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RHCSA Commands

Subjects : certifications, it-skills, rhcsa

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Extract a gzipped tar ball in your home directory
yum search firefox
$ tar xzvf home.tar.gz /home
system-config-firewall tui
/dev

2. Repos for yum
/etc/yum.repos.d
#iptables -F
vsftpd
yum search firefox

3. Edit files with cat until the _EOF is found
vsftpd
# vi /etc/inittab change - id:3:initdefault:
/etc/hosts
cat >> some_file << _EOF

4. Copy a public ssh key to server6
rpm --import [public key location]
vncviewer -via student@server6 localhost:2
ssh-copy-id root@server6.example.com
rsync /home root@server6.example.com:/tmp

5. Connect with VNC viewer securely
vncviewer -via student@server6 localhost:2
rpm --import [public key location]
ln -s /pub /var/www/html/pub
/etc/vsftpd/vsftpd.conf rpm -ql vsftpd

6. Start vsftp service
rsync -a /home/test1.html root@server6.example.com:/var/pub
vsftpd restart
# grep -i
rpm -qp pkg.rpm

7. Extract /tmp/etc.tar.gz to /etc
#uname -r
#virsh destroy domain-id
tar xvzf /tmp/etc.tar.gz /etc
2>&1

8. Install a package named firefox4
yum install firefox4
/var/lib/rpm
/var/log/messages
#iptables -F

9. Process packets coming out of the system
IPtables output chain
#uname -r
lftp student@server6 httpd configuration /etc/httpd/conf/httpd.conf rpm -ql httpd
man search :/repository

10. Grep with ignoring case
$ grep -v ^# /etc/nsswitch.conf
# grep -i
IPtables forward chain
rhn_register

11. Extract a star compressed file
#yum grouplist
# star -x -f=home.star
updating the kernel
$ grep -v ^# /etc/nsswitch.conf

12. Append add to the end of the IPtables rules. insert will put rule above the deny all rule.
#yum groupinstall "group name"
system-config-firewall (Push the enable button and check the appropriate boxes. Check.)
ip masqu
insert as opposed to append

13. Search for command in the doc directory
IPtables forward chain
vsftpd
ssh-keygen
# ls -l /usr/share/doc | grep httpd

14. Get more information on a package availale through yum
#yum info [package name]
ntpdate -b instructor
/etc/hosts
IPtables forward chain

15. Install the star compression tool create an archive with the star tool.
# star -xattr -H=exustar -c -f=home.star /home/
tar fzj
/etc/sysconfig/iptables
rsync -PHR /home/test1.html root@server6.example.com:/var/pub

16. Process packets coming into the system
ntpdate -b instructor
IPtables input chain
system-config-firewall tui
yum list

17. Install a pkg.rpm locally
rpm localinstall pkg.rpm --nogpgcheck
/etc/yum.repos.d
/etc/sysconfig/network
/etc/sysconfig/iptables

18. Install the VNC server package
chkconfig vsftpd on
yum install tigervnc-server
/etc/ssh/sshd_config
$ grep -v ^# /etc/nsswitch.conf

19. Shell config tool gropued like GUI firewall configurater.
yum install firefox4
system-config-firewall tui
tar czvf /tmp/etc.tar.gz /etc
rpm localinstall pkg.rpm --nogpgcheck

20. Enable anonymous users - disable local accounts - and disable any uploads to the FTP server
/etc/vsftpd/vsftpd.conf rpm -ql vsftpd
yum info firefox4
yum install tigervnc-server
logwatch

21. Start the GUI for date configuration
ln -s /pub /var/www/html/pub
#yum groupinstall "group name"
system-config-date
MailTo=student@server6.example.com

22. An example of searching through system logs with interpretation.
/etc/hosts
# cat /var/log/messages | grep [Ff]ailed | less
insert as opposed to append
/etc/yum.repos.d/

23. Start a VM
# vi /etc/inittab change - id:3:initdefault:
#iptables -L
# virsh create /etc/libvert/qemu/vm_file_name.xml
#rpm -uvh [package name]

24. System config firewall
/etc/vsftpd/vsftpd.conf rpm -ql vsftpd
vncviewer -via student@server6 localhost:2
GUI menu system/administratrion/firewall
#rpm -qi [package name]

25. Basic add rule for iptables not persistant unless saved with #/etc/init.d/iptables save
insert as opposed to append
#ip addr show
vsftpd
#iptables -I INPUT -p tcp --dport 21 -j Accept

