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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. Set a VNC password
$ grep -v ^# /etc/nsswitch.conf
2>&1
vncpasswd
*.debug /var/log/debug.log service rsyslog restart

2. Get a list of package groups from yum
IPtables input chain
#yum grouplist
rsync -a /home/test1.html root@server6.example.com:/var/pub
#yum

3. GUI File Manager
ip masqu
service sshd restart
tar xvzf /tmp/etc.tar.gz /etc
nautilus

4. Location of repo's
vncpasswd
# virsh create /etc/libvert/qemu/vm_file_name.xml
[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
/etc/yum.repos.d/

5. Adjust the persistent runlevel
#iptables -I INPUT -p tcp --dport 21 -j Accept
#yum remove [package name]
# vi /etc/inittab change - id:3:initdefault:
chkconfig httpd on

6. Remote copy /home/test1.html to the /var/pub directory on server6 with progress - preserving hard links - and using relative path names
ssh-keygen
rsync -a /home/test1.html root@server6.example.com:/var/pub
# renice -10 proc-id
rsync -PHR /home/test1.html root@server6.example.com:/var/pub

7. File holding services - ports - protocols assoicated
/var/log/messages
ln -s /pub /var/www/html/pub
rsync /home/test1.html root@server6.example.com:/var/pub
/etc/services

8. Update a package
yum update
rpm -qc httpd
yum install tigervnc-server
# yum

9. fqdn
Fully Qualified Domain Name
rpm --import [public key location]
service ntpd restart
tar fzj

10. Extract a star compressed file
/var/log/cron
# star -x -f=home.star
yum remove firefox4
#iptables -I INPUT -p tcp --dport 21 -j Accept

11. Enable anonymous users - disable local accounts - and disable any uploads to the FTP server
#rpm -ivh [package name]
/etc/vsftpd/vsftpd.conf rpm -ql vsftpd
# renice -10 proc-id
nautilus

12. List VMs
#virsh list
# star -x -f=home.star
# renice -10 proc-id
/dev

13. Persist FTP on boot
chkconfig vsftpd on
rsync /home root@server6.example.com:/tmp
#rpm -uvh [package name]
cp /home/test1.html /var/www/html/test1.html

14. Kill a VM
#rpm -qad [package name]
#virsh destroy domain-id
/etc/hosts
man search :/repository

15. List iptables
rpm -q pkg.rpm --scripts
rhn_register
cp /home/test1.html /var/www/html/test1.html
#iptables -L

16. Display packages that match the pathname
yum provides
# cat /var/log/messages | grep [Ff]ailed | less
/etc/sysconfig/iptables
rpm --import [public key location]

17. Disks available for partitions
/dev
cat >> some_file << _EOF
IPtables input chain
#rpm -qa | grep [package name]

18. Create a tar ball with gzip compression of the home dir
rsync -a /home/test1.html root@server6.example.com:/var/pub
vncviewer -via student@server6 localhost:2
$ tar czvf home.tar.gz /home
rhn_register

19. Use lftp to connect
lftp student@server6 httpd configuration /etc/httpd/conf/httpd.conf rpm -ql httpd
*.debug /var/log/debug.log service rsyslog restart
/etc/sysconfig/network
yum update

20. Backup a home directory on desktop6 to /tmp on server6
yum install tigervnc-server
rsync /home root@server6.example.com:/tmp
insert as opposed to append
/var/lib/rpm

21. Generate SSH Keys
tar xvzf /tmp/etc.tar.gz /etc
ssh-keygen
logwatch
/var/log/messages

22. Install a pkg.rpm locally
/etc/vsftpd/vsftpd.conf rpm -ql vsftpd
vsftpd
rpm localinstall pkg.rpm --nogpgcheck
#yum grouplist

23. Stores IPtables rules (filter) chains - input forward output are persistant
GUI menu system/administratrion/firewall
/etc/sysconfig/iptables
ntpdate -b instructor
#iptables -L

24. Stores filewall rules for the system.
rpm -qp pkg.rpm
yum search firefox
/etc/sysconfig/iptables
#rpm -qad [package name]

25. Shell config tool gropued like GUI firewall configurater.
# star -xattr -H=exustar -c -f=home.star /home/
system-config-firewall tui
#rpm -qa | grep [package name]
rpm localinstall pkg.rpm --nogpgcheck

