PXE(CentOS 6.7):准备环境:
pxe简介:
PXE(preboot execute environment,预启动执行环境)是由Intel公司开发的最新技术,工作于Client/Server的网络模式,支持工作站通过网络从远端服务器下载映像,并由此支持通过网络启动操作系统,在启动过程中,终端要求服务器分配IP地址,再用TFTP(trivial file transfer protocol)或MTFTP(multicast trivial file transfer protocol)协议下载一个启动软件包到本机内存中执行,由这个启动软件包完成终端(客户?)基本软件设置,从而引导预先安装在服务器中的终端操作系统。PXE可以引导多种操作系统,如:Windows95/98/2000/windows2003/windows2008/winXP/win7/win8,linux等。
1.dhcp主机安装服务:
1.安装后默认dhcpd.conf没有配置信息,所以之际复制一份模板:
安装dhcp:yum -y install dhcp
cp /usr/share/doc/dhcp-4.1.1/dhcpd.conf.sample /etc/dhcp/dhcpd.conf
首先修改配置文件:
range ip:地址池配置范围
option routers:路由网关
next-server:告诉dhcp,tftp服务器地址
filename:请求获取的文件
2.准备镜像资源,本机直接挂载光盘资源。
mount -r /dev/cdrom /mnt
在images和isolinux目录里面复制以下文件:
复制:
[root@localhost pxeboot]# cp vmlinuz initrd.img /var/lib/tftpboot/ [root@localhost isolinux]# cp isolinux.cfg vesamenu.c32 splash.jpg boot.msg /var/lib/tftpboot/
创建文件:
[root@localhost isolinux]# mkdir /var/lib/tftpboot/pxelinux.cfg [root@localhost isolinux]# cp isolinux.cfg /var/lib/tftpboot/pxelinux.cfg/default
至此基本配置完成。
2.新建虚拟机
网络模式为dhcp主机地址段:ok完成pxe
3.创建文件树
[root@localhost ~]# mkdir /var/www/html/centos6
将光盘文件卸载,并挂载到
[root@localhost ~]# mount -r /dev/cdrom /var/www/html/centos6/
地址填写为:http://10.0.10.1/centos6 也就是管盘文件挂载的地方
至此已经完成。可以安装了。
2.cobbler
1.Cobbler 概述
Cobbler由python语言开发,是对PXE和Kickstart以及DHCP的封装。融合很多特性,提供了CLI和Web的管理形式。更加方便的实行网络安装。同时,Cobbler也提供了API接口,使用其它语言也很容易做扩展。它不紧可以安装物理机,同时也支持kvm、xen虚拟化、Guest OS的安装。更多的是它还能结合Puppet等集中化管理软件,实现自动化的管理。
下面我们来简单的说明一下,
Server端:
第一步,启动Cobbler服务
第二步,进行Cobbler错误检查,执行cobbler check命令
第三步,进行配置同步,执行cobbler sync命令
第四步,复制相关启动文件文件到TFTP目录中
第五步,启动DHCP服务,提供地址分配
第六步,DHCP服务分配IP地址
第七步,TFTP传输启动文件
第八步,Server端接收安装信息
第九步,Server端发送ISO镜像与Kickstart文件
Client端:
第一步,客户端以PXE模式启动
第二步,客户端获取IP地址
第三步,通过TFTP服务器获取启动文件
第四步,进入Cobbler安装选择界面
第五步,客户端确定加载信息
第六步,根据配置信息准备安装系统
第七步,加载Kickstart文件
第八步,传输系统安装的其它文件
第九步,进行安装系统
支持多安装树的pxe。
PXE:yum repository, (vmlinuz+initrd.img) Distribution
单个系统安装:
特定系统:(pxeboot) vmlinuz, initrd.img
特定系统安装源:yum repository
三个核心组件:
1.repository:
mirror
import
2. distribution
3. profile
1.安装cobbler
需要安装epel源:wget http://mirrors.aliyun.com/epel/6/x86_64/epel-release-6-8.noarch.rpm
yum安装软件:
[root@localhost ~]# yum install cobblercobbler-web pykickstart debmirror httpdsyslinux [root@localhost ~]# yum install dhcptftp-server
启动cobbler,httpd,tftp,dhcp等程序。
tftp,httpd,dhcp,还包括DNS这些服务都可以由cobbler代为管理,也可以独立管理。这里都将这些服务设置为单独管理。
配置cobbler
[root@localhost tftpboot]# vim/etc/cobbler/settings #this is the address of the cobbler server -- as it is used # bysystems during the install process, it must be the address # orhostname of the system as those systems can see the server. # ifyou have a server that appears differently to different subnets #(dual homed, etc), you need to read the --server-override section # ofthe manpage for how that works. server:10.0.10.1
启动cobbler服务,运行cobbler check:
servicecobbler start
运行check后出现如下一堆问题,下面逐个解决:
[root@localhost tftpboot]# cobbler check The following are potential configuration items that you maywant to fix: 1 : For PXE to be functional, the ‘next_server‘ field in/etc/cobbler/settings must be set to something other than 127.0.0.1, and shouldmatch the IP of the boot server on the PXE network. 2 : SELinux is enabled. Please review the following wiki pagefor details on ensuring cobbler works correctly in your SELinux environment: https://github.com/cobbler/cobbler/wiki/Selinux 3 : some network boot-loaders are missing from/var/lib/cobbler/loaders, you may run ‘cobbler get-loaders‘ to download them,or, if you only want to handle x86/x86_64 netbooting, you may ensure that youhave installed a *recent* version of the syslinux package installed and canignore this message entirely. Files in this directory, should you want tosupport all architectures, should include pxelinux.0, menu.c32, elilo.efi, andyaboot. The ‘cobbler get-loaders‘ command is the easiest way to resolve theserequirements. 4 : change ‘disable‘ to ‘no‘ in /etc/xinetd.d/rsync 5 : reposync is not installed, need for cobbler reposync,install/upgrade yum-utils? 6 : comment out ‘dists‘ on /etc/debmirror.conf for properdebian support 7 : comment out ‘arches‘ on /etc/debmirror.conf for properdebian support 8 : The default password used by the sample templates for newlyinstalled machines (default_password_crypted in /etc/cobbler/settings) is stillset to ‘cobbler‘ and should be changed, try: "openssl passwd -1 -salt‘random-phrase-here‘ ‘your-password-here‘" to generate new one 9 : fencing tools were not found, and are required to use the(optional) power management features. install cman or fence-agents to use them Restart cobblerd and then run ‘cobbler sync‘ to apply changes.
