Install Kong Gateway on RHEL

The Kong Gateway software is governed by the Kong Software License Agreement. Kong is licensed under an Apache 2.0 license.

Prerequisites

Download and Install

You can install Kong Gateway by downloading an installation package or using our yum repository.

Package

YUM repository

Install Kong Gateway on RHEL from the command line.

  1. Download the Kong package:

    Kong Gateway

    Kong Gateway (OSS)

    1. curl -Lo kong-enterprise-edition-3.4.0.0.rpm $(rpm --eval https://packages.konghq.com/public/gateway-34/rpm/el/%{rhel}/x86_64/kong-enterprise-edition-3.4.0.0.el%{rhel}.x86_64.rpm)
    1. curl -Lo kong-3.4.0.rpm $(rpm --eval https://packages.konghq.com/public/gateway-34/rpm/el/%{rhel}/x86_64/kong-3.4.0.el%{rhel}.x86_64.rpm)

  2. Install the package using yum or rpm.

    If you use the rpm install method, the packages only contain Kong Gateway. They don’t include any dependencies.

    yum

    rpm

    Kong Gateway

    Kong Gateway (OSS)

    1. sudo yum install -y kong-enterprise-edition-3.4.0.0.rpm
    1. sudo yum install -y kong-3.4.0.rpm

    The rpm method is only available for open-source packages. For the kong-enterprise-edition package, use yum.

    1. rpm -iv kong-3.4.0.rpm

    Installing directly using rpm is suitable for Red Hat’s Universal Base Image “minimal” variant. You will need to install Kong’s dependencies separately via microdnf.

Install the YUM repository from the command line.

  1. Download the Kong YUM repository:

    1.  curl -1sLf "https://packages.konghq.com/public/gateway-34/config.rpm.txt?distro=el&codename=$(rpm --eval '%{rhel}')" | sudo tee /etc/yum.repos.d/kong-gateway-34.repo
    2.  sudo yum -q makecache -y --disablerepo='*' --enablerepo='kong-gateway-34'

  2. Install Kong:

    Kong Gateway

    Kong Gateway (OSS)

    1. sudo yum install -y kong-enterprise-edition-3.4.0.0
    1. sudo yum install -y kong-3.4.0

Set up configs

Kong Gateway comes with a default configuration property file that can be found at /etc/kong/kong.conf.default if you installed Kong Gateway with one of the official packages. This configuration file is used for setting Kong Gateway’s configuration properties at startup.

Kong Gateway offers two options for storing the configuration properties for all of Kong Gateway’s configured entities, a database or a yaml declarative configuration file. Before starting Kong Gateway you must update the kong.conf.default configuration property file with a reference to your data store.

To alter the default properties listed in the kong.conf.default file and configure Kong Gateway, make a copy of the file, rename it (for example kong.conf), make your updates, and save it to the same location.

Using a database

First, configure Kong Gateway using the kong.conf configuration file so it can connect to your database. See the data store section of the Configuration Property Reference for all relevant configuration parameters.

The following instructions use PostgreSQL as a database to store Kong configuration.

  1. Provision a database and a user before starting Kong Gateway:

    1.  CREATE USER kong WITH PASSWORD 'super_secret'; CREATE DATABASE kong OWNER kong;

  2. Run one of the following Kong Gateway migrations:

    • In Enterprise environments, we strongly recommend seeding a password for the Super Admin user with the kong migrations command. This allows you to use RBAC (Role Based Access Control) at a later time, if needed. Create an environment variable with the desired Super Admin password and store the password in a safe place:

      1.  KONG_PASSWORD={PASSWORD} kong migrations bootstrap -c {PATH_TO_KONG.CONF_FILE}

      Important: Setting your Kong password (KONG_PASSWORD) using a value containing four ticks (for example, KONG_PASSWORD="a''a'a'a'a") causes a PostgreSQL syntax error on bootstrap. To work around this issue, do not use special characters in your password.

    • If you aren’t using Enterprise, run the following:

      1.  kong migrations bootstrap -c {PATH_TO_KONG.CONF_FILE}

Note: Older versions of PostgreSQL use ident authentication by default, newer versions (PSQL 10+) use scram-sha-256. To allow the kong user to communicate with the database locally, change the authentication method to md5 by modifying the PostgreSQL configuration file.

Using a yaml declarative config file

If you want to store the configuration properties for all of Kong Gateway’s configured entities in a yaml declarative configuration file, also referred to as DB-less mode, you must create a kong.yml file and update the kong.conf configuration file to include the file path to the kong.yml file.

First, the following command will generate a kong.yml declarative configuration file in your current folder:

  1. kong config init

The generated kong.yml file contains instructions for how to configure Kong Gateway using the file.

