7.8.2003) on VirtualBox on mac Performed all operations as root user

After installing CentOS, I got an error when trying to install docker

# yum -y install docker

スクリーンショット 2020-09-05 23.55.35.png

1. Change the description of ONBOOT and set DNS

Open the following.

# vi /etc/sysconfig/network-scripts/ifcfg-？？？

??? is

# cd /etc/sysconfig/network-scripts
# ls

Please check your directory and enter it. In my case, there were two, ifcfg-enp0s3 and ifcfg-enp0s8, but only ifcfg-enp0s3 is used.

Change the description of ONBOOT from "no" to "yes" at the opened destination, and describe the DNS settings.

ONBOOT=yes

DNS1=8.8.8.8
DNS2=8.8.4.4

2. Reboot

After completing the settings, restart.

# systemctl restart network

If all else fails, try restarting Linux.

3. Confirmation

I will check the operation just in case. I tried to update it.

# yum update

It worked properly. スクリーンショット 2020-09-08 12.47.56.png

4. Install Docker

# yum -y install docker

I was able to download it safely. スクリーンショット 2020-09-08 13.16.13.png

If it doesn't work, rewrite the baseurl

If it still doesn't work as expected, there may be a problem with the baseurl.

# vi /etc/yum.repos.d/CentOS-Base.repo

initial state スクリーンショット 2020-09-05 23.57.15.png

Change all baseurls to the following description.

#baseurl=http://ftp-srv2.kddilabs.jp/Linux/packages/CentOS/7.8.2003/os/x86_64/

After editing スクリーンショット 2020-09-05 23.59.45.png

Please set with the URL of the version you are using. I am from the following site https://blog.77jp.net/linux-iso%E3%82%A4%E3%83%A1%E3%83%BC%E3%82%B8-%E3%81%AE%E3%83%80%E3%82%A6%E3%83%B3%E3%83%AD%E3%83%BC%E3%83%89%E3%82%B5%E3%82%A4%E3%83%88%E5%9B%BD%E5%86%85%E3%83%9F%E3%83%A9%E3%83%BC

http://ftp-srv2.kddilabs.jp/Linux/packages/CentOS/ Open My version ➡︎ os / ➡︎ x86_64 / And the opened URL is set to baseurl.

reference

https://mebee.info/2020/03/21/post-7689/ https://qiita.com/ntkgcj/items/fd8588dcd65a42c34875

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