Official Repository

Last pushed: 15 days ago
Short Description
Open-source Microservice & API Management layer built on top of NGINX.
Full Description

Supported tags and respective Dockerfile links

Quick reference

What is Kong?

Kong is a scalable, open source API Layer (also known as an API Gateway, or API Middleware). Kong was originally built at Mashape to secure, manage and extend over 15,000 Microservices for its API Marketplace, which generates billions of requests per month.

Backed by the battle-tested NGINX with a focus on high performance, Kong was made available as an open-source platform in 2015. Under active development, Kong is now used in production at hundreds of organizations from startups, to large enterprises and government departments including: The New York Times, Expedia, Healthcare.gov, The Guardian, Condè Nast and The University of Auckland.

Kong's documentation can be found at getkong.org/docs.

How to use this image

First, Kong requires a running Cassandra 2.2.x/3.x or PostgreSQL 9.4/9.5 cluster before it starts. You can either use the official Cassandra/PostgreSQL containers, or use your own.

1. Link Kong to either a Cassandra or PostgreSQL container

It's up to you to decide which datastore between Cassandra or PostgreSQL you want to use, since Kong supports both.

Cassandra

Start a Cassandra container by executing:

$ docker run -d --name kong-database \
                -p 9042:9042 \
                cassandra:3

Postgres

Start a PostgreSQL container by executing:

docker run -d --name kong-database \
                -p 5432:5432 \
                -e "POSTGRES_USER=kong" \
                -e "POSTGRES_DB=kong" \
                postgres:9.4

2. Prepare your database

Run the database migrations with an ephemeral Kong container:

docker run --rm \
    --link kong-database:kong-database \
    -e "KONG_DATABASE=postgres" \
    -e "KONG_PG_HOST=kong-database" \
    -e "KONG_CASSANDRA_CONTACT_POINTS=kong-database" \
    kong kong migrations up

In the above example, both Cassandra and PostgreSQL are configured, but you should update the KONG_DATABASE environment variable with either cassandra or postgres.

Note: migrations should never be run concurrently; only one Kong node should be performing migrations at a time.

Start Kong

Once the database has been started and prepared, we can start a Kong container and link it to the database container, and configuring the KONG_DATABASE environment variable with either cassandra or postgres depending on which database you decided to use:

$ docker run -d --name kong \
    --link kong-database:kong-database \
    -e "KONG_DATABASE=cassandra" \
    -e "KONG_CASSANDRA_CONTACT_POINTS=kong-database" \
    -e "KONG_PG_HOST=kong-database" \
    -p 8000:8000 \
    -p 8443:8443 \
    -p 8001:8001 \
    -p 8444:8444 \
    kong

If everything went well, and if you created your container with the default ports, Kong should be listening on your host's 8000 ([Proxy][http://getkong.org/docs/latest/configuration/#proxy_port]), 8443 (Proxy SSL), 8001 (Admin API) and 8444 (Admin API SSL) ports.

You can now read the docs at getkong.org/docs to learn more about Kong.

3. Use Kong with a custom configuration (and a custom Cassandra/PostgreSQL cluster)

You can override any property of the Kong configuration file with environment variables. Just prepend any Kong configuration property with the KONG_ prefix, for example:

$ docker run -d --name kong \
    -e "KONG_LOG_LEVEL=info" \
    -e "KONG_CUSTOM_PLUGINS=helloworld" \
    -e "KONG_PG_HOST=1.1.1.1" \
    -p 8000:8000 \
    -p 8443:8443 \
    -p 8001:8001 \
    -p 7946:7946 \
    -p 7946:7946/udp \
    kong

Reload Kong in a running container

If you change your custom configuration, you can reload Kong (without downtime) by issuing:

$ docker exec -it kong kong reload

This will run the kong reload command in your container.

Image Variants

The kong images come in many flavors, each designed for a specific use case.

kong:<version>

This is the defacto image. If you are unsure about what your needs are, you probably want to use this one. It is designed to be used both as a throw away container (mount your source code and start the container to start your app), as well as the base to build other images off of.

kong:alpine

This image is based on the popular Alpine Linux project, available in the alpine official image. Alpine Linux is much smaller than most distribution base images (~5MB), and thus leads to much slimmer images in general.

