727 lines
34 KiB
Markdown
727 lines
34 KiB
Markdown
# Adding and removing Kubernetes clusters
|
|
|
|
GitLab offers integrated cluster creation for the following Kubernetes providers:
|
|
|
|
- Google Kubernetes Engine (GKE).
|
|
- Amazon Elastic Kubernetes Service (EKS).
|
|
|
|
GitLab can also integrate with any standard Kubernetes provider, either on-premise or hosted.
|
|
|
|
TIP: **Tip:**
|
|
Every new Google Cloud Platform (GCP) account receives [$300 in credit upon sign up](https://console.cloud.google.com/freetrial),
|
|
and in partnership with Google, GitLab is able to offer an additional $200 for new GCP accounts to get started with GitLab's
|
|
Google Kubernetes Engine Integration. All you have to do is [follow this link](https://cloud.google.com/partners/partnercredit/?pcn_code=0014M00001h35gDQAQ#contact-form) and apply for credit.
|
|
|
|
## Before you begin
|
|
|
|
Before [adding a Kubernetes cluster](#add-new-cluster) using GitLab, you need:
|
|
|
|
- GitLab itself. Either:
|
|
- A GitLab.com [account](https://about.gitlab.com/pricing/#gitlab-com).
|
|
- A [self-managed installation](https://about.gitlab.com/pricing/#self-managed) with GitLab version
|
|
12.5 or later. This will ensure the GitLab UI can be used for cluster creation.
|
|
- The following GitLab access:
|
|
- [Maintainer access to a project](../../permissions.md#project-members-permissions) for a
|
|
project-level cluster.
|
|
- [Maintainer access to a group](../../permissions.md#group-members-permissions) for a
|
|
group-level cluster.
|
|
- [Admin Area access](../../admin_area/index.md) for a self-managed instance-level
|
|
cluster. **(CORE ONLY)**
|
|
|
|
### GKE requirements
|
|
|
|
Before creating your first cluster on Google GKE with GitLab's integration, make sure the following
|
|
requirements are met:
|
|
|
|
- A [billing account](https://cloud.google.com/billing/docs/how-to/manage-billing-account)
|
|
set up with access.
|
|
- The Kubernetes Engine API and related service are enabled. It should work immediately but may
|
|
take up to 10 minutes after you create a project. For more information see the
|
|
["Before you begin" section of the Kubernetes Engine docs](https://cloud.google.com/kubernetes-engine/docs/quickstart#before-you-begin).
|
|
|
|
### EKS requirements
|
|
|
|
Before creating your first cluster on Amazon EKS with GitLab's integration, make sure the following
|
|
requirements are met:
|
|
|
|
- An [Amazon Web Services](https://aws.amazon.com/) account is set up and you are able to log in.
|
|
- You have permissions to manage IAM resources.
|
|
- If you want to use an [existing EKS cluster](#existing-eks-cluster):
|
|
- An Amazon EKS cluster with worker nodes properly configured.
|
|
- `kubectl` [installed and configured](https://docs.aws.amazon.com/eks/latest/userguide/getting-started.html#get-started-kubectl)
|
|
for access to the EKS cluster.
|
|
|
|
#### Additional requirements for self-managed instances **(CORE ONLY)**
|
|
|
|
If you are using a self-managed GitLab instance, GitLab must first be configured with a set of
|
|
Amazon credentials. These credentials will be used to assume an Amazon IAM role provided by the user
|
|
creating the cluster. Create an IAM user and ensure it has permissions to assume the role(s) that
|
|
your users will use to create EKS clusters.
|
|
|
|
For example, the following policy document allows assuming a role whose name starts with
|
|
`gitlab-eks-` in account `123456789012`:
|
|
|
|
```json
|
|
{
|
|
"Version": "2012-10-17",
|
|
"Statement": {
|
|
"Effect": "Allow",
|
|
"Action": "sts:AssumeRole",
|
|
"Resource": "arn:aws:iam::123456789012:role/gitlab-eks-*"
|
|
}
|
|
}
|
|
```
|
|
|
|
Generate an access key for the IAM user, and configure GitLab with the credentials:
|
|
|
|
1. Navigate to **Admin Area > Settings > Integrations** and expand the **Amazon EKS** section.
|
|
1. Check **Enable Amazon EKS integration**.
|
|
1. Enter the account ID and access key credentials into the respective
|
|
`Account ID`, `Access key ID` and `Secret access key` fields.
|
|
1. Click **Save changes**.
|
|
|
|
## Access controls
|
|
|
|
When creating a cluster in GitLab, you will be asked if you would like to create either:
|
|
|
|
- A [Role-based access control (RBAC)](https://kubernetes.io/docs/reference/access-authn-authz/rbac/) cluster.
