Kong ➕ Vagrant

Vagrant is used to create an isolated environment for Kong including PostgreSQL, Cassandra, and Redis.

You can use the vagrant box either as an all-in-one Kong installation for testing purposes, or you can link it up with source code and start developing on Kong or on custom plugins.

Table of contents

• Try Kong
• Development environment
  • Preparing the development environment
  • Running Kong from the source repo
  • Testing Kong and custom plugins
  • Log files
  • Development tips and tricks
  • Utilities and profiling
• Environment variables and configuration
  • Exposed ports
• Known issues
• Enterprise support

WINDOWS USERS: Please check the known issues

IMPORTANT: The Kong admin api is by default only available on localhost, but to be able to access it from the host system, the Vagrant box will listen on all interfaces by default. This might be a security risk in your environment.

Try Kong

If you just want to give Kong a test ride, and you have Vagrant installed, then you can simply clone this vagrant repo, and build the VM.

# clone this repository
$ git clone https://github.com/Kong/kong-vagrant
$ cd kong-vagrant

# build the machine
$ vagrant up

# start Kong, by ssh into the vm
$ vagrant ssh
$ kong migrations bootstrap
# if you are running Kong < 0.15.0, run this instead:
# $ kong start --run-migrations
$ kong start

# alternatively use ssh -c option to start Kong
$ vagrant ssh -c "kong migrations bootstrap && kong start"
# or with Kong < 0.15.0:
# $ vagrant ssh -c "kong start --run-migrations"

Kong is now started and is available on the exposed ports.

To verify Kong is running successfully, execute the following command (from the host machine):

$ curl http://localhost:8001

You should receive a JSON response:

{
  "tagline": "Welcome to kong",
  "version": "x.x.x",
  "hostname": "bionic64",
  "lua_version": "LuaJIT 2.1.0-beta3",
  "plugins": {
    "enabled_in_cluster": {},
    "available_on_server": [
      ...
    ]
  }
}

See the environment variables section below for defaults used and how to modify the settings of the Vagrant machine.

When done you can destroy the virtual machine again:

# delete the virtual machine
$ vagrant destroy

Development environment

Preparing the development environment

Once you have Vagrant installed, follow these steps to set up a development environment for both Kong itself as well as for custom plugins. It will install the development dependencies like the busted test framework.

# clone this repository
$ git clone https://github.com/Kong/kong-vagrant
$ cd kong-vagrant

# clone the Kong repo (inside the vagrant one)
$ git clone https://github.com/Kong/kong

# only if you want to develop a custom plugin, also clone the plugin template
$ git clone https://github.com/Kong/kong-plugin

# build a box with a folder synced to your local Kong and plugin sources
$ vagrant up

# ssh into the Vagrant machine, and setup the dev environment
$ vagrant ssh
$ cd /kong
$ make dev

# only if you want to run the custom plugin, tell Kong to load it
$ export KONG_PLUGINS=bundled,myplugin
# if you are running Kong < 0.14.0, run this instead:
# $ export KONG_CUSTOM_PLUGINS=myplugin

# startup kong: while inside '/kong' call `kong` from the repo as `bin/kong`!
# we will also need to ensure that migrations are up to date
$ cd /kong
$ bin/kong migrations bootstrap
# if you are running Kong < 0.15.0, run this instead of bootstrap:
# $ bin/kong migrations up
$ bin/kong start

This will tell Vagrant to mount your local Kong repository under the guest's /kong folder, and (if you cloned it) the 'kong-plugin' repository under the guest's /kong-plugin folder.

To verify Kong has loaded the plugin successfully, execute the following command from the host machine:

$ curl http://localhost:8001

In the response you get, the plugins list should now contain an entry "myplugin" to indicate the plugin was loaded.