This variant is highly recommended when final image size being as small as possible is desired. The main caveat to note is that it does use musl libc instead of glibc and friends, so certain software might run into issues depending on the depth of their libc requirements. However, most software doesn't have an issue with this, so this variant is usually a very safe choice. See this Hacker News comment thread for more discussion of the issues that might arise and some pro/con comparisons of using Alpine-based images.

To minimize image size, it's uncommon for additional related tools (such as git or bash) to be included in Alpine-based images. Using this image as a base, add the things you need in your own Dockerfile (see the alpine image description for examples of how to install packages if you are unfamiliar).

License

View license information for the software contained in this image.

Docker Pull Command

Comments (11)
ccliffportalfinance
19 days ago

If I follow all of your instructions, by cutting and pasting the commands that you have posted, the docker container fails to run.

It hangs, and presents the following message:

prefix directory /usr/local/kong not found, trying to create it

This is the only message that is output to the console.

vittaliy
a month ago

How can I migrate the configuration from the existing standalone Kong instance to the Docker version?

shanshan33
3 months ago

How to start Kong when listening on port 80?
I want to have kong listen on port 80, and I have updated the configuration /usr/local/kong/nginx-kong.conf:
server {
server_name kong;
listen 0.0.0.0:80;
meanwhile, updated the Dockerfile
EXPOSE 80 8443 8001 7946
but failed to deploy on DC/OS with HOST networking.

soufianefadil
7 months ago

How to use JWT please ? i can see only Postgres and Cassandra

xiaoy110
8 months ago

hello would you please tell me why, when i run
[root@node ~]# docker run --name kong \

--link kong-database:kong-database \
-e "KONG_DATABASE=cassandra" \
-e "KONG_CASSANDRA_CONTACT_POINTS=kong-database" \
-e "KONG_PG_HOST=kong-database" \
-p 8000:8000 \
-p 8443:8443 \
-p 8001:8001 \
-p 7946:7946 \
-p 7946:7946/udp \
kong

2017/03/01 07:31:16 [warn] 7#0: 2 [lua] log.lua:22: warn(): No cluster infos in shared dict cassandra, context: ngx.timer
2017/03/01 07:31:16 [error] 7#0:
2 [lua] log.lua:22: err(): Could not set keyspace. [Invalid] Keyspace 'kong' does not exist, context: ngx.timer
Error: /usr/local/share/lua/5.1/kong/cmd/start.lua:18: [cassandra error] [Invalid] unconfigured table schema_keyspaces

Run with --v (verbose) or --vv (debug) for more details

before that,i was run
docker run -d --name kong-database \
-p 9042:9042 \
cassandra

thefosk
a year ago

Yes you are right - I will update the doc with the new ENV variable.

pipoe2h
a year ago

Hi,

Following the previous comment, the argument "KONG_PG_HOST=kong-database" just applies if you're running PostgreSQL as database.

If you want to run Kong with Cassandra you must add the argument "KONG_CASSANDRA_CONTACT_POINTS=kong-database"

Regards,
Jose

pipoe2h
a year ago

Hi,

First at all, my knowledge around docker is limited, so maybe my conclusion doesn't make sense.

The step by step to run Kong didn't work for me. I tried with both databases, Cassandra and PostgreSQL. The kong container always exits with code (0) when you run the step to link with the database container.

The docker-compose approach works fine, no problem at all.

I compared the Dockerfile with the Docker-compose.yml and I found the environment variable "KONG_PG_HOST=kong-database" presents in the Docker-compose.yml wasn't in the Dockerfile.

I run the syntax adding -e "KONG_PG_HOST=kong-database" and it worked fine.

I think you should add the attribute -e "KONG_PG_HOST=kong-database" to the syntax for the option 1, or otherwise add to the Dockerfile the line ENV KONG_PG_HOST kong-database

Regards,
Jose

thefosk
a year ago

@pablofmorales I can run the Docker fine - have you tried the official Compose distribution at https://github.com/Mashape/docker-kong/tree/master/compose ?