26. Adjust the persistent runlevel
# vi /etc/inittab change - id:3:initdefault:
tar xvzf /tmp/etc.tar.gz /etc
man search :/repository
#iptables -F

27. Generate SSH Keys
rsync -a /home/test1.html root@server6.example.com:/var/pub
ssh-keygen
#yum install [package name]
# renice -10 proc-id

28. Rpm upgrade package u upgrade v verbose h hash
Fully Qualified Domain Name
tar czvf /tmp/etc.tar.gz /etc
#rpm -uvh [package name]
#ip addr show

29. handles dependencies while RPMs do not uses preconfigured repos
#yum
/usr/share/doc/initscripts-*/sysconfig.txt
# yum
yum provides

30. Local host file (contains hostname). Can contain local system DNS.
#yum groupinstall "group name"
/var/log/cron
#iptables -D INPUT -p tcp --dport 21 -j accpet
/etc/hosts

31. List VMs
updating the kernel
/etc/vsftpd/vsftpd.conf rpm -ql vsftpd
#rpm -qi [package name]
#virsh list

32. Searches for page within the #man yum
man search :/repository
/etc/services
/usr/share/doc/initscripts-*/sysconfig.txt
IPtables input chain

33. Send all debug level messages to /var/log/debug.log
/dev
*.debug /var/log/debug.log service rsyslog restart
#yum remove [package name]
/var/lib/rpm

34. Repo config file
chkconfig vsftpd on
/etc/sysconfig/iptables
#virsh destroy domain-id
[repo identifier] name=[repo name] baseurl=[repo url] enabled = 1 gpgcheck = 1 (0 for local system) gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release -file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-beta

35. File holding services - ports - protocols assoicated
yum install firefox4
rsync -PHR /home/test1.html root@server6.example.com:/var/pub
2>&1
/etc/services

36. Disk Utility Command
# virsh create /etc/libvert/qemu/vm_file_name.xml
# cat /var/log/messages | grep [Ff]ailed | less
palimpsest
#rpm -ivh [package name]

37. fqdn
Fully Qualified Domain Name
/var/www/html/
cat >> some_file << _EOF
tar czvf /tmp/etc.tar.gz /etc

38. Stores IPtables rules (filter) chains - input forward output are persistant
/etc/rsyslog.conf
/etc/sysconfig/iptables
#ip addr show
ssh-keygen

39. Authentication related messages log
# cat /var/log/messages | grep [Ff]ailed | less
/var/log/secure
/usr/share/doc/initscripts-*/sysconfig.txt
ntpdate -b instructor

40. Get information about a package named firefox4
tar cxtv
rpm -qc httpd
IPtables output chain
yum info firefox4

41. Configuration file for system logs
/etc/rsyslog.conf
# star -x -f=home.star
/dev
yum provides

42. Grep for lines that do not match (-v)
ssh-keygen
$ grep -v ^# /etc/nsswitch.conf
rsync -PHR /home/test1.html root@server6.example.com:/var/pub
IPtables input chain

43. List iptables
#yum info [package name]
/etc/sysconfig/network
#iptables -L
# yum

44. See files installed with a package named vsftpd
rpm -ql vsftpd
/var/lib/rpm
/etc/services
GUI menu system/administratrion/firewall

45. Where are HTML pages hosted?
/var/www/html/
# renice -10 proc-id
# cat /var/log/messages | grep [Ff]ailed | less
#virsh destroy domain-id

46. Messages related to cron log
/var/log/cron
Fully Qualified Domain Name
cp /home/test1.html /var/www/html/test1.html
rpm localinstall pkg.rpm --nogpgcheck

47. Restart vnc and persist on boot
/etc/sysconfig/vncservers rpm -ql tigervnc-server
#rpm -qa | grep [package name]
yum update
service vncserver restart chkconfig vncserver on

48. Create a tar ball with gzip compression of the home dir
rhn_register
yum search firefox
[repo identifier] name=[repo name] baseurl=[repo url] enabled = 1 gpgcheck = 1 (0 for local system) gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release -file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-beta
$ tar czvf home.tar.gz /home

49. List scripts that can be run after installation of pkg.rpm
#iptables -F
# yum
/var/log/secure
rpm -q pkg.rpm --scripts

50. Gets kernel version and release number
/etc/yum.repos.d/
*.debug /var/log/debug.log service rsyslog restart
cp /home/test1.html /var/www/html/test1.html
#uname -r

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Can you answer 50 questions in 15 minutes?

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RHCSA Commands

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