Recently I installed Scientific Lunx 7.2 version and everything was fine until yesterday. Whatever I try to do with yum, it simply doesn't work. Commands like update, install, remove- they all cause same error:[norbert@localhost ~]$ sudo yum updateWczytane wtyczki: langpacksftp://ftp.scientificlinux.org/linux/scientific/7x/x86_64/os/repodata/repomd.xml: [Errno 14] curl#6 - Could not resolve host: ftp.scientificlinux.org; Odwzorowanie nazwy jest chwilowo niemoliwePrbowanie innego serwera lustrzanego.http://ftp.scientificlinux.org/linux/scientific/7x/x86_64/os/repodata/repomd.xml: [Errno 14] curl#6 - Could not resolve host: ftp.scientificlinux.org; Odwzorowanie nazwy jest chwilowo niemoliwePrbowanie innego serwera lustrzanego.http://ftp1.scientificlinux.org/linux/scientific/7x/x86_64/os/repodata/repomd.xml: [Errno 14] curl#6 - Could not resolve host: ftp1.scientificlinux.org; Odwzorowanie nazwy jest chwilowo niemoliwePrbowanie innego serwera lustrzanego.http://ftp2.scientificlinux.org/linux/scientific/7x/x86_64/os/repodata/repomd.xml: [Errno 14] curl#6 - Could not resolve host: ftp2.scientificlinux.org; Odwzorowanie nazwy jest chwilowo niemoliwePrbowanie innego serwera lustrzanego. One of the configured repositories failed (Scientific Linux 7x - x86_64), 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. Disable the repository, 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 sl     4. 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=sl.skip_if_unavailable=truefailure: repodata/repomd.xml from sl: [Errno 256] No more mirrors to try.ftp://ftp.scientificlinux.org/linux/scientific/7x/x86_64/os/repodata/repomd.xml: [Errno 14] curl#6 - Could not resolve host: ftp.scientificlinux.org; Odwzorowanie nazwy jest chwilowo niemoliwehttp://ftp.scientificlinux.org/linux/scientific/7x/x86_64/os/repodata/repomd.xml: [Errno 14] curl#6 - Could not resolve host: ftp.scientificlinux.org; Odwzorowanie nazwy jest chwilowo niemoliwehttp://ftp1.scientificlinux.org/linux/scientific/7x/x86_64/os/repodata/repomd.xml: [Errno 14] curl#6 - Could not resolve host: ftp1.scientificlinux.org; Odwzorowanie nazwy jest chwilowo niemoliwehttp://ftp2.scientificlinux.org/linux/scientific/7x/x86_64/os/repodata/repomd.xml: [Errno 14] curl#6 - Could not resolve host: ftp2.scientificlinux.org; Odwzorowanie nazwy jest chwilowo niemoliweI tried even reinstall system but then it causes this error from the begining.Can anybody tell me how to fix this?
Scientific Linux yum doesn't work
yum;scientific linux