Centos 7 fix yum mirrors

Centos7-fix-mirrors.md

Shooting trouble on Centos 7 (in 2024)

https://vault.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14]
curl#35 - "Peer reports incompatible or unsupported protocol version."

Part I

on Centos 7:

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

if it works - great. close this page and go. but if not go to part II

Part II

On modern machine

1. Create dirs and Dockerfile

mkdir ~/centos7-yum-proxy
cd ~/centos7-yum-proxy
touch Dockerfile

2. Dockerfile

FROM nginx:1.26.0-alpine-slim as base
RUN echo $'server {\n\
  listen 8080;\n\
  server_name localhost;\n\
  location / {\n\
    proxy_pass https://vault.centos.org/;\n\
    proxy_ssl_server_name on;\n\
  }\n\
}' > /etc/nginx/conf.d/default.conf
EXPOSE 8080
CMD ["nginx", "-g", "daemon off;"]

3. build & run

docker build --tag fckit-proxy-centos7 .
docker run --rm -dit -p 8080:8080 --name fckit-proxy-centos7 fckit-proxy-centos7

4. checkout

docker ps

output

CONTAINER ID   IMAGE                COMMAND                CREATED         STATUS        PORTS                                               NAMES
ae767e86aef9   fckit-proxy-centos7  "/docker-entrypoint.…" 2 seconds ago   Up 1 second   80/tcp, 0.0.0.0:8080->8080/tcp, :::8080->8080/tcp   vigilant_hofstadter

on Centos 7

sed -i -e "s|mirrorlist=|#mirrorlist=|g" /etc/yum.repos.d/CentOS-*
sed -i -e "s|#baseurl=|baseurl=|g" /etc/yum.repos.d/CentOS-*
sed -i -e "s|https://vault.centos.org|http://<ip-address-of-modern-machine>:8080|g" /etc/yum.repos.d/*
yum update -y
sed -i -e "s|<ip-address-of-modern-machine>:8080|https://vault.centos.org|g" /etc/yum.repos.d/*

back to modern machine

docker kill fckit-proxy-centos7