Centos 8 appstream error - Исправление ошибок и поиск оптимальных решений проблем

I had installed a minimalist CentOS 8 on one of my servers. Installation went successful, however, when I tried to update the system using yum update I see this error message: Failed to download metadata for repo. Below is the complete error.

[root@autocontroller ~]# yum update
CentOS-8 - AppStream 70 B/s | 38 B 00:00
Error: Failed to download metadata for repo 'AppStream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

Output from the /var/log/dnf.log for more DEBUG information:

2022-02-02T11:39:36Z DEBUG error: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org] (http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock).
2022-02-02T11:39:36Z WARNING Errors during downloading metadata for repository 'AppStream':
- Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org]
2022-02-02T11:39:36Z DDEBUG Cleaning up.
2022-02-02T11:39:36Z SUBDEBUG
Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 573, in load
ret = self._repo.load()
File "/usr/lib64/python3.6/site-packages/libdnf/repo.py", line 394, in load
return _repo.Repo_load(self)
RuntimeError: Failed to download metadata for repo 'AppStream': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org]

But, then verified with the internet connection and DNS and it works just fine as below:

[root@autocontroller ~]# ping google.com
PING google.com (172.217.166.206) 56(84) bytes of data.
64 bytes from del03s13-in-f14.1e100.net (172.217.166.206): icmp_seq=1 ttl=115 ti me=43.5 ms
--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 43.508/43.508/43.508/0.000 ms

So how did I fix the issue? Here it is.

CentOS Linux 8 had reached the End Of Life (EOL) on December 31st, 2021. It means that CentOS 8 will no longer receive development resources from the official CentOS project. After Dec 31st, 2021, if you need to update your CentOS, you need to change the mirrors to vault.centos.org where they will be archived permanently. Alternatively, you may want to upgrade to CentOS Stream.

Step 1: Go to the /etc/yum.repos.d/ directory.

[root@autocontroller ~]# cd /etc/yum.repos.d/

Step 2: Run the below commands

[root@autocontroller ~]# sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*

[root@autocontroller ~]# sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

Step 3: Now run the yum update

[root@autocontroller ~]# yum update -y

That’s it!

Ramya Santhosh

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I am trying to download java using yum on centOs which I specified in Dockerfile.
After pulling centOs image the run crushed and throw this error!?
also to mention that my server instance is AWS EC2!

Step 2/9 : RUN yum install java -y
 ---> Running in 39fc233aa965
CentOS Linux 8 - AppStream                      184  B/s |  38  B     00:00
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
The command '/bin/sh -c yum install java -y' returned a non-zero code: 1

asked Feb 2, 2022 at 23:01

Try editing your dockerfile

FROM centos

RUN cd /etc/yum.repos.d/
RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
RUN sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

RUN yum -y install java

CMD /bin/bash

Refer to this code

failed-metadata-repo-appstream-centos-8

answered Mar 1, 2022 at 13:28

BigCatBigCat

1,2611 gold badge2 silver badges4 bronze badges

If you don’t already have it, you’ll need the gpg keys:

wget 'http://mirror.centos.org/centos/8-stream/BaseOS/x86_64/os/Packages/centos-gpg-keys-8-3.el8.noarch.rpm'
sudo rpm -i 'centos-gpg-keys-8-3.el8.noarch.rpm'

Then it’s as simple as transitioning like so:

dnf --disablerepo '*' --enablerepo=extras swap centos-linux-repos centos-stream-repos

Don’t worry — it doesn’t remove any repos, it simply temporarily ignores all of yours, and downloads information regarding the new mirrors.

