一：卸載的時候出現的錯誤：
umount /dev/nb1
device is busy
解決：找到是什么進程使得他busy，用 lsof /dev/nb1 . kill掉那個進程,然后重新umount即可。

二：GD2編譯的時候出現的錯誤：
The usual way to define `LIBTOOL’ is to add `AC_PROG_LIBTOOL’
Libtool library used but `LIBTOOL’ is undefined
[Makefile.in] Error 1
解決：缺少編譯安裝的軟件包。如：yum install automake,libjpeg-devel,libpng-devel,freetype-devel,libtiff-devel,autoconf,gettext-devel,libtool

三：安裝 snmp的時候出現的錯誤：
1>/bin/sed: can’t read /usr/lib/libbeecrypt.la: No such file or directory
libtool: link: `/usr/lib/libbeecrypt.la’ is not a valid libtool archive
make[1]: *** [libnetsnmpmibs.la] Error 1
解決：以為缺少libbeecrypt.la ，libbeecrypt.so等共享庫，如：yum install libbeecrypt.la
2>/usr/bin/ld: cannot find -lelf
解決：ln -s /usr/lib/libelf.so.1 /usr/lib/libelf.so
3>/usr/bin/ld:can’t not find -lselinux
解決：缺少libselinux 和 libselinux-devel包，如：yum install libselinux

四：Rsync同步常見問題：
錯誤一：
@ERROR: auth failed on module xxxxx
rsync: connection unexpectedly closed (90 bytes read so far)
rsync error: error in rsync protocol data stream (code 12) at io.c(150)
解決：這是因為密碼設置錯了，無法登入成功，檢查一下rsync.pwd，看客服是否匹配。還有服務器端沒啟動rsync 服務也會出現這種情況。
錯誤二：
password file must not be other-accessible
continuing without password file
Password:
解決：這是因為rsyncd.pwd rsyncd.sec的權限不對，應該設置為600。如：chmod 600 rsyncd.pwd
錯誤三：
@ERROR: chroot failed
rsync: connection unexpectedly closed (75 bytes read so far)
rsync error: error in rsync protocol data stream (code 12) at io.c(150)
解決：這是因為你在 rsync.conf 中設置的 path 路徑不存在，要新建目錄才能開啟同步。
錯誤四：
rsync: failed to connect to 218.107.243.2: No route to host (113)
rsync error: error in socket IO (code 10) at clientserver.c(104) [receiver=2.6.9]
解決：對方沒開機、防火墻阻擋、通過的網絡上有防火墻阻擋，都有可能。關閉防火墻，其實就是把tcp udp 的873端口打開。

五：軟件安裝的時候常出現的問題：
configure: error: …No recognized SSL/TLS toolkit detected
# yum -y install openssl-devel

configure: error: no acceptable cc found in $PATH
yum -y install gcc-c++

configure: error: cannot find output from lex; giving up flex is not installed, install flex.
yum -y install flex

configure: error: xml2-config not found. Please check your libxml2 installation.
yum -y install libxml2-devel

configure: error: Cannot find OpenSSL’s
yum -y install openssl-devel

configure: error: Please reinstall the BZip2 distribution
yum -y install bzip2-devel

configure: error: Please reinstall the libcurl distribution - easy.h should be in /include/curl/
yum -y install curl-devel

configure: error: libjpeg.(a|so) not found.
yum -y install libjpeg-devel

configure: error: libpng.(a|so) not found.
yum -y install libpng-devel

configure: error: freetype2 not found!
yum -y install freetype-devel

configure: error: Unable to locate gmp.h
yum -y install gmp-devel

configure: error: Cannot find pspell
yum -y install aspell-devel

libtool: link: cannot find the library `/usr/lib/libbeecrypt.la’ (librpmio.la: /usr/lib/libbeecrypt.la)
解決：缺少beecrypt包，如：
http://sourceforge.net/projects/beecrypt下載beecrypt-4.1.2.tar.gz
然后運行如下命令：
#tar -zxvf beecrypt-4.1.2.tar.gz
#./configure
#make
#make install

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