練習題

IPADDR: 172.25.x.100(X 在這裏指您的工做站編號)

NETMASK: 255.255.255.0

GATEWAY: 172.25.x.254

DNS: 172.25.254.254

yum源地址爲：ftp://172.25.x.250/pub/rhel7.0

 

1.

在進行考試以前,請先重置根用戶密碼爲 examwestos

 

2.

更改主機名稱爲 station.domainX.example.com(X 在這裏指您的工做站編號)

[root@desktop Desktop]# hostnamectl set-hostname station.domain49.example.com

3

新建組,名稱爲 sysadms,指定其 GID 爲 600

[root@station Desktop]# groupadd -g 600 sysadms

4

新建用戶 tommy,指定 UID 爲 2013,配置該用戶密碼爲 redhat

[root@station Desktop]# useradd -u 2013 tommy

[root@station Desktop]# passwd tommy

Changing password for user tommy.

New password:

BAD PASSWORD: The password is shorter than 8 characters

Retype new password:

passwd: all authentication tokens updated successfully.

5

新建用戶 Jimmy,,而且禁止該用戶交互式登陸,配置該用戶密碼爲 redhat

[root@station Desktop]# useradd -s /sbin/nologin Jimmy

[root@station Desktop]# passwd Jimmy

Changing password for user Jimmy.

New password:

BAD PASSWORD: The password is shorter than 8 characters

Retype new password:

passwd: all authentication tokens updated successfully.

6

新建用戶 natasha,harry, 並將這兩個用戶加入到 sysadms 組當中,做爲從屬組,若是須要,則將用戶密碼配置爲 redhat

[root@station Desktop]# useradd -G sysadms natasha

[root@station Desktop]# useradd -G sysadms harry

[root@station Desktop]# id harry

uid=2016(harry) gid=2016(harry) groups=2016(harry),600(sysadms)

[root@station Desktop]# id natasha

uid=2015(natasha) gid=2015(natasha) groups=2015(natasha),600(sysadms)

7

在/home 目錄中建立目錄 materials,配置該目錄的所屬組爲 sysadms,要求隸屬於 sysadms 組當中的成員對該目錄有讀寫權限,在sysadms目錄當中建立的文件或者文件夾,其所屬組也

自動繼承 sysadms 的所屬組

[root@station Desktop]# mkdir /home/materials/

[root@station Desktop]# chgrp sysadms /home/materials/

[root@station Desktop]# chmod g+s /home/materials/

[root@station Desktop]# ll -d /home/materials/

drwxr-sr-x. 2 root sysadms 6 Nov  2 21:59 /home/materials/

 

拷貝/etc/fstab 文件到/var/tmp 目錄中,設置如下需求

[root@station Desktop]# cp /etc/fstab /var/tmp/

使 harry 用戶對該文件無任何權限

[root@station Desktop]# setfacl -m u:harry:0 /var/tmp/

使 natasha 對該文件有徹底控制權限

[root@station Desktop]# setfacl -m u:natasha:7 /var/tmp/

配置文件所屬用戶爲 root

[root@station Desktop]# chown root /var/tmp/

配置文件所屬組爲 root

[root@station Desktop]# chgrp root /var/tmp/

其餘全部用戶對文件擁有讀權限

[root@station Desktop]# chmod o+r /var/tmp/

其餘全部用戶對文件沒有執行權限

[root@station Desktop]# chmod o-x /var/tmp/

[root@station Desktop]# getfacl /var/tmp/

getfacl: Removing leading '/' from absolute path names

# file: var/tmp/

# owner: root

# group: root

# flags: --t

user::rwx

user:natasha:rwx

user:harry:---

group::rwx

mask::rwx

other::rw-

 

9

設置 NTP 客戶端,與172.25.x.254進行時間同步

客戶端：

[root@station Desktop]# vim /etc/chrony.conf

[root@station Desktop]#  systemctl stop firewalld

[root@station Desktop]# systemctl disable firewalld

[root@station Desktop]# systemctl restart chronyd.service

服務器：

[root@foundation49 ~]# vim /etc/chrony.conf

[root@foundation49 ~]# systemctl stop firewalld

[root@foundation49 ~]# systemctl disable firewalld

[root@foundation49 ~]# systemctl restart chronyd.service

測試：

[root@station Desktop]# chronyc sources -v

210 Number of sources = 1

 

10

找出用戶組mail 擁有的文件,而且將它們放到/root/findresults 目錄中

[root@station Desktop]# find / -group mail

find: ‘/proc/3257’: No such file or directory

find: ‘/proc/3275/task/3275/fd/6’: No such file or directory

find: ‘/proc/3275/task/3275/fdinfo/6’: No such file or directory

find: ‘/proc/3275/fd/6’: No such file or directory

find: ‘/proc/3275/fdinfo/6’: No such file or directory

/var/spool/mail

/var/spool/mail/rpc

/var/spool/mail/student

/var/spool/mail/shengchan

/var/spool/mail/caiwu

/var/spool/mail/jishu

/var/spool/mail/tom

/var/spool/mail/leo

/var/spool/mail/admin

/var/spool/mail/mi

/var/spool/mail/iphone

/var/spool/mail/huawei

/var/spool/mail/root

/var/spool/mail/tommy

/var/spool/mail/Jimmy

/var/spool/mail/natasha

/var/spool/mail/harry

11

[root@station Desktop]# cp -r /var/spool/mail/ /root/findresults

在文件/usr/share/mime/packages/freedesktop.org.xml 中查找全部包含 ich 的行,將找

出的行按照前後順序拷貝到/root/lines

文件中,/root/lines 文件不包含空格,而且其中行的內容是源文件/usr/share/mime/packages/freedesktop.org.xml 原始行的準確副本

[root@station Desktop]# grep 'ich' /usr/share/mime/packages/freedesktop.org.xml > /root/lines

[root@station Desktop]# vim /root/lines