[linux] 업데이트(update) Centos7.4 to 7.9

7.4에서 7.9로 업데이트

 

yum clean all

reboot

yum upgrade

 

 .................................

 

Error:  Multilib version problems found. This often means that the root
    cause is something else and multilib version checking is just
    pointing out that there is a problem. Eg.:

      1. You have an upgrade for systemd-libs which is missing some
         dependency that another package requires. Yum is trying to
         solve this by installing an older version of systemd-libs of the
         different architecture. If you exclude the bad architecture
         yum will tell you what the root cause is (which package
         requires what). You can try redoing the upgrade with
         --exclude systemd-libs.otherarch ... this should give you an error
         message showing the root cause of the problem.

      2. You have multiple architectures of systemd-libs installed, but
         yum can only see an upgrade for one of those architectures.
         If you don't want/need both architectures anymore then you
         can remove the one with the missing update and everything
         will work.

      3. You have duplicate versions of systemd-libs installed already.
         You can use "yum check" to get yum show these errors.

    ...you can also use --setopt=protected_multilib=false to remove
    this checking, however this is almost never the correct thing to
    do as something else is very likely to go wrong (often causing
    much more problems).

    Protected multilib versions:...........................................
    .......................................................................
    .........................................

업그레이드 하다가 이런오류가나면

 

package-cleanup --dupes

yum update --skip-broken --setopt=protected_multilib=false

reboot

 

위 명령어를 입력하면 업데이트에 성공한다.(아마도?)