給redhat5.9安裝一個FTP的客戶端，總是提示 error while loading shared libraries: libgio-2.0.so.0: cannot open shared object file: No such file or directory，就想着換個YUM源試試，結果操作失誤把YUM給卸載掉了，當時我的那個心啊，想拿豆腐給撞死。
首先檢查Python有沒有被卸載掉，直接運行python，看有沒提示版本什麼的，如果Python也被卸載了，那就麻煩多了，就要用rpm安裝，然後一個一個的下載安裝依賴包，或者源碼編譯安裝python了，這裏我就不說怎麼安了。
開始安裝yum遇到了要安各種依賴包，讓人崩潰啊， 安裝了rpmdb想解決依賴，結果點反應都沒有，這個方法就這樣結束了。利用了科學上網才找到了rpmdb的包，百度還找不到。rpm不行，我就源碼安裝yum唄，安裝報錯就如圖
有的資料就說如果不安裝python-urlgrabber，python-pycurl，yum-metadata-parser這3個包的話，在下面運行./yummain.py install yum的話會報以下錯誤，我把這三個包下了安裝也是缺少各種依賴，也沒辦法進行啊！！
報錯：
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Traceback (most recent call last):
File "/usr/bin/yum", line 29, in ?
yummain.user_main(sys.argv[1:], exit_code=True)
File "/usr/share/yum-cli/yummain.py", line 309, in user_main
errcode = main(args)
File "/usr/share/yum-cli/yummain.py", line 178, in main
result, resultmsgs = base.doCommands()
File "/usr/share/yum-cli/cli.py", line 345, in doCommands
self._getTs(needTsRemove)
File "/usr/lib/python2.4/site-packages/yum/depsolve.py", line 101, in _getTs
self._getTsInfo(remove_only)
File "/usr/lib/python2.4/site-packages/yum/depsolve.py", line 112, in _getTsInfo
pkgSack = self.pkgSack
File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 661, in <lambda>
pkgSack = property(fget=lambda self: self._getSacks(),
File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 501, in _getSacks
self.repos.populateSack(which=repos)
File "/usr/lib/python2.4/site-packages/yum/repos.py", line 232, in populateSack
self.doSetup()
File "/usr/lib/python2.4/site-packages/yum/repos.py", line 79, in doSetup
self.ayum.plugins.run('postreposetup')
File "/usr/lib/python2.4/site-packages/yum/plugins.py", line 179, in run
func(conduitcls(self, self.base, conf, **kwargs))
File "/usr/lib/yum-plugins/fastestmirror.py", line 181, in postreposetup_hook
all_urls = FastestMirror(all_urls).get_mirrorlist()
File "/usr/lib/yum-plugins/fastestmirror.py", line 333, in get_mirrorlist
self._poll_mirrors()
File "/usr/lib/yum-plugins/fastestmirror.py", line 376, in _poll_mirrors
pollThread.start()
File "/usr/lib/python2.4/threading.py", line 416, in start
_start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread
就這樣找了一天的資料，我在網易源上去下載這些包，因爲這次系統是redhat,所以考慮在之前先要對比redhat跟centos的內核，參考資料http://www.centoscn.com/CentOS/Intermediate/2014/1230/4399.html，然後我在這裏http://mirrors.163.com/centos/5/os/x86_64/CentOS/要下載幾個包；
yum-3.2.22-20.el5.centos.noarch.rpm ,yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm
python-iniparse-0.2.3-4.el5.noarch.rpm yum-fastestmirror-1.1.16-13.el5.centos.noarch.rpm
rpm安裝這4個包，除了Python提示已經安裝外，yum的這三個包居然都安裝成功了，yum就又能用了。
YUM 是恢復了但是 libgio-2.0.so.0還沒解決，後面接着弄吧，這個文檔就記錄到這裏吧！