You can adjust the behavior of sonic and set some handy default values with settings files. The settings files used are determined by the value of environment variable
AWS_PROFILE. The value determines the settings profile to use. There can exist multiple settings files which all get loaded and merged. The options from the files follow the following precedence rules:
- current folder - The current folder’s
.sonic/[AWS_PROFILE].ymlvalues take the highest precedence. The current folder is typically the project folder.
- user - The user’s
~/.sonic/[AWS_PROFILE].ymlvalues take the second highest precedence.
- default - The default settings bundled with the tool takes the lowest precedence.
A concrete example helps explain it. Let’s say
AWS_PROFILE=prod-profile with the following files:
- in current folder:
- in user home folder:
.sonic/prod-profile.yml gets merged into
~/.sonic/prod-profile.yml and that in turn gets merged into sonic’s default settings.
You can also use the
SONIC_PROFILE=prod-profile environment variable instead of the
AWS_PROFILE environment variable. The
SONIC_PROFILE wins over the
Here is an
bastion: # cluster_host mapping host: # default is nil - which means a bastion host wont be used host_key_check: false ssh: user: ec2-user # used with `sonic ecs ssh` command ecs_service_cluster_map: default: default # default cluster hi-web: production hi-clock: production hi-worker: production
The following table covers the different setting options:
|bastion.host||Bastion mapping allows you to set a bastion host on a per ECS cluster basis. The bastion host is used as the jump host. Examples: bastion.mydomain.com, firstname.lastname@example.org or 184.108.40.206.||(no value)|
|bastion.host_key_check||Controls whether or not use the strict host checking ssh option. Since EC2 server host changes often the default value is false.||false|
|ecs_service_cluster_map||Service to cluster mapping. This is a Hash structure that maps the service name to cluster names.||(no value)|
|ssh.user||User to ssh into the server with. This can be overriden at the CLI with the user@host notation but can be set in the settings.yml file also.||ec2-user|
The default settings are located tool source code at lib/sonic/default/settings.yml.
Service to Cluster Mapping
A useful option is the
ecs_service_cluster_map. This option maps ecs service names to cluster names. This saves you from typing the
--cluster option repeatedly. Here is an example
ecs_service_cluster_map: default: my-default-cluster hi-web: production hi-clock: production hi-worker: production
This results in shorter commands:
sonic ecs ssh hi-web sonic ecs ssh hi-clock sonic ecs ssh hi-worker
Instead of what you normally would have to type:
sonic ecs ssh hi-web --cluster production sonic ecs ssh hi-clock --cluster production sonic ecs ssh hi-worker --cluster production
Pro tip: Use the <- and -> arrow keys to move back and forward.