Note October 29,30

################ #自动安装系统 ############

1.kickstart Script

To automatically answer the system installation process of all the problems of the script file, the system can be installed automatically. After the system is installed, the system will be

Anaconda-ks.cfg This file is the kickstart script generated by this system as a template

2. Manually edit the Kickstart script so much

System-config-kickstart Tools available in the system to make kickstart graphically

Yum Install System-config-kickstart-y # #安装图形制作工具

System-config-kickstart # #打开图形ks制作工具

Ksvalidator Ks.cfg # #检测ks语法

3.kickstart file Sharing

Yum Install Httpd-y

Systemctl Stop Firewalld.service

Systemctl Disable Firewalld.service

Systemctl Start httpd

Systemctl Enable httpd

CP ks.cfg/var/www/html

4. Test the KS file

Virt-install \

>--name kstest \

>--ram 800 \

>--file/var/lib/libvirt/images/kstest.qcow2 \

>--file-size 8 \

>--location ftp://172.25.254.250/pub/rhel7.2 \

>--extra-args "ks=http://172.25.254.100/ks.cfg" &

##### #pxe网络安装服务

1. Corresponding Software Installation

Yum Install DHCP Tftp-server syslinux httpd-y

Systemctl Stop Firewalld.srevice

Systemctl Disable Firewalld.service

Vim/etc/xinetd.d/tftp

"Disable =yes" ========> "Disable = no"

Systemctl Restart xinetd

Systemctl Start httpd

Systemctl Enable httpd

2. Must download and copy files

cp/usr/share/syslinux/pexlinux.0/var/lib/tftpboot/

Copy all isolinux/* from the installation image to/var/lib/tftpboot/

Mkdir/var/lib/tftpboot/pxelinux.cfg

Cp/var/lib/tftpboot/isolinx.cfg/var/lib/tftpboot/pxelinux.cfg/default

################### #用户权限列表

1. Definition of permission list

A record table that special users have special permissions on a file

2. Recognition of permission lists

-rw-rw-r--+ 1 root root Oct 21:20 file

3. View of the Permissions list

Getfacl file

User:: rw-# #特殊指定用户权限

User Permissions

Group:: rw-# #特殊指定组权限

Group Permissions

Mask:: rw-# #权限阀值

Other:: r--# #其他人权限

4. How to set ACL list

Setfacl-m u:username: Permissions filename

setfacl-m u:test:rw File # #指定test用户对file文件特殊权限为读写

Setfacl-x u:student File # #删除列表中的student用户信息

Setfacl-x g:student File # #删除列表中的student用户组信息

Setfacl-b Bile # #关闭列表

5.mask permission Threshold

If you perform chmod on a file that has a special permission list, you may modify the mask in this permission list

Mask Maximum permission value that is available to a particular user

set mask:setfacl-m m: Permissions filename # #修改该mask的值

6. Default Permissions

When we need to create a new file in the specified directory or a directory that has special permissions for the specified user

Setfacl-m d:u:username: Permissions filename

！ Default permissions do not take effect on existing files

default permissions do not take effect on the directory itself

########################## #系统延迟及定时机制

1.at delay

At time

At> Action

At>ctrl +d

At> <EOT>

At-l # # #查看正在进行的任务

ATRM Task number

When an action is executed with output

The output is sent as a message to the person's initiator

Mail # # #打开邮件

Q # # #退出

At user's black and white list

/etc/at.deny # #默认存在并生效

/etc/at.allow # #默认不存在, once present, Etc/at.deny fail

2. Recurring tasks

Command mode initiated

Crontab-u USERNAME-E

MM HH dd mm WW

MM/2 # #每隔2分钟

HH1-HH2 # #多少点到多少点

HH1,HH2 # #多少点和多少点

Crontab-l

Crontab-u Username-r

The way the file originated

Vim/etc/cron.d/filename

MM HH dd mm WW USERNAME action

3. Management of temporary system files

Vim/usr/lib/tmpfiles.d/*.conf

Type filename Perm user group

D/mnt/westos 1777 root root

Systemd-tmpfiles--create/usr/lib/tmpfiles.d/*

Systemd-tmpfiles--clean/usr/lib/tmpfiles.d/*

Note October 29,30