EX200 Online Practice Questions and Answers

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crontab –e –u natasha 23 14/bin/echo hiya crontab -l -u natasha // view systemctlenable crond systemcdlrestart crond

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# cd /etc/yum.repos.d # vim local.repo [local] name=local.repo baseurl=file:///mnt enabled=1 gpgcheck=0 # yum makecache # yum install -y vsftpd # service vsftpd restart # chkconfig vsftpd on # chkconfig --list vsftpd # vim /etc/vsftpd/vsftpd.conf anonymous_enable=YES

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vim/etc/yum.repos/base.repo [base] name=base baseurl= http://server.domain11.example.com/pub/x86_64/Server gpgcheck=0 enable=1 Save and Exit Use yum list for validation, the configuration is correct if list the package information. If the Yum configuration is not correct then maybe cannot answer the following questions.

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grep seismic /usr/share/dict/words> /root/wordlist

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fdisk -cu /dev/vda partx -a /dev/vda pvcreate /dev/vdax vgcreate datastore /dev/vdax -s 16M lvcreate-l 50 -n database datastore mkfs.ext3 /dev/datastore/database mkdir /mnt/database mount /dev/datastore/database /mnt/database/ df -Th vi /etc/fstab /dev/datastore /database /mnt/database/ ext3 defaults 0 0 mount -a

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# useradd -u 1234 alex # passwd alex alex111 alex111 OR echo alex111|passwd -stdin alex

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When you Boot the System, it starts on default Runlevel specified in /etc/inittab:

Id:?:initdefault:

When System Successfully boot, it will ask for username and password. But you don't know the root's password. To change the root password you need to boot the system into single user mode. You can pass the kernel arguments from the

boot loader.

1.

Restart the System.

2.

You will get the boot loader GRUB screen.

3.

Press a and type 1 or s for single mode ro root=LABEL=/ rhgb queit s

4.

System will boot on Single User mode.

5.

Use passwd command to change.

6.

Press ctrl+d

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chmod 770 /archive

Verify using : ls -ld /archive Preview should be like: drwxrwx--- 2 root sysuser 4096 Mar 16 18:08 /archive To change the permission on directory we use the chmod command. According to the question that only the owner user (root) and group member (sysuser) can fully access the directory so: chmod 770 /archive

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cd /usr/local tar –jcvf /root/backup.tar.bz2

mkdir /test tar –jxvf /root/backup.tar.bz2 –C /test// Decompression to check the content is the same as the /usr/loca after If the questions require to use gzip to compress. change –j to –z.

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# cd /root; wget ftp://192.168.0.254/pub/boot.iso # mkdir -p /media/cdrom # vim /etc/fstab /root/boot.iso /media/cdrom iso9660 defaults,loop 0 0 # mount -a mount [-t vfstype] [-o options] device dir

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First check the size of Logical Volume: lvdisplay /dev/vo/myvol

Make sure that the filesystem is in a consistent state before reducing: # fsck -f /dev/vo/myvol

Now reduce the filesystem by 200MB. # resize2fs /dev/vo/myvol 200M

It is now possible to reduce the logical volume. #lvreduce /dev/vo/myvol -L 200M

Verify the Size of Logical Volume: lvdisplay /dev/vo/myvol

Verify that the size comes in online or not: df -h

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cd;umount /shrink e2fsck -f /dev/mapper/vgsrv-shrink resize2fs /dev/mapper/vgsrv-shrink 220M lvreduce -L 220M /dev/mapper/vgsrv-shrink mount -a

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#system-config-date Note: dialog box will open in that Check mark Synchronize date and time over network. Remove all the NTP SERVER and click ADD and type server.domain11.example.com ****************And then press ENTER and the press OK***************

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*

[root@node1 ~]# crontab -l -u natasha

no crontab for natasha

[root@node1 ~]# crontab -e -u natasha

23 14 * * * /bin/echo hello

*/2 * * * * /bin/echo 2min

crontab: installing new crontab

[root@node1 ~]# crontab -l -u natasha

23 14 * * * /bin/echo hello

*/2 * * * * /bin/echo 2min

[root@node1 ~]# systemctl status crond.service

*

### For Checking ###

[root@node1 ~]# tail -f /var/log/cron

Mar 23 13:23:48 node1 crontab[10636]: (root) REPLACE (natasha) Mar 23 13:23:48 node1 crontab[10636]: (root) END EDIT (natasha) Mar 23 13:23:50 node1 crontab[10638]: (root) LIST (natasha) Mar 23 13:24:01 node1 crond[1349]: (root)

FAILED (loading cron table) Mar 23 13:24:02 node1 CROND[10673]: (natasha) CMD (/bin/echo 2min)

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[root@node2 ~]# tuned-adm list [root@node2 ~]# tuned-adm active Current active profile: virtual-guest [root@node2 ~]# tuned-adm recommend virtual-guest [root@node2 ~]# tuned-adm profile virtual-guest [root@node2 ~]# tuned-adm active Current active profile: virtual-guest [root@node2 ~]# reboot [root@node2 ~]# tuned-adm active Current active profile: virtual-guest