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https://andrewchilds.github.io/overcast/

Orchestrate VMs from your terminal
https://andrewchilds.github.io/overcast/

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Orchestrate VMs from your terminal

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README 

        
# ![Overcast Logo](http://i.imgur.com/eCBl2NI.png)



Overcast is a tiny command line program designed to make it easy to spin up, configure and manage clusters of machines across multiple cloud providers.



## Devops made simple.



Create, reboot and destroy instances on DigitalOcean or locally using Virtualbox.



```sh

# Spin up a new Ubuntu 20.04 instance on DigitalOcean:

$ overcast digitalocean create db-01



# Perform a full system upgrade and then install Redis:

$ overcast run db-01 install/core install/redis

```



Run multiple commands or multiple scripts on any of your instances over SSH. Commands can be run sequentially or in parallel. Run and test your deployment scripts across different providers.



```sh

# Create a LAMP stack using bundled install scripts:

$ overcast run lamp-01 install/core install/apache install/mysql install/php



# Run your own scripts using relative or absolute paths:

$ overcast run app-cluster ./my-app/my-install-script /path/to/another-script



# Run sequences of commands and scripts across multiple machines in parallel:

$ overcast run app-* ./script.sh uptime "free -m" "df -h" --parallel

```



Quickly SSH in to any instance by name.



```sh

$ overcast ssh app-01

```



Push and pull files between your local machine and any of your instances.



```sh

$ overcast push app-01 nginx/myapp.conf /etc/nginx/sites-enabled/myapp.conf

$ overcast pull app-01 /var/log/syslog ./my-local-syslog-copy

```



Overcast is a thin layer on top of your SSH client. It doesn't install or leave anything on the servers you communicate with, so Overcast itself has no real attack surface.



A library of [scripts](https://github.com/andrewchilds/overcast/tree/master/scripts) and [recipes](https://github.com/andrewchilds/overcast/tree/master/recipes) are bundled to make it easy to deploy a number of common software stacks and applications.



## Installation (OS X/Linux)



1. Install [Node.js](https://github.com/joyent/node/wiki/Installing-Node.js-via-package-manager) if not already installed.



2. Install Overcast using npm.



    ```sh

    $ npm -g install overcast

    ```



3. You can now use Overcast from any directory. Running any overcast command from anywhere will create the `~/.overcast` config directory if it doesn't already exist. Add your API keys to `~/.overcast/variables.json` to use their respective commands, either manually or using the `var` command:



    ```sh

    $ overcast var set DIGITALOCEAN_API_TOKEN abc123

    ```



4. To make working with Overcast easier, you can add bash tab completion by adding the following to your `.bash_profile`:



    ```sh

    # Overcast Tab completion

    _overcast_completions() {

      local cur=${COMP_WORDS[COMP_CWORD]}

      COMPREPLY=($(compgen -W "`overcast completions`" -- "$cur"))

      return 0

    }

    complete -F _overcast_completions overcast

    ```



## Installation (Windows)



Using Overcast on Windows is possible, but **unsupported**.



## Uninstallation



Since Overcast is just a wrapper around SSH, there is nothing on your remote machines to uninstall. To uninstall Overcast from your local machine:



```sh

# To remove the Overcast package:

$ npm -g remove overcast

# Optionally delete your Overcast SSH keys and configuration files:

$ rm -rf ~/.overcast

```



## Configuration



Overcast looks for an `.overcast` directory in the current directory, a parent directory, or `~/.overcast`, in that order. This means you can have multiple configurations and treat your server infrastructure like source code.



The command `overcast init` will create a new configuration in the current directory. The config directory looks like this:



```sh

/.overcast

  /keys             # SSH keys, can be your own or auto-generated by overcast

    overcast.key

    overcast.key.pub

  clusters.json     # Cluster/instance definitions (see example.clusters.json)

  variables.json    # API keys, etc (see example.variables.json)

```



## Design Goals



There are many server management frameworks out there already, but they generally involve a complex server-client implementation, a steep learning curve, or a giant, monolithic conceptual framework that requires taking a course to understand.



I wanted something that had little to no learning curve, that did only what you asked it to do on the remote machines and nothing more, that just focused on multi-server provisioning and communication and leaves problems like process/state management and system monitoring to tools designed specifically for those problems.