|
|
- An [Attribute-based access control (ABAC)](https://kubernetes.io/docs/reference/access-authn-authz/abac/) cluster.
|
|
|
|
NOTE: **Note:**
|
|
[RBAC](#rbac-cluster-resources) is recommended and the GitLab default.
|
|
|
|
GitLab creates the necessary service accounts and privileges to install and run
|
|
[GitLab managed applications](index.md#installing-applications). When GitLab creates the cluster,
|
|
a `gitlab` service account with `cluster-admin` privileges is created in the `default` namespace
|
|
to manage the newly created cluster.
|
|
|
|
NOTE: **Note:**
|
|
Restricted service account for deployment was [introduced](https://gitlab.com/gitlab-org/gitlab-foss/issues/51716) in GitLab 11.5.
|
|
|
|
When you install Helm into your cluster, the `tiller` service account
|
|
is created with `cluster-admin` privileges in the `gitlab-managed-apps`
|
|
namespace.
|
|
|
|
This service account will be:
|
|
|
|
- Added to the installed Helm Tiller.
|
|
- Used by Helm to install and run [GitLab managed applications](index.md#installing-applications).
|
|
|
|
Helm will also create additional service accounts and other resources for each
|
|
installed application. Consult the documentation of the Helm charts for each application
|
|
for details.
|
|
|
|
If you are [adding an existing Kubernetes cluster](add_remove_clusters.md#add-existing-cluster),
|
|
ensure the token of the account has administrator privileges for the cluster.
|
|
|
|
The resources created by GitLab differ depending on the type of cluster.
|
|
|
|
### Important notes
|
|
|
|
Note the following about access controls:
|
|
|
|
- Environment-specific resources are only created if your cluster is
|
|
[managed by GitLab](index.md#gitlab-managed-clusters).
|
|
- If your cluster was created before GitLab 12.2, it will use a single namespace for all project
|
|
environments.
|
|
|
|
### RBAC cluster resources
|
|
|
|
GitLab creates the following resources for RBAC clusters.
|
|
|
|
| Name | Type | Details | Created when |
|
|
|:----------------------|:---------------------|:-----------------------------------------------------------------------------------------------------------|:-----------------------|
|
|
| `gitlab` | `ServiceAccount` | `default` namespace | Creating a new cluster |
|
|
| `gitlab-admin` | `ClusterRoleBinding` | [`cluster-admin`](https://kubernetes.io/docs/reference/access-authn-authz/rbac/#user-facing-roles) roleRef | Creating a new cluster |
|
|
| `gitlab-token` | `Secret` | Token for `gitlab` ServiceAccount | Creating a new cluster |
|
|
| `tiller` | `ServiceAccount` | `gitlab-managed-apps` namespace | Installing Helm Tiller |
|
|
| `tiller-admin` | `ClusterRoleBinding` | `cluster-admin` roleRef | Installing Helm Tiller |
|
|
| Environment namespace | `Namespace` | Contains all environment-specific resources | Deploying to a cluster |
|
|
| Environment namespace | `ServiceAccount` | Uses namespace of environment | Deploying to a cluster |
|
|
| Environment namespace | `Secret` | Token for environment ServiceAccount | Deploying to a cluster |
|
|
| Environment namespace | `RoleBinding` | [`edit`](https://kubernetes.io/docs/reference/access-authn-authz/rbac/#user-facing-roles) roleRef | Deploying to a cluster |
|
|
|
|
### ABAC cluster resources
|
|
|
|
GitLab creates the following resources for ABAC clusters.
|
|
|
|
| Name | Type | Details | Created when |
|
|
|:----------------------|:---------------------|:-------------------------------------|:---------------------------|
|
|
| `gitlab` | `ServiceAccount` | `default` namespace | Creating a new cluster |
|
|
| `gitlab-token` | `Secret` | Token for `gitlab` ServiceAccount | Creating a new cluster |
|
|
| `tiller` | `ServiceAccount` | `gitlab-managed-apps` namespace | Installing Helm Tiller |
|
|
| `tiller-admin` | `ClusterRoleBinding` | `cluster-admin` roleRef | Installing Helm Tiller |
|
|
| Environment namespace | `Namespace` | Contains all environment-specific resources | Deploying to a cluster |
|
|
| Environment namespace | `ServiceAccount` | Uses namespace of environment | Deploying to a cluster |
|
|
| Environment namespace | `Secret` | Token for environment ServiceAccount | Deploying to a cluster |
|
|
|
|
### Security of GitLab Runners
|
|
|
|
GitLab Runners have the [privileged mode](https://docs.gitlab.com/runner/executors/docker.html#the-privileged-mode)
|
|
enabled by default, which allows them to execute special commands and running
|
|
Docker in Docker. This functionality is needed to run some of the
|
|
[Auto DevOps](../../../topics/autodevops/index.md)
|
|
jobs. This implies the containers are running in privileged mode and you should,
|
|
therefore, be aware of some important details.
