![]() Fedora Atomic QCOW2 Image : Fedora-Atomic.This post provides method for automation of Building Atomic host (Creating new trees). ![]() Project Atomic hosts are built from standard RPM packages which have been composed into filesystem trees using rpm-ostree. If you find any bug/idea please open up issues here. SSH again and You will have your own OSTRee. Now SSH to the Atomic host and perform Reboot so that it will reboot in to custom OSTree. To Check the IP Address of the VM running: $ sudo virsh domifaddr atomic-node We will have the credentials as variables/vault later. ![]() If you wish to change it, modify the cloud-init user-data. Note: user-name: atomic-user, password: atomic are the credentials for the instance. Run the main Playbook which will create VM from QCOW2 image, compose OSTree and perform SSH-Setup and Rebase on OSTree: $ ansible-playbook main.yml -ask-sudo-pass Packages: '"vim-enhanced", "git"' # Packages you want to have in your Atomic host.Īdd packages like above separate by comma. Sourcemanifest: fedora-atomic-docker-host.json # The manifest that goes into the actual Base Fedora host(ostree) content. Additional packages you would like to have in your OSTree.Ībs_path: /workspace # The absolute path to the git repo.Ĭustommanifest: customized-atomic-docker-host.json # The manifest that goes into the custom host(ostree) content that we are going to build.Httpserver: 192.168.122.1 # IP Address of HTTP Server If you are using CentOS please modify the variables based on it.īasehost: fedora-atomic/25/x86_64/docker-host # Basehost I am going to use variables applicable for Fedora. $ ansible-playbook setup.yml -ask-sudo-pass After running the playbook you may use ip addr to check the IP Address of your HTTP server. The OSTree is made available via web server at TCP port 35000. The following will install requirements on your system, initializes OSTree and starts HTTP server as daemon service. Download Atomic QCOW2 image: Fedora-Atomic.If you are using Fedora workstation/any other platform, do not forget to install python2-dnf as well. Make sure Ansible is installed on your system.I will use Fedora distribution for the demo, but the same will be applicable for CentOS as well. The requirements remain the same just like the earlier post. If you do not know about Atomic host, please refer to. No need to create VM from the QCOW2 image will shell script anymore, It will be now all-in-one playbook.Add packages to OSTree (It is suggested not to delete any pre-existing packages from the OSTree, that might break your Atomic host).Below are the improvements on this updated post : This post includes Ansible Automation for customizing packages of OSTree and build Atomic Host. But it is not capable of customizing packages for OSTree and build Atomic host based on it. If both RAM and swap go below 5% free, earlyoom sends the SIGKILL signal to the process with the largest oom_score.įor more information, see the earlyoom man page.My earlier post automate-building-your-own-atomic-host describes how to Automate building Atomic Host with Ansible. If both RAM and swap go below 10% free, earlyoom sends the SIGTERM signal to the process with the largest oom_score. The following is the default earlyoom configuration: As a result, the system does not become unresponsive for long periods of time in low-memory situations. ![]() ![]() If free memory falls below a set limit, earlyoom terminates an appropriate process to free up memory. The earlyoom service monitors system memory usage. Nothing can stop you from installing earlyoom on Fedora Server, or any other Linux distributions if you want -)įaster recovery from low-memory situations in Fedora Workstation The earlyoom service is now enabled by default in Fedora Workstation. Since Fedora 32, workstation flavour will by default install enable user-space OOM killer - named -> earlyoom. ![]()
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