To start using the plugin, execute from the host:

# create an api that simply echoes the request using mockbin, using a
# 'catch-all' setup with the `uris` field set to '/'
# NOTE: for pre-0.10 versions 'uris=' below should be 'request_path='
$ curl -i -X POST \
  --url http://localhost:8001/services/ \
  --data 'name=mockbin' \
  --data 'url=http://mockbin.org/request'

$ curl -i -X POST \
  --url http://localhost:8001/services/mockbin/routes \
  --data 'paths[]=/'

# add the custom plugin, to our new api
$ curl -i -X POST \
  --url http://localhost:8001/services/mockbin/plugins \
  --data 'name=myplugin'

If you are using an older version of Kong follow the instructions below instead:

# create an api that simply echoes the request using mockbin, using a
# 'catch-all' setup with the `uris` field set to '/'
# NOTE: for pre-0.10 versions 'uris=' below should be 'request_path='
$ curl -i -X POST \
  --url http://localhost:8001/apis/ \
  --data 'name=mockbin' \
  --data 'upstream_url=http://mockbin.org/request' \
  --data 'uris=/'

# add the custom plugin, to our new api
$ curl -i -X POST \
  --url http://localhost:8001/apis/mockbin/plugins \
  --data 'name=myplugin'

Check whether it is working by making a request from the host:

$ curl -i http://localhost:8000

The response you get should be an echo (by Mockbin) of the request. But in the response headers the plugin has now inserted a header Bye-World.

Running Kong from the source repo

Because the start and stop scripts are in the repository, you must use those to stop and start Kong. Using the scripts that came with the base version you specified when building the Vagrant box will lead to unpredictable results.

# ssh into the Vagrant machine
$ vagrant ssh

# only if you want to run the custom plugin, tell Kong to load it
$ export KONG_PLUGINS=bundled,myplugin
# if you are running Kong < 0.14.0, run this instead:
# $ export KONG_CUSTOM_PLUGINS=myplugin

# startup kong: while inside '/kong' call `kong` from the repo as `bin/kong`!
$ cd /kong
$ bin/kong migrations bootstrap
# if you are running Kong < 0.15.0, run this instead of bootstrap:
# $ bin/kong migrations up
$ bin/kong start

Testing Kong and custom plugins

To use the test helpers from the Kong repo, you must first setup the development environment as mentioned above.

To run test suites, you should first stop Kong, and clear any environment variables you've set to prevent them from interfering with the tests.

The test environment has the same limitation as running from source in that it must be executed from the Kong source repo at /kong, inside the Vagrant machine.

# ssh into the Vagrant machine
$ vagrant ssh

# enter the repo and start the linter
$ cd /kong
$ make lint

# testing: while inside '/kong' call `busted` from the repo as `bin/busted`!
$ bin/busted

# or for more verbose output do
$ bin/busted -v -o gtest

Note that Kong comes with a special Busted script that runs against the OpenResty environment, instead of regular Busted which runs against Lua(JIT) directly.

To test the plugin specific tests:

# ssh into the Vagrant machine
$ vagrant ssh

# start the linter from the plugin repository
$ cd /kong-plugin
$ luacheck .

# testing: while inside '/kong' call `busted` from the repo as `bin/busted`,
# but specify the plugin testsuite to be executed
$ cd /kong
$ bin/busted /kong-plugin/spec

Log files

To log stuff for debugging during your tests, you need to realize that there are generally 2 processes running when testing:

1. Test files executed by busted that run your tests
2. The Kong instance that your tests are running against.

So to debug you can simply use the print function. In the former case the output will be in your terminal from where you executed the tests. In the latter case the output will be in the error.log file, but this file is cleaned automatically in between tests. Because the Kong tests run in the servroot prefix inside the Kong repo you can track them using a tail command.

Inside the virtual machine, the Kong prefix (working directory) will be set to /kong/servroot. You can track the log files (from the host) like this for example:

vagrant ssh -c "tail -F /kong/servroot/logs/error.log"

If you have the Kong source tree available, then /kong will be mounted from the host and the prefix will be on the host in <kong-repo>/servroot (the same location where the tests will also run). In this case you can track the log files directly on the host like this for example:

tail -F <kong-repo>/servroot/logs/error.log"

Development tips and tricks

• Add export KONG_LOG_LEVEL=debug to your bash profile on the host so it will be automatically set whenever you rebuild the VM (applies to other environment variables as well)

• To run individual tests use the --tags switch in busted. Define a test with a tag;

  it("will test something #only", function()
    -- test here
  end

  Then execute the test with bin/busted --tags=only

• Some snippets for debug statements on Kong nation.