|
|
|
|
The privileged flag gives all capabilities to the running container, which in
|
|
turn can do almost everything that the host can do. Be aware of the
|
|
inherent security risk associated with performing `docker run` operations on
|
|
arbitrary images as they effectively have root access.
|
|
|
|
If you don't want to use GitLab Runner in privileged mode, either:
|
|
|
|
- Use shared Runners on GitLab.com. They don't have this security issue.
|
|
- Set up your own Runners using configuration described at
|
|
[Shared Runners](../../gitlab_com/index.md#shared-runners). This involves:
|
|
1. Making sure that you don't have it installed via
|
|
[the applications](index.md#installing-applications).
|
|
1. Installing a Runner
|
|
[using `docker+machine`](https://docs.gitlab.com/runner/executors/docker_machine.html).
|
|
|
|
## Add new cluster
|
|
|
|
New clusters can be added using GitLab for:
|
|
|
|
- Google Kubernetes Engine.
|
|
- Amazon Elastic Kubernetes Service.
|
|
|
|
### New GKE cluster
|
|
|
|
Starting from [GitLab 12.4](https://gitlab.com/gitlab-org/gitlab/issues/25925), all the GKE clusters
|
|
provisioned by GitLab are [VPC-native](https://cloud.google.com/kubernetes-engine/docs/how-to/alias-ips).
|
|
|
|
#### Important notes
|
|
|
|
Note the following:
|
|
|
|
- The [Google authentication integration](../../../integration/google.md) must be enabled in GitLab
|
|
at the instance level. If that's not the case, ask your GitLab administrator to enable it. On
|
|
GitLab.com, this is enabled.
|
|
- Starting from [GitLab 12.1](https://gitlab.com/gitlab-org/gitlab-foss/issues/55902), all GKE clusters
|
|
created by GitLab are RBAC-enabled. Take a look at the [RBAC section](#rbac-cluster-resources) for
|
|
more information.
|
|
- Starting from [GitLab 12.5](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/18341), the
|
|
cluster's pod address IP range will be set to /16 instead of the regular /14. /16 is a CIDR
|
|
notation.
|
|
- GitLab requires basic authentication enabled and a client certificate issued for the cluster to
|
|
set up an [initial service account](#access-controls). Starting from [GitLab
|
|
11.10](https://gitlab.com/gitlab-org/gitlab-foss/issues/58208), the cluster creation process will
|
|
explicitly request that basic authentication and client certificate is enabled.
|
|
|
|
#### Creating the cluster on GKE
|
|
|
|
To create and add a new Kubernetes cluster to your project, group, or instance:
|
|
|
|
1. Navigate to your:
|
|
- Project's **Operations > Kubernetes** page, for a project-level cluster.
|
|
- Group's **Kubernetes** page, for a group-level cluster.
|
|
- **Admin Area > Kubernetes** page, for an instance-level cluster.
|
|
1. Click **Add Kubernetes cluster**.
|
|
1. Under the **Create new cluster** tab, click **Google GKE**.
|
|
1. Connect your Google account if you haven't done already by clicking the
|
|
**Sign in with Google** button.
|
|
1. Choose your cluster's settings:
|
|
- **Kubernetes cluster name** - The name you wish to give the cluster.
|
|
- **Environment scope** - The [associated environment](index.md#setting-the-environment-scope-premium) to this cluster.
|
|
- **Google Cloud Platform project** - Choose the project you created in your GCP
|
|
console that will host the Kubernetes cluster. Learn more about
|
|
[Google Cloud Platform projects](https://cloud.google.com/resource-manager/docs/creating-managing-projects).
|
|
- **Zone** - Choose the [region zone](https://cloud.google.com/compute/docs/regions-zones/)
|
|
under which the cluster will be created.
|
|
- **Number of nodes** - Enter the number of nodes you wish the cluster to have.
|
|
- **Machine type** - The [machine type](https://cloud.google.com/compute/docs/machine-types)
|
|
of the Virtual Machine instance that the cluster will be based on.
|
|
- **Enable Cloud Run for Anthos** - Check this if you want to use Cloud Run for Anthos for this cluster.
|
|
See the [Cloud Run for Anthos section](#cloud-run-for-anthos) for more information.