## Example App Recipes



  - [Discourse](https://github.com/andrewchilds/overcast/blob/master/recipes/discourse)

  - [Ubuntu 14.04 LAMP server](https://github.com/andrewchilds/overcast/blob/master/recipes/lamp-server)

  - [Overcast Charts](https://github.com/andrewchilds/overcast-charts)



## Command Reference



### overcast aliases



```

Usage:

  overcast aliases



Description:

  Return a list of bash aliases for SSHing to your instances.



  To use, add this to your .bash_profile:

    test -f $HOME/.overcast_aliases && source $HOME/.overcast_aliases



  And then create the .overcast_aliases file:

    overcast aliases > $HOME/.overcast_aliases



  Or to automatically refresh aliases in every new terminal window

  (which will add a couple hundred milliseconds to your startup time),

  add this to your .bash_profile:

    overcast aliases > $HOME/.overcast_aliases

    source $HOME/.overcast_aliases

```



### overcast cluster count



```

Usage:

  overcast cluster count [name]



Description:

  Return the number of instances in a cluster.



Examples:

  $ overcast cluster count db

  > 0

  $ overcast instance create db.01 --cluster db

  > ...

  $ overcast cluster count db

  > 1

```



### overcast cluster add



```

Usage:

  overcast cluster add [name]



Description:

  Adds a new cluster.



Examples:

  $ overcast cluster add db

```



### overcast cluster rename



```

Usage:

  overcast cluster rename [name] [new-name]



Description:

  Renames a cluster.



Examples:

  $ overcast cluster rename app-cluster app-cluster-renamed

```



### overcast cluster remove



```

Usage:

  overcast cluster remove [name]



Description:

  Removes a cluster from the index. If the cluster has any instances

  attached to it, they will be moved to an "orphaned" cluster.



Examples:

  $ overcast cluster remove db

```



### overcast completions



```

Usage:

  overcast completions



Description:

  Return an array of commands, cluster names, and instance names for use

  in bash tab completion.



  To enable tab completion in bash, add this to your .bash_profile:



  _overcast_completions() {

    local cur=${COMP_WORDS[COMP_CWORD]}

    COMPREPLY=($(compgen -W "`overcast completions`" -- "$cur"))

    return 0

  }

  complete -F _overcast_completions overcast

```



### overcast digitalocean boot



```

Usage:

  overcast digitalocean boot [name]



Description:

  Boot up an instance if powered off, otherwise do nothing.

```



### overcast digitalocean create



```

Usage:

  overcast digitalocean create [name] [options...]



Description:

  Creates a new instance on DigitalOcean.



Options:                  Defaults:

  --cluster CLUSTER       default

  --ssh-port PORT         22

  --ssh-key PATH          overcast.key

  --ssh-pub-key PATH      overcast.key.pub

  --region REGION

  --image IMAGE

  --size SIZE

  --backups               false

  --monitoring            false

  --private-networking    false

  --vpc-uuid

  --with-droplet-agent    false



Examples:

  # Match using slugs:

  $ overcast digitalocean create vm-01 --size 2gb --region sfo1



  # Match using IDs or names:

  $ overcast digitalocean create vm-02 --region "London 1" --image 6374128

```



### overcast digitalocean destroy



```

Usage:

  overcast digitalocean destroy [name] [options...]



Description:

  Destroys a DigitalOcean droplet and removes it from your account.

  Using --force overrides the confirm dialog.



Options:     Defaults:

  --force    false



Examples:

  $ overcast digitalocean destroy vm-01

```



### overcast digitalocean images



```

Usage:

  overcast digitalocean images



Description:

  List all images, including snapshots.

```



### overcast digitalocean instances



```

Usage:

  overcast digitalocean instances



Description:

  List all instances in your account.

```



### overcast digitalocean reboot



```

Usage:

  overcast digitalocean reboot [name]



Description:

  Reboot an instance using the provider API.

```



### overcast digitalocean regions



```

Usage:

  overcast digitalocean regions



Description:

  List all available regions.

