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README.md

CollinsShell Description

The collins shell is a lightweight application built on top of the collins_client gem. The collins_client gem provides API access to collins, the collins_shell application provides CLI API access to collins.

Installation

> gem install collins_shell

Setup

Collins shell will look for a yaml file at ~/.collins.yaml, passed in via --config=my_collins.yaml, or passed in via an environment variable like COLLINS=~/my_collins.yaml. The file should look like:

---
host: "http://somehost:8080"
username: "user"
password: "secret"

You can also specify the host, username, or options via the --host, --username and --password options. If you just specify --password (without a value), or your configs are missing a password, you will be prompted for one.

Overview

There are a few common themes found throughout the collins shell that will help you be productive.

Command Structure

collins-shell uses thor under the hood to handle command line dispatching and parsing. Arguments to collins-shell consist of commands, subcommands, arguments, and options.

Supported commands and subcommands are:

asset
    create
    delete
    delete_attribute
    find
    get
    set_attribute
    set_status
console
ip_address
    allocate
    assets
    delete
    delete_all
    find
    pools
    update
ipmi
    create
    pool
    update
latest
log
logs
power
power_status
provision
    host
    list
tag
    list
    values
version

All commands are of the form:

collins-shell <command> <args> <options>

Every command can be described via help, e.g. collins-shell help log or collins-shell asset help create. Note that to get help for a subcommand, the help directive must come after the command, but before the subcommand.

This returns help for the asset find subcommand:

collins-shell asset help find

This returns help for the asset command (the find subcommand is ignored):

collins-shell help asset find

A command is something like log or asset find. Arguments are required options, passed to the command without a switch (e.g. asset get TAG, TAG is an argument there). Options are optional, and generally passed like --option or --option=value.

Universal Options

The following options can be specified for every command:

--config=CONFIG       # YAML configuration file
--debug               # Debug output
--host=HOST           # Collins host (e.g. http://host:port)
--quiet               # Mostly used in conjunction with commands that have an --exec option
--timeout=SECONDS     # Seconds to allow for operation, defaults to 30
--username=USERNAME   # Collins username
--password=PASSWORD   # Collins password

Common Options

Many options will allow you to specify either a selector (matching many assets) or a tag (matching a single asset). A tag is the asset tag, a selector is a space separated list of key:value pairs that are asset keys and values. Some examples are:

# Allocated web servers (note that multiple selectors are separated by a space)
--selector=hostname:'^web.*' status:Allocated
# Allocated master database servers in the main pool
--selector=primary_role:database pool:main secondary_role:master status:Allocated
# Asset with tag 001923
--tag=001923

Note that any time a command will result in changing more than one asset, collins-shell will prompt for confirmation.

Multi-Collins Support

Collins has a feature called 'multi-collins' that allows multiple collins servers to know about each other. This functionality provides a unified view of all assets, regardless of which collins server stores a given asset. If you have enabled multi-collins, your collins-shell configuration only needs to have credentials and host information for one of your collins servers.

By default, collins-shell only interacts a single collins server (the one specified in the configuration file). To run commands against all of your collins servers, pass the --remote option.

One exception to this is asset get. asset get takes --remote=TAG where tag is the asset tag of the datacenter that has the asset, e.g. --remote=ewr01 or --remote=d2.

The following commands support multi-collins:

asset find
asset get (with --remote=DC)
asset set_attribute
asset delete_attribute
asset set_status
log

Because asset find supports multi-collins, for any commands that don't (e.g. power_status, it's trivial to script piping the results of the find to some other command.

Usage

Getting Help

Before using any command, check out the help. You can see help for a command by running:

collins-shell help <command>

or

collins-shell <sub> help <command>

Where <sub> is something like asset, ipmi or ip_address and <command> is something like create, delete or get. For example

> collins-shell asset help get
Usage:
  collins-shell asset get TAG

Options:
  --config=CONFIG      # YAML configuration file
  --debug              # Debug output
  --host=HOST          # Collins host (e.g. http://host:port)
  --password=PASSWORD  # Collins password
  --quiet              # Be quiet when appropriate
  --timeout=N          # Collins client timeout
                       # Default: 30
  --username=USERNAME  # Collins username
  --confirm            # Require exec confirmation. Defaults to true
                       # Default: true
  --exec=EXEC          # Execute a command using the data from this asset. Use {{hostname}}, {{ipmi.password}}, etc for substitution
  --logs               # Also display asset logs
  --remote=REMOTE      # Remote location to search. This is a tag in collins corresponding to the datacenter asset

