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Basics of Initial CentOS /RHEL 6.x Server Configuration

Basics of Initial CentOS /RHEL 6.x Server Configuration. Warren Myers BGLUG 4 Aug 2014. Create a Server. Digital Ocean Sign in/up (http://bit.ly/ 1ukcuUK) Create Droplet (VM) VirtualBox Create new VM Mount OS ISO Boot and install. First Steps Post Build. Turn off unnecessary services

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Basics of Initial CentOS /RHEL 6.x Server Configuration

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  1. Basics of Initial CentOS/RHEL 6.x Server Configuration Warren Myers BGLUG 4 Aug 2014

  2. Create a Server • Digital Ocean • Sign in/up (http://bit.ly/1ukcuUK) • Create Droplet (VM) • VirtualBox • Create new VM • Mount OS ISO • Boot and install

  3. First Steps Post Build • Turn off unnecessary services • chkconfig --list | grep ‘:on’ • chkconfig <servicename> off • Install any updated packages • yum -y upgrade • Basic sanity on ssh • Create a new user • Give user sudo privileges • visudo • Enable wheel group • Add user to wheel • Disallow password authentication for root

  4. Second Steps Post Build • Add swap (if you didn’t during install) • Do you “need” swap? • Yes! • No! • Maybe! • Partition or swapfile? • As root • dd if=/dev/zero of=/swapfilebs=8096 count=524288 • mkswap /swapfile • swapon /swapfile • Add to /etc/fstab • /swapfile swap swap defaults 0 0

  5. Third Steps Post Build • User management • Configure postfix (or exim or …) • Install apps/services you want/need • Apache/Nginx • PHP • ftp • ftp access should be highly limited • Install helpful utilities • yum -y install screen emacs

  6. What About RHEL/CentOS 7? • Pros • Kernel now on 3.x series • Better virtualization support • Lots of updated packages • Cons • chkconfig doesn’t manage most services • Seemingly-small changes bigger than in previous version upgrades

  7. What About My Favorite Distro? • Ubuntu / Debian / Mint • Configs similar • Uses update-rc.d instead of chkconfig • Mint isn’t a server distro! • Slackware • Many configs similar • No standard tool like chkconfig • SuSE • Configs similar-ish … but more “European” • Also uses chkconfig • Everything else (Arch, *BSD, etc) • <shrug/>

  8. What About Desktops/Workstations?

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