GitLab can be configured to interact with Kubernetes, or other systems using the Kubernetes API (such as OpenShift).
Each project can be configured to connect to a different Kubernetes cluster, see the configuration section.
If you have a single cluster that you want to use for all your projects, you can pre-fill the settings page with a default template. To configure the template, see the Services Templates document.
Navigate to the Integrations page of your project and select the Kubernetes service to configure it.
The Kubernetes service takes the following arguments:
- API URL
- Custom CA bundle
- Kubernetes namespace
- Service token
The API URL is the URL that GitLab uses to access the Kubernetes API. Kubernetes
exposes several APIs - we want the "base" URL that is common to all of them,
https://kubernetes.example.com rather than
A namespace is just a logical grouping of resources. This is mostly for ease of management, so you can group things together. For example, if you have 50 projects using the same cluster, providing a simple list of all pods would be really difficult to work with. In that case, you can provide a separate namespace to group things, as well as reduce name collision issues.
GitLab authenticates against Kubernetes using service tokens, which are
scoped to a particular
namespace. If you don't have a service token yet,
you can follow the
to create one. You can also view or create service tokens in the
Kubernetes dashboard - visit
Config ➔ Secrets.
Fill in the service token and namespace according to the values you just got.
If the API is using a self-signed TLS certificate, you'll also need to include
ca.crt contents as the
Custom CA bundle.
The Kubernetes service exposes following deployment variables in the GitLab CI build environment:
KUBE_URL- equal to the API URL
KUBE_NAMESPACE- The Kubernetes namespace is auto-generated if not specified. The default value is
<project_name>-<project_id>. You can overwrite it to use different one if needed, otherwise the
KUBE_NAMESPACEvariable will receive the default value.
KUBE_CA_PEM_FILE- only present if a custom CA bundle was specified. Path to a file containing PEM data.
KUBE_CA_PEM(deprecated)- only if a custom CA bundle was specified. Raw PEM data.
KUBECONFIG- Path to a file containing kubeconfig for this deployment. CA bundle would be embedded if specified.
NOTE: Added in GitLab 8.15. You must be the project owner or have
masterpermissions to use terminals. Support is currently limited to the first container in the first pod of your environment.
When enabled, the Kubernetes service adds web terminal
support to your environments. This is based on the
exec functionality found in
Docker and Kubernetes, so you get a new shell session within your existing
containers. To use this integration, you should deploy to Kubernetes using
the deployment variables above, ensuring any pods you create are labelled with
app=$CI_ENVIRONMENT_SLUG. GitLab will do the rest!