|
|
- **GitLab-managed cluster** - Leave this checked if you want GitLab to manage namespaces and service accounts for this cluster.
|
|
See the [Managed clusters section](index.md#gitlab-managed-clusters) for more information.
|
|
1. Finally, click the **Create Kubernetes cluster** button.
|
|
|
|
After a couple of minutes, your cluster will be ready to go. You can now proceed
|
|
to install some [pre-defined applications](index.md#installing-applications).
|
|
|
|
#### Cloud Run for Anthos
|
|
|
|
> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/16566) in GitLab 12.4.
|
|
|
|
You can choose to use Cloud Run for Anthos in place of installing Knative and Istio
|
|
separately after the cluster has been created. This means that Cloud Run
|
|
(Knative), Istio, and HTTP Load Balancing will be enabled on the cluster at
|
|
create time and cannot be [installed or uninstalled](../../clusters/applications.md) separately.
|
|
|
|
### New EKS cluster
|
|
|
|
> [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/22392) in GitLab 12.5.
|
|
|
|
To create and add a new Kubernetes cluster to your project, group, or instance:
|
|
|
|
1. Navigate to your:
|
|
- Project's **Operations > Kubernetes** page, for a project-level cluster.
|
|
- Group's **Kubernetes** page, for a group-level cluster.
|
|
- **Admin Area > Kubernetes** page, for an instance-level cluster.
|
|
1. Click **Add Kubernetes cluster**.
|
|
1. Under the **Create new cluster** tab, click **Amazon EKS**. You will be provided with an
|
|
`Account ID` and `External ID` to use in the next step.
|
|
1. In the [IAM Management Console](https://console.aws.amazon.com/iam/home), create an IAM role:
|
|
1. From the left panel, select **Roles**.
|
|
1. Click **Create role**.
|
|
1. Under `Select type of trusted entity`, select **Another AWS account**.
|
|
1. Enter the Account ID from GitLab into the `Account ID` field.
|
|
1. Check **Require external ID**.
|
|
1. Enter the External ID from GitLab into the `External ID` field.
|
|
1. Click **Next: Permissions**.
|
|
1. Click **Create Policy**, which will open a new window.
|
|
1. Select the **JSON** tab, and paste in the following snippet in place of the existing content:
|
|
|
|
```json
|
|
{
|
|
"Version": "2012-10-17",
|
|
"Statement": [
|
|
{
|
|
"Effect": "Allow",
|
|
"Action": [
|
|
"autoscaling:CreateAutoScalingGroup",
|
|
"autoscaling:DescribeAutoScalingGroups",
|
|
"autoscaling:DescribeScalingActivities",
|
|
"autoscaling:UpdateAutoScalingGroup",
|
|
"autoscaling:CreateLaunchConfiguration",
|
|
"autoscaling:DescribeLaunchConfigurations",
|
|
"cloudformation:CreateStack",
|
|
"cloudformation:DescribeStacks",
|
|
"ec2:AuthorizeSecurityGroupEgress",
|
|
"ec2:AuthorizeSecurityGroupIngress",
|
|
"ec2:RevokeSecurityGroupEgress",
|
|
"ec2:RevokeSecurityGroupIngress",
|
|
"ec2:CreateSecurityGroup",
|
|
"ec2:createTags",
|
|
"ec2:DescribeImages",
|
|
"ec2:DescribeKeyPairs",
|
|
"ec2:DescribeRegions",
|
|
"ec2:DescribeSecurityGroups",
|
|
"ec2:DescribeSubnets",
|
|
"ec2:DescribeVpcs",
|
|
"eks:CreateCluster",
|
|
"eks:DescribeCluster",
|
|
"iam:AddRoleToInstanceProfile",
|
|
"iam:AttachRolePolicy",
|
|
"iam:CreateRole",
|
|
"iam:CreateInstanceProfile",
|
|
"iam:CreateServiceLinkedRole",
|
|
"iam:GetRole",
|
|
"iam:ListRoles",
|
|
"iam:PassRole",
|
|
"ssm:GetParameters"
|
|
],
|
|
"Resource": "*"
|
|
}
|
|
]
|
|
}
|
|
```
|
|
|
|
NOTE: **Note:**
|
|
These permissions give GitLab the ability to create resources, but not delete them.
|
|
This means that if an error is encountered during the creation process, changes will
|
|
not be rolled back and you must remove resources manually. You can do this by deleting
|
|
the relevant [CloudFormation stack](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-console-delete-stack.html)
|
|
|
|
1. Click **Review policy**.
|
|
1. Enter a suitable name for this policy, and click **Create Policy**. You can now close this window.
|
|
1. Switch back to the "Create role" window, and select the policy you just created.
|
|
1. Click **Next: Tags**, and optionally enter any tags you wish to associate with this role.
|
|
1. Click **Next: Review**.
|
|
1. Enter a role name and optional description into the fields provided.
|
|
1. Click **Create role**, the new role name will appear at the top. Click on its name and copy the `Role ARN` from the newly created role.
