take a look at the RedHat LINUX Course settings. As we said in "a dark horse in international IT certification-RHCE. DOC", red hat officially divided the RHCE examination into two levels: expert level and standard level. Among them, the standard level is set for most candidates who have no experience in UNIX/LINUX system management. There are three main courses: RH033 (Introduction to red hat linux) for th
allow_postfix_local_write_mail_spool onSet Postfix SELinux PermissionsThe above SELinux boolean value allows Postfix on the central server to write to the Mail pool (mail spool). #p # pagination Title #e#6. Restart the service on both machines for the changes to take effect:
#systemctlrestart postfix
If Postfix does not start correctly, you can use the following command for error handling.
#systemctl-l status postfix
#journalctl-xn
#postconf-n
Test Postfix Ma
It has been about 3 months since December 8, when the post of a junior network engineer entered the network. This period of time is not less consulting friends, their own groping.Originally planned is to follow CCNA has been to CCIE, didn't think now decided to test RHCE turn to the system. So do not know the future of the road will be how, but efforts will certainly not let themselves down.Since March, it is now 20 days, the morning exam RHCSA conten
Recently studying the RHCE course, simply talk about how to use HTTP as the KVM VM network installation process, then also will be talked about Ftp+http+kickstart release, as well as PXE installation Rhel.Environment:Virtual Host: RHEL 7.0Hardware: 4vcpu+8g+40gdiskIP Address: 172.16.38.10I first install the VMware Workstation 12 on the notebook, and create a new RHEL7 virtual machine as the host (this step omitted, need VM12 and RHEL7, will be in my s
This RHCE Study Notes include common dhcp applications, assigned fixed ip addresses, relay proxy 1. in the experiment environment, set up four CentOS5.4 virtual machines, which are S (dhcpserver), A (dhcp-client), R (route), and B (relay proxy) Nic configurations as follows: /etc/sysconfig/network-scripts/The ifcfg-eth0 or eth1S: DEVICE = eth0 n
This RHCE Study Notes include common dhcp applications, assig
RHCE Simulation Exam configuration Samba service, share out/groupdir directory, requires only 192.168.0.0/24 and 192.168.1.0/24 and 127.0.0.1 can access, share out the name is [common], users can not see, Only the student group has the Write permission, at the same time, to the student group of each user's home directory is also shared, and requires selinux must be enforcing. This will prevent Samba from logging on.The solution is to change the SELinu
the heart.
Start Learning Linux:
(i) reading introductory books:
1 Brother Bird's Linux private Kitchens basic articles and server articles
# This is two books, if you don't have a server base, I suggest you just start looking at basic articles
2) wiley.linux.command.line.and.shell.scripting.bible.may.2008
# The best English primer, you can try to read it, it's great
(ii) Registration of a blog
There is nothing to say, when you get started (mastered dozens of kinds of commands), you should sta
Installing packages with Yum is quick and easy, with several software libraries from CentOS and other Third-party developers with software components outside of the default repositories of base and updates to meet your needs, which have varying degrees of stability within the CentOS community, Support and cooperation.
Here are a few examples of software libraries:
1. Rpmforge
This software library is primarily maintained by DAG, providing more than 10,000 CentOS components, including MPlayer,
RHCE experiment: xinetd-Based Access Control-Linux Enterprise Application-Linux server application information. See the following for details. Course Background: RH253
Requirement: configure the telnet server and use xinetd to implement the following access control functions
1. the maximum number of connections to the telnet server is 20.
2. If the number of telnet requests per second reaches 4, the service will automatically stop for 1 minute.
RHCE Internet access-general Linux technology-Linux technology and application information. For details, refer to the following section. What is depressing is that, although it has been two months since Linux was installed, it has been using the Internet access method of China Netcom and ADSL. There is no problem with accessing the Internet in Linux in this way...
Last month, it was transferred to campus network. Huawei's 802.1x certification. Downlo
, then learn more deeply, and do programming development.Another: links can not be accessed, can not watch the video inside YouTube what to do, Baidu keyword: blue light. Need support based on Google Chrome.(It is recommended to use Netpass if the conditions are available.) The quality of my personal experience is more reliable. Can fully play my home 4M small water pipe speed. )Learning is serious, rigorous, extensible, not limited to the so-called curriculum outline, to oneself will be a depth
RHCE (REDHAT7) (ii)The hard disk is in sector,1 sector is 512b (6 and below in cylinder,1 cylinder is about 8M)The partition format for XFS supports up to 500T (6 and below partition formats of Ext4, up to 50T support)Fdisk MBR Partitioning methodGdisk GPT Partitioning methodParted Advanced partitioning operations (create, copy, resize partitions, etc.)Partprobe Refresh partition table (or restart server)Fdisk-lFdisk/dev/sdb (n new,p print,d Delete,w
/rhel6cp-rf/media/*/var/ftp/rhel6/Service VSFTPD StartMkdir/var/lib/tftpboot/pxelinux.cfgCp/ftp/media/isolinux/isolinux.cfg/tftpboot/pxelinux.cfg/defaultVi/tftpboot/pxelinux.cfg/defaultDefault AutoPrompt 1Label AutoKernel VmlinuzAppend initrd=initrd.img devfs=nomount ramdisk_size=8192Label Linux textKernel VmlinuzAppend text initrd=initrd.img devfs=nomount ramdisk_size=8192Label Linux RescueKernel VmlinuzAppend rescue initrd=initrd.img Devfs=nomount ramdisk_size=8192Wq Save4. Prepare the Linux k
RHCE Study Notes 2 -- command line operation File1. Create and delete a file (touch, rm) touch xxxx create a new empty file touch-t 201412250101 xxxx create a file and specify the time attribute (year, month, day, And hour. seconds) [root @ cai home] # touch xxxx [root @ cai home] # touch-t 201412301030 yyyy [root @ cai home] # ls-l xxxx yyyy-rw-r --. 1 root 0 November 2 13:00 xxxx (current time November 2, 2015 02:13)-rw-r --. 1 root 0 December 30 20
The following 30 focuses on the main direction of the rhce examination:
1. Familiar with RedHat Linux installation options, especially network installation
2. Understand Lilo, grub, and other startup management programs and boot Processes
3. Able to install (RPM) and set other installation options afterwards
4. Understand the RedHat Linux System Configuration
5. Familiar with various configuration files under/etc/sysconfig/network-Scripts
6. understa
Article Title: RHCE experiment: xinetd-Based Access Control in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Requirements: configure the telnet server and use xinetd to implement the following access control functions
1. the maximum number of connections to the telnet server is 20.
2. If the number of teln
Logging in bridging mode configuring the Internet 1. Configure the corresponding virtual machine network mode to "Bridging mode"2. View and configure the network card and IP address of this computer (Windows)Example configuration:After configuration, a diagnosis, a restart, you can continue to surf the internet, OK3. Specify the network adapter for the virtual machine4. Configure the virtual machine IPBe aware of the same network segment as the Windows host.5. Restart the virtual machine network
RHCE (REDHAT7)(iii)First, the configuration of soft RAID (MDADM)Mdadm system will be installed automatically, do not need additional installation# mdadm-c/dev/md1-a yes-l1-n2/dev/sdb1/dev/sdb2 ( note 1 is preceded by the letter L,1 represents raid1, 2 for 2 fast drives )View information:# mdadm-d/DEV/MD1generate the configuration file (otherwise, the server restarts the soft RAID is disabled):# Mdadm-ds >/etc/mdadm.conf# MKFS.XFS/DEV/MD1# MOUNT/DEV/M
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