1、配置chrony服务，实现服务器时间自动同步
~]# yum install chrony -y
# 修改时钟服务器
~]# vi /etc/chrony.conf
...
server 0.centos.pool.ntp.org iburst
server 1.centos.pool.ntp.org iburst
server 2.centos.pool.ntp.org iburst
server 3.centos.pool.ntp.org iburst
...
# 启动 chronyd
~]# systemctl start chronyd.service
~]# systemctl enable chronyd.service
# 查看时间同步源
~]# chronyc sources -v
210 Number of sources = 4
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 203.107.6.88 2 6 177 61 +27us[ +181us] +/- 14ms
^- h199-182-204-197.ip4.unm> 2 6 177 60 +47ms[ +47ms] +/- 146ms
^? ntp8.flashdance.cx 2 6 3 59 +274us[ +274us] +/- 213ms
^- a.chl.la 2 6 207 51 -20ms[ -20ms] +/- 130ms
# 查看时间同步源状态
~]# chronyc sourcestats -v
210 Number of sources = 4
.- Number of sample points in measurement set.
/ .- Number of residual runs with same sign.
| / .- Length of measurement set (time).
| | / .- Est. clock freq error (ppm).
| | | / .- Est. error in freq.
| | | | / .- Est. offset.
| | | | | | On the -.
| | | | | | samples. \
| | | | | | |
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
203.107.6.88 11 6 460 +0.222 10.719 +14us 1079us
h199-182-204-197.ip4.unm> 11 6 464 +14.785 56.248 +45ms 6491us
ntp8.flashdance.cx 6 3 325 +30.213 217.331 +8413us 7201us
a.chl.la 8 5 465 -20.530 233.250 -37ms 14ms
2、实现cobbler+pxe自动化装机
准备环境
准备一台 CentOS 7 虚拟机，分配两块虚拟网卡，一个桥接模式(ens33：可以联网安装软件)，一个仅主机模式（ens37：配置一个固定IP，关掉vmvare仅主机模式网络的DHCP服务）
~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.58.149 netmask 255.255.255.0 broadcast 192.168.58.255
inet6 fe80::e179:f714:a156:7d37 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:da:e9:ef txqueuelen 1000 (Ethernet)
RX packets 180 bytes 19350 (18.8 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 51 bytes 8075 (7.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens37: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.146.10 netmask 255.255.255.0 broadcast 192.168.146.255
inet6 fe80::20c:29ff:feda:e9f9 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:da:e9:f9 txqueuelen 1000 (Ethernet)
RX packets 141 bytes 13512 (13.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 10 bytes 776 (776.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 4 bytes 348 (348.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4 bytes 348 (348.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