```



### overcast digitalocean rebuild



```

Usage:

  overcast digitalocean rebuild [name] [image]



Description:

  Rebuilds an existing instance on DigitalOcean, preserving the IP address.

  [image] can be image ID, name or slug.



Examples:

  # Rebuild an instance using a readymade image:

  $ overcast digitalocean rebuild vm-01 ubuntu-14-04-x64



  # Rebuild an instance using a snapshot:

  $ overcast digitalocean rebuild vm-01 "vm-01 backup"

```



### overcast digitalocean resize



```

Usage:

  overcast digitalocean resize [name] [size] [options...]



Description:

  Shutdown, resize, and reboot a DigitalOcean instance.

  [size] must be a valid size slug.

  If the --skip-boot flag is used, the instance will stay powered off.



Options:         Defaults:

  --skip-boot    false



Examples:

  # Resize an instance to 2gb:

  $ overcast digitalocean resize vm-01 2gb

```



### overcast digitalocean snapshot



```

Usage:

  overcast digitalocean snapshot [name] [snapshot-name]



Description:

  Creates a named snapshot of a droplet. This will reboot the instance.



Examples:

  $ overcast digitalocean snapshot vm-01 vm-01-snapshot

```



### overcast digitalocean snapshots



```

Usage:

  overcast digitalocean snapshots



Description:

  List all available snapshots in your account.

```



### overcast digitalocean shutdown



```

Usage:

  overcast digitalocean shutdown [name]



Description:

  Shut down an instance using the provider API.

```



### overcast digitalocean sizes



```

Usage:

  overcast digitalocean sizes



Description:

  List all available instance sizes.

```



### overcast digitalocean sync



```

Usage:

  overcast digitalocean sync [name]



Description:

  Fetch and update instance metadata.

```



### overcast expose



```

Usage:

  overcast expose [instance|cluster|all] [port...] [options]



Description:

  Reset the exposed ports on the instance or cluster using iptables.

  This will fail if you don't include the current SSH port.

  Specifying --allowlist will restrict all ports to the specified address(es).

  These can be individual IPs or CIDR ranges, such as "192.168.0.0/24".



  Expects an Ubuntu server, untested on other distributions.



Options:

  --user USERNAME

  --password PASSWORD

  --allowlist "IP|RANGE"

  --allowlist-PORT "IP|RANGE"



Examples:

  Allow SSH, HTTP and HTTPS connections from anywhere:

  $ overcast expose app 22 80 443



  Allow SSH from anywhere, only allow Redis connections from 1.2.3.4:

  $ overcast expose redis 22 6379 --allowlist-6379 "1.2.3.4"



  Only allow SSH and MySQL connections from 1.2.3.4 or from 5.6.7.xxx:

  $ overcast expose mysql 22 3306 --allowlist "1.2.3.4 5.6.7.0/24"

```



### overcast exposed



```

Usage:

  overcast exposed [instance|cluster|all]



Description:

  List the exposed ports on the instance or cluster.

  Expects an Ubuntu server, untested on other distributions.



Options:

  --user USERNAME

  --password PASSWORD

  --machine-readable, --mr

```



### overcast help



```

Usage:

  overcast help



Description:

  Provides help about Overcast and specific commands.

```



### overcast info



```

Usage:

  overcast info

  overcast info [name]



Description:

  Prints the complete .overcast/clusters.json file.

  Optionally display only instances matching [name].

```



### overcast init



```

Usage:

  overcast init



Description:

  Create an .overcast config directory in the current working directory.

  No action taken if one already exists.

```



### overcast instance get



```

Usage:

  overcast instance get [instance|cluster|all] [attr...] [options...]



Description:

  Returns the attribute(s) for the instance or cluster, one per line,

  or space-delimited using the --single-line option.

  Deeply nested arrays and objects are supported.

  "origin" is a compound attribute that returns user@ip:ssh-port.



Options:               Defaults:

  --single-line, -s    false



Examples:

  $ overcast instance get app-01 origin

  [email protected]:22



  $ overcast instance get app-cluster ip

  127.0.0.1

  127.0.0.2

  127.0.0.3



  $ overcast instance get app-01 digitalocean.image.id

  103510828

```



### overcast instance add



```

Usage:

  overcast instance add [name] [ip] [options...]



Description:

  Adds an existing instance to a cluster.



Options:                 Defaults:

  --cluster CLUSTER      default

  --ssh-port PORT        22

  --ssh-key PATH         overcast.key

  --user USERNAME        root

  --password PASSWORD



Examples:

  $ overcast instance add app.01 127.0.0.1 --cluster app \

      --ssh-port 22222 --ssh-key $HOME/.ssh/id_rsa

