CentOS Question posted in
The official documentation can be found here.

Can install docker with yum on centos 7

I am following the steps shown here.

It says to setup a repository by calling:

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

Then install by running:

sudo yum install docker-ce docker-ce-cli containerd.io

When I do that I get the following error:

https://download.docker.com/linux/centos/7Server/x86_64/stable/repodata/repomd.xml: [Errno 14] HTTPS Error 404 – Not Found

When I go to that URL, it is a 404. But I am unsure on what the correct URL should be and what to do to get it to use the correct URL.

I am open to any advice on how to get this working.

Update:
Exploring a bit more I found that this URL is probably the one I need to use:
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml

But I don’t know how to get it to use that.

Update 2:
Downloading the file at https://download.docker.com/linux/centos/docker-ce.repo (from the first command) showed that it was getting the 7Server value from a yum variable called $releasever.

This page indicates that $releasever is read from /etc/yum.conf in the setting distroverpkg. I added a line like this: distroverpkg=7.

But when I ran the install command again, 7Server was replaced by $releasever directly (no substitution happened). The 7 value I was looking for was not substituted in there.

Still stuck on how to get this to download and install docker.

Update 3:
I was able to add a file called releasever to /etc/yum/vars with the value of 7 in it. When I ran the install command again, it found the repository correctly!

But then it needed to load another URL that broke. It looked like that URL wanted 7Server instead of 7 as the releasever variable.

Looks like I am out of luck 🙁

Tags:

3

Answers


  1. Chosen as BEST ANSWER
    0

    This is an issue with download.docker.com that they have had open since September.

    Basically they decided to retire the 7Server urls. They redirect to the plain 7 for the url https://download.docker.com/linux/centos/7Server, but not for any deeper urls.

    The workaround is to call this:

    sudo yum-config-manager --setopt="docker-ce-stable.baseurl=https://download .docker.com/linux/centos/7/x86_64/stable" --save

    Before you call the sudo yum install command.


  2. 0

    Due to the test on a fresh centos7, I think the problem is not docker.

    Also if I search repomd.xml I found that is a commmon problem in centos when you try to install another tools:

    Error: Cannot retrieve repository metadata (repomd.xml)

    As you will see in the question, the problem is related to rare behaviors in the centos s.o like: repos, certificates, updates, etc

    Maybe this helps you:

    yum clean all
yum check
yum erase apf
yum update ca-certificates
yum upgrade

    Also If you don’t want a headache, delete your centos and create a new one!

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  3. 0

    do this for centos 7
    go to cd /etc/yum.repos.d/
    and delete all other repositories except centos related repositories.
    goto docker official website and follow the install instructions again.
    It works for me

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