DevOps CLI

A suite of cli tools for DevOps

See config for an introduction to configuration and example for typical configuration.

Install

Homebrew

brew install denfren/tap/devops-cli

from source

cargo install devops-cli

dssh

dssh spawns ssh sessions by querying for EC2 instances. It can also be used to invoke arbitrary commands using information from the instances.

Basic usage

dssh [--profile <profile>] [<query>...] query EC2 instances and spawn ssh session

• query limits the instance selection. When only one instance matches the command executes immediately

Query words can have three forms

• i-... will only be matched against the aws instance id
• numeric values will only match on the end of the name - intended for clustered instances
• anything else will text match on the instance name

Given three instances

• www_server-fra-i-122222-01
• sql_db_server-dus-i-133333-01
• sql_db_server-dus-i-144444-02

Then running...

• dssh ww immediately connects to the www_server (single result)
• dssh db shows a list of the db servers to pick one to connect to (multiple results)
• dssh db 2 finds the instance whose name contains both db and the cluster instance is 2, despite the first instance having a literal 2 in its name (single result)
• dssh i-13 connects to sql db 01, because its instance id starts with i-13

dssh configuration

• AWS specific environment variables, like AWS_PROFILE
• DSSH_LOG (default: "warn"): configure log level
• DSSH_TEMPLATE_DISPLAY (string): template to use to display instances in the selection dialog. Supports Jinja2 templating with instance data
• DSSH_TEMPLATE_COMMAND (json, a list of strings): command template to execute for single instance selections. Defaults to "ssh", "{{ private_ip }}", example: ["ssh", "admin@{{ private_dns }}", "-p", "2222"]
• DSSH_TEMPLATE_MULTICOMMAND (json, a list of strings): command template to execute when multiple instances are selected. Defaults to the value of the DSSH_TEMPLATE_COMMAND
• DSSH_TUNNELBLICK_CONNECTION: A name of a tunnelblick connection to check if it is connected.

Templates

Fields available in the template context (instance details)

• id
• state
• availability_zone
• private_ip
• private_dns
• public_ip
• public_dns
• launch_time
• tags.

dvpn

dvpn, dvpn --profile <profile> connects to the VPN. dvpn -d, dvpn --disconnect disconnects all VPNs.

dvpn configuration

• DVPN_LOG (default: "warn"): configure log level
• DVPN_TUNNELBLICK_CONNECTION: the name of the connection in tunnelblick

Config

The cli commands are configured using environment variables. To simplify configuration, values can be specified in env files at the following locations:

1. $XDG_CONFIG_HOME/dcli/*.env
2. $HOME/.dcli/*.env

When running commands, a "profile" can be specified using -p/--profile <profile-name>. This affects which env files are loaded. In the order listed below, values are loaded:

1. Values that are already set in the environment take precedence
2. if a profile is specified on the command line, <profile>.env is loaded. Otherwise default.env is loaded.
3. then <tool-name>.env is loaded and can be used to provide tool-specific configuration used across all profiles.
4. finally, global.env can be used to configure across all profiles and all tools.

Value types

Values that are the empty are considered to be unset. This allows overriding values to remove a setting.

• string values are used as is
• boolean can be specified using the following values:
  • "yes", "true", "1", "on", "enable", "enabled"
  • "no", "false", "0", "off", "disable", "disabled"
• json values are used for more complex configuration, such as lists or maps

Example

Typical configuration

$HOME/.dcli/staging.env and $HOME/.dcli/prod.env

AWS_PROFILE=my-role-name
DVPN_TUNNELBLICK_CONFIG=my-tunnelblick-config-name

Use staging by default

Simply symlink default.env to staging.env:

ln -s $HOME/.dcli/staging.env $HOME/.dcli/default.env

Let dssh check VPN configured for dvpn

use global.env to let DSSH use DVPN's value by default:

DSSH_TUNNELBLICK_CONNECTION=${DVPN_TUNNELBLICK_CONNECTION}