image-20200229121041618.png
PXE
安装配置DHCP
~]# yum install dhcp -y
# 查看 dhcpd.conf 的帮助文档
~]# man dhcpd.conf
# 查看 dhcp 安装的文件列表
~]# rpm -ql dhcp
~]# cat /etc/dhcp/dhcpd.conf
#
# DHCP Server Configuration file.
# see /usr/share/doc/dhcp*/dhcpd.conf.example
# see dhcpd.conf(5) man page
#
option domain-name "localhost";
option domain-name-servers 192.168.146.10, 8.8.8.8;
default-lease-time 600;
max-lease-time 7200;
log-facility local7;
subnet 192.168.146.0 netmask 255.255.255.0 {
range 192.168.146.100 192.168.146.200;
option routers 192.168.146.10;
}
next-server 192.168.146.10;
filename "pxelinux.0";
~]# systemctl enable dhcpd.service
~]# systemctl start dhcpd.service
安装配置PXE
# 挂载光盘镜像
~]# ll /dev/cdrom
lrwxrwxrwx. 1 root root 3 Feb 29 21:10 /dev/cdrom -> sr0
~]# mkdir /media/cdrom
~]# mount -r -t iso9660 /dev/cdrom /media/cdrom
~]# ll /media/cdrom/
total 108
-rw-rw-r--. 1 root root 14 Nov 26 2018 CentOS_BuildTag
drwxr-xr-x. 3 root root 2048 Nov 26 2018 EFI
-rw-rw-r--. 1 root root 227 Aug 30 2017 EULA
-rw-rw-r--. 1 root root 18009 Dec 10 2015 GPL
drwxr-xr-x. 3 root root 2048 Nov 26 2018 images
drwxr-xr-x. 2 root root 2048 Nov 26 2018 isolinux
drwxr-xr-x. 2 root root 2048 Nov 26 2018 LiveOS
drwxrwxr-x. 2 root root 71680 Nov 26 2018 Packages
drwxr-xr-x. 2 root root 4096 Nov 26 2018 repodata
-rw-rw-r--. 1 root root 1690 Dec 10 2015 RPM-GPG-KEY-CentOS-7
-rw-rw-r--. 1 root root 1690 Dec 10 2015 RPM-GPG-KEY-CentOS-Testing-7
-r--r--r--. 1 root root 2883 Nov 26 2018 TRANS.TBL
# 配置 YUM 源服务
~]# yum install httpd -y
~]# ln -s /media/cdrom /var/www/html/centos7
~]# systemctl start httpd.service
# 生产 kickstart 配置文件
~]# yum install system-config-kickstart -y
# 使用 system-config-kickstart 工具生成 kickstart 配置文件
~]# system-config-kickstart centos7.cfg
~]# cp centos7.cfg /var/www/html/
# 安装PXE
~]# yum -y install syslinux tftp-server xinetd
# 复制PXE引导文件
~]# cp /usr/share/syslinux/pxelinux.0 /var/lib/tftpboot/
~]# cp /usr/share/syslinux/{chain.c32,mboot.c32,menu.c32,memdisk} /var/lib/tftpboot/
~]# cp /media/cdrom/images/pxeboot/{initrd.img,vmlinuz} /var/lib/tftpboot/
~]# mkdir /var/lib/tftpboot/pxelinux.cfg/
~]# vi /var/lib/tftpboot/pxelinux.cfg/default
default menu.c32
prompt 5
timeout 30
MENU TITLE CentOS 7 PXE Menu
LABEL linux
MENU LABEL Install CentOS 7 x86_64
KERNEL vmlinuz
APPEND initrd=initrd.img inst.repo=http://192.168.146.10/centos7 ks=http://192.168.146.10/centos7.cfg
~]# systemctl start tftp.socket
~]# systemctl start tftp.service
~]# systemctl start xinetd.service
测试
注意客户机最小内存2G
pxe-01.png
pxe-02.png
Cobbler
安装配置Cobbler
~]# yum install epel-release -y
~]# yum install cobbler cobbler-web pykickstart httpd dhcp rsync xinetd -y
~]# systemctl enable httpd.service
~]# systemctl start httpd.service
# 配置 HDCP
~]# cat /etc/dhcp/dhcpd.conf
#
# DHCP Server Configuration file.
# see /usr/share/doc/dhcp*/dhcpd.conf.example
# see dhcpd.conf(5) man page
#
option domain-name "localhost";
option domain-name-servers 192.168.146.10, 8.8.8.8;
default-lease-time 600;
max-lease-time 7200;
log-facility local7;
subnet 192.168.146.0 netmask 255.255.255.0 {
range 192.168.146.100 192.168.146.200;
option routers 192.168.146.10;
}
next-server 192.168.146.10;
filename "pxelinux.0";
~]# systemctl start dhcpd.service
~]# systemctl enable dhcpd.service
# 配置 Cobbler
~]# systemctl enable cobblerd.service
~]# systemctl start cobblerd.service
~]# cobbler check
The following are potential configuration items that you may want to fix:
1 : The 'server' field in /etc/cobbler/settings must be set to something other than localhost, or kickstarting features will not work. This should be a resolvable hostname or IP for the boot server as reachable by all machines that will use it.
2 : 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 should match the IP of the boot server on the PXE network.
