EX300 : Red Hat Certified Engineer - RHCE Exam

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EX300
Red Hat Certified Engineer - RHCE
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Question #29 Section 2
Create a Shell script /root/program:
The shell script will come back to "user" parameter when you are entering "kernel" parameter.
The shell script will come back to "kernel" when you are entering "user" parameter.
It will output the standard error when this script "usage:/root/program kernel|user" don’t input any parameter or the parameter you
inputted is entered as the requirements.
Answer: See Explanation
[root@server1 virtual]# cat /root/program
#!/bin/bash param1="$1"
if [ "$param1" == "kernel" ]; then echo "user"
elif [ "$param1" == "user" ]; then echo "kernel" else
echo "usage:/root/program kernel|user" fi
[root@server1 ~]# chmod +x /root/program
Question #30 Section 2
Given the kernel of a permanent kernel parameters: sysctl=1.
It can be shown on cmdline after restarting the system.
Kernel of /boot/grub/grub.conf should be added finally, as:
Answer: See Explanation
Kernel of /boot/grub/grub.conf should be added finally, as:
kernel /vmlinuz-2.6.32-279.1.1.el6.x86_64 ro root=/dev/mapper/vgsrv-root rd_LVM_LV=vgsrv/root rd_NO_LUKS
LANG=en_US.UTF-8 -
rd_LVM_LV=vgsrv/swap rd_NO_MD
SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYTABLE=us rd_NO_DM rhgb quiet rhgb quiet sysctl=1
KEYBOARDTYPE=pc
Question #31 Section 2
Forbidden the Mary user configuration tasks in your system.
Answer: See Explanation
Modify the /etc/cron.deny, add:
[root@server1 ~]# cat /etc/cron.deny mary
Conclusions:
1. I find that it is common to add various service access limits in the exam RHCE. The exercises like: require one network segment
can be accessed another network segments can not be accessed, the following are some conclusions for various service:
tcp_wrappers:/etc/hosts.allow,/etc/hosts.deny tcp_wrappers can filter the TCPs accessing service. TCP whether has the filtering
function which depends on this service whether use the function library of tcp_wrappers, or this service whether has the xinetd
process of starting function of tcp_wrappers. tcp_wrapperss main configuration file is /etc/hosts.allow,/etc/ hosts.deny.
And the priority of the documents in hosts. allow is higher than hosts. deny. Visit will be passed if no match was found. sshd,vsftpd
can use the filtering service of tcp_wrappers.
Configuration example:
150.203.6.66
sshd:.example.com 192.168.0. 192.168.0.0/255.255.255.0 150.203. EXCEPT
Notice:
The two configuration files syntax can refer to hosts_access(5) and hosts_options(5) sshd_config
There are four parameters in this configuration file: DenyUsers, AllowUsers, DenyGroups, AllowGroups, they are used to limit
some users or user groups to proceed Remote Login through the SSH. These parameters priority level is DenyUsers->AllowUsers-
>DenyGroups->AllowGroups Configuration example:
AllowUsers tim rain@192.168.1.121 kim@*.example.com
httpd Service
Through the /etc/httpd/conf/httpd.conf in parameters, can add to control the url access. Just as:

DocumentRoot /var/http/virtual -
ServerName www1.example.com -
Options Indexes MultiViews FollowSymlinks order deny,allow deny from all allow from
192.168.0.


Notice:
So pay attention, denys and allows priority level in order deny,allow is: the backer has the higher priority level. But here, allows
priority has a higher priority level.
nfs Service
nfs service directly control the visits through file /etc/exports, just as:
/common *.example.com(rw,sync) 192.168.0.0/24(ro,sync)
samba Service
Parameter hosts allow in /etc/samba/smb.conf which is used as Access Control,just as: hosts allow = 192.168.0.
192.168.1.0/255.255.255.0 .example.com
2. Paying attention to use Mount parameters: _netdev,defaults when you are mounting ISCSI disk.
3. Stop the NetworkManager
/etc/init.d/NetworkManager stop
chkconfig NetworkManager off
5. When you are deploying ifcfg-ethX, add parameters:
PEERDNS=no -
6. Empty the firewall in RHCSA, RHCE:
iptables -F
iptables -X
iptables -Z
/etc/init.d/iptables save
7. Narrow lv steps:
1.umount /dev/mapper/lv
2.e2fsck -f /dev/mapper/lv
3.resize2fs /dev/mapper/lv 100M
4.lvreduce -L 50M /dev/mapper/lv
5.mount -a
8. Mount the using command - swap which is newly added in /etc/fstab
9. If Verification is not passed when you are installing software, can import public key: rpm import /etc/pki/rpm/release and so on.
In yum.repo, you also can deploy gpgkey, for example, gpgkey=/etc/pki/rpm/release
10. When you are using "Find" command to search and keep these files, paying attention to use cp -a to copy files if you use user
name and authority as your searching methods.
Question #32 Section 2
Please set the selinux status as enforcing.
Answer: See Explanation
# getenforce 1
# vim /etc/sysconfig/selinux
SELINUX=enforcing
Question #33 Section 2
Please open the ip_forward, and take effect permanently.
Answer: See Explanation
# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
(takes effect immediately)
# sysctl -w
If no "sysctl.conf" option, use these commands:
# sysctl -a |grep net.ipv4
# sysctl -P net.ipv4.ip_forward = 1
# sysctl -w
Question #34 Section 2
Configure ssh to allow user harry to access, reject the domain t3gg.com (172.25.0.0/16) to access.
Answer: See Explanation
# yum install -y sshd
# chkconfig sshd on
# vim /etc/hosts.deny
sshd: 172.25.0.0/16
# service sshd restart
Use iptables:
# chkconfig iptables on
# iptables -F
# iptables -X
# iptables -Z
# iptables -nvL
# iptables -A INPUT -s 172.25.0.0/16 -p tcp --dport 22 -j REJECT
# services iptables save
# iptables -nvL
check port)
# cat /etc/services (
Question #35 Section 2
Configure the ftp to allow anonymously download the directory /var/ftp/pub, and reject the domain t3gg.com to access.
Answer: See Explanation
# yum install -y vsftpd
# chkconfig vsftpd on
# services vsftpd start
# vim /etc/hosts.deny
vsftpd: 172.25.0.0/16
OR -
# iptables -A INPUT -s 172.25.0.0/16 -p tcp -dport 20:21 -j REJECT
# services iptables save
Question #36 Section 2
Shutdown the /root/cdrom.iso under /opt/data, and set as boot automatically mount.
Answer: See Explanation
# cd /opt/
# mkdir data
# mount -t iso9660 -o loop /root/cdrom.iso /opt/data
# vim /etc/fstab
/root/cdrom.iso /opt/data iso9660 defaults,loop 0 0
# mount -a
# mount
vi /etc/fstab
192.168.0.254:/data / common nfs defaults 0 0
reboot the system.

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