YUM降级基本用法 当包没有任何依赖关系时，降级是非常简单的。
YUM降级（没有依赖）
yum downgrade package
例：
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yum downgrade hunspell-mr.noarch
Setting up Downgrade Process
Resolving Dependencies
--> Running transaction check
---> Package hunspell-mr.noarch 0:20060920-5.fc13 set to be downgraded
---> Package hunspell-mr.noarch 0:20060920-6.fc14 set to be erased
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Downgrading:
hunspell-mr noarch 20060920-5.fc13 fedora 62 k
Transaction Summary
================================================================================
Downgrade 1 Package(s)
Total download size: 62 k
Is this ok [y/N]: y
Downloading Packages:
hunspell-mr-20060920-5.fc13.noarch.rpm | 62 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : hunspell-mr-20060920-5.fc13.noarch 1/2
Cleanup : hunspell-mr-20060920-6.fc14.noarch 2/2
Removed:
hunspell-mr.noarch 0:20060920-6.fc14
Installed:
hunspell-mr.noarch 0:20060920-5.fc13
Complete!
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YUM降级（有依赖）
对于具有依赖关系的包，YUM降级更加困难。YUM降级不会自动解决依赖关系，因此必须手动完成。
YUM降级包和依赖关系
yum downgrade lib1 lib2 package #要有软件包和依赖
示例：手动检查包依赖项
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yum downgrade sqlite
Setting up Downgrade Process
Resolving Dependencies
--> Running transaction check
---> Package sqlite.i686 0:3.6.22-1.fc13 set to be downgraded
---> Package sqlite.i686 0:3.6.23-1.fc14 set to be erased
--> Finished Dependency Resolution
Error: Package: sqlite-devel-3.6.23-1.fc14.i686 (@rawhide/12)
Requires: sqlite = 3.6.23-1.fc14
Removing: sqlite-3.6.23-1.fc14.i686 (@rawhide/12)
sqlite = 3.6.23-1.fc14
Downgraded By: sqlite-3.6.22-1.fc13.i686 (fedora)
sqlite = 3.6.22-1.fc13
You could try using --skip-broken to work around the problem
SQLite包依赖于sqlite-devel包，因此必须降级（sqlite-devel和sqlite）：
再来一次加上依赖
yum downgrade sqlite sqlite-devel #要加上依赖
Setting up Downgrade Process
Resolving Dependencies
--> Running transaction check
---> Package sqlite.i686 0:3.6.22-1.fc13 set to be downgraded
---> Package sqlite.i686 0:3.6.23-1.fc14 set to be erased
---> Package sqlite-devel.i686 0:3.6.22-1.fc13 set to be downgraded
---> Package sqlite-devel.i686 0:3.6.23-1.fc14 set to be erased
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Downgrading:
sqlite i686 3.6.22-1.fc13 fedora 309 k
sqlite-devel i686 3.6.22-1.fc13 fedora 80 k
Transaction Summary
================================================================================
Downgrade 2 Package(s)
Total download size: 389 k
Is this ok [y/N]: y
Downloading Packages:
(1/2): sqlite-3.6.22-1.fc13.i686.rpm | 309 kB 00:00
(2/2): sqlite-devel-3.6.22-1.fc13.i686.rpm | 80 kB 00:00
--------------------------------------------------------------------------------
Total 438 kB/s | 389 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : sqlite-3.6.22-1.fc13.i686 1/4
Installing : sqlite-devel-3.6.22-1.fc13.i686 2/4
Cleanup : sqlite-devel-3.6.23-1.fc14.i686 3/4
Cleanup : sqlite-3.6.23-1.fc14.i686 4/4
Removed:
sqlite.i686 0:3.6.23-1.fc14 sqlite-devel.i686 0:3.6.23-1.fc14
Installed:
sqlite.i686 0:3.6.22-1.fc13 sqlite-devel.i686 0:3.6.22-1.fc13
Complete!