```



### overcast instance list



```

Usage:

  overcast instance list [cluster...]



Description:

  Returns all instance names, one per line.

  Optionally limit to one or more clusters.



Examples:

  $ overcast instance list

  $ overcast instance list app-cluster db-cluster

```



### overcast instance remove



```

Usage:

  overcast instance remove [name]



Description:

  Removes an instance from the index.

  The server itself is not affected by this action.



Examples:

  $ overcast instance remove app-01

```



### overcast instance update



```

Usage:

  overcast instance update [instance|cluster|all] [options...]



Description:

  Update any instance property. Specifying --cluster will move the instance

  to that cluster. Specifying --name will rename the instance.



Options:

  --name NAME

  --cluster CLUSTER

  --ip IP

  --ssh-port PORT

  --ssh-key PATH

  --user USERNAME

  --password PASSWORD



Examples:

  # Update the user and ssh-key of an instance:

  $ overcast instance update app.01 --user myuser --ssh-key /path/to/key



  # Update ssh-port of a cluster:

  $ overcast instance update app-cluster --ssh-port 22222

```



### overcast list



```

Usage:

  overcast list



Description:

  List your cluster and instance definitions.

```



### overcast ping



```

Usage:

  overcast ping [instance|cluster|all] [options]



Description:

  Display the average ping time for an instance or cluster.



Options:             Defaults:

  --count N, -c N    3



Examples:

  $ overcast ping app-01

  $ overcast ping db --count 5

```



### overcast port



```

Usage:

  overcast port [instance|cluster|all] [port]



Description:

  Change the SSH port for an instance or a cluster. This command fails

  if the new port has not been previously opened by iptables.

  See also the "expose" and "exposed" commands.



Examples:

  # Expose only necessary ports:

  $ overcast expose vm-01 22 55522 80 443



  # Update SSH port from 22 to 55522:

  $ overcast port vm-01 55522



  # Close port 22:

  $ overcast expose vm-01 55522 80 443

```



### overcast pull



```

Usage:

  overcast pull [instance|cluster|all] [source] [dest] [options...]



Description:

  Pull a file or directory from an instance or cluster using scp by default,

  or using rsync if the --rsync flag is used. Source is absolute or relative

  to the home directory. Destination can be absolute or relative to the

  .overcast/files directory. Any reference to {instance} in the destination

  will be replaced with the instance name.



Options:                 Defaults:

  --rsync                false

  --user USERNAME

  --password PASSWORD



Examples:

  Assuming instances "app.01" and "app.02", this will expand to:

    - .overcast/files/app.01.bashrc

    - .overcast/files/app.02.bashrc

  $ overcast pull app .bashrc {instance}.bashrc

```



### overcast push



```

Usage:

  overcast push [instance|cluster|all] [source] [dest] [options...]



Description:

  Push a file or directory to an instance or cluster using scp by default,

  or rsync if the --rsync flag is used. Source can be absolute or relative

  to the .overcast/files directory. Destination can be absolute or relative

  to the home directory. Any reference to {instance} in the source will be

  replaced with the instance name. The --exclude flag only works with rsync.



Options:                         Defaults:

  --rsync                        false

  --user USERNAME

  --password PASSWORD

  --exclude FILE_OR_DIRECTORY



Examples:

  Assuming instances "app.01" and "app.02", this will expand to:

    - .overcast/files/app.01.bashrc

    - .overcast/files/app.02.bashrc

  $ overcast push app {instance}.bashrc .bashrc

```



### overcast run



```

Usage:

  overcast run [instance|cluster|all] [command|file...]



Description:

  Execute commands or script files on an instance or cluster over SSH.

  Commands will execute sequentially unless the --parallel flag is used.

  An error will stop execution unless the --continueOnError flag is used.

  Script files can be either absolute or relative path.



Options:                         Defaults:

  --env "KEY=VAL KEY='1 2 3'"

  --user USERNAME

  --password PASSWORD

  --ssh-key PATH

  --ssh-args ARGS

  --continueOnError              false

  --machine-readable, --mr       false

  --parallel, -p                 false

  --shell-command "COMMAND"      bash -s

  --only-once                    false



Examples:

  # Run arbirary commands and files in sequence across all instances:

  $ overcast run all uptime "free -m" "df -h" /path/to/my/script



  # Setting environment variables:

  $ overcast run app --env "foo='bar bar' testing=123" env



  # Use machine-readable output (no server prefix):

  $ overcast run app-01 uptime --mr



  # Run bundled and custom scripts in sequence:

  $ overcast run db-* install/core install/redis ./my/install/script



  # Pass along arbitrary SSH arguments, for example to force a pseudo-tty:

  $ overcast run all /my/install/script --ssh-args "-tt"

