coreos commands

gistfile1.txt

# For more commands: https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units

#### Workflow Example (for Etcd)

# Clear all of the logs (Be very careful running this)
# #sudo journalctl --vacuum-time=1seconds

# Inspect cloudinit.conf
cat /run/systemd/system/etcd2.service.d/20-cloudinit.conf

# Reload systemd if cloudinit changed
sudo systemctl daemon-reload

# Start the service
sudo systemctl start etcd2

# Stop the service
sudo systemctl stop etcd2

# Look at the logs
journalctl -u etcd2 --pager-end

#### Systemctl

# Man page: http://www.dsm.fordham.edu/cgi-bin/man-cgi.pl?topic=systemctl

# This will start the service in the current session
sudo systemctl start service_name.service

# Enable a service to be started at boot time
sudo systemctl enable service_name.service

# To determine the status of a particular service
systemctl status service_name.service -l

# If you merely need to verify that a service is running
systemctl is-active service_name.service

# If you merely need to verify that a service is enabled
systemctl is-enabled service_name.service

# To display a list of all active system services
systemctl list-units --type=service

# Reload systemd, looking for new or changed units
sudo systemctl daemon-reload

# Show the environment variables for a process
systemctl show docker --property Environment

# Edit the systemd files
systemctl edit --full etcd

#### Journalctl

# Man page: http://www.dsm.fordham.edu/cgi-bin/man-cgi.pl?topic=journalctl

# Show logs from current boot
journalctl -b

# View logs from previous boot
journalctl -b -1

# Jump to end of logs for a service
journalctl -u service_name.service --pager-end

# Follow the logs for the update-engine service
journalctl -u update-engine -f

#### CoreOS

# Group used and reboot strategy can be found here
/etc/coreos/update.conf

# Restart the update engine after any changes
systemctl restart update-engine.service

# To force an update
sudo update_engine_client -update

# Release information can be found here
cat /etc/os-release

# Cloud-init (oem-cloudinit.service) can be found here
/run/systemd/system

# Dropin units can be found here
/etc/systemd/system

# Cloud config can be found here
cat /usr/share/oem/cloud-config.yml

# Default systemd unit files
/usr/lib/systemd/system/
/usr/lib64/systemd/system/

## Users

# Generating a password for elroy

SALT=$(openssl rand -base64 16 | tr -d '+=' | head -c 16)
PASSWORD=$(openssl passwd -1 -salt ${SALT} super_secret_password)
echo $PASSWORD | pbcopy