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Download CentOS 6 – vmware image for free. CentOS 6 x86_64 – preinstalled 64bit version of CentOS 6, ready to use on VMware Player. Download VMware Tools. VMware Tools is a set of services and modules that enable several features in VMware products for better management of, and seamless.
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It requires knowledge of queuing disciplines and the syntax to configure a This represents the purest form of Hadoop available. Canned CentOS 6. No junk! Just pure Apache. VM is 64 bit native build. More informations You can find on virtual-machine.
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The installation software requires more memory than the running CentOS server. You will see another box titled Media Check. In Media Check use the Space bar to select Test. The result must be Success or else your ISO file is corrupt and needs to be removed and downloaded again.
You will see another Media Check box asking you about testing additional media. On the CentOS 6 page, the mouse is working again. Use it or Space to select the Next button. You should see a What language page. On the What language page use the default English selection. You may be tempted to chose your own non-English language, but if you do so your Instructor will not be able to help you with any problems.
Always use the default English language. Select Next. On the Select the appropriate keyboard page use the default U. English keyboard. On the What type of devices page use the default Basic Storage Devices. On the Storage Device Warning page select Yes, discard any data. If you are re-installing your system, you will instead see here an At least one existing installation page that asks you to either overwrite or upgrade your existing installation.
Choose appropriately. On the The root account page enter twice a root account password that you can remember. Keep it simple — this is a low-security student course machine and not a high-security bank! On the Which type of installation page select Create Custom Layout. We are going to use a simple two-partition system instead of the default and more complex Logical Volume Manager layout. After confirming the above two partitions and sizes, on the Please Select A Device page click on Next. On the Format Warnings page click Format.
On the Writing storage configuration to disk page click Write changes to disk. It should say Installation starting. You should see a progress bar saying Packages completed as exactly CentOS packages are installed into the system. If the number is not exactly , you are using the wrong ISO image. The package installation should take less than five minutes.
Some Linux kernel shutdown messages will print on the console, then the virtual machine will reboot. The system should reboot into a black login screen with the banner CentOS release 6. The machine name in front of the login: prompt should be your own Blackboard userid, not abcd Run the following installation verification commands. Your CentOS installation must pass all of the following verification steps:. Run: hostname and verify that it prints your eight-character Blackboard userid as the machine name.
It should look almost exactly like the following, except your machine name and Disk identifier number will differ:.
Run: rpm -q -a wc -l and verify that you have exactly packages installed. You may need to delete this virtual machine and re-install if any of the above numbers or verification steps are wrong. Networking is not enabled on this server yet. It is a good idea to configure your system a bit before enabling networking, so we will enable networking later, after doing some configuration.
A snapshot of a running not fully shut down system is quick to resume if you ever need to go back to it, but a running snapshot has some potentially serious problems:. Snapshots take more space if you take them when the machine is running, since the snapshot has to save all the system memory. Snapshots are smaller if you take them of a system that is powered off. Often you need to restore a snapshot and also make some VM Settings changes.
If you snapshot a running system, then you have to shut it down every time you restore it when you want to make VM Settings changes. Better to create the snapshot of the powered-off system. A snapshot of a running system can only safely be resumed restarted on the system that created it, or a system running a similar CPU type.
You cannot safely back-up the running snapshot files onto a different CPU type and resume it there. A snapshot of a running system may be useless if you try to restart it on a different computer, such as might happen if your laptop computer fails and you need to borrow another.
When possible, make your important snapshots of virtual machines that are actually powered off. You can make intermediate snapshots of running machines just before you make an important change, but you should consider deleting these temporary snapshots after you confirm that the change was successful.
Since CentOS Linux and Ubuntu Linux are different distributions, from different vendors, they sometimes have different documentation and programs.
This configuration section assumes you are starting your configuration from the Fresh Minimal Installation snapshot from the previous section.
Before you begin, you need to understand some terms. These next few points are not action items; they are for your information; there is nothing you need to type yet. Make note of these things:. When it says back up a file below, it means copy the file, preserving time and owner information, into the same directory with a. Boot power on your Fresh Minimal Installation snapshot from the previous section.
Make the configuration changes below to your Fresh Minimal Installation virtual machine. Review the above points A. Networking is not yet enabled on boot. We will enable it now, so that you can connect to your CentOS system using a proper SSH connection instead of using the limited VMware system console:. Sample output for the above commands is given below — your hostname and CentOS local IP addresses write it down will differ:.
You will need it later. We will enable a similar banner for our CentOS virtual system, so that we know to which machine we are connecting:. You might delete the Kernel line and replace it with something of your own, e. Hello Linux People! The VMware console that we have been using has very limited functionality. Instead of using this console to work on the machine, we will do what most system administrators do and connect to the machine using a terminal program of our choice and the standard SSH protocol.
CentOS already has the SSH programs installed and running that enable us to do this; we verified that in the previous section where we set the login banner. Sometimes the networking set-up on your host operating system does not permit you to connect to the network addresses of your virtual machines.