26. An example of searching through system logs with interpretation.
rpm -ql vsftpd
# cat /var/log/messages | grep [Ff]ailed | less
/var/log/messages
vsftpd

27. List installed and available packages
rsync -PHR /home/test1.html root@server6.example.com:/var/pub
vsftpd
yum list
/etc/yum.repos.d

28. Authentication related messages log
rsync -PHR /home/test1.html root@server6.example.com:/var/pub
# renice -10 proc-id
/var/log/secure
IPtables input chain

29. Restart ssh services
# star -x -f=home.star
service sshd restart
#yum remove [package name]
/dev

30. Repos for yum
system-config-firewall (Push the enable button and check the appropriate boxes. Check.)
tar fzj
IPtables forward chain
/etc/yum.repos.d

31. Acting as a router with forwarding
ip masqu
service ntpd restart
#yum
/var/lib/rpm

32. Remove a package with yum
chkconfig vsftpd on
rsync -PHR /home/test1.html root@server6.example.com:/var/pub
2>&1
#yum remove [package name]

33. Get information about a package named firefox4
rpm -q pkg.rpm --scripts
MailTo=student@server6.example.com
yum info firefox4
#yum groupinstall "group name"

34. FTP package used in RHEL 6
.spec
yum remove firefox4
#rpm -ivh [package name]
vsftpd

35. Repo config file
name-version-release.architecture.rpm
ln -s /pub /var/www/html/pub
tar fzj
[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

36. handles dependencies while RPMs do not uses preconfigured repos
#yum info [package name]
#virsh list
yum install firefox4
#yum

37. Should be done with yum and install as opposed to update if done with RPM option "i" should be used and not "u"
rpm -qp pkg.rpm
/etc/sysconfig/iptables
updating the kernel
*.debug /var/log/debug.log service rsyslog restart

38. Rpm upgrade package u upgrade v verbose h hash
#rpm -uvh [package name]
/usr/share/doc/initscripts-*/sysconfig.txt
# renice -10 proc-id
/var/log/secure

39. System config firewall
#yum info [package name]
rpm -qp pkg.rpm
service ntpd restart
GUI menu system/administratrion/firewall

40. Search for a package within all packages
GUI menu system/administratrion/firewall
system-config-firewall (Push the enable button and check the appropriate boxes. Check.)
#rpm -qa | grep [package name]
/var/log/cron

41. Process packets being forwarded through the system
IPtables forward chain
logwatch
yum update
/etc/yum.repos.d

42. See files installed with a package named vsftpd
.spec
rpm -ql vsftpd
# vi /etc/inittab change - id:3:initdefault:
/var/log/maillog

43. Send all debug level messages to /var/log/debug.log
*.debug /var/log/debug.log service rsyslog restart
yum install firefox4
/etc/vsftpd/vsftpd.conf rpm -ql vsftpd
/var/log/maillog

44. Connect with VNC viewer securely
vncviewer -via student@server6 localhost:2
#iptables -F
IPtables output chain
/etc/sysconfig/iptables

45. Process packets coming into the system
ntpdate -b instructor
IPtables input chain
ssh-keygen
/etc/services

46. Remove a package named firefox4
# cat /var/log/messages | grep [Ff]ailed | less
#yum groupinstall "group name"
$ grep -v ^# /etc/nsswitch.conf
yum remove firefox4

47. Sync ntp time with the instructor
/etc/sysconfig/network
yum remove firefox4
#rpm -qa | grep [package name]
ntpdate -b instructor

48. Start the GUI for date configuration
/etc/sysconfig/iptables
/var/log/cron
system-config-date
/var/log/messages

49. Basic add rule for iptables not persistant unless saved with #/etc/init.d/iptables save
#iptables -I INPUT -p tcp --dport 21 -j Accept
yum install tigervnc-server
# star -x -f=home.star
nautilus

50. Local host file (contains hostname). Can contain local system DNS.
cp /home/test1.html /var/www/html/test1.html
#yum grouplist
/etc/hosts
# star -x -f=home.star

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Can you answer 50 questions in 15 minutes?

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RHCSA Commands

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