二：GD2编译的时候出现的错误： The usual way to define `LIBTOOL’ is to add `AC_PROG_LIBTOOL’ Libtool library used but `LIBTOOL’ is undefined [Makefile.in] Error 1 解决：缺少编译安装的软件包。如：yum install automake,libjpeg-devel,libpng-devel,freetype-devel,libtiff-devel,autoconf,gettext-devel,libtool
三：安装 snmp的时候出现的错误： 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 解决：以为缺少libbeecrypt.la ，libbeecrypt.so等共享库，如：yum install libbeecrypt.la 2>/usr/bin/ld: cannot find -lelf 解决：ln -s /usr/lib/libelf.so.1 /usr/lib/libelf.so 3>/usr/bin/ld:can’t not find -lselinux 解决：缺少libselinux 和 libselinux-devel包，如：yum install libselinux
四：Rsync同步常见问题： 错误一： @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) 解决：这是因为密码设置错了，无法登入成功，检查一下rsync.pwd，看客服是否匹配。还有服务器端没启动rsync 服务也会出现这种情况。 错误二： password file must not be other-accessible continuing without password file Password: 解决：这是因为rsyncd.pwd rsyncd.sec的权限不对，应该设置为600。如：chmod 600 rsyncd.pwd 错误三： @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) 解决：这是因为你在 rsync.conf 中设置的 path 路径不存在，要新建目录才能开启同步。 错误四： 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] 解决：对方没开机、防火墙阻挡、通过的网络上有防火墙阻挡，都有可能。关闭防火墙，其实就是把tcp udp 的873端口打开。
