Red Hat Red Hat Certifications EX200 Questions & Answers

• Question 41:

  Configure

  your web services, download from http://instructor.example.com/pub/serverX.html And the services must be still running after system rebooting.

  Correct Answer: Check the anser in explanation.

  cd /var/www/html wget http://instructor.example.com/pub/serverX.html mv serverX.html index.html /etc/init.d/httpd restart chkconfig httpd on

• Question 42:

  Create a volume group, and set 8M as a extends. Divided a volume group containing 50 extends on volume group lv (lvshare), make it as ext4 file system, and mounted automatically under /mnt/data. And the size of the floating range should set between 380M and 400M.

  Correct Answer: Check the anser in explanation.

  # fdisk # partprobe # pvcreate /dev/vda6 # vgcreate -s 8M vg1 /dev/vda6 -s # lvcreate -n lvshare -l 50 vg1 -l # mkfs.ext4 /dev/vg1/lvshare # mkdir -p /mnt/data # vim /etc/fstab /dev/vg1/lvshare /mnt/data ext4 defaults 0 0 # mount -a # df -h

• Question 43:

  Please open the ip_forward, and take effect permanently.

  Correct Answer: Check the anser in explanation.

  vim /etc/sysctl.conf net.ipv4.ip_forward = 1

  sysctl –w (takes effect immediately) If no “sysctl.conf” option, use these commands:

  sysctl –a |grep net.ipv4

  sysctl –P net.ipv4.ip_forward = 1

  sysctl -w

• Question 44:

  Create a new logical volume according to the following requirements:

  The logical volume is named database and belongs to the datastore volume group and has a size of 50 extents.

  Logical volumes in the datastore volume group should have an extent size of 16 MB.

  Format the new logical volume with a ext3 filesystem.

  The logical volume should be automatically mounted under /mnt/database at system boot time.

  Correct Answer: Check the anser in explanation.

  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

• Question 45:

  /data Directory is shared from the server1.example.com server. Mount the shared directory that:

  a.

  when user try to access, automatically should mount

  b.

  when user doesn't use mounted directory should unmount automatically after 50 seconds.

  c.

  shared directory should mount on /mnt/data on your machine.

  Correct Answer: Check the anser in explanation.

  1. vi /etc/auto.master /mnt /etc /auto.misc --timeout=50 vi /etc/auto.misc data -rw,soft,intr server1.example.com:/data service autofs restart chkconfig autofs on When you mount the other filesystem, you should unmount the mounted filesystem, Automount feature of linux helps to mount at access time and after certain seconds, when user unaccess the mounted directory, automatically unmount the filesystem. /etc/auto.master is the master configuration file for autofs service. When you start the service, it reads the mount point as defined in /etc/auto.master.

• Question 46:

  Make on data that only the user owner and group owner member can fully access.

  Correct Answer: Check the anser in explanation.

  chmod 770 /data

  Verify using : ls -ld /data Preview should be like:

  drwxrwx--- 2 root sysadmin 4096 Mar 16 18:08 /data

  To change the permission on directory we use the chmod command.

  According to the question that only the owner user (root) and group member (sysadmin) can fully access the directory so: chmod 770 /data

• Question 47:

  Some users home directory is shared from your system. Using showmount -e localhost command, the shared directory is not shown. Make access the shared users home directory.

  Correct Answer: Check the anser in explanation.

  Verify the File whether Shared or not ? : cat /etc/exports

  Start the nfs service: service nfs start

  Start the portmap service: service portmap start

  Make automatically start the nfs service on next reboot: chkconfig nfs on

  Make automatically start the portmap service on next reboot: chkconfig portmap on

  Verify either sharing or not: showmount -e localhost

  Check that default firewall is running on system?

  If running flush the iptables using iptables -F and stop the iptables service.

• Question 48:

  According the following requirements, configure autofs service and automatically mount to user's home directory in the ldap domain.

  - Instructor.example.com (192.168.0.254) has shared /home/guests/ldapuserX home directory to your system by over NFS export, X is your hostname number.

  -LdapuserX's home directory is exist in the instructor.example.com: /home/ guests/ldapuserX

  -LdapuserX's home directory must be able to automatically mount to /home/ guests/ldapuserX in your system.

  -Home directory have write permissions for the corresponding user.

  However, you can log on to the ldapuser1 - ldapuser99 users after verification. But you can only get your corresponding ldapuser users. If your system's hostname is server1.example.com, you can only get ldapuser1's home directory.

  Correct Answer: Check the anser in explanation.

  mkdir –p /home/guests cat /etc/auto.master: /home/guests /etc/auto.ldap cat /etc/auto.ldap: ldapuser1 -rw instructor.example.com:/home/guests/ldapuser1

  automatically mount all the user's home directory #* -rw instructor.example.com:/home/guests/and

• Question 49:

  1.

  Find all sizes of 10k file or directory under the /etc directory, and copy to /tmp/findfiles directory.

  2.

  Find all the files or directories with Lucy as the owner, and copy to /tmp/findfiles directory.

  Correct Answer: Check the anser in explanation.

  (1)find /etc -size 10k -exec cp {} /tmp/findfiles \;

  (2)find / -user lucy -exec cp -a {} /tmp/findfiles \;

  Note: If find users and permissions, you need to use cp - a options, to keep file permissions and user attributes etc.

• Question 50:

  Add 3 users: harry, natasha, tom.

  The requirements: The Additional group of the two users: harry, Natasha is the admin group. The user: tom's login shell should be non-interactive.

  Correct Answer: Check the anser in explanation.

  # useradd -G admin harry # useradd -G admin natasha # useradd -s /sbin/nologin tom # id harry;id Natasha (Show additional group) # cat /etc/passwd (Show the login shell) OR # system-config-users