You may have a firewall setting that blocks access. I recommend using the SSH connection for all sysadmin work including the rest of this document. Do not use the crappy VMware console. Save and exit your editors that are running over SSH before you suspend. Use the yum install command to fetch information about the man package, and then we will install it:.
Servers often need to email status messages to humans. We need to use the yum install command to fetch and install an email client program package named mailx :. After installation, make sure that mail -V upper case! The mailx package installs some symbolic links so that the command mail actually runs the mailx program:. Also man mail gives you the same man page as man mailx again using more symlinks :. Your CentOS Minimal Installation comes with a minimal they call it Small version of the vim text editor named vi that is missing many features and help files:.
We want the full version, with help files and tutorials. As root , download and install the full they call it Huge version of vim as follows:. After successful download and installation, start the newly-installed full version of VIM by typing vim not vi and note that this is the Huge version:. CentOS has provided the root account with some personal shell aliases that change the behaviour of some important commands and this is a bad idea.
Type alias and you will see some aliases similar to these:. The aliases for ls and which are harmless, but the options added in the aliases for cp , mv , and rm change the behaviour of these commands significantly.
What do those options do? RTFM for each command. On real servers, the root account is often shared among several sysadmin, and so you must be very careful what aliases you define in the root account. Commands must work exactly as expected, not the way aliases might change them to work.
We will remove these dangerous aliases from our root account:. Use the diff command to compare the back-up file with the new file and make sure only a few lines have changed.
Keep your own personal aliases in your own account and source them when you need them as root. Do NOT put many of your personal aliases into the root account itself. Log out of your VM and then log back in. Type alias and make sure all the dangerous aliases are gone. Keep the aliases in the root account to the bare minimum. Shell command line history for is important to a sysadmin. Although the shell is saving its history upon exit, the history from different shells is not being merged, so history can be lost if you run more than one shell, e.
Also, history is not being saved until a shell exits, which means you can also lose history if a shell is killed prematurely. We could fix these history issues just for the root user, using the root. Instead we are going to make changes to the system-wide bash shell initialization so that all users on the system receive these benefits, not just root.
Make sure you see no output and no errors! Log out. Log back in. Verify that the same history variables have been changed, and that your history file is being updated after every command you type. Use the diff command to compare the back-up file with the new file and make sure only the intended lines have changed. Your machine name must be the same name as your Blackboard userid. The system time is not being synchronized with the Internet.
We need to use the yum install command to fetch and install the Network Time Protocol NTP package named ntp with its time daemon named ntpd :. Run: chkconfig –list ntpd and note the spelling of the service name ntpd.
You will see one line indicating that the ntpd time daemon is turned off in every Run Level. Run: chkconfig –list ntpd again note the spelling of ntpd. You will see one line indicating that the ntpd time daemon is now turned on in Run Levels 2 through Run: service ntpd start and you should see one line saying Starting ntpd: [OK].
If you see errors, fix them and run service ntpd restart to restart ntpd. If all goes well, ntpd starting up will have reset your system clock to the correct time. Run the date command and see. If nothing happened, try waiting 5—10 minutes and see if the time updates. You can perform the other edits below while you wait for this to happen. Continue reading:. Sometimes, installing the VMware Tools package can mitigate this problem; more on that later.
Even with ntpd running, the system may take minutes to re-synchronize its time after a VM Pause, Suspend, or reboot. Earlier versions of CentOS were faster at time synchronization.
Servers in the real world are not paused, suspended, or rebooted as often as at school. VMware Tools will be installed in a separate document, later. Security Enabled Linux is turned on, which can cause many problems for novice Linux users. On a real server, we would leave it enabled. You will learn SELinux configuration in later Linux courses. The screen covers up many useful system messages at boot time. As a sysadmin, you want to see all the boot messages. Make a temporary snapshot of your VM now, in case you make a mistake in the following edit.
If you damage lines in this GRUB configuration file, your machine may not boot at all. You will know if your edits are accurate at the next reboot, coming up in the next section. If the reboot fails, restore back to your temporary snapshot and try the edit again. Having made all the above configuration changes, your CentOS configuration must pass all of the following verification steps after you reboot it:. After the boot, when the machine is up and running, log in on the console again or, better, use an ssh or PuTTY connection to the CentOS local IP address and log in as the user root so you can run some verification commands.
Check that the commands you just typed, above, are appearing at the bottom end of the root BASH history file and that the history environment variables set in the root. The status must be 1 indicating failure — SELinux should not be enabled. Try again. Run: pgrep -l ntpd and verify that the output is one line a process number and the word ntpd. Run: ip route and verify that you have a default via route listed for dev eth0. This default is your gateway IP address.
It will probably be the same IP as the gateway IP. Confirm that you can ping your own machine name with zero packet loss and that your host name resolves to the IP loopback address Make sure the full Huge version of VIM is installed: vim –version. Consult with your instructor if any of the above verification steps fail. Sometimes you can recover a missed configuration step without starting over from scratch.
