Running a netinstall over HTTP
by Uday R. Sawant, William Leemans, Jonathan Hobson, Oliver Pelz
Linux: Powerful Server Administration
- Linux: Powerful Server Administration
- Table of Contents
- Linux: Powerful Server Administration
- Linux: Powerful Server Administration
- Credits
- Preface
- 1. Module 1
- 1. Managing Users and Groups
- 2. Networking
- Introduction
- Connecting to a network with a static IP
- Installing the DHCP server
- Installing the DNS server
- Hiding behind the proxy with squid
- Being on time with NTP
- Discussing load balancing with HAProxy
- Tuning the TCP stack
- Troubleshooting network connectivity
- Securing remote access with OpenVPN
- Securing a network with uncomplicated firewall
- Securing against brute force attacks
- Discussing Ubuntu security best practices
- 3. Working with Web Servers
- Introduction
- Installing and configuring the Apache web server
- Serving dynamic contents with PHP
- Hosting multiple websites with a virtual domain
- Securing web traffic with HTTPS
- Installing Nginx with PHP_FPM
- Setting Nginx as a reverse proxy
- Load balancing with Nginx
- Setting HTTPs on Nginx
- Benchmarking and performance tuning of Apache
- Securing the web server
- Troubleshooting the web server
- 4. Working with Mail Servers
- 5. Handling Databases
- Introduction
- Installing relational databases with MySQL
- Storing and retrieving data with MySQL
- Importing and exporting bulk data
- Adding users and assigning access rights
- Installing web access for MySQL
- Setting backups
- Optimizing MySQL performance – queries
- Optimizing MySQL performance – configuration
- Creating MySQL replicas for scaling and high availability
- Troubleshooting MySQL
- Installing MongoDB
- Storing and retrieving data with MongoDB
- 6. Network Storage
- 7. Cloud Computing
- 8. Working with Containers
- Introduction
- Installing LXD, the Linux container daemon
- Deploying your first container with LXD
- Managing LXD containers
- Managing LXD containers – advanced options
- Setting resource limits on LXD containers
- Networking with LXD
- Installing Docker
- Starting and managing Docker containers
- Creating images with a Dockerfile
- Understanding Docker volumes
- Deploying WordPress using a Docker network
- Monitoring Docker containers
- Securing Docker containers
- 9. Streaming with Ampache
- 10. Communication Server with XMPP
- 11. Git Hosting
- Introduction
- Installing Git
- Creating a local repository with Git CLI
- Storing file revisions with Git commit
- Synchronizing the repository with a remote server
- Receiving updates with Git pull
- Creating repository clones
- Installing GitLab, your own Git hosting
- Adding users to the GitLab server
- Creating a repository with GitLab
- Automating common tasks with Git hooks
- 12. Collaboration Tools
- 13. Performance Monitoring
- 14. Centralized Authentication Service
- 2. Module 2
- 1. Installing CentOS
- Introduction
- Downloading CentOS and confirming the checksum on Windows or OS X
- Creating USB installation media on Windows or OS X
- Performing an installation of CentOS using the graphical installer
- Running a netinstall over HTTP
- Installing CentOS 7 using a kickstart file
- Getting started and customising the boot loader
- Troubleshooting the system in rescue mode
- Updating the installation and enhancing the minimal install with additional administration and development tools
- 2. Configuring the System
- Introduction
- Navigating text files with less
- Introduction to Vim
- Speaking the right language
- Synchronizing the system clock with NTP and the chrony suite
- Setting your hostname and resolving the network
- Building a static network connection
- Becoming a superuser
- Customizing your system banners and messages
- Priming the kernel
- 3. Managing the System
- Introduction
- Knowing and managing your background services
- Troubleshooting background services
- Tracking system resources with journald
- Configuring journald to make it persistent
- Managing users and their groups
- Scheduling tasks with cron
- Synchronizing files and doing more with rsync
- Maintaining backups and taking snapshots
- Monitoring important server infrastructure
- Taking control with GIT and Subversion
- 4. Managing Packages with YUM
- 5. Administering the Filesystem
- 6. Providing Security
- 7. Building a Network
- 8. Working with FTP
- 9. Working with Domains
- 10. Working with Databases
- 11. Providing Mail Services
- 12. Providing Web Services
- 13. Operating System-Level Virtualization
- 14. Working with SELinux
- 15. Monitoring IT Infrastructure
- 1. Installing CentOS
- 3. Module 3
- 1. Working with KVM Guests
- 2. Deploying RHEL "En Masse"
- 3. Configuring Your Network
- 4. Configuring Your New System
- 5. Using SELinux
- 6. Orchestrating with Ansible
- 7. Puppet Configuration Management
- 8. Yum and Repositories
- 9. Securing RHEL 7
- 10. Monitoring and Performance Tuning
- Bibliography
- Index
In this recipe, we will learn how to initiate the process of running a netinstall over HTTP (using the URL method) in order to install CentOS 7. It is a process in which a small image file is used to boot the computer and let the user select and install only the software packages and services he wants and nothing more over a network connection thus providing great flexibility.
Before we begin, it is assumed that you already know how to download and checksum a CentOS 7 installation image and how to create the relevant installation media from it. For this recipe here, we will need to download and create installation media for the netinstall image (download the latest CentOS-7-x86_64-NetInstall-XXXX.iso file) instead of the minimal ISO shown in another recipe in this chapter. Also, it is assumed that you have at least gone through the graphical installation procedure once to exactly know how to boot from your installation media and work with the installer program.
To begin this recipe, insert your prepared netinstall media, boot your computer from it, and wait for the welcome screen to appear:
- On the welcome splash screen, the option Test this media & install CentOS 7 is preselected and we will use this option. When you are ready, press the Return key to proceed.
- After the tests finish, the graphical installer will load and present the typical graphical installation summary screen.
- Before we can install CentOS over the network, we have to make sure that we have a working network connection. Therefore, you should first click on the Network & Host name menu entry and activate one of your network adapters to the connected state. Refer to the normal installation recipe for more details.
- Next, click on Installation source to enter the settings. As we will be installing over HTTP (also referred to as the URL method), you should leave the default On the network selected in the Which installation source would you like to use? section.
- Now type in the following URL in the standard
http://textfield, which we will use to download all the required installation packages at http://mirror.centos.org/centos/7/os/x86_64/. - Alternatively, you can also use a personal repository which you would have to create in advance (see Chapter 4, Managing Packages with YUM)
- When you are ready, click on Done to start the initialization process.
- On success, the installer will begin to retrieve the appropriate
install.imgfile. This may take several minutes to complete, but once resolved, a progress bar will indicate all the download activity. When this process finishes successfully, the exclamation mark at the installation source will go away but another one will pop up which will tell the user that it is missing the software selection. Click on it and choose whatever fits your need. As for the purpose of this recipe, just select Minimal install under Base environment and then click on Done. - If the Which installation source would you like to use stays greyed out and cannot be changed, then there are connection problems with your network adapter. If this is the case, go back to configure Network & Hostname and change the network settings until the connected state can be reached.
- CentOS 7 will now install the operating system the usual way and will congratulate you when this process finishes. It may be slower than installing from a physical installation media since all the packages have to be retrieved from the Internet.
The purpose of this recipe was to introduce you to the concept of the CentOS network installation process, in order to show you just how simple this approach can be. By completing this recipe you have not only saved time by limiting your initial download to those files that are required by the installation process, but you have also been able to take advantage of the full graphical installation method without the need for a complete DVD suite.
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