[centos][yum] centos升级到特定版本
我们已知，yum upgrade命令可以将整个系统升级到最新版本。
但是很多时候，我们需要更新到指定版本，比如，当前最新的CentOS版本是7.6.1810
但是我需要更新到7.4，可以如下这样做：
1. CentOS的repo是不维护历史版本的。所有历史版本都在这里，
在OS里，有这样的一个repo， /etc/yum.repos.d/CentOS-Vault.repo
里边是，当前版本之前的历史版本。所以里边没有7.4 。
2. 更新centos-release包，拿到7,4的vault
yum install centos-release
3 查看所有可用的repo
yum repolist all
详见：
repo id repo name status
C7.0.1406-base/x86_64 CentOS-7.0. - Base disabled
C7.0.1406-centosplus/x86_64 CentOS-7.0. - CentOSPlus disabled
C7.0.1406-extras/x86_64 CentOS-7.0. - Extras disabled
C7.0.1406-fasttrack/x86_64 CentOS-7.0. - Fasttrack disabled
C7.0.1406-updates/x86_64 CentOS-7.0. - Updates disabled
C7.1.1503-base/x86_64 CentOS-7.1. - Base disabled
C7.1.1503-centosplus/x86_64 CentOS-7.1. - CentOSPlus disabled
C7.1.1503-extras/x86_64 CentOS-7.1. - Extras disabled
C7.1.1503-fasttrack/x86_64 CentOS-7.1. - Fasttrack disabled
C7.1.1503-updates/x86_64 CentOS-7.1. - Updates disabled
C7.2.1511-base/x86_64 CentOS-7.2. - Base disabled
C7.2.1511-centosplus/x86_64 CentOS-7.2. - CentOSPlus disabled
C7.2.1511-extras/x86_64 CentOS-7.2. - Extras disabled
C7.2.1511-fasttrack/x86_64 CentOS-7.2. - Fasttrack disabled
C7.2.1511-updates/x86_64 CentOS-7.2. - Updates disabled
C7.3.1611-base/x86_64 CentOS-7.3. - Base disabled
C7.3.1611-centosplus/x86_64 CentOS-7.3. - CentOSPlus disabled
C7.3.1611-extras/x86_64 CentOS-7.3. - Extras disabled
C7.3.1611-fasttrack/x86_64 CentOS-7.3. - Fasttrack disabled
C7.3.1611-updates/x86_64 CentOS-7.3. - Updates disabled
C7.4.1708-base/x86_64 CentOS-7.4. - Base disabled
C7.4.1708-centosplus/x86_64 CentOS-7.4. - CentOSPlus disabled
C7.4.1708-extras/x86_64 CentOS-7.4. - Extras disabled
C7.4.1708-fasttrack/x86_64 CentOS-7.4. - Fasttrack disabled
C7.4.1708-updates/x86_64 CentOS-7.4. - Updates disabled
C7.5.1804-base/x86_64 CentOS-7.5. - Base disabled
C7.5.1804-centosplus/x86_64 CentOS-7.5. - CentOSPlus disabled
C7.5.1804-extras/x86_64 CentOS-7.5. - Extras disabled
C7.5.1804-fasttrack/x86_64 CentOS-7.5. - Fasttrack disabled
C7.5.1804-updates/x86_64 CentOS-7.5. - Updates disabled
C7.6.1810-base/x86_64 CentOS-7.6. - Base disabled
C7.6.1810-centosplus/x86_64 CentOS-7.6. - CentOSPlus disabled
C7.6.1810-extras/x86_64 CentOS-7.6. - Extras disabled
C7.6.1810-fasttrack/x86_64 CentOS-7.6. - Fasttrack disabled
C7.6.1810-updates/x86_64 CentOS-7.6. - Updates disabled
base//x86_64 CentOS- - Base enabled: ,
base-debuginfo/x86_64 CentOS- - Debuginfo enabled: ,
base-source/ CentOS- - Base Sources enabled:
!c7-media CentOS- - Media disabled
centosplus//x86_64 CentOS- - Plus disabled
centosplus-source/ CentOS- - Plus Sources enabled:
cr//x86_64 CentOS- - cr disabled
epel/x86_64 Extra Packages for Enterprise Linux - x86_64 enabled: ,
epel-debuginfo/x86_64 Extra Packages for Enterprise Linux - x86_64 - Debug disabled
!epel-source/x86_64 Extra Packages for Enterprise Linux - x86_64 - Source disabled
epel-testing/x86_64 Extra Packages for Enterprise Linux - Testing - x86_64 disabled
epel-testing-debuginfo/x86_64 Extra Packages for Enterprise Linux - Testing - x86_64 - Debug disabled
epel-testing-source/x86_64 Extra Packages for Enterprise Linux - Testing - x86_64 - Source disabled
extras//x86_64 CentOS- - Extras enabled:
extras-source/ CentOS- - Extras Sources enabled:
fasttrack//x86_64 CentOS- - fasttrack disabled
updates//x86_64 CentOS- - Updates enabled:
updates-source/ CentOS- - Updates Sources enabled:
repolist: ,
4 清空缓存
yum clean all
rm -f /var/cache/yum
5 安装更新
通过对3中repo id的查询，可用使用如下命令，进行全局更新到指定版本
yum --disablerepo='*' --enablerepo='C7.4*' upgrade
6 更新指定软件
yum --disablerepo='*' --enablerepo='C7.4*,epel' update kernel
7 回到正确的release
centos-release是版本标识，我们应该始终保持它指示着正确的信息。
将centos-release包降级回7.4, 之后所有的默认repo便都指向了7.4。
yum --disablerepo="*" --enablerepo="C7.4.1708-*" --enablerepo="epel*" downgrade centos-release
8 常见问题
8.1
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.: . 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. . 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. . 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: systemd-libs--.el7_4..i686 != systemd-libs--.el7.x86_64
Error: Protected multilib versions: elfutils-libs-0.168-.el7.i686 != elfutils-libs-0.170-.el7.x86_64
Error: Protected multilib versions: libselinux-2.5-.el7.i686 != libselinux-2.5-14.1.el7.x86_64
Error: Protected multilib versions: elfutils-libelf-0.168-.el7.i686 != elfutils-libelf-0.170-.el7.x86_64
Error: Protected multilib versions: pam-1.1.-.el7.i686 != pam-1.1.-.el7.x86_64
Error: Protected multilib versions: nss-softokn-freebl-3.28.-.el7_4.i686 != nss-softokn-freebl-3.36.-.el7_5.x86_64
Error: Protected multilib versions: libsepol-2.5-.el7.i686 != libsepol-2.5-.el7.x86_64
没有解决。。。
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