Centos 6 Kickstart Post Install Script Download
Red Hat lab with CentOS, Fedora and Libvirt Red Hat certifications are uncompromising. The best preparation is practise and the best place to practise is a virtual lab.
Step By Step Guide To Install CentOS Linux Virtual Machine in Windows Hyper-V Server Question: Please follow this step by step guide to load CentOS 5.x or other Linux. FAI is a non-interactive system to install, customize and manage Linux systems and software configurations on computers as well as virtual machines and chroot. CentOS as a group is a community of open source contributors and users. Typical CentOS users are organisations and individuals that do not need strong commercial. Fix Yum Lock Errors. Symptom: When you attempt to install a package with yum, you get an error saying that "Another app is currently holding the yum lock.".
Step By Step Guide To Install Cent. OS Linux Virtual Machine in Windows Hyper- V Server.
Question. Please follow this step by step guide to load Cent. OS 5. x or other Linux Operating System in Windows Hyper- V server. If yo don't know, please refer to Step by Step Guide to Create Windows Hyper- V Virtual Machine. We created an emulated network adapter to access Interate in order to make installation convenient. Drop down Network: list and select External Virtual Network. Click Apply. Now you have an emulated network adapter to be used to access Internet before enable synthetic network adapter.
On right pane under Media select proper installation media. We used Cent. OS DVD image to install, so select Image file : and Browse to the image file and open.
There would pop up the Virutal Machine Connection Window. On the new VM window, select menu Action - > Start. Now Cent. OS installation start. The emulated network adapter should be recognized and should show up as Figure 5. We would configure it to make installation more convenient. The URL for the time this article is writen is here.
Figure. 6After extract the ISO file, mount it to the new VM's DVD drive (shows in Figure. The easiest way to install those is via Yum. You need to run 'su - '. It will load root user's context completely(Thank you Jos! So let's install via Yum. Let's try again. But you may fail again and get the following. Checking if required components are installed..
This may take a while.. Updated /boot/initrd- 2. Updating grub conf file.. If you get the following, you succeeded.
Congratulations! It's becuase another kernel was install during update. But it's annoying.
To solve it, you could modify Grub configuration file, /boot/grub/grub. You can reboot the server now. During reboot there would be a new network interface named seth. It's the new recognized synthetic network adapter. You can configure it and remove the emulated one.
Red Hat lab with Cent. OS, Fedora and Libvirt. Red Hat lab with Cent. OS, Fedora and Libvirt. Red Hat certifications are uncompromising. The best preparation is practise and the best place to practise is a virtual lab. This is one way to build that lab, with Fedora as the host and Cent.
OS as the guests. This is a monster guide and it'll take you through more than just the basics. The end result will be five virtual machines: server. Free. IPA server (includes DNS, LDAP, Kerberos KDC)router.
The host will have a Squid- based lazy efficient package repository, mirroring only what you use, enabling fast repeat installations with a small foot- print on your host. Libvirt has a snapshot mechanism built- in that you can use to tear down and revert machines. As a bonus I'll throw in a script to command your machines as a pack. What follows is opinionated: it is all command line and expects you to know how work your line.
Tmux and vim, but pick your tools. Versions: Fedora 2. Cent. OS 7. 2. What's the plan? Prepare your host.
Create a second virtual network. Configure a yum repo mirror on the host. Build and configure the first virtual machine - a simple router. Build and configure the rest of the lab. Configure the Free. IPA server. Create a rudimentary lab management script.
Snapshot & party. Prepare your host. Check your processor has active virtualization support: $ egrep '^flags.*(vmx. This is your choice, but typically within /home or /var. Write to a file. Something short and sweet as you'll be repeatably slamming it in.
The only rule is that these must be fully qualified, with hostname. The domain will be significant to Kerberos. This guide will use the names in the table at the start, but you could have some fun, you'll be typing these a lot. Cent. OS version. Find out which RHEL minor- version will be used in your exam, it may not be the latest release and there may be differences.
To list pre- built images available from virt- builder: $ virt- builder - l . Note if you're not using a US keyboard. You're configuring this early as once the network is defined inside libvirt, virtual cards can be easily plugged in as you import disk images. Dump the xml definition of the default network to a file and edit: $ mkdir /home/username/. Amend the highlighted values: < network>.