• The VM will have some additional helpful utilities installed:

  • httpie
  • jq

Utilities and profiling

Vagrant can build the box with a set of additional utilities if requested:

• Profiling tools (see tools pages for usage details):
  • systemtap
  • stapxx
  • openresty-systemtap-toolkit

To enable those tools use KONG_UTILITIES=true when building the VM.

Environment variables and configuration

The following environment variables will be copied from the Host system into the virtual machine upon provisioning:

You can alter the behavior of the provision step by setting the following environment variables:

Use them when provisioning, e.g.:

$ KONG_VERSION=0.12.1 vagrant up

The xxx_PATH variables will take the value set, or the defaults, but the defaults will only be taken if they actually exist. As such the defaults allow for 2 file structures, without any configuration.

Structure where everything resides inside the kong-vagrant repo:

-some_dir
  |-kong-vagrant
     |-kong
     |-kong-plugin

or if you prefer all repos on the same level:

-some_dir
  |-kong-vagrant
  |-kong
  |-kong-plugin

Exposed ports

The (non-configurable) exposed ports are;

• 8000 HTTP Proxy port
• 8443 HTTPS Proxy port
• 8001 Admin API
• 8444 SSL Admin API
• 9000 TCP Proxy port (both TLS and non-TLS) (only available with Kong >= 0.15.0)
• 65432 Postgres datastore

These are mapped 1-on-1 between the host and guest.

Known issues

Postgres connection refused

When you get an error that postgres refused the connection, eg.

Error: [postgres error] could not retrieve server_version: connection refused

Then make sure that Postgres was properly started, check it like this:

# ssh into the vm
$ vagrant ssh

$ service --status-all

If it wasn't started, you can do so by executing:

# ssh into the vm
$ vagrant ssh

$ sudo service postgresql start

Windows

When using the Vagrant box on Windows there are some extra items to watch out for:

1. you cannot run the Vagrant-box inside another VM, so you have to run it on the Windows host.
2. in combination with the source repositories you might run into issues due to text file incompatibilities. Windows line endings are not supported in unix shell scripts. Use the fix-windows makefile target to fix this.

# ssh into the vm
$ vagrant ssh
$ cd /kong
$ make fix-windows

Incompatible versions error

When Kong starts it can give errors for incompatible versions. This happens for example when dependencies have been updated. Eg. 0.9.2 required Openresty 1.9.15.1, whilst 0.9.5 requires 1.11.2.1.

So please reprovision it and specify the proper version you want to work with (either newer or older, see the defaults above), as in the example below with version 0.9.2;

# clone this repository
$ git clone https://github.com/Kong/kong-vagrant
$ cd kong-vagrant/

# clone the Kong repo and switch explicitly to the 0.9.2 version.
# this will get the proper Kong source code for the version.
$ git clone https://github.com/Kong/kong
$ cd kong
$ git checkout 0.9.2
$ cd ..

# start a box with a folder synced to your local Kong clone, and
# specifically targetting 0.9.2, to get the required binary versions
$ KONG_VERSION=0.9.2 vagrant up

worker_connections are not enough error

When running tests these errors occasionally happen. The underlying reason seems to be that in the VM the connections are not freed up quickly enough. There seem to be 2 workarounds;

• add more memory to the VM. Recreate the vm with:

KONG_VB_MEM=4096 vagrant up

• run the tests by explicitly raising the connection limit, by prefixing the resty executable and the new limit -c 65000, for example:

resty -c 65000 bin/busted -v -o gtest

Vagrant error; The box 'ubuntu/bionic64' could not be found

There is a known issue with Vagrant on OS X with an included curl version that fails. See stack overflow for a solution.

Enterprise Support

Support, Demo, Training, API Certifications and Consulting available at https://getkong.org/enterprise.