"Red Hat RHEL7.0 edition RHCE exam Experience"

In July 2014, in order to vigorously promote the Redhat Enterprise Linux7 operating system, Red Hat converted the base RHCE authentication from RHEL6 to RHEL7.

In the face of new software functions, the new certification course content, the initial certification of the student's test pass rate has been at a low level, for this reason Red Hat officials also dedicated training institutions for remedial classes, dedicated to finding and discovering training courses problems.

At the same time, the society's training institutions actively grasp the teaching requirements, explore training questions, strengthen the simulation test, with its stability to enhance the student RHCE certification pass rate.

I took the exam on February 15 and passed the test, completed rhcsa,2 hours and completed the RHCE in 1 hours.

1. About Preparation Exercises

(1) Strict scoring standard

The formal certification exam pass or not, depending on the effectiveness of your simulation training, determine whether you can within the specified time, to complete the correct operation, to meet the required requirements. If the enigmatic grading result after the test is not what you expected, it is generally a self-righteous and feeling good in mock training.

Therefore, to Red hat to take the official examination, you must have passed the Training Institute of the mock Test, using Red Hat official standards tested you and passed. Therefore, in another sense, the training institutions must have a professional simulation test and scoring standard script to ensure that you pass the certification exam.

Regarding Red Hat official specific volume standard, the feeling is not all is the result cent, individual will combine the configuration process to divide. If there is time, it is recommended to complete the RH254 in the official course of the experiment, and use the enigmatic grading script enigmatic grading to find the problem point.

(2) Try to simulate real environment and training according to real questions

The results of the formal certification exams are the result of serious concentration, commitment and high standards in your preparation stage. As the online can find a considerable degree of real questions, so after proficiency to a certain extent, you can modify the practice environment, according to the real environment and real questions training several times.

Training is a familiar process of discovering problems, familiar phenomena and solving problems. If there are a variety of problems in the training, the exam will not panic, take the formal test is prepared, otherwise is hollow a cold sweat, heart rate of a psychological collapse experience.

(3) Several technical points

* Failed to start Nm-connection-edit

When you log on to a virtual machine in ssh-x mode, the Nm-connection-edit fails to start. This issue is caused by multiple recovery of the virtual machine, which does not occur if the Rht-vmctl fullreset all is performed on the real machine or the recovery workstation snapshot is restored to virtualization.

For the error that appears, can be executed: Dbus-lanuch nm-connection-editor solve.

* TEAMD Configuration

In the learner practice environment, configuring the team requires a network card. If configured improperly, it will not complete correctly. Please refer to Annex 1 for steps to properly prepare the NIC.

* Auxiliary Test

Sometimes meet the start service error, can directly check the system log/var/log/messages, content display directly;

Apache topic does not come out, you can use the service httpd configtest check configuration, you can directly see/var/log/httpd/error.log,

* Command line Validation test

For Samba and squid services, use the following command to verify:

# smbclient-l//server0-u ldapuser2 Test access rights

# smbclient-l//server0/smb2-u ldapuser2 Test Write permission

Enter password

MD BB

Ls

Apache uses the following two instructions to verify:

Env http_proxy=http://10.32.3.57:8080 Links www.g.cn

# Curl--CACERT/ETC/HTTPD/EXAMPLE-CA.CRT https://server3.example.com:443

# curl-k Http://server3.example.com

# curl-s--raw http://server3.example.com

* Secure NFS Configuration

Note: Service name differences. The service name that the server side needs to start is Nfs-server Nfs-secure-server, and the client name is Nfs-secure

* Configure iSCSI Storage

When configuring Fatab auto mount, be sure to use the UUID followed by the _netdev option.

* Stop iSCSI Service is not working properly

Note: This issue is that you performed an unnecessary login after you used ISCSIADM in Discover. The correct steps are as follows:

# VI/ETC/ISCSI/INITIATORNAME.ISCSI

Initiatorname=iqn.2014-11.com.tianyun:desktop0

# systemctl Restart Iscsid

# iscsiadm--mode discoverydb--type sendtargets--portal Server1--discover

# Systemctl Restart iSCSI

# LSBLK

2. Examination procedure and examination environment

I took the exam on February 15, if the examination room is located in Chaoyang Gate outside the East Bridge Kiu Fuk Building 5 Red Hat China, do not worry about the test environment. Examination computer is DELLPC machine, memory 12G, machine performance is good, restart system speed quite fast.