|
|
1. In GitLab, enter the copied role ARN into the `Role ARN` field.
|
|
1. Click **Authenticate with AWS**.
|
|
1. Choose your cluster's settings:
|
|
- **Kubernetes cluster name** - The name you wish to give the cluster.
|
|
- **Environment scope** - The [associated environment](index.md#setting-the-environment-scope-premium) to this cluster.
|
|
- **Kubernetes version** - The Kubernetes version to use. Currently the only version supported is 1.14.
|
|
- **Role name** - Select the [IAM role](https://docs.aws.amazon.com/eks/latest/userguide/service_IAM_role.html)
|
|
to allow Amazon EKS and the Kubernetes control plane to manage AWS resources on your behalf. This IAM role is separate
|
|
to the IAM role created above, you will need to create it if it does not yet exist.
|
|
- **Region** - The [region](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html)
|
|
in which the cluster will be created.
|
|
- **Key pair name** - Select the [key pair](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html)
|
|
that you can use to connect to your worker nodes if required.
|
|
- **VPC** - Select a [VPC](https://docs.aws.amazon.com/vpc/latest/userguide/what-is-amazon-vpc.html)
|
|
to use for your EKS Cluster resources.
|
|
- **Subnets** - Choose the [subnets](https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Subnets.html)
|
|
in your VPC where your worker nodes will run.
|
|
- **Security group** - Choose the [security group](https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html)
|
|
to apply to the EKS-managed Elastic Network Interfaces that are created in your worker node subnets.
|
|
- **Instance type** - The [instance type](https://aws.amazon.com/ec2/instance-types/) of your worker nodes.
|
|
- **Node count** - The number of worker nodes.
|
|
- **GitLab-managed cluster** - Leave this checked if you want GitLab to manage namespaces and service accounts for this cluster.
|
|
See the [Managed clusters section](index.md#gitlab-managed-clusters) for more information.
|
|
1. Finally, click the **Create Kubernetes cluster** button.
|
|
|
|
After about 10 minutes, your cluster will be ready to go. You can now proceed
|
|
to install some [pre-defined applications](index.md#installing-applications).
|
|
|
|
NOTE: **Note:**
|
|
You will need to add your AWS external ID to the
|
|
[IAM Role in the AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-role.html#cli-configure-role-xaccount)
|
|
to manage your cluster using `kubectl`.
|
|
|
|
## Add existing cluster
|
|
|
|
If you have an existing Kubernetes cluster, you can add it to a project, group, or instance.
|
|
|
|
For more information, see information for adding an:
|
|
|
|
- [Existing Kubernetes cluster](#existing-kubernetes-cluster).
|
|
- [Existing Elastic Kubernetes Service cluster](#existing-eks-cluster).
|
|
|
|
NOTE: **Note:**
|
|
Kubernetes integration is not supported for arm64 clusters. See the issue
|
|
[Helm Tiller fails to install on arm64 cluster](https://gitlab.com/gitlab-org/gitlab-foss/issues/64044) for details.
|
|
|
|
### Existing Kubernetes cluster
|
|
|
|
To add a Kubernetes cluster to your project, group, or instance:
|
|
|
|
1. Navigate to your:
|
|
- Project's **Operations > Kubernetes** page, for a project-level cluster.
|
|
- Group's **Kubernetes** page, for a group-level cluster.
|
|
- **Admin Area > Kubernetes** page, for an instance-level cluster.
|
|
1. Click **Add Kubernetes cluster**.
|
|
1. Click the **Add existing cluster** tab and fill in the details:
|
|
- **Kubernetes cluster name** (required) - The name you wish to give the cluster.
|
|
- **Environment scope** (required) - The
|
|
[associated environment](index.md#setting-the-environment-scope-premium) to this cluster.
|
|
- **API URL** (required) -
|
|
It's 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,
|
|
e.g., `https://kubernetes.example.com` rather than `https://kubernetes.example.com/api/v1`.
|
|
|
|
Get the API URL by running this command:
|
|
|
|
```shell
|
|
kubectl cluster-info | grep 'Kubernetes master' | awk '/http/ {print $NF}'
|
|
```
|
|
|
|
- **CA certificate** (required) - A valid Kubernetes certificate is needed to authenticate to the cluster. We will use the certificate created by default.
