26 Mayıs 2015 Salı

Howto Update Coreos with Update Engine

Get engine options:
update_engine_client -help

Get update status
update_engine_client -status

Force Coreos an immediate update check:
update_engine_client -update

If the update fails you can check the logs of the update engine by running:
journalctl -u update-engine -o cat

If you want to download another update you may need to clear the reboot pending status:

update_engine_client -reset_status

30 Mart 2015 Pazartesi

Getting SSH_AUTH_SOCK environment variable Error for Fleetctl journal command at CoreOS

One way is it to put private key to ssh-agent

Append commands below to .bash_profile

eval  `ssh-agent -s`
ssh-add ~/.ssh/id_rsa

Then fleetctl journal command will run as expected.

Overrride cloud-config parameters installed by coreos-install

If you invested a lot of time to override config param that comes through installation, then carry on reading.

The installation script will process your cloud-config.yaml file specified with the -c flag and place it onto disk. It will be installed to /var/lib/coreos-install/user_data and evaluated on every boot.

For instance,  there is a simple config for coreos-install


    name: node001
    discovery: <discoveriy ip>
    - name: etcd.service
      command: start

There are two way to override config parameter:
  1. Override systemd service by etcd.service.d/override.conf:
  2. Override coreos installation script under /var/lib/coreos-install/user_data

I prefer to edit /var/lib/coreos-install/user_data and run coreos-cloudinit to update configurations.