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LFCE_DesignandDeployment.md

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LFCE: Design and Deployment

  1. Define a capacity planning strategy

  2. Conduct post deployment verifications

  3. Create and maintain software packages

  4. Create, configure and maintain containers

  5. Deploy, configure, and maintain high availability/clustering/replication

Define a capacity planning strategy

Conduct post deployment verifications

Create and maintain software packages

  • To build an rpm file based on the spec file that we just created, we need to use rpmbuild command

    yum install rpm-build rpmdevtools
rpmdev-setuptree
    • wget http://downloads.xiph.org/releases/icecast/icecast-2.3.3.tar.gz -> Download source tar file for the package that you want to build and move it to ..rpmbuild/SOURCES
    • Go to ..rpmbuild/SPECS and execute rpmdev-newspec spec_name.spec to create simple spec file.
    • Edit the spec file and fill all needed.
    • rpmbuild -v -bb ./SPECS/icecast.spec -> Build it

  • Examples:

  • To downgarde the rpm package, use the below command syntax:

    • yum --showduplicates list firefox -> Show old versions.
    • [package-name]-[version].[architecture] -> Structure of the package name.
    • yum install yum-utils -> To install yumdownloader.
    • yumdownloader firefox-91.2.0-4.el7.centos.x86_64 -> To download the old package.
    • yum install firefox-91.2.0-4.el7.centos.x86_64 -> Works only when upgrading.
    • rpm -Uvh --oldpackage [downloaded_lower_version_package] -> Revert to the old version.

Create, configure and maintain containers

  • LXC:

    • acronym for Linux Containers, is a lightweight Linux kernel based virtualization solution, which practically runs on top of the Operating System, allowing you to run multiple isolated distributions the same time.

    • The difference between LXC and KVM virtualization is that LXC doesn’t emulates hardware, but shares the same kernel namespace, similar to chroot applications. This makes LXC a very fast virtualization solution compared to other virtualization solutions, such as KVM, XEN or VMware

    • yum install epel-release && yum install lxc lxc-templates -> Install it.

    • systemctl start lxc; lxc-checkconfig -> Check the kernel for LXC support.

    • ls -l /usr/share/lxc/templates/ -> List available LXC container templates.

    • lxc-create -n container_name -t container_template -> Create LXC container.

      • lxc-create -n mydcb -t centos

    • lxc-ls; lxc-info --name mydcb -> To see the containers. If lxc-ls is not found install it using: yum whatprovides /usr/bin/lxc-ls

    • lxc-start -n mydcb -d -> Start it.

    • lxc-console -n mydcb or lxc-attach -> Connect to it.

    • lxc-stop -n mydcb, lxc-destroy -n mywheez, lxc-clone mydeb mydeb-clone

    • lxc-copy -n bucket2 -N bucket3 -> lxc-copy is the newest command for cloning LXC containers.

    • lxc-create -n debby -t download -- -d debian -r bullseye -a amd64

      • -n = name
      • -t = template
      • -d = distibution
      • -a = arch
      • -r = release

    • echo "lxc.start.auto = 1" >> /var/lib/lxc/autostart_container/config -> Make the container to autostart.

    • And finally, all created containers reside in /var/lib/lxc/ directory. If for some reason you need to manually adjust container settings you must edit the config file from each container directory.

  • Docker:

  • KVM:

Deploy, configure, and maintain high availability/clustering/replication

  • TBD

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