|
|
- List the secrets with `kubectl get secrets`, and one should be named similar to
|
|
`default-token-xxxxx`. Copy that token name for use below.
|
|
- Get the certificate by running this command:
|
|
|
|
```shell
|
|
|
|
kubectl get secret <secret name> -o jsonpath="{['data']['ca\.crt']}" | base64 --decode
|
|
|
|
```
|
|
|
|
NOTE: **Note:**
|
|
If the command returns the entire certificate chain, you need copy the *root ca*
|
|
certificate at the bottom of the chain.
|
|
|
|
- **Token** -
|
|
GitLab authenticates against Kubernetes using service tokens, which are
|
|
scoped to a particular `namespace`.
|
|
**The token used should belong to a service account with
|
|
[`cluster-admin`](https://kubernetes.io/docs/reference/access-authn-authz/rbac/#user-facing-roles)
|
|
privileges.** To create this service account:
|
|
|
|
1. Create a file called `gitlab-admin-service-account.yaml` with contents:
|
|
|
|
```yaml
|
|
apiVersion: v1
|
|
kind: ServiceAccount
|
|
metadata:
|
|
name: gitlab-admin
|
|
namespace: kube-system
|
|
---
|
|
apiVersion: rbac.authorization.k8s.io/v1beta1
|
|
kind: ClusterRoleBinding
|
|
metadata:
|
|
name: gitlab-admin
|
|
roleRef:
|
|
apiGroup: rbac.authorization.k8s.io
|
|
kind: ClusterRole
|
|
name: cluster-admin
|
|
subjects:
|
|
- kind: ServiceAccount
|
|
name: gitlab-admin
|
|
namespace: kube-system
|
|
```
|
|
|
|
1. Apply the service account and cluster role binding to your cluster:
|
|
|
|
```shell
|
|
kubectl apply -f gitlab-admin-service-account.yaml
|
|
```
|
|
|
|
You will need the `container.clusterRoleBindings.create` permission
|
|
to create cluster-level roles. If you do not have this permission,
|
|
you can alternatively enable Basic Authentication and then run the
|
|
`kubectl apply` command as an admin:
|
|
|
|
```shell
|
|
kubectl apply -f gitlab-admin-service-account.yaml --username=admin --password=<password>
|
|
```
|
|
|
|
NOTE: **Note:**
|
|
Basic Authentication can be turned on and the password credentials
|
|
can be obtained using the Google Cloud Console.
|
|
|
|
Output:
|
|
|
|
```shell
|
|
serviceaccount "gitlab-admin" created
|
|
clusterrolebinding "gitlab-admin" created
|
|
```
|
|
|
|
1. Retrieve the token for the `gitlab-admin` service account:
|
|
|
|
```shell
|
|
kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep gitlab-admin | awk '{print $1}')
|
|
```
|
|
|
|
Copy the `<authentication_token>` value from the output:
|
|
|
|
```yaml
|
|
Name: gitlab-admin-token-b5zv4
|
|
Namespace: kube-system
|
|
Labels: <none>
|
|
Annotations: kubernetes.io/service-account.name=gitlab-admin
|
|
kubernetes.io/service-account.uid=bcfe66ac-39be-11e8-97e8-026dce96b6e8
|
|
|
|
Type: kubernetes.io/service-account-token
|
|
|
|
Data
|
|
====
|
|
ca.crt: 1025 bytes
|
|
namespace: 11 bytes
|
|
token: <authentication_token>
|
|
```
|
|
|
|
NOTE: **Note:**
|
|
For GKE clusters, you will need the
|
|
`container.clusterRoleBindings.create` permission to create a cluster
|
|
role binding. You can follow the [Google Cloud
|
|
documentation](https://cloud.google.com/iam/docs/granting-changing-revoking-access)
|
|
to grant access.
|
|
|
|
- **GitLab-managed cluster** - Leave this checked if you want GitLab to manage namespaces and service accounts for this cluster.
|
|
See the [Managed clusters section](index.md#gitlab-managed-clusters) for more information.
|
|
|
|
- **Project namespace** (optional) - You don't have to fill it in; by leaving
|
|
it blank, GitLab will create one for you. Also:
|
|
- Each project should have a unique namespace.
|
|
- The project namespace is not necessarily the namespace of the secret, if
|
|
you're using a secret with broader permissions, like the secret from `default`.
|
|
- You should **not** use `default` as the project namespace.
|
|
- If you or someone created a secret specifically for the project, usually
|
|
with limited permissions, the secret's namespace and project namespace may
|
|
be the same.
