rhce习题集rhel7

1. 破密：

   e-->linux16 rd.break Ctrl+x-->mount -o remount,rw /sysroot-->chroot /sysroot-->echo flectrag|passwd --stdin root-->touch /.autorelabel-->Ctrl+D-->reboot

2. 修改hostname和ip地址

   nm-connector-editor

   IPADDR0-->PREFIX0-->GATEWAY0-->DNS1-->DOMAIN

   chattr +i /etc/resolv.conf

   hostnamectl set-hostname example.com

3. yum.repos.d/rhel.repo

   [yumserver]

   name=yumserver

   baseurl=http:///

   gpgcheck=0

   enabled=1

4. lvm

   ext4: 增大 lvextend -L 300M /dev/vg1/lv1 resize2fs /dev/vg1/lv1

   xfs:       xfs_growfs /mountpoint

         减小 umount /dev/vg1/lv1 e2fsck -f /dev/vg1/lv1 resize2fs /dev/vg1/lv1 100M

              lvreduce -L 100M /dev/vg1/lv1 mount -a

5. resize2fs /dev/vg1/lv1

6. groupadd adminuser

   useradd natasha -G adminuser

   useradd harry -G adminuser

   useradd sarah -s /sbin/nologinb

   passwd natasha harry sarah

7. cp /etc/fstab /var/tmpfsta

   setfacl -m u:natasha:rw /var/tmp/fstab

   setfacl -m u:harry:- /var/tmp/fstab

8. crontab -e -u natasha

   23 14 * * * /bin/echo hiya

9. mkdir /home/admins

   chgrp adminuser /home/admins

   chmod 2770 /home/admins

10. ftp  get  rpm  vi /etc/grub.conf修改默认启动内核

11. yum install authconfig-gtk

12. vim /etc/chrony.conf

    systemctl restart chronyd.service (enable)

13. useradd -u 1234 alex

14. fdisk /dev/vdb n-->e-->E-->E ；fdisk /dev/vdb n-->l-->E-->+500M-->E-->t-->82-->w

    part -a /dev/vdb

    mkswap /dev/vdb6

    UUID

    vim /etc/fstab

    UUID  swap swap  defaults 0 0

    swapon -a

15. mkdir /root/findfiles

    find / -user ira -exec cp {} /root/findfiles \;

16. grep 'semisc' /usr/share/dict/words /root/wordlist

17.