You may at this point want to actually upgrade your packages:

sudo dnf distro-sync

You’ll now be able to use «yum» as usual.

answered Feb 7, 2022 at 14:44

HashbrownHashbrown

11.6k8 gold badges71 silver badges90 bronze badges

Go to /etc/yum.repos.d/

cd /etc/yum.repos.d/

Run

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-*
sudo yum update -y

Then do what you want

answered Apr 24, 2022 at 2:39

wsdzbmwsdzbm

2,8093 gold badges23 silver badges26 bronze badges

I tried to use CentOS 8 with wsl and got the same error. Steps to fix the problem (as root):

# sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
# sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
# dnf distro-sync
# dnf -y install java

The top voted answer did not work for me (by @Hashbrown). The answer with Dockerfile was not for my case either.

answered Mar 23, 2022 at 11:16

Use these commands to update centOS8.0 on AWS EC2:

sudo sed -i -e "s|mirrorlist=|#mirrorlist=|g" 
    -e "s|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g" 
        /etc/yum.repos.d/CentOS-*

tripleee

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answered Jun 16, 2022 at 8:49

sfl0r3nz05sfl0r3nz05

3875 silver badges12 bronze badges

CentOS 8 reached EOL on 2021-12-31 (announcement).

Therefor, the URLs to the mirrors don’t work anymore. Instead of using sed to modify the URLs to point to the archived mirrors, CentOS officially recommends to convert from CentOS Linux 8 to CentOS Stream 8 via:

dnf --disablerepo '*' --enablerepo extras swap centos-linux-repos centos-stream-repos
dnf distro-sync

After that, dnf/yum will work again.

answered Aug 1, 2022 at 6:44

stackprotectorstackprotector

8,9474 gold badges29 silver badges58 bronze badges

Try this

FROM centos

RUN cd /etc/yum.repos.d/
RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
RUN sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

RUN yum -y install java

CMD /bin/bash

answered Mar 23, 2022 at 22:16

Please follow the below-mentioned steps:

Go to the /etc/yum.repos.d/ directory.

cd /etc/yum.repos.d/
Run the below commands to hash the mirror-list in all yum.repos.d files then replace the existed Baseurl with the vault.centos.org

sed -i ‘s/mirrorlist/#mirrorlist/g’ /etc/yum.repos.d/CentOS-*
sed -i ‘s|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g’ /etc/yum.repos.d/CentOS-*
Then run yum update or install any package you want

yum update -y

answered May 30, 2022 at 8:35

MahmudMahmud

1111 silver badge7 bronze badges

Update your docker file with below. It should work.

    RUN  sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
    RUN  sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
    RUN yum update -y

answered Jan 5 at 19:21

viratpuarviratpuar

5141 gold badge5 silver badges22 bronze badges

Go to /etc/yum.repos.d/ directory. Open .repo file and manually edit mirrorlist from $releasever to 8-stream.

For example : /etc/yum.repos.d/CentOS-Linux-BaseOS.repo

open file in vi

sudo vi /etc/yum.repos.d/CentOS-Linux-BaseOS.repo
comment mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=BaseOS&infra=$infra

#mirrorlist=http://......
within vi, copy paste mirrorlist=http://...... line

yy and p
uncomment and edit the copied line by replacing $releasever to 8-stream

mirrorlist=http://mirrorlist.centos.org/?release=8-stream&arch=$basearch&repo=BaseOS&infra=$infra
save and exit vi

:wq

Repeat above 5-steps for other .repo files.

answered Apr 15, 2022 at 11:02

SathishSathish

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При попытке обновить или установить пакеты из репозиториев CentOS 8 выдается следующая ошибка: «Ошибка: Не удалось загрузить метаданные для репозитория ?appstream?: Cannot prepare internal mirrorlist: No URLs in mirrorlist«.

На самом деле об этом предупреждали заранее разработчики CentOS, конкретнее от отказа разработки версий ОС и переход на Stream версию, подробнее об этом можно прочитать тут.

Чтоб решить проблему с скачиванием нужных пакетов из официальных репозиториев, нужно перенаправить свои репозитории /etc/yum.repos.d/ на http://vault.centos.org вместо http://mirror.centos.org. Делается это следующим образом:

sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Linux-*
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-Linux-*

После чего репозитории будут доступны, но вы не будете получать обновления безопасности, т.к. CentOS 8 официально умерла 31.12.21. Но вы можете перейти на SentOS Stream, выполнив следующие команды:

dnf --disablerepo '*' --enablerepo extras swap centos-linux-repos centos-stream-repos
dnf distro-sync

После чего возможно потребуется перезагрузка. Более подробную информацию о переходе на centos strem можно получить тут.

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Если вы столкнулись со следующей ошибкой в CentOS 8 при попытке обновить пакеты с помощью dnf update или yum update в этом руководстве мы исправим эту проблему.