|
|
|
|
1. Finally, click the **Create Kubernetes cluster** button.
|
|
|
|
After a couple of minutes, your cluster will be ready to go. You can now proceed
|
|
to install some [pre-defined applications](index.md#installing-applications).
|
|
|
|
### Existing EKS cluster
|
|
|
|
To add an existing EKS cluster to your project, group, or instance:
|
|
|
|
1. Perform the following steps on the EKS cluster:
|
|
1. Retrieve the certificate. A valid Kubernetes certificate is needed to authenticate to the
|
|
EKS cluster. We will use the certificate created by default.
|
|
Open a shell and use `kubectl` to retrieve it:
|
|
|
|
1. List the secrets with `kubectl get secrets`, and one should named similar to
|
|
`default-token-xxxxx`. Copy that token name for use below.
|
|
1. Get the certificate with:
|
|
|
|
```shell
|
|
kubectl get secret <secret name> -o jsonpath="{['data']['ca\.crt']}" | base64 --decode
|
|
```
|
|
|
|
1. Create admin token. A `cluster-admin` token is required to install and manage Helm Tiller.
|
|
GitLab establishes mutual SSL authentication with Helm Tiller and creates limited service
|
|
accounts for each application. To create the token we will create an admin service account as
|
|
follows:
|
|
|
|
1. Create a file called `eks-admin-service-account.yaml` with contents:
|
|
|
|
```yaml
|
|
apiVersion: v1
|
|
kind: ServiceAccount
|
|
metadata:
|
|
name: eks-admin
|
|
namespace: kube-system
|
|
```
|
|
|
|
1. Apply the service account to your cluster:
|
|
|
|
```shell
|
|
$ kubectl apply -f eks-admin-service-account.yaml
|
|
serviceaccount "eks-admin" created
|
|
```
|
|
|
|
1. Create a file called `eks-admin-cluster-role-binding.yaml` with contents:
|
|
|
|
```yaml
|
|
apiVersion: rbac.authorization.k8s.io/v1beta1
|
|
kind: ClusterRoleBinding
|
|
metadata:
|
|
name: eks-admin
|
|
roleRef:
|
|
apiGroup: rbac.authorization.k8s.io
|
|
kind: ClusterRole
|
|
name: cluster-admin
|
|
subjects:
|
|
- kind: ServiceAccount
|
|
name: eks-admin
|
|
namespace: kube-system
|
|
```
|
|
|
|
1. Apply the cluster role binding to your cluster:
|
|
|
|
```shell
|
|
$ kubectl apply -f eks-admin-cluster-role-binding.yaml
|
|
clusterrolebinding "eks-admin" created
|
|
```
|
|
|
|
1. Retrieve the token for the `eks-admin` service account:
|
|
|
|
```shell
|
|
kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep eks-admin | awk '{print $1}')
|
|
```
|
|
|
|
Copy the `<authentication_token>` value from the output:
|
|
|
|
```yaml
|
|
Name: eks-admin-token-b5zv4
|
|
Namespace: kube-system
|
|
Labels: <none>
|
|
Annotations: kubernetes.io/service-account.name=eks-admin
|
|
kubernetes.io/service-account.uid=bcfe66ac-39be-11e8-97e8-026dce96b6e8
|
|
|
|
Type: kubernetes.io/service-account-token
|
|
|
|
Data
|
|
====
|
|
ca.crt: 1025 bytes
|
|
namespace: 11 bytes
|
|
token: <authentication_token>
|
|
```
|
|
|
|
1. Locate the the API server endpoint so GitLab can connect to the cluster. This is displayed on
|
|
the AWS EKS console, when viewing the EKS cluster details.
|
|
1. Navigate to your:
|
|
- Project's **Operations > Kubernetes** page, for a project-level cluster.
|
|
- Group's **Kubernetes** page, for a group-level cluster.
|
|
- **Admin Area > Kubernetes** page, for an instance-level cluster.
|
|
1. Click **Add Kubernetes cluster**.
|
|
1. Click the **Add existing cluster** tab and fill in the details:
|
|
- **Kubernetes cluster name**: A name for the cluster to identify it within GitLab.
|
|
- **Environment scope**: Leave this as `*` for now, since we are only connecting a single cluster.
|
|
- **API URL**: The API server endpoint retrieved earlier.
|
|
- **CA Certificate**: The certificate data from the earlier step, as-is.
|
|
- **Service Token**: The admin token value.
|
|
- For project-level clusters, **Project namespace prefix**: This can be left blank to accept the
|
|
default namespace, based on the project name.
|
|
1. Click on **Add Kubernetes cluster**. The cluster is now connected to GitLab.
|
|
|
|
At this point, [Kubernetes deployment variables](index.md#deployment-variables) will
|
|
automatically be available during CI/CD jobs, making it easy to interact with the cluster.
