🕵️‍♂️🍞 Sanity checking containers, vms, and servers
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README.md

Opunit🕵️‍ | dependencies Status

Simple tool for doing sanity checks on vms, and containers and remote servers. Written in pure node.js

Install with npm

npm install -g opunit

screen shot 2018-10-23 at 10 55 00

Using Opunit

Opunit uses a configuration file (opunit.yml) in the /test directory of you project. This is an example opunit.yml file. By running opunit verify in the root directory of your project, opunit runs the checks defined in the configuration file on the environment of your project; this can be a VM, container or even a remote server.

- group:
    description: "Basic checks for startup"
    checks:
      - availability:
          port: 8080
          status: 200
          url: /
          setup:
            cmd: node app.js
            wait_for: Started Application
      - version:
         cmd: mysql --version
         range: ^8.x.x
      - version:
         cmd: node --version
         range: ^10.x.x

In this example opunit will run 3 checks. First one runs the command node app.js and waits for "Started Application", then checks the reponse status for a request to http://{IP}/. The next two checks run --version commands for MySQL and Java inside the environment and compare the actual version with the provided semver range. If all the checks pass, the output of opunit will look like this:

Checks

        availability check
        Setup: node index.js
        Resolved wait_for condition: Stdout matches "Started Application"
        Tearing down
            ✔   [node-app] http://192.168.8.8:8080// expected: 200 actual: 200
        version check
            ✔   mysql --version: 8.0.12 > ^8.x.x => true
        version check
            ✔   node --version: 10.12.0 > ^10.x.x => true

Summary

        100.0% of all checks passed.
        3 passed · 0 failed

More examples of using Opunit can be found in Baker environments of baker-examples repository.

Checks

Opunit has many checks available for common verification tasks. See the documentation below.

contains supports checking contents of the file. This can be useful when there is a template file and you want to check and make sure it is updated with the correct values in the file.

- contains:
     file: /home/jenkins/settings/login.properties
     string: 'username: root'

status = true | false

Expected output format:

contains check
   ✔   [/home/jenkins/settings/login.properties] contains [username: root] status: true

service supports checking the status of a system service (e.g. systemd).

- service:
   name: mysql
   status: active
- service:
   name: shouldntexist
   status: none

status = active | inactive | none

Expected output:

service check
      ✔   [mysql] expected: active actual: active
service check
      ✔   [shouldntexist] expected: none actual: none

reachable determines whether a resource, such as a url, domain, or path is accessible from the instance. This check is good for determining whether dns or firewalls are configured appropriately.

- reachable:
  - google.com
  - nope.com/404.html
  - reallyImportantFile.txt

capability supports checking the environment satisfies that minimum size of memory, CPU cores, and free disk space.

- capability:
    memory: 2000
    cores: 1
    disks:
      - location: /
        size: 10

availability supports running the specified command and waiting for an output, to then send a http request and check if it receives the expected status code.

- availability:
    port: 3000
    status: 200
    url: /
    setup:
        cmd: baker run serve
        wait_for: Started Application

version supports running the provided "--version" command for an application on the environment, and checking if the installed version is in the range of specified semver range.

- version:
    cmd: mysql --version
    range: ^5.x.x

timezone supports checking the timezone settings on the environment.

- timezone: EST

Connectors

Opunit has different connectors to be able to run checks on different kinds of environments. See below for description of each one and how they can be used.

In general, opunit verify command looks like

$ opunit verify [env_address] -c {criteria_path}
  • env_address is used to automatically determine the type of connector for you (this is explains in more details below).
  • criteria_path is path to opunit.yml file. Opunit automatically finds this file if it is in {current working directory}/test/opunit.yml and in this case you don't have to provide -c.

ssh Connector

If env_address matches username@host:port format (ex. ubuntu@127.0.0.1:2222), then opunit will use this connector. When using this connector, you must also provide path to the ssh key:

$ opunit verify root@example.com:2222 --ssh_key ~/.ssh/id_rsa

By default, if port is not provided, opunit assumes the default ssh port (22).

Baker Connector

If you don't specify a env_address, Opunit will try to use Baker connector by default; for example if opunit is run as below and there is a baker.yml file in the directory:

$ opunit verify

Vagrant Connector

If you don't specify a env_address, Opunit will try to use Vagrant connector by default (if it fails to find a Baker env); for example if opunit is run as below and there is a Vagrantfile file in the directory:

$ opunit verify

Also if env_address is provided and there is a running Vagrant VM with name == env_address, Vagrant connector will be used:

$ opunit verify opunit_vagrant

Docker Connector

If there is a running Docker container with the name or id equal to env_address, opunit will try to use this connector.

$ opunit verify opunit_container

Local Connector

If env_address is "local" or "localhost", opunit will use local connector to run the checks on localhost.

$ opunit verify local

Inventory

Opunit also supports using an inventory file to run checks on multiple (types of) environments. Inventory file is a Yaml file which lists environments that you want to check:

---
- docker:
  - name: opunit_container1
  - name: opunit_container2
- vagrant:
  - name: opunit_vagrant
- ssh:
  - target: root@example.com
    private_key: ~/.ssh/id_rsa
  - target: ubuntu@example.com
    private_key: ~/.ssh/id_rsa
- baker:
  - name: hibernate-spring
    target: ~/projects/hibernate-spring
    criteria_path: ~/projects/opunit.yml

Note: If for an environment a criteria_path is specified, that will be the criteria used for that environment, regardless of what is specified in -c or {current working directory}/test/opunit.yml.

You can run Opunit with an inventory file by running:

$ opunit verify -i {path to inventory.yml}

What about inspec?

Inspec is a great tool! However, it requires much more verbose and manual specifications of tests. For example, in inspec, a test is for checking the timezone requires writing something like this:

# timezone should be est  
describe command('date +%Z') do    
  its(:stdout) { should match(/(EST)/) } 
end

In opunit, this is simply expressed as:

- timezone: EST

Installing from Source

If you want to play with opunit's source code, we suggesting installing and running things like this:

git clone https://github.com/ottomatica/opunit
cd opunit
npm install
npm link