问题一，
创建新用户xuetong，用该用户登陆报错如下：
[root@R715 ~]# su - xuetong
id: cannot find name for user ID 504
id: cannot find name for group ID 504
id: cannot find name for user ID 504
[I have no name!@R715 ~]$
并且显示I have no name!
解决:由于/etc/passwd 和/etc/group两个文件的权限（600）不对造成的，
将passwd和group文件的权限改为644就可以了
chmod 644 /etc/passwd
chmod 644 /etc/group
问题二，
linux下命令行安装KVM虚拟机
#virt-install --name mem1 --hvm --ram 2048 --vcpus 2 --disk path=/opt/vms/os_11.img,size=10 --network network:default --accelerate --vnc --vncport=5911 --vnclisten=0.0.0.0 --os-variant rhel6 --cdrom /root/CentOS-6.3-x86_64-minimal-EFI.iso -d
报错：qemu-kvm: -drive file=/root/CentOS-6.3-x86_64-minimal-EFI.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw: could not open disk image /root/CentOS-6.3-x86_64-minimal-EFI.iso: Permission denied
解决：解决:vim /etc/libvirt/qemu.conf
# Some examples of valid values are:
#
# user = "qemu" # A user named "qemu"
# user = "+0" # Super user (uid=0)
# user = "100" # A user named "100" or a user with uid=100
user = "root" (将user前#去掉)
# The group for QEMU processes run by the system instance. It can be
# specified in a similar way to user.
group = "root"(将group前#去掉)
# Whether libvirt should dynamically change file ownership
# to match the configured user/group above. Defaults to 1.
# Set to 0 to disable file ownership changes.
dynamic_ownership = 0(将dynamic_ownership前#去掉)
问题三，通过xshell远程连接linux宿主机安装kvm虚拟机
报错：Cannot open display:
Run 'virt-viewer --help' to see a full list of available command line options
Fri, 05 Sep 2014 18:24:50 DEBUG Domain state after install: 1
Domain installation still in progress. You can reconnect to
the console to complete the installation process.
解决：通过vnc连接linux宿主机，IP地址+VNC端口号（虚拟机开通的vnc端口号），登录虚拟机安装linux操作系统即可。
问题四，安装apache
报错：configure: error: Cannot use an external APR with the bundled APR-util
报错：checking for APR... configure: error: the --with-apr parameter is incorrect. It must specify an install prefix, a build directory, or an apr-config file.
解决：需要安装APR及APR-UTIL
安装APR
# cd srclib/apr
# ./configure --prefix=/usr/local/apr
报错：onfigure: error: in `/usr/local/httpd-2.2.27/srclib/apr':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details
解决：安装gcc依赖包 yum -y install gcc
make && make install 时，报错：
-bash: make: command not found
解决：安装make软件包 yum -y install make
安装apr-util
# cd ../apr-util/
# ./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr
# make
# make install
安装apache
./configure --prefix=/usr/local/apache --enable-deflate --enable-headers --enable-mime-magic --enable-proxy --enable-ssl=static --enable-so --enable-rewrite --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util --with-mpm=prefork --with-ssl=/usr/local/ssl/include --enable-mods-shared=all
报错：
checking whether to enable mod_deflate... configure: error: mod_deflate has been requested but can not be built due to prerequisite failures
解决：安装zlib-devel
yum install zlib-devel
报错：no SSL-C headers found
configure: error: ...No recognized SSL/TLS toolkit detected
解决：安装openssl-devel yum install openssl-devel
启动apache /usr/local/apache/bin/apachectl start
报错：httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName
解决：更改/usr/local/apache/bin/http.conf中ServerName及/etc/hosts文件中的主机名
安装apr
# cd srclib/apr
# ./configure --prefix=/usr/local/apr
# make
# make install
安装apr-util
# cd ../apr-util/
# ./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr
# make
# make install
# cd ../../
加载全局变量：
echo "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/apr/lib " >>/etc/profile
source /etc/profile
安装APACHE
#cd httpd-2.2.21
yum install zlib-devel
./configure --prefix=/usr/local/apache --enable-deflate --enable-headers --enable-mime-magic --enable-proxy --enable-ssl=static --enable-so --enable-rewrite --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util --with-mpm=prefork --with-ssl=/usr/local/ssl/include --enable-mods-shared=all
#make && make install
#netstat -an | grep :80 //查看linux80端口是否开启
问题五
安装hudson报错：打开http://192.168.1.81:8081/hudson/ 报错ERROR
解决：必须保证java版本和hudson版本对应一致。若Java版本低则会报错。
#ServerName www.example.com:@@Port@@
Listen @@Port@@
问题六
安装Java报错：
[root@vm80 java]# java -version
java version "1.5.0"
gij (GNU libgcj) version 4.4.7 20120313 (Red Hat 4.4.7-4)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
解决：
[root@vm80 bin]# rm -f java
[root@vm80 usr]# ln -s /usr/java/jdk1.6.0_26/bin/java /usr/bin/java
[root@vm80 usr]# java -version
Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object
解决方法:
进入目录：/usr/java/jdk/lib
将tools.pack解压为tools.jar：
unpack200 tools.pack tools.jar
进入目录：/usr/java/jdk/jre/lib
将rt.pack解压为rt.jar：
unpack200 rt.pack rt.jar
问题七
yum的时候报错：
[root@vm87 local]# yum -y install wget
Loaded plugins: fastestmirror, presto
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
Error: Cannot find a valid baseurl for repo: base错误
解决方法如下（修改dns配置）
vi /etc/resolv.conf
在此文件中最后加入nameserver 8.8.8.8
如果没有vi编辑器可用
echo "nameserver 8.8.8.8" >> /etc/resolv.conf
更改主机名：
vi /etc/sysconfig/network 修改hostname
HOSTNAME=vm85.bc.com
vi /etc/hosts
127.0.0.1 vm85.bc.com
reboot(必须重启电脑)