This is a script for preparing CoreOS systems automatically. It features the following:
- It sets up a basic environment, adding various environment files we use, primarily for DNS
- It ensures that you have eth0 and docker0 setup, and ready for use, writing addresses to .env files
- It gets a base hostname and domain from AWS metadata
- It adds ip address info to the hostname so you can tell your cluster members apart
- It prepares a resolv.conf for use after SkyDNS is up and running on the local host.
- It installs fig
- It installs docker-sdlc
- It installs docker-enter
To use it, directly on new CoreOS instances:
\curl -sSL https://raw.githubusercontent.com/guruvan/coreos-init/master/install | sudo bash
Or, use the following unit from your cloudconfig:
- name: install-coreos-init.service
runtime: no
command: start
content: |
[Unit]
Description=Install from github.com/guruvan/coreos-init
After=docker.service flanneld.service
Requires=docker.service flanneld.service
ConditionPathExists=!/tmp/installed.coreos-init
[Service]
User=root
Type=oneshot
RemainAfterExit=yes
TimeoutStartSec=900
ExecStart=/bin/sh -c "curl -ksSL https://raw.githubusercontent.com/guruvan/coreos-init/master/install |/bin/bash -x "
ExecStop=/bin/sh -c "rm /opt/tmp/hostname.set"
Output will be:
Installing fig............ [ OK ] Installing docker-sdlc.... [ OK ] Installing docker-enter... [ OK ] Installing btrfs-swapon... [ OK ] Creating swapfile......... [ OK ]
- If a file already exists the specific installation step is skipped.
- If there is already a
/swapfilethe swap creation step is skipped. - If docker-sdlc is already cloned, it will pull instead of clone.
You'll then be able to see the following:
core@demo ~ $ fig Punctual, lightweight development environments using Docker. Usage: fig [options] [COMMAND] [ARGS...] fig -h|--help Options: --verbose Show more output --version Print version and exit -f, --file FILE Specify an alternate fig file (default: fig.yml) -p, --project-name NAME Specify an alternate project name (default: directory name) Commands: build Build or rebuild services help Get help on a command kill Kill containers logs View output from containers ps List containers rm Remove stopped containers run Run a one-off command scale Set number of containers for a service start Start services stop Stop services up Create and start containers
docker-sdlc is a collection of fig files that compose an SDLC environment.
Docker-enter is a wrapper script that helps to nsenter inside containers. It uses as parameter the container id or name to identify the namespace.
Note: Remember prefix sudo on docker-enter commands as it needs to run as root to get the necessary privileges.
core@demo ~ $ docker run --name jenkins -d -P quay.io/harbur/jenkins fdf7ff06b4f1d44e1558506c70b9a325d4c0595f68637c883b22968968f9c87f
core@demo ~ $ sudo docker-enter jenkins root@fdf7ff06b4f1:~#
core@demo ~ $ swapon -s Filename Type Size Used Priority /dev/loop2 partition 2097148 69420 -1
core@demo ~ $ free -m
total used free shared buffers cached
Mem: 494 487 6 0 0 51
-/+ buffers/cache: 436 58
Swap: 2047 67 1980