1)修改next server
# ifusing cobbler with manage_dhcp, put the IP address # ofthe cobbler server here so that PXE booting guests can find it # ifyou do not set this correctly, this will be manifested in TFTP open timeouts. next_server:10.0.10.1
2)若仅为x86/x86_64架构的服务器提供服务,安装syslinux即可
#yum install syslinux
3)修改rsync的选项为启用:
[root@localhost tftpboot]# chkconfig rsync on
5)安装ksvalidator
# yum install -y pykickstart
6,7)注释掉一下两行/etc/debmirror.conf
#@dists="sid"; #@arches="i386";
8)添加修改一个新的密码:
[root@localhost ~]# vim /etc/cobbler/settings [root@localhost tftpboot]# openssl passwd -1 -salt ‘opensslrand -hex 4‘ Password: $1$openssl $yjM9zoJu5exGoBYrfY.9C. [root@localhost tftpboot]# default_password_crypted: "$1$openssl$yjM9zoJu5exGoBYrfY.9C."
配置完成后
cobbler sync service cobbler restart
检查目录已经生成:
[root@localhost tftpboot]# cd /var/lib/tftpboot/ [root@localhost tftpboot]# ls boot etc grub images memdisk menu.c32 ppc pxelinux.0 pxelinux.cfg s390x [root@localhost tftpboot]#
挂载光盘:
[root@localhost ~]# umount /dev/cdrom [root@localhost ~]# mount /dev/cdrom /media/ -r
cobbler import 加载光盘自动生成distro,时间比较长
[root@localhost ~]# cobbler import --path=/media/--name=centos6.7-x86_64
查看已经生成:
[root@localhost ~]# cd /var/www/cobbler [root@localhost cobbler]# ls aux images ks_mirror links localmirror pub rendered repo_mirror svc
制作ks.cfg文件
首先安装system-config-kickstart。
yum install system-config-kickstart
执行system-config-kickstart启用图形界面进行配置
system-config-kickstart
将制作好的文件保存在本机上
将文件导入到以下地方并且添加profile:
[root@localhost ~]# cp ks.cfg /var/lib/cobbler/kickstarts/ cp: overwrite `/var/lib/cobbler/kickstarts/ks.cfg‘? y [root@localhost ~]# cobbler distro list centos6.7-x86_64
即为某个distro提供kickstart文件来生成一个特定的系统安装配置。
[root@localhost ~]# cobbler profile add--name="centos6.-x86_64-web" --distro=centos6.7-x86_64--kickstart=/var/lib/cobbler/kickstarts/ks.cfg [root@localhost ~]#
查看一下:
[root@localhost ~]# cobbler profile list centos6.6-x86_64-web centos6.7-x86_64 [root@localhost ~]# [root@localhost ~]# cobbler sync ####注意每一次修改配置都要执行一下sync
测试完成,已经可以自动化安装了。
3.cobbler web界面
cobbler_web支持多种认证方式,如authn_configfile、authn_ldap或authn_pam等,这里使用authn_pam模块实现认证。
[root@node1 ~]# vim/etc/cobbler/modules.conf [authentication] module = authn_pam
添加系统用户:
[root@node1 ~]# useradd baby [root@node1 ~]# echo"baby" | passwd --stdin baby Changing password for user baby. passwd: all authentication tokensupdated successfully.
添加该系统用户至/etc/cobbler/users.conf文件
[root@node1 ~]# vim/etc/cobbler/users.conf [admins] admin = "baby"
配置完成重启cobbler服务:
[root@node1 ~]# service cobblerdrestart Stopping cobblerdaemon: [ OK ] Starting cobblerdaemon: [ OK ]
如果用默认验证方式:
需要[root@localhost cobbler]# htdigest/etc/cobbler/users.digest "Cobbler" cobbler
Adding user cobbler in realm cobbler New password: Re-type new password:
[root@localhost kickstarts]# 创建digest文件:
查看已经文件已经生成:users.digest
[root@localhost cobbler]# cobbler sync [root@localhost cobbler]# service httpd restart [root@localhost cobbler]# service cobblerd restart
测试已经可以登录了:
创建一个:
执行cobbler sync:发现已经成功:
注意:
(1)dhcp服务定义filename
filename"pxelinux.0"
(2)/etc/cobbler/settings
manage_dhcp:0
manage_tftpd:0
(3)使用cobbler import可直接导致光盘中安装树,会自动生成相应的distro及profile
生成的profile会使用默认的ks文件/var/lib/cobbler/kickstarts/default.ks文件
(4)可自定义kicsktart文件,而后新建profile
(5)cobbler_web 2.6中使用htdigest的认证方式,添加用户
htdigest/etc/cobbler/users.digest "Cobbler" cobbler
本文出自 “我的学习博客” 博客,请务必保留此出处http://houzhimeng.blog.51cto.com/3938990/1733598
原文:http://houzhimeng.blog.51cto.com/3938990/1733598