These Tools instructions below are for VMware users. Make a temporary snapshot of your VM now, in case you make a mistake in the following installation.
If you mis-install the VMware tools, un-installing it may be difficult. Follow this link to Install VMware Tools and confirm that the installation worked. If you have problems or make mistakes, restore back to the temporary snapshot and try again. This personal account can be customized for you, including your own aliases and shell options things you should not set in the root account. Do not add extensive customization to the root account on a system, since such customization may not suit all root users of the system and may break automated programs that need to become the root user.
Remember that a character used in your shell prompt indicates whether or not the current shell is running as the root user. For an interactive root shell, your shell prompt includes the character that indicates root privileges. It also can create a HOME directory for the account and places standard start-up files into it.
An account cannot be used until a password has been set. Recall that man pages often list options with both GNU long-form syntax using double dashes, e. The long-form syntax is easier to understand, but the short-form syntax is easier to type. Use whichever syntax you prefer. If you mis-install the new account, un-installing it may be difficult.
Sample output for the above commands is given below — your hostname and account name should be your userid:. Logging in to a machine as root is not recommended. Many servers actually disable direct login by the root user; you have to log in as the sysadmin user and then use su or sudo to run root commands. You can already use the su account to become the root user, using the root password. We will now enable our sysadmin account to use the sudo command by enabling the wheel group and adding our account to that group.
Your sysadmin account can now run any privileged commands as the root user using sudo. The system has been installed mostly from the original distribution CD, so it needs to have updates downloaded and installed from the Internet. If the list of updates installed includes the linux kernel package, you should safely shut down and reboot the system using: shutdown -r now to install the new kernel.
This is only necessary if you updated the linux kernel package. The system updates may mean that you now have one or two more than the original installed packages. To avoid all the resume problems mentioned earlier, you may want to shut down your machine before taking a major snapshot.
The next sections explain some important things to know about your new virtual server. All network and SSH connections will be disconnected when you Pause the machine. Save your work before you Pause. The current state of the machine, including all the system memory, is saved to disk and then the VM is stopped. Most times you will want to suspend your Virtual Machine so that you can resume it quickly where you left off:. When you resume your Virtual Machine after a Suspend , if you use bridged networking, you may need to refresh the network settings for your new network location by running as root or with sudo : service network restart and your CentOS local IP address may change as a result.
If you need to reconfigure most parts of the VMware Virtual Machine that is running your Linux server, you need to fully shut down the running virtual machine before VMware will let you change the VMware settings. This only works on console terminals, including VMware console terminals, not on remote login sessions.
When you log out of a server console, make sure you check all the alternate consoles and log them out, too! This Appendix is only necessary if you find that the yum installer hangs or does not work. If yum hangs or fails, do these steps until it works:. If you have moved, cloned, or copied your CentOS virtual machine to another system, you may find that networking is not using the eth0 interface but is using eth1 or some other name instead.
Usually the new interface name will be eth1 , but it could be a larger number such as eth2 , etc. In the examples below, we will assume eth1 is the new interface, but you should use the actual number found in the above step. Your job is to delete the old eth0 interface line and change the name of the line with the new MAC address to be eth0 from its current eth1 :.
There are several critical Windows VMware bugs that trigger when installing Linux. Some suggested fixes are listed below. The mobile device requirements for the CST program specify that you must have Intel hardware and run Windows 7 or 8 as a base operating system. Students running other hardware or software are responsible for fixing their own problems. This has been seen on AMD hardware.
See below for possible solutions. When you boot Linux you see lo: Disabled Privacy Extensions followed by a long pause followed by a kernel traceback related to ipv6 networking. Sometimes changing networks moving to a different room or rebooting Windows fixes the problem. When you try to restart your sshd service, it fails. This was seen in Centos 6. You see software virtualization is incompatible with long mode on this platform when you start your VM.
Is this only on AMD hardware? Failing that, these fixes below have worked for some students:. Plain Text – plain text version of this page in Pandoc Markdown format.
Author Ian! Allen – idallen idallen. This is not a Desktop system. The 6. Installing and configuring a server not Desktop CentOS operating system requires significant Linux expertise. You may not initially know the meaning of all the instructions you must follow, below. By the end of the course, you will know what everything means.
Legacy versions of CentOS are no longer supported. For historical purposes, CentOS keeps an archive of older versions. By downloading CentOS software, you acknowledge that you understand all of the following: CentOS software and technical information may be subject to the U.
You may not download CentOS software or technical information if you are located in one of these countries or otherwise subject to these restrictions. You may not provide CentOS software or technical information to individuals or entities located in one of these countries or otherwise subject to these restrictions. You are also responsible for compliance with foreign law requirements applicable to the import, export and use of CentOS software and technical information.
End-of-life Jun 30th, End-of-life May 31st, Cloud Containers Vagrant. Release Notes Release Email Website. ARM64 aarch IBM Power ppc64le. IBM Z sx. End of RHEL9 full support phase.