Исправление в CentOS 8: “Ошибка: Failed to download metadata for repo appstream”

Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

Исправление: Переход на CentOS Stream 8 или альтернативный дистрибутив

Пользователи CentOS переходят на альтернативные дистрибутивы CentOS, потому что CentOS перешла на Stream – дистрибутив Linux, который находится на полпути между разработкой Fedora и разработкой RHEL.

Другие перешли на CentOS Stream 8, чтобы остаться с CentOS.

Оба этих варианта позволят вам обновить CentOS 8, несмотря на то, что вы не можете этого сделать напрямую.

Переход с CentOS 8 на CentOS Stream 8:

dnf --disablerepo '*' --enablerepo=extras swap centos-linux-repos centos-stream-repos

dnf distro-sync

Это поможет вам решить проблему, с которой вы столкнулись при обновлении пакетов или установке новых.

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I’m on a fresh Centos 8 install and have tried to use yum for the first time (on this machine). I get the following for any attempt to install or update anything:

yum update
CentOS-8 - AppStream                            0.0  B/s |   0  B     00:00    
Failed to download metadata for repo 'AppStream'
Error: Failed to download metadata for repo 'AppStream'

Port 80 is open although nmap reports it as closed presumably because I haven’t yet installed apache. To be double sure I have added port 80 to firewalld which is confirmed:

firewall-cmd --list-ports
25/tcp 80/tcp

I have tried various advice like yum clean and clearing the yum cache but nothing helps.

This is what is in the dnf.log:

2020-03-30T19:33:01Z INFO --- logging initialized ---
2020-03-30T19:33:01Z DDEBUG timer: config: 4 ms
2020-03-30T19:33:01Z DEBUG Loaded plugins: builddep, changelog, config-manager, copr, debug, debuginfo-install, download, generate_completion_cache, needs-restarting, playground, repoclosure, repodiff, repograph, repomanage, reposync
2020-03-30T19:33:01Z DEBUG DNF version: 4.2.7
2020-03-30T19:33:01Z DDEBUG Command: yum install httpd 
2020-03-30T19:33:01Z DDEBUG Installroot: /
2020-03-30T19:33:01Z DDEBUG Releasever: 8
2020-03-30T19:33:01Z DEBUG cachedir: /var/cache/dnf
2020-03-30T19:33:01Z DDEBUG Base command: install
2020-03-30T19:33:01Z DDEBUG Extra commands: ['install', 'httpd']
2020-03-30T19:33:01Z DEBUG repo: downloading from remote: AppStream
2020-03-30T19:33:02Z DEBUG error: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org] (http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock).
2020-03-30T19:33:02Z DEBUG Cannot download 'http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org].
2020-03-30T19:33:02Z ERROR Failed to download metadata for repo 'AppStream'
2020-03-30T19:33:02Z DDEBUG Cleaning up.
2020-03-30T19:33:02Z SUBDEBUG 
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 552, in load
    ret = self._repo.load()
  File "/usr/lib64/python3.6/site-packages/libdnf/repo.py", line 394, in load
    return _repo.Repo_load(self)
RuntimeError: Failed to download metadata for repo 'AppStream'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 65, in main
    return _main(base, args, cli_class, option_parser_class)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 98, in _main
    return cli_run(cli, base)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 114, in cli_run
    cli.run()
  File "/usr/lib/python3.6/site-packages/dnf/cli/cli.py", line 1134, in run
    self._process_demands()
  File "/usr/lib/python3.6/site-packages/dnf/cli/cli.py", line 832, in _process_demands
    load_available_repos=self.demands.available_repos)
  File "/usr/lib/python3.6/site-packages/dnf/base.py", line 406, in fill_sack
    self._add_repo_to_sack(r)
  File "/usr/lib/python3.6/site-packages/dnf/base.py", line 136, in _add_repo_to_sack
    repo.load()
  File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 558, in load
    raise dnf.exceptions.RepoError(str(e))
dnf.exceptions.RepoError: Failed to download metadata for repo 'AppStream'
2020-03-30T19:33:02Z CRITICAL Error: Failed to download metadata for repo 'AppStream'

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