3 : SELinux is enabled. Please review the following wiki page for details on ensuring cobbler works correctly in your SELinux environment:
https://github.com/cobbler/cobbler/wiki/Selinux
4 : change 'disable' to 'no' in /etc/xinetd.d/tftp
5 : 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 you have installed a *recent* version of the syslinux package installed and can ignore this message entirely. Files in this directory, should you want to support all architectures, should include pxelinux.0, menu.c32, elilo.efi, and yaboot. The 'cobbler get-loaders' command is the easiest way to resolve these requirements.
6 : enable and start rsyncd.service with systemctl
7 : debmirror package is not installed, it will be required to manage debian deployments and repositories
8 : The default password used by the sample templates for newly installed machines (default_password_crypted in /etc/cobbler/settings) is still set 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.
~]# systemctl start xinetd.service
~]# systemctl enable xinetd.service
~]# systemctl start rsyncd.service
~]# systemctl enable rsyncd.service
~]# cobbler get-loaders
~]# cobbler sync
~]# systemctl restart cobblerd.service
管理 distro
# 挂载光盘
~]# mkdir /media/cdrom
~]# mount -r -t iso9660 /dev/cdrom /media/cdrom
~]# cobbler import --name=centos7-x86_64-1810 --path=/media/cdrom
task started: 2020-03-02_004519_import
task started (id=Media import, time=Mon Mar 2 00:45:19 2020)
Found a candidate signature: breed=redhat, version=rhel6
Found a matching signature: breed=redhat, version=rhel6
Adding distros from path /var/www/cobbler/ks_mirror/centos7-x86_64-1810:
creating new distro: centos7-1810-x86_64
trying symlink: /var/www/cobbler/ks_mirror/centos7-x86_64-1810 -> /var/www/cobbler/links/centos7-1810-x86_64
creating new profile: centos7-1810-x86_64
associating repos
checking for rsync repo(s)
checking for rhn repo(s)
checking for yum repo(s)
starting descent into /var/www/cobbler/ks_mirror/centos7-x86_64-1810 for centos7-1810-x86_64
processing repo at : /var/www/cobbler/ks_mirror/centos7-x86_64-1810
need to process repo/comps: /var/www/cobbler/ks_mirror/centos7-x86_64-1810
looking for /var/www/cobbler/ks_mirror/centos7-x86_64-1810/repodata/*comps*.xml
Keeping repodata as-is :/var/www/cobbler/ks_mirror/centos7-x86_64-1810/repodata
*** TASK COMPLETE ***
~]# cobbler list
distros:
centos7-1810-x86_64
profiles:
centos7-1810-x86_64
# 自定义 ks 配置文件
~]# cp centos7-x86_64-1810-mini.cfg /var/lib/cobbler/kickstarts/
~]# cobbler profile edit --name=centos7-1810-x86_64 --kickstart=/var/lib/cobbler/kickstarts/centos7-x86_64-1810-mini.cfg
~]# cobbler profile report
Name : centos7-1810-x86_64
TFTP Boot Files : {}
Comment :
DHCP Tag : default
Distribution : centos7-1810-x86_64
Enable gPXE? : 0
Enable PXE Menu? : 1
Fetchable Files : {}
Kernel Options : {}
Kernel Options (Post Install) : {}
Kickstart : /var/lib/cobbler/kickstarts/centos7-x86_64-1810-mini.cfg
Kickstart Metadata : {}
Management Classes : []
Management Parameters : <<inherit>>
Name Servers : []
Name Servers Search Path : []
Owners : ['admin']
Parent Profile :
Internal proxy :
Red Hat Management Key : <<inherit>>
Red Hat Management Server : <<inherit>>
Repos : []
Server Override : <<inherit>>
Template Files : {}
Virt Auto Boot : 1
Virt Bridge : xenbr0
Virt CPUs : 1
Virt Disk Driver Type : raw
Virt File Size(GB) : 5
Virt Path :
Virt RAM (MB) : 512
Virt Type : kvm
~]# cobbler sync
测试
注意客户机最小内存2G
image-20200301172140548.png
image-20200301172244609.png