get an asset and display its attributes

Examples

> collins-shell
Tasks:
  collins-shell asset <command>                         # Asset related commands
  collins-shell console                                 # drop into the interactive collins shell
  collins-shell help [TASK]                             # Describe available tasks or one specific task
  collins-shell ip_address <command>                    # IP address related commands
  collins-shell ipmi <command>                          # IPMI related commands
  collins-shell log MESSAGE                             # log a message on an asset
  collins-shell power ACTION --reason=REASON --tag=TAG  # perform power action (off, on, rebootSoft, rebootHard, etc) on an asset
  collins-shell power_status --tag=TAG                  # check power status on an asset
  collins-shell provision <command>                     # Provisioning related commands
  collins-shell tag <command>                           # Tag related commands
> collins-shell asset
Tasks:
  collins-shell asset create --tag=TAG           # create an asset in collins
  collins-shell asset delete --tag=TAG           # delete an asset in collins (must be cancelled)
  collins-shell asset delete_attribute KEY       # delete an attribute in collins
  collins-shell asset find --selector=key value  # find assets using the specified selector
  collins-shell asset get TAG                    # get an asset and display its attributes
  collins-shell asset help [COMMAND]             # Describe subcommands or one specific subcommand
  collins-shell asset set_attribute KEY VALUE    # set an attribute in collins
  collins-shell asset set_status STATUS          # set status on an asset
> collins-shell asset find --selector=status:Allocated 'hostname:^web.*'
id,tag,status,type,created,updated
18,sl-90918,Allocated,Server Node,2012-02-08T00:34:43+00:00,2012-06-09T00:31:39+00:00
20,sl-111623,Allocated,Server Node,2012-02-08T00:34:44+00:00,2012-06-09T01:25:35+00:00
21,sl-70108,Allocated,Server Node,2012-02-08T00:34:44+00:00,2012-06-09T00:42:16+00:00
23,sl-89121,Allocated,Server Node,2012-02-08T00:34:47+00:00,2012-06-09T00:33:31+00:00

Tips and Tricks

There are a couple of neat features in the collins shell to be aware of.

Detailed asset views

I have tried to make the shell as consistent with the web UI as possible. Try running a command like:

collins-shell asset get VALID_TAG_HERE

The display should be familiar to people if you've logged into the web UI.

Asset Logs

Adding --logs to your asset get or asset find commands will show logs for each asset.

Making find more useful

There are three switches that are useful to know about with the asset find command.

awk format

If you need to do some kind of post processing on data not found in the default find results, you can specify them via the --tags option. This will give you a comma separated list of tags, one for each asset. For example:

collins-shell asset find --selector=hostname:'^web' status:Allocated --tags=hostname addresses

Will provide you a list that might look like:

hostname,addresses
web-7c177b48.d2.tumblr.net,10.80.96.243|10.80.96.1|255.255.248.0,192.172.29.80|192.172.29.65|255.255.255.224
web-a1a316af.d2.tumblr.net,10.80.97.95|10.80.96.1|255.255.248.0,192.172.38.108|192.172.38.97|255.255.255.224

The header line tells you the asset tags you are displaying. Each line has a comma separated list of values. If a value is an array of some sort, values within it are separated by pipes. Easy parsing!

If you would prefer not to display the header line, just add --header=false to your find command.

Note there is one caveat, the current version of collins-shell cannot prompt for authentication data if you are passing output to a pipe. In order to pass output to a pipe, you must have your collins server and credentials defined in ~/.collins.yaml or pass them to collins-shell on the command line.

Detailed output

Try adding --details to your asset find command to get a detailed asset view of each of the assets in the result set.

Size

Setting --size=N (e.g. --size=1000) will give you that number of results or less. The default is 50 results.

Friendly Sizes

If you're querying on the memory_size_total or disk_storage_total, you can use human readable values like 72GB or 2.18298348411918TB. Yeah, the disk one kind of sucks. But, if you do a get or find --details you can see what the correct query value is.

Execute commands using asset data

Some commands support an --exec option that allows you to execute a command using the information associated with the asset. An example might be:

collins-shell asset get TAG \
  --exec='IPMI_PASSWORD={{ipmi.password}} ipmitool -I lanplus -E -U {{ipmi.username}} -H {{ipmi.address}} sol activate'

This will create a console session using IPMI with the asset specified by TAG. Any attributes of an asset can be specified as {{attribute}}, e.g. {{hostname}} or {{addresses.first.address}}.

The Interactive Shell

It is also possible to use collins shell in an interactive mode. You can drop into the collins shell console by doing:

collins-shell console

Be sure to provide your config YAML in the usual way. Once you are in the shell you can get a list of global commands by typing help. Global commands can be used regardless of context. Below is a sample interactive session.

collins / > ls /
....
collins / > cd /PRIMARY_ROLE
collins /PRIMARY_ROLE > ls
collins /PRIMARY_ROLE > cd DEVEL
collins /PRIMARY_ROLE/DEVEL > ls --format='{{hostname}} {{status}} {{tag}}' --grep=blake
collins /PRIMARY_ROLE/DEVEL > cd sl-91016
collins /PRIMARY_ROLE/DEVEL/sl-91016* > ls
collins /PRIMARY_ROLE/DEVEL/sl-91016* > cat -b
collins /PRIMARY_ROLE/DEVEL/sl-91016* > cat /var/log/messages
collins /PRIMARY_ROLE/DEVEL/sl-91016* > cat /var/log/NOTE
collins /PRIMARY_ROLE/DEVEL/sl-91016* > asset.created.to_s
collins /PRIMARY_ROLE/DEVEL/sl-91016* > power?
collins /PRIMARY_ROLE/DEVEL/sl-91016* > reboot!
collins /PRIMARY_ROLE/DEVEL/sl-91016* > cd ../sl-102313
collins /PRIMARY_ROLE/DEVEL/sl-102313* > stat

This is all ruby, so you can play with a lot of this data using ruby as you would expect. Some examples:

collins / > ls /HOSTNAME/.*blake.* | {|array| array.map{|a| [a.tag,a.hostname,a.status]}}
collins / > hosts = _
collins / > hosts.select do |host|
collins / *   host[2] == 'Allocated'
collins / * end.map do |host|  
collins / *   [host[0], host[1], collins_client.with_asset(host[0]).power_status]
collins / * end  

The above checks the power status of the selected hosts.