```



### overcast scriptvar



```

Usage:

  overcast scriptvar [instance|cluster|all] [filename] [key] [value]



Description:

  Set a named variable in a remote file on an instance or cluster.

  Expects a shell variable format, for example MY_VAR_NAME="my_value"



Options:                      Defaults:

  --user USERNAME

  --password PASSWORD

  --continueOnError           false

  --machine-readable, --mr    false

  --parallel, -p              false



Examples:

  $ overcast scriptvar app-01 /path/to/file.sh MY_API_TOKEN abc123

```



### overcast slack



```

Usage:

  overcast slack [message] [options...]



Description:

  Sends a message to a Slack channel.

  Requires a SLACK_WEBHOOK_URL property to be set in variables.json.

  You can set that with the following command:

  overcast var set SLACK_WEBHOOK_URL https://foo.slack.com/blah



Options:                Defaults:

  --channel NAME        #alerts

  --icon-emoji EMOJI    :cloud:

  --icon-url URL

  --user NAME           Overcast

  --KEY VALUE



Examples:

  $ overcast slack "Deploy completed." --icon-emoji ":satelite:"

  $ overcast slack "Server stats" --channel "#general" --cpu "0.54 0.14 0.09"

```



### overcast ssh



```

Usage:

  overcast ssh [instance] [options...]



Description:

  Opens an interactive SSH connection to an instance.



Options:

  --user USERNAME

  --password PASSWORD

  --ssh-key PATH



Examples:

  $ overcast ssh instance-01

  # To use a personal username and key in variables.json:

  $ overcast vars set OVERCAST_SSH_USER my-username

  $ overcast vars set OVERCAST_SSH_KEY /path/to/my.key

  $ overcast ssh instance-01 # will use the above variables to attempt a connection

```



### overcast sshkey create



```

Usage:

  overcast sshkey create [name]



Description:

  Creates a new SSH key in the current .overcast config.



Examples:

  $ overcast sshkey create myKeyName

  New SSH key "myKeyName" created.

   - /path/to/.overcast/keys/myKeyName.key

   - /path/to/.overcast/keys/myKeyName.key.pub

```



### overcast sshkey delete



```

Usage:

  overcast sshkey delete [name]



Description:

  Deletes SSH public/private key files from the current .overcast config.



Examples:

  $ overcast sshkey delete myKeyName

  SSH key "myKeyName" deleted.

```



### overcast sshkey get



```

Usage:

  overcast sshkey get [name] [option]



Description:

  Display the requested SSH key data or path from the current .overcast config.

  Defaults to displaying the public key data if no option found.



Options:

  --public-data

  --private-data

  --public-path

  --private-path



Examples:

  $ overcast sshkey get myKeyName

  [public key data]

  $ overcast sshkey get myKeyName --private-data

  [private key data]

```



### overcast sshkey list



```

Usage:

  overcast sshkey list



Description:

  List the found SSH key names in the current .overcast config.



Examples:

  $ overcast sshkey list

  myKeyName

  overcast

```



### overcast sshkey push



```

Usage:

  overcast sshkey push [instance|cluster|all] [name|path] [options...]



Description:

  Push a public SSH key to an instance or cluster. Accepts a key name,

  filename, or full path. This will overwrite the existing authorized_keys

  file, unless you use --append.



Options:             Defaults:

  --user USERNAME

  --append, -a       false



Examples:

  # Generate new SSH key pair:

  $ overcast sshkey create newKey



  # Push public key to instance, update instance config to use private key:

  $ overcast sshkey push vm-01 newKey

  $ overcast instance update vm-01 --ssh-key newKey.key



  # Same as above but using key path instead of key name:

  $ overcast sshkey push vm-02 "~/.ssh/id_rsa.pub"

  $ overcast instance update vm-02 --ssh-key "~/.ssh/id_rsa"



  # Push public key to instance using arbitrary user:

  $ overcast sshkey push vm-03 newKey --user myOtherUser



  # Append public key to authorized_keys instead of overwriting:

  $ overcast sshkey push vm-04 newKey --append

