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Free Download Latest 2014 Pass4sure&Lead2pass Red Hat RHCE EX300 Exam Questions (11-15)

Question 11
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.

[[email protected] virtual]# cat /root/program
if [ “$param1” == “kernel” ]; then
echo “user”
elif [ “$param1” == “user” ]; then
echo “kernel”
echo “usage:/root/program kernel|user”
[[email protected] ~]# chmod +x /root/program

Question 12
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:

Kernel of /boot/grub/grub.conf should be added finally, as:

kernel /vmlinuz-2.6.32-279.1.1.el6.x86_64 ro
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 KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
rhgb quiet sysctl=1

Question 13
Forbidden the Mary user configuration tasks in your system.

Modify the /etc/cron.deny, add:

[[email protected] ~]# cat /etc/cron.deny

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 can filter the TCP’s 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_wrappers’s 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: 192.168.0. 150.203. EXCEPT
The two configuration files’ syntax can refer to hosts_access(5) and  hosts_options(5)
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 [email protected] [email protected]*
httpd Service
Through the /etc/httpd/conf/httpd.conf in parameters, can add <Directory> to control the url access. Just as:
<VirtualHost *:80>
DocumentRoot /var/http/virtual
<Directory /var/http/virtual/limited>
Options Indexes MultiViews FollowSymlinks
order deny,allow
deny from all
allow from 192.168.0.
So pay attention, deny’s and allow’s priority level in order deny,allow is: the backer has the higher priority level. But here, allow’s priority has a higher priority level.

nfs Service
nfs service directly control the visits through file /etc/exports, just as:
/common *,sync),sync)

samba Service
Parameter hosts allow in /etc/samba/smb.conf which is used as Access Control,just as:
hosts allow = 192.168.0.
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
4. When you are deploying ifcfg-ethX, add parameters:
5. Empty the firewall in RHCSA、RHCE:
iptables -F
iptables -X
iptables -Z
/etc/init.d/iptables save
6. 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
7. Mount the using command – swap which is newly added in /etc/fstab
8. 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
9. 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.


Part 2
Question 14
Please set the selinux status as enforcing.

  # getenforce 1
  # vim /etc/sysconfig/selinux

Question 15
Please open the ip_forward, and take effect permanently.

   # 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

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