How to update "amzn2-core/2/x86_64"
Du[ec2-user@ip-172-31-81-240 ~]$ sudo yum update Loaded plugins: extras_suggestions, langpacks, priorities, update-motd Could not retrieve mirrorlist https://amazonlinux-2-repos-us-east-1.s3.dualstack.us-east-1.amazonaws.com/2/core/latest/x86_64/mirror.list error was 14: curl#77 - "error setting certificate verify locations: CAfile: /etc/pki/tls/certs/ca-bundle.crt CApath: none" yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
Cannot find a valid baseurl for repo: amzn2-core/2/x86_64"
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:e to some reasons I went on to delete mod_ssl and later on when I tried to install again Mod_ssl I get bunch of errors I tried to troubleshoot them and in that process I suppose I deleted the "amzn2-core/2/x86_64" repo, now when I just do sudo yum update I get this error
" I have tried enabling the repo but no help. I can't run sudo yum update successfully. Please suggest how to update the repo or remove the error.
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It's likely to be one of the items in this knowledge article https://repost.aws/knowledge-center/ec2-troubleshoot-yum-errors-al1-al2
My best guess would be that the EC2 instance doesn't have outbound access on ports 80 & 443 in a security group that is associated with it. Can you verify these outbound ports are open?
If this doesn't solve the problem then look at the route table. Is the EC2 instance provisioned in the default VPC, or a VPC you have created? If the EC2 is in the default VPC then is it in a pre-existing subnet, or in a subnet you have created?
If it's in a pre-existing subnet in the default VPC then the routing should be fine, so look at other possibilities in the knowledge article.
If it's in a new subnet and/or new VPC then make sure the subnet has a route directly to an internet gateway, in AWS Console -> VPC -> Subnets -> [subnet] -> Route table and it needs to have an entry for destination 0.0.0.0/0 with target igw-abcd1234 (or if you're using a NAT Gateway then ensure this is properly setup).
Once this is confirmed to be in place, if you still can't yum update then I would advise working through the other steps in the linked knowledge article.
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