This content originally appeared on DEV Community and was authored by Praveen Kumar K
After you have launched a minimalist CentOS 8 or CentOS 7 Amazon Machine Image (AMI) on an Amazon Elastic Compute Cloud (EC2) instance, the entire process of launching the instance goes smoothly and is successful.
But, while updating the system, using the yum update, you’re likely to get the error message:
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=genclo error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=extras&infra=genclo 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:
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. Run the command with the repository temporarily disabled
yum --disablerepo=<repoid> ...
4. 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>
or
subscription-manager repos --disable=<repoid>
5. 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
To fix this issue, Please try the following steps:
Step 1: First, go to the directory:
sudo cd /etc/yum.repos.d/
Step 2: Now, run the commands given below:
sudo sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
sudo sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
Step 3: After this, run the yum update:
sudo yum update -y
Step 4: Install any other packages that are available from the CentOS repo.
sudo yum install java -y
This content originally appeared on DEV Community and was authored by Praveen Kumar K
Praveen Kumar K | Sciencx (2024-07-24T19:56:09+00:00) Fixing Yum Update Errors on New CentOS Instances on AWS EC2. Retrieved from https://www.scien.cx/2024/07/24/fixing-yum-update-errors-on-new-centos-instances-on-aws-ec2/
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