"Nelze vyřešit proxy:https; Neznámá chyba“ – chyba s „yum update“

Problém

Při provádění:

# yum update

Dojde k následující chybě:

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= ...

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 
or
subscription-manager repos --disable=

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 much
slower). If it is a very temporary problem though, this is often a nice
compromise:

yum-config-manager --save --setopt=.skip_if_unavailable=true

failed to retrieve repodata/repomd.xml from ol7_x86_64_UEKR4
error was [Errno 14] curl#5 - "Could not resolve proxy: https; Unknown error

Řešení

Chyba:„Nelze vyřešit proxy:https; Neznámá chyba“ vysvětluje, že došlo k problému se syntaxí v /etc/sysconfig/rhn/up2date konfigurační soubor pro proxy server.

V /etc/sysconfig/rhn/up2date měl uživatel níže uvedené položky pro proxy:

httpProxy=https://www-my-proxy-name:80

Ve výše uvedeném řádku je překlep „https“, pokud se jedná o HTTP proxy. Formát tohoto řádku by měl být následující:

httpProxy[comment]=HTTP proxy in host:port format, e.g. squid.example.com:3128

Změňte https na http a poté zopakujte aktualizaci yum.