```



### overcast tunnel



```

Usage:

  overcast tunnel [instance] [local-port((:hostname):remote-port)...]



Description:

  Opens an SSH tunnel to the port(s) specified.

  If only one port is specified, assume the same port for local/remote.

  If no remote host is specified, assume the remote host itself (127.0.0.1).

  Multiple tunnels can be opened over a single connection.



Options:

  --user USERNAME

  --password PASSWORD

  --ssh-key PATH



Examples:

  # Tunnel local 5984 to remote 5984

  $ overcast tunnel app-01 5984



  # Tunnel local 8000 to remote 5984, local 8001 to remote 3000

  $ overcast tunnel app-01 8000:5984 8001:3000



  # Tunnel local 3000 to otherhost.com:4000

  $ overcast tunnel app-01 3000:otherhost.com:4000

```



### overcast vars list



```

Usage:

  overcast vars list



Description:

  List all variables in your current config.

```



### overcast vars set



```

Usage:

  overcast vars set [name] [value]



Description:

  Set a variable in your current config.



Examples:

  $ overcast vars set AWS_KEY myawskey12345

  $ overcast vars set MY_CUSTOM_VARIABLE_NAME foo

```



### overcast vars get



```

Usage:

  overcast vars get [name]



Description:

  Get a variable from your current config.



Examples:

  $ overcast vars get AWS_KEY

  > myawskey12345



  $ overcast vars get MY_CUSTOM_VARIABLE_NAME

  > foo

```



### overcast vars delete



```

Usage:

  overcast vars delete [name]



Description:

  Delete a variable from your current config.



Examples:

  $ overcast vars delete MY_CUSTOM_VARIABLE_NAME

```



### overcast virtualbox boot



```

Usage:

  overcast virtualbox boot [name]



Description:

  Boot up a Virtualbox instance.

```



### overcast virtualbox create



```

Usage:

  overcast virtualbox create [name] [options...]



Description:

  Creates a new Virtualbox instance.



Options:                Defaults:

  --cluster CLUSTER     default

  --cpus COUNT          1

  --image NAME          trusty64

  --ram MB              512

  --ip ADDRESS          192.168.22.10

  --ssh-key PATH        overcast.key

  --ssh-pub-key PATH    overcast.key.pub



Examples:

  $ overcast virtualbox create vm-01

  $ overcast virtualbox create vm-02 --ram 1024 --image precise64

```



### overcast virtualbox destroy



```

Usage:

  overcast virtualbox destroy [name] [options...]



Description:

  Destroys a Virtualbox instance.

  Using --force overrides the confirm dialog.



Options:     Defaults:

  --force    false



Examples:

  $ overcast virtualbox destroy vm-01

```



### overcast virtualbox reboot



```

Usage:

  overcast virtualbox reboot [name]



Description:

  Reboots a Virtualbox instance.

```



### overcast virtualbox shutdown



```

Usage:

  overcast virtualbox shutdown [name]



Description:

  Shut down a Virtualbox instance.

```



### overcast wait



```

Usage:

  overcast wait [seconds]



Description:

  Show a progress bar for a specified number of seconds.



Examples:

  $ overcast wait 30

```



## Running the Tests



[![Build Status](https://travis-ci.org/andrewchilds/overcast.svg?branch=master)](https://travis-ci.org/andrewchilds/overcast)



```sh

npm test

```



## Upgrading Overcast



```sh

npm -g update overcast

```



Configuration files are left alone during an upgrade.



## Contributing



Contributions are welcome. If you've got an idea for a feature or found a bug, please [open an issue](https://github.com/andrewchilds/overcast/issues). If you're a developer and want to help improve Overcast, [open a pull request](https://github.com/andrewchilds/overcast/pulls) with your changes.



### Hacking Overcast



```sh

git clone [email protected]:andrewchilds/overcast.git

cd overcast



# To use local development version:

node overcast [args...]



# To use published version:

overcast [args...]

```



## Roadmap



- Standardize Recipes

- Tagging

- Google Compute Engine support

- More comprehensive script/recipe library

- More test coverage



## License



MIT. Copyright © 2014-2022 Andrew Childs