Example: < network>. Tips: To generate a fresh UUID - - use uuidgen. To generate a fresh MAC address - - use macgen. Use virsh net- define to create the new network in libvirt: $ virsh net- define other. Name State Autostart Persistent.
Yum package repository. This is not absolutely essential: you could re- download from internet mirrors every time you reinstall, but a local mirror will markedly speed up re- installations.
There are choices. You could download a multi- gigabyte Cent.
OS ISO and serve as a repository, as described by Cert. Depot here, but I keep the impact on my local drives to the minimum by using a squid reverse- proxy to only mirror packages downloaded. Matt Wagner wrote a great guide on how to do this and the version here is cribbed from Matt. Check it out as he explains the configuration in detail. Before you start, pick a Cent.
OS repository mirror. Pick one near to you from the Cent. OS Mirror List and use to replace mirror. On your host. su - . Just the changes.
Squid normally listens to port 3. Simple router Time to build the first machine. You're going to use virt- bulder to create the disk images.
There are other options: Kickstart and an ISO for purists or Vagrant for the developer minded, but virt- builder is a fast way to default machines, using pre- built images from a trusted source. I'll talk you through this step- by- step, so you understand the changes. You'll then be able to adjust the templates that follow for the other machines. First, to build the image run virt- builder, replacing the marked values with your intended hostname, username and file locations. VMs can struggle to generate entropy, forcing you to wait.- -noreboot suppresses booting the machine post- install- -noautoconsole suppresses spawning a virt- viewer graphical console Note the slight difference in OS name convention, osinfo- query os for options. Use virsh to start the machine and get the DHCP provisioned IP, then connect via ssh.
The quick way is to use these two sed commands: sed - i '/mirrorlist/ s/^/#/' /etc/yum. Cent. OS- Base. repo. Cent. OS- Base. repo.
Yum repo. Add the yum repo hostname (repo. IP address inside the virtual network to the guests /etc/hosts file. From the point- of- view of machines inside the virtual network, the hosts IP address is the gateway xxx. Libvirt's dnsmasq will hoover up the hosts /etc/hosts each time the network is started, so if you don't change the guest's /etc/hosts file, it'll ask dnsmasq's DNS and be told that repo. Router configuration. Forwarding packets is disabled by default, as this capability could be dangerous if the system was deployed into an open network. For our purposes this is not a concern as the guests are isolated from unsolicited connections by the hosts firewall.
This time taking the quick- route, bundling all the configuration into the virt- builder and virt- install commands. These commands will not run as is, you need to amend for your environment, key sections highlighted. Run each command one- by- one, or save in a file, make executable and run. If you're using vim: : %s/username/actual/g. Notes: -- firstboot- command inserts the network and yum configurations - -noautoconsole suppresses the console typically spawned by virt- install Static routes set in /etc/sysconfig/network- scripts/route- eth.
This may be a topic of a future post when I have tied it down, but for now trust me and set in your /etc/hosts file. Kerberos and LDAP in particular require verbose configuration if installed from the package- up. Installation is super simple. Where there are gaps , hit ENTER to accept the default. Using the form. .
You may add another. Download Recovery Software With Keygen. You must make sure these network ports are open. TCP Ports. * 8. 0, 4.
HTTP/HTTPS. * 3. 89, 6. LDAP/LDAPS. * 8. 8, 4. UDP Ports. * 8. 8, 4. You can now obtain a kerberos ticket using the command: 'kinit admin'.
This ticket will allow you to use the IPA tools (e. The password for these. Directory Manager password. Open the firewall.# firewall- cmd - -permanent - -add- service=. Connect via your browser on the host and have a poke around, but do not make any changes until the machine has been snapshot!
Stop and test Time to check that everything is correct, but crucially, do not install anything extra, the machines have not yet been snapshot and you want pristine defaults. From the host try connecting to each of the machines and try pings across the two networks. This could be a lot of keyboard work, starting, stopping and reverting. To make this nicer I crafted a rudimentary script, which takes a list of machines and issues commands via virsh to every machine. Snapshot & party To create a snapshot named 'baseline' for every machine in your lab: $ lab snapshot tag baseline.
Party time. Start them up.