CoreOS Linux is the leading container operating system, designed to be managed and run at massive scale, with minimal operational overhead.
First time I heard about CoreOS I wanted to install on my Virtualbox to test . Testing is my way to learn . You may have AWS or Digital Ocen account to create and install CoreOS via ready snapshots but I prefer to install it in my Virtualbox on my laptop . So I start searching about CoreOS and I find a lot of detailed installation documents that wanted you to know about other topics such as etcd , fleet , etc . But no . I just want to install as simplest as I can to try . CoreOS has its own way of installation .
It is not like other distributions to boot from the os installation media and partitioning and next - next to install . here we need to write a script ( cloud-config.yaml ) In this file we will describe the hostname , what is the username and ssh key for login , etc . For a basic setup we will just set these 4 options . So use your editor and create cloud-config.yaml with the following content . Here we specify the hostname . username to login to our system . This username should be in suders and docker groups so that we can run docker later . and the ssh authorized keys so that we can connect password less .
#cloud-config
hostname: node001
users:
- name: omid
groups:
- sudo
- docker
ssh_authorized_keys:
- ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQDHvxiNz2qJJFFwtPYhWaKjdE7k+Pcmzshvd3Qahp4ekG150FbUqDjJo4j53s4bmNTWthx43ICvYjDdVtHpU1zYOqIA+GvI1FFpFIgq6mb1g39eJcubakbgZbFGEk0JQCmWMt6g6vBk8S2mb97jjNGyOyDpLcJa8gxh54Dn9jDoVQ== Omid@Omids
The cloud-config file uses the YAML file format, which uses whitespace and new-lines to delimit lists, associative arrays, and values. CoreOS website has a useful syntax checker you can use . https://coreos.com/validate/ to validate the config file. https://coreos.com/validate/ So What is the next step ? How can I install the CoreOS with this file ? We need to boot from a Linux Distro and run the config YAML . So why not using the CoreOS itself . Download ISO file from CoreOS website https://coreos.com/os/docs/latest/booting-with-iso.html and Load to virtual box . Set the Virtual box networking to Bridge network . Because We need to copy cloud-config.YAML into our booted CoreOS. After booting with coreOS iso scp the cloud config file .
scp omid@192.168.1.100:/Users/Omid/cloud-config.yaml .
and install the core os on local disk /dev/sda/ with our cloud-config.yaml file .
sudo coreos-install -c cloud-config.yaml -d /dev/sda/That's it . It will download . partition and install the CoreOS .
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