Take the exam takes * * * and pen, 9:45 check-in can enter the examination room, 10 o'clock on time to start the exam. Morning RHCSA time 2.5 hours, total score 300 minutes, 210 minutes pass. The afternoon exam starts 2:30, RHCE exam time 3.5 hours, total score 300 points, 210 points pass. First, the examiner requires the English language environment, first fill in your name and e-mail address, followed by the registration of the exam information, and signed a guarantee does not leak test questions promised.

After completion, the examiner will push the exam questions and you will see two special exam icons on your desktop. One is the Red Hat icon, click Open is the Web version of the examination papers and questions. The other is the VM console icon, which is a virtual machine control menu that opens with options such as reboot, power off, force shutdown, console,rebuild, and so on. The Console menu item is typically used only. RHCSA set up the network environment, you must log in to the Console menu item, note that the open is a character interface, the root user must log in and enter STARTX, switch to the GUI.

3. On-the-spot examination precautions

Morning RHCSA18 Road Exam, afternoon RHCE21 exam

(1) Operating system root password

Do not make the diagram convenient, when the RHCSA cracked the virtual machine password, the root password is changed to a simple password. Because once the exam is tight, you may forget to change the root password to the test request password, and the examiner does not remind the case, the exam is 0 points.

(2) Configuring the network environment

After the RHCSA network basic Environment configuration is complete, you can ping the virtual machine's domain name from the real machine and verify that the virtual machine's network address is configured correctly. Because the root password and network address are necessary for the examiner to make a volume, improper configuration will result in zero scores.

RHCE network environment is DHCP, but you do not need to modify, you can do the problem directly, no problem.

(3) SElinux

Note that the exam initial environment Seliux to permissive, the configuration file must be modified and set to enforcing. It is recommended to restart the machine immediately after the modification takes effect.

(4) Management of extended partitions

RHCSA the last problem, to create volume groups and logical volumes, you must be aware of how to manage the extended partitions of the disks.

When you use FDISK to partition a disk, there are already three primary partitions, so you need to create a new extended partition. Do not exit when finished, select "N", create a new logical partition for the extended partition, and Partprebo identify the new disk partition when finished.

(5) Dynamic website title cancellation

Red Hat has dynamic website questions in the early exams, but it's almost gone in the February 15 exam.

(5) Restart machine verification configuration

Be sure to restart the machine verification configuration, the first reboot can start the server first, and then start desktop.

February 17, 2015

Annex 1-Procedure for TEAMD configuration in a trainee training environment

Do the following for server and desktop, respectively.

(1) Add the first NIC

On the real desktop, click Application---select System Tools--Select virtual machine Manager from the top left corner

Click Open Server virtual machine, click Open Lamp icon, select Add Hardware, select network-> Host device Select Br0, deicemod select Virtio

(2) Add a second network card

Repeat the above steps,

On the real desktop, click Application---select System Tools--Select virtual machine Manager from the top left corner

Click Open Desktop Virtual machine, click to open the Lamp icon, select Add Hardware, select network-> Host device Select Br0, deicemod select Virtio

(3) Configuring the NIC Team

Click the desktop icon to open the virtual machine desktop

Log in as root and perform the following configuration operation

# Nm-connect-editor

Configure the team for the dual NIC.

"NOTE: Enter the following information in the man teamd.conf in JSON"

{

"Device": "Team0",

"Runner": {"name": "Activebackup"},

"Link_watch": {

"Name": "Ethtool",

"DELAY_UP": 2500,

"Delay_down": 1000

},

"Ports": {

"Eth1": {

"Prio":-10,

"Sticky": true

},

"Eth2": {

"Prio": 100

}

}

}

[Email protected] desktop]# NMCLI connection Show

[Email protected] desktop]# nmcli connection up "team0-connection-1"

[Email protected] desktop]# Teamdctl TEAM0 State

Setup

Runner:activebackup

Ports

Eth1

Link watches:

Link Summary:up

INSTANCE[LINK_WATCH_0]:

Name:ethtool

Link:up

Eth2

Link watches:

Link Summary:up

INSTANCE[LINK_WATCH_0]:

Name:ethtool

Link:up

Runner

Active Port:eth1

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"Red Hat RHEL7.0 edition RHCE exam Experience"