|
|
|
|
If you would like to utilize your own CI/CD scripts to deploy to the cluster, you can stop here.
|
|
|
|
#### Disable Role-Based Access Control (RBAC) (optional)
|
|
|
|
When connecting a cluster via GitLab integration, you may specify whether the
|
|
cluster is RBAC-enabled or not. This will affect how GitLab interacts with the
|
|
cluster for certain operations. If you **did not** check the "RBAC-enabled cluster"
|
|
checkbox at creation time, GitLab will assume RBAC is disabled for your cluster
|
|
when interacting with it. If so, you must disable RBAC on your cluster for the
|
|
integration to work properly.
|
|
|
|
![rbac](img/rbac.png)
|
|
|
|
NOTE: **Note**: Disabling RBAC means that any application running in the cluster,
|
|
or user who can authenticate to the cluster, has full API access. This is a
|
|
[security concern](index.md#security-implications), and may not be desirable.
|
|
|
|
To effectively disable RBAC, global permissions can be applied granting full access:
|
|
|
|
```shell
|
|
kubectl create clusterrolebinding permissive-binding \
|
|
--clusterrole=cluster-admin \
|
|
--user=admin \
|
|
--user=kubelet \
|
|
--group=system:serviceaccounts
|
|
```
|
|
|
|
#### Create a default Storage Class
|
|
|
|
Amazon EKS doesn't have a default Storage Class out of the box, which means
|
|
requests for persistent volumes will not be automatically fulfilled. As part
|
|
of Auto DevOps, the deployed Postgres instance requests persistent storage,
|
|
and without a default storage class it will fail to start.
|
|
|
|
If a default Storage Class doesn't already exist and is desired, follow Amazon's
|
|
[guide on storage classes](https://docs.aws.amazon.com/eks/latest/userguide/storage-classes.html)
|
|
to create one.
|
|
|
|
Alternatively, disable Postgres by setting the project variable
|
|
[`POSTGRES_ENABLED`](../../../topics/autodevops/#environment-variables) to `false`.
|
|
|
|
#### Deploy the app to EKS
|
|
|
|
With RBAC disabled and services deployed,
|
|
[Auto DevOps](../../../topics/autodevops/index.md) can now be leveraged
|
|
to build, test, and deploy the app.
|
|
|
|
[Enable Auto DevOps](../../../topics/autodevops/index.md#at-the-project-level)
|
|
if not already enabled. If a wildcard DNS entry was created resolving to the
|
|
Load Balancer, enter it in the `domain` field under the Auto DevOps settings.
|
|
Otherwise, the deployed app will not be externally available outside of the cluster.
|
|
|
|
![Deploy Pipeline](img/pipeline.png)
|
|
|
|
A new pipeline will automatically be created, which will begin to build, test,
|
|
and deploy the app.
|
|
|
|
After the pipeline has finished, your app will be running in EKS and available
|
|
to users. Click on **CI/CD > Environments**.
|
|
|
|
![Deployed Environment](img/environment.png)
|
|
|
|
You will see a list of the environments and their deploy status, as well as
|
|
options to browse to the app, view monitoring metrics, and even access a shell
|
|
on the running pod.
|
|
|
|
## Enabling or disabling integration
|
|
|
|
After you have successfully added your cluster information, you can enable the
|
|
Kubernetes cluster integration:
|
|
|
|
1. Click the **Enabled/Disabled** switch
|
|
1. Hit **Save** for the changes to take effect
|
|
|
|
To disable the Kubernetes cluster integration, follow the same procedure.
|
|
|
|
## Removing integration
|
|
|
|
To remove the Kubernetes cluster integration from your project, either:
|
|
|
|
- Select **Remove integration**, to remove only the Kubernetes integration.
|
|
- [From GitLab 12.6](https://gitlab.com/gitlab-org/gitlab/issues/26815), select
|
|
**Remove integration and resources**, to also remove all related GitLab cluster resources (for
|
|
example, namespaces, roles, and bindings) when removing the integration.
|
|
|
|
When removing the cluster integration, note:
|
|
|
|
- You need Maintainer [permissions](../../permissions.md) and above to remove a Kubernetes cluster
|
|
integration.
|
|
- When you remove a cluster, you only remove its relationship to GitLab, not the cluster itself. To
|
|
remove the cluster, you can do so by visiting the GKE or EKS dashboard, or using `kubectl`.
|
|
|
|
## Learn more
|
|
|
|
To learn more on automatically deploying your applications,
|
|
read about [Auto DevOps](../../../topics/autodevops/index.md).
|