Second, you must configure Kong Gateway using the kong.conf configuration file so it is aware of your declarative configuration file.

Set the database option to off and the declarative_config option to the path of your kong.yml file as in the following example:

  1. database = off
  2. declarative_config = {PATH_TO_KONG.CONF_FILE}

Start Kong Gateway

Important: When you start Kong Gateway, the NGINX master process runs as root, and the worker processes run as kong by default. If this is not the desired behavior, you can switch the NGINX master process to run on the built-in kong user or to a custom non-root user before starting Kong Gateway.

For more information, see Running Kong as a Non-Root User.

Start Kong Gateway using the following command:

  1. kong start -c {PATH_TO_KONG.CONF_FILE}

Verify install

If everything went well, you should see a message (Kong started) informing you that Kong Gateway is running.

You can also check using the Admin API:

  1. curl -i http://localhost:8001

You should receive a 200 status code.

By default, listens on the following ports:

  • :8000: Port on which listens for incoming HTTP traffic from your clients, and forwards it to your upstream services.
  • :8443: Port on which listens for incoming HTTPS traffic. This port has similar behavior as the :8000 port, except that it expects HTTPS traffic only. This port can be disabled with the kong.confconfiguration file.
  • :8001: Port on which the Admin API used to configure listens.
  • :8444: Port on which the Admin API listens for HTTPS traffic.

Post-install configuration

The following steps are all optional and depend on the choices you want to make for your environment.

Apply Enterprise license

If you have an Enterprise license for Kong Gateway, apply it using one of the methods below, depending on your environment.

With a database

Without a database

Apply the license using the Admin API. The license data must contain straight quotes to be considered valid JSON (' and ", not ’ or “).

POST the contents of the provided license.json license to your Kong Gateway instance:

Note: The following license is only an example. You must use the following format, but provide your own content.

cURL

HTTPie

  1. curl -i -X POST http://localhost:8001/licenses \
  2.   -d payload='{"license":{"payload":{"admin_seats":"1","customer":"Example Company, Inc","dataplanes":"1","license_creation_date":"2017-07-20","license_expiration_date":"2017-07-20","license_key":"00141000017ODj3AAG_a1V41000004wT0OEAU","product_subscription":"Konnect Enterprise","support_plan":"None"},"signature":"6985968131533a967fcc721244a979948b1066967f1e9cd65dbd8eeabe060fc32d894a2945f5e4a03c1cd2198c74e058ac63d28b045c2f1fcec95877bd790e1b","version":"1"}}'
  1. http POST :8001/licenses \
  2.   payload='{"license":{"payload":{"admin_seats":"1","customer":"Example Company, Inc","dataplanes":"1","license_creation_date":"2017-07-20","license_expiration_date":"2017-07-20","license_key":"00141000017ODj3AAG_a1V41000004wT0OEAU","product_subscription":"Konnect Enterprise","support_plan":"None"},"signature":"6985968131533a967fcc721244a979948b1066967f1e9cd65dbd8eeabe060fc32d894a2945f5e4a03c1cd2198c74e058ac63d28b045c2f1fcec95877bd790e1b","version":"1"}}'

Securely copy the license.json file to your home directory on the filesystem where you have installed Kong Gateway:

  1. $ scp license.json <system_username>@<server>:~

Then, copy the license file again, this time to the /etc/kong directory:

  1. $ scp license.json /etc/kong/license.json

Kong Gateway will look for a valid license in this location.

Enable Kong Manager

If you’re running Kong Gateway with a database (either in traditional or hybrid mode), you can enable Kong Gateway’s graphical user interface (GUI), Kong Manager. See the Kong Manager setup guide for more information.

Enable Dev Portal

If you’re running Kong Gateway with a database (either in traditional or hybrid mode), you can enable the Dev Portal

  1. Enable the Dev Portal in the kong.conf file by setting the portal property to on and the portal_gui_host property to the DNS or IP address of the system. For example:

    1.  portal = on
    2.  portal_gui_host = localhost:8003

  2. Restart Kong Gateway for the setting to take effect, using the following command:

    1.  kong restart -c {PATH_TO_KONG.CONF_FILE}

  3. To enable the Dev Portal for a workspace, execute the following command, updating DNSorIP to reflect the IP or valid DNS for the system:

    1. curl -X PATCH http://localhost:8001/workspaces/default \
    2.  --data "config.portal=true"

  4. Access the Dev Portal for the default workspace using the following URL, substituting your own DNS or IP:

    1.  http://localhost:8003/default

Troubleshooting and support

For troubleshooting license issues, see:

Next steps

Check out Kong Gateway’s series of Getting Started guides to get the most out of Kong Gateway.