問題一，
創建新用戶xuetong，用該用戶登陸報錯如下：
[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 ~]$
並且顯示I have no name!
解決:由於/etc/passwd 和/etc/group兩個文件的權限（600）不對造成的，
將passwd和group文件的權限改爲644就可以了
chmod 644 /etc/passwd
chmod 644 /etc/group
問題二，
linux下命令行安裝KVM虛擬機
#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
報錯：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
解決：解決: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" (將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"(將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(將dynamic_ownership前#去掉)
問題三，通過xshell遠程連接linux宿主機安裝kvm虛擬機
報錯：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.
解決：通過vnc連接linux宿主機，IP地址+VNC端口號（虛擬機開通的vnc端口號），登錄虛擬機安裝linux操作系統即可。
問題四，安裝apache
報錯：configure: error: Cannot use an external APR with the bundled APR-util
報錯：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.
解決：需要安裝APR及APR-UTIL
安裝APR
# cd srclib/apr
# ./configure --prefix=/usr/local/apr
報錯：onfigure: error: in `/usr/local/httpd-2.2.27/srclib/apr':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details
解決：安裝gcc依賴包 yum -y install gcc
make && make install 時，報錯：
-bash: make: command not found
解決：安裝make軟件包 yum -y install make
安裝apr-util
# cd ../apr-util/
# ./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr
# make
# make install
安裝apache
./configure --prefix=/usr/local/apache --enable-deflate --enable-headers --enable-mime-magic --enable-proxy --enable-ssl=static --enable-so --enable-rewrite --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util --with-mpm=prefork --with-ssl=/usr/local/ssl/include --enable-mods-shared=all
報錯：
checking whether to enable mod_deflate... configure: error: mod_deflate has been requested but can not be built due to prerequisite failures
解決：安裝zlib-devel
yum install zlib-devel
報錯：no SSL-C headers found
configure: error: ...No recognized SSL/TLS toolkit detected
解決：安裝openssl-devel yum install openssl-devel
啓動apache /usr/local/apache/bin/apachectl start
報錯：httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName
解決：更改/usr/local/apache/bin/http.conf中ServerName及/etc/hosts文件中的主機名
安裝apr
# cd srclib/apr
# ./configure --prefix=/usr/local/apr
# make
# make install
安裝apr-util
# cd ../apr-util/
# ./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr
# make
# make install
# cd ../../
加載全局變量：
echo "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/apr/lib " >>/etc/profile
source /etc/profile
安裝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端口是否開啓
問題五
安裝hudson報錯：打開http://192.168.1.81:8081/hudson/ 報錯ERROR
解決：必須保證java版本和hudson版本對應一致。若Java版本低則會報錯。
#ServerName www.example.com:@@Port@@
Listen @@Port@@
問題六
安裝Java報錯：
[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.
解決：
[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
解決方法:
進入目錄：/usr/java/jdk/lib
將tools.pack解壓爲tools.jar：
unpack200 tools.pack tools.jar
進入目錄：/usr/java/jdk/jre/lib
將rt.pack解壓爲rt.jar：
unpack200 rt.pack rt.jar
問題七
yum的時候報錯：
[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錯誤
解決方法如下（修改dns配置）
vi /etc/resolv.conf
在此文件中最後加入nameserver 8.8.8.8
如果沒有vi編輯器可用
echo "nameserver 8.8.8.8" >> /etc/resolv.conf
更改主機名：
vi /etc/sysconfig/network 修改hostname
HOSTNAME=vm85.bc.com
vi /etc/hosts
127.0.0.1 vm85.bc.com
reboot(必須重啓電腦)