我知道官方 CentOS 6（甚至 7）更新存储库不提供安全信息。结果是yum-plugin-security插件和yum check-update --security命令不会列出任何更新，例如 onRHEL或OELdistros。
有一个不错的剧本生成更新信息它能够将丢失的安全信息注入本地yum存储库。该插件甚至可以在 CentOS 上运行。
不幸的是，我有一个小问题。我不确定问题是出在脚本上还是yum工作方式上。
如何重现该问题（在 CentOS 6.8、x86_64 上测试，但 IMO，以前/较新的版本也遇到同样的问题）：
- 首先，让我们清理一切，从清理桌子开始
yum clean all
- 让我们看看有哪些安全更新可用（系统不是最新的）
yum check-update --security ... 56 package(s) needed for security, out of 28 available kernel.x86_64 2.6.32-642.15.1.el6 local-centos-6-x86_64-updates kernel-devel.x86_64 2.6.32-642.15.1.el6 local-centos-6-x86_64-updates kernel-firmware.noarch 2.6.32-642.15.1.el6 local-centos-6-x86_64-updates kernel-headers.x86_64 2.6.32-642.15.1.el6 local-centos-6-x86_64-updates libtiff.x86_64 3.9.4-21.el6_8 local-centos-6-x86_64-updates openssl.x86_64 1.0.1e-48.el6_8.4 local-centos-6-x86_64-updates sudo.x86_64 1.8.6p3-25.el6_8 local-centos-6-x86_64-updates
- 现在，让我们安装eg
squid包
yum install -y squid ... Resolving Dependencies --> Running transaction check ---> Package squid.x86_64 7:3.1.23-16.el6_8.6 will be installed --> Finished Dependency Resolution Dependencies Resolved ==================================================================================================================== Package Arch Version Repository Size ==================================================================================================================== Installing: squid x86_64 7:3.1.23-16.el6_8.6 lp-centos-6-x86_64-updates 1.8 M Transaction Summary ==================================================================================================================== Install 1 Package(s) Total download size: 1.8 M Installed size: 6.3 M Downloading Packages: squid-3.1.23-16.el6_8.6.x86_64.rpm | 1.8 MB 00:00 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Warning: RPMDB altered outside of yum. Installing : 7:squid-3.1.23-16.el6_8.6.x86_64 1/1 Verifying : 7:squid-3.1.23-16.el6_8.6.x86_64 1/1 Installed: squid.x86_64 7:3.1.23-16.el6_8.6 Complete!
- 我想测试软件包的更新，所以我们先尝试降级它
yum downgrade -y squid ... Resolving Dependencies --> Running transaction check ---> Package squid.x86_64 7:3.1.23-16.el6_8.5 will be a downgrade ---> Package squid.x86_64 7:3.1.23-16.el6_8.6 will be erased --> Finished Dependency Resolution Dependencies Resolved ==================================================================================================================== Package Arch Version Repository Size ==================================================================================================================== Downgrading: squid x86_64 7:3.1.23-16.el6_8.5 lp-centos-6-x86_64-updates 1.8 M Transaction Summary ==================================================================================================================== Downgrade 1 Package(s) Total download size: 1.8 M Downloading Packages: squid-3.1.23-16.el6_8.5.x86_64.rpm | 1.8 MB 00:00 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : 7:squid-3.1.23-16.el6_8.5.x86_64 1/2 Cleanup : 7:squid-3.1.23-16.el6_8.6.x86_64 2/2 Verifying : 7:squid-3.1.23-16.el6_8.5.x86_64 1/2 Verifying : 7:squid-3.1.23-16.el6_8.6.x86_64 2/2 Removed: squid.x86_64 7:3.1.23-16.el6_8.6 Installed: squid.x86_64 7:3.1.23-16.el6_8.5 Complete!
- 让我们仔细检查一下它安装了什么
rpm -qa | grep -i squid squid-3.1.23-16.el6_8.5.x86_64
- 此时，我希望当我再次检查安全更新时，该
squid软件包应该是新列出的，但事实并非如此
yum check-update --security ... 56 package(s) needed for security, out of 28 available kernel.x86_64 2.6.32-642.15.1.el6 local-centos-6-x86_64-updates kernel-devel.x86_64 2.6.32-642.15.1.el6 local-centos-6-x86_64-updates kernel-firmware.noarch 2.6.32-642.15.1.el6 local-centos-6-x86_64-updates kernel-headers.x86_64 2.6.32-642.15.1.el6 local-centos-6-x86_64-updates libtiff.x86_64 3.9.4-21.el6_8 local-centos-6-x86_64-updates openssl.x86_64 1.0.1e-48.el6_8.4 local-centos-6-x86_64-updates sudo.x86_64 1.8.6p3-25.el6_8 local-centos-6-x86_64-updates
- 让我们看看系统上安装了哪些鱿鱼勘误表。这有点奇怪。从上面可以看出，squid 已降级为
squid-3.1.23-16.el6_8.5.x86_64(CEBA_2016__1412 bugfix)，但squid-3.1.23-16.el6_8.6.x86_64(CESA_2016__1573) 似乎仍标记为已安装
yum updateinfo list all | grep squid-3 i CESA_2011__1791 Moderate/Sec. squid-3.1.10-1.el6_2.1.x86_64 i CEBA_2012__0122 bugfix squid-3.1.10-1.el6_2.2.x86_64 i CEBA_2012__0470 bugfix squid-3.1.10-1.el6_2.3.x86_64 i CEBA_2012__0557 bugfix squid-3.1.10-1.el6_2.4.x86_64 i CEBA_2012__1290 bugfix squid-3.1.10-9.el6_3.x86_64 i CESA_2013__0505 Moderate/Sec. squid-3.1.10-16.el6.x86_64 i CEBA_2013__0985 bugfix squid-3.1.10-18.el6_4.x86_64 i CEBA_2013__1396 bugfix squid-3.1.10-19.el6_4.x86_64 i CEBA_2014__0048 bugfix squid-3.1.10-20.el6_5.x86_64 i CESA_2014__0597 Moderate/Sec. squid-3.1.10-20.el6_5.3.x86_64 i CESA_2014__1148 Important/Sec. squid-3.1.10-22.el6_5.x86_64 i CEBA_2014__1446 bugfix squid-3.1.10-29.el6.x86_64 i CEBA_2015__1314 bugfix squid-3.1.23-9.el6.x86_64 i CEBA_2016__0896 bugfix squid-3.1.23-16.el6.x86_64 i CESA_2016__1138 Moderate/Sec. squid-3.1.23-16.el6_8.4.x86_64 i CEBA_2016__1412 bugfix squid-3.1.23-16.el6_8.5.x86_64 i CESA_2016__1573 Moderate/Sec. squid-3.1.23-16.el6_8.6.x86_64
- 当我尝试获取该勘误表的信息时，什么也没有
yum update info CESA_2016__1573 --- NOTHING NOTHING NOTHING ---
- 当我尝试列出除 grep 之外的所有勘误表时，我可以看到它
yum updateinfo info all | grep CESA_2016__1573 -B3 -A8 =============================================================================== Moderate CentOS squid Security Update =============================================================================== Update ID : CESA_2016__1573 Release : CentOS 6 Type : security Status : stable Issued : 2016-08-04 12:51:39 Description : Moderate CentOS squid Security Update Severity : Moderate Installed : true
我想指出的是，我在 RHEL6 上测试了这个场景（降级/升级）并且它有效。我还尝试直接安装旧版本的squid软件包以避免降级/升级顺序，但结果也是相同的。而且这个问题squid不仅仅与包有关。基本上，我可以使用任何包重现该问题。我还尝试yum在软件包降级后清理缓存，但没有帮助。
知道可能出了什么问题吗？！？为什么它被标记为已安装，而实际上并未安装？！？在 RHEL6 上测试时，我可以看到它没有安装，然后它包含在要更新的软件包列表中。
感谢您的任何答复。