Skip to content

G
gitlab-ce
Commit 2847f795 authored by Craig Norris's avatar Craig Norris
Browse files
Options

Merge branch 'docs-k8s-agent-review' into 'master' 

Docs: Refactor K8s Agent doc

See merge request gitlab-org/gitlab!72149
parents 7e39dd28 132caf77
Hide whitespace changes
Inline Side-by-side
Showing with 430 additions and 383 deletions
doc/administration/clusters/kas.md
View file @ 2847f795
......@@ -10,7 +10,7 @@ The Kubernetes Agent Server (KAS) is a GitLab backend service dedicated to
managing [Kubernetes Agents](../../user/clusters/agent/index.md).
The KAS is already installed and available in GitLab.com under `wss://kas.gitlab.com`.
See [how to use GitLab.com's KAS](../../user/clusters/agent/index.md#set-up-the-kubernetes-agent-server).
See [how to use GitLab.com's KAS](../../user/clusters/agent/install/index.md#set-up-the-kubernetes-agent-server).
This document describes how to install a KAS for GitLab self-managed instances.
## Installation options
......
doc/user/application_security/policies/index.md
View file @ 2847f795
......@@ -159,7 +159,7 @@ at the bottom of the editor.
You can use policy alerts to track your policy's impact. Alerts are only available if you've
[installed](../../clusters/agent/repository.md)
and [configured](../../clusters/agent/index.md#create-an-agent-record-in-gitlab)
and [configured](../../clusters/agent/install/index.md#create-an-agent-record-in-gitlab)
a Kubernetes Agent for this project.
There are two ways to create policy alerts:
......
doc/user/clusters/agent/ci_cd_tunnel.md
View file @ 2847f795
......@@ -21,11 +21,11 @@ Only CI/CD jobs set in the configuration project can access one of the configure
## Prerequisites
- A running [`kas` instance](index.md#set-up-the-kubernetes-agent-server).
- A [configuration repository](index.md#define-a-configuration-repository) with an Agent config file
- A running [`kas` instance](install/index.md#set-up-the-kubernetes-agent-server).
- A [configuration repository](install/index.md#define-a-configuration-repository) with an Agent config file
installed (`.gitlab/agents/<agent-name>/config.yaml`).
- An [Agent record](index.md#create-an-agent-record-in-gitlab).
- The Agent [installed in the cluster](index.md#install-the-agent-into-the-cluster).
- An [Agent record](install/index.md#create-an-agent-record-in-gitlab).
- The Agent [installed in the cluster](install/index.md#install-the-agent-into-the-cluster).
## Use the CI/CD Tunnel to run Kubernetes commands from GitLab CI/CD
......
doc/user/clusters/agent/index.md
View file @ 2847f795
......@@ -7,28 +7,54 @@ info: To determine the technical writer assigned to the Stage/Group associated w
# GitLab Kubernetes Agent **(PREMIUM)**
> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/223061) in [GitLab Premium](https://about.gitlab.com/pricing/) 13.4.
> - [Introduced](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/issues/7) in GitLab 13.6, `grpcs` is supported.
> - Support for `grpcs` [introduced](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/issues/7) in GitLab 13.6.
> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/300960) in GitLab 13.10, KAS became available on GitLab.com under `wss://kas.gitlab.com` through an Early Adopter Program.
> - Introduced in GitLab 13.11, the GitLab Kubernetes Agent became available to every project on GitLab.com.
The [GitLab Kubernetes Agent](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent)
is an active in-cluster component for solving GitLab and Kubernetes integration
tasks in a secure and cloud-native way. It enables:
The [GitLab Kubernetes Agent](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent) ("Agent", for short)
is an active in-cluster component for connecting Kubernetes clusters to GitLab safely to support cloud-native deployment, management, and monitoring.
- GitLab integration with a Kubernetes cluster behind a firewall or NAT
(network address translation).
- Pull-based GitOps deployments.
- [Inventory object](../../infrastructure/clusters/deploy/inventory_object.md) to keep track of objects applied to your cluster.
- Real-time access to API endpoints in a cluster.
- Alert generation based on [Container network policy](../../application_security/policies/index.md#container-network-policy).
- [CI/CD Tunnel](ci_cd_tunnel.md) that enables users to access Kubernetes clusters from GitLab CI/CD jobs even if there is no network connectivity between GitLab Runner and a cluster.
The Agent is installed into the cluster through code, providing you with a fast, safe, stable, and scalable solution.
Many more features are planned. Please review [our roadmap](https://gitlab.com/groups/gitlab-org/-/epics/3329)
and [our development documentation](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/tree/master/doc).
With GitOps, you can manage containerized clusters and applications from a Git repository that:
## GitLab Agent GitOps workflow
- Is the single source of truth of your system.
- Is the single place where you operate your system.
- Is a single resource to monitor your system.
The GitLab Agent, herein _Agent_, uses multiple GitLab projects to provide a flexible workflow
By combining GitLab, Kubernetes, and GitOps, it results in a robust infrastructure:
- GitLab as the GitOps operator.
- Kubernetes as the automation and convergence system.
- GitLab CI/CD as the Continuous Integration and Continuous Deployment engine.
Beyond that, you can use all the features offered by GitLab as
the all-in-one DevOps platform for your product and your team.
## Agent's features
By using the GitLab Kubernetes Agent, you can:
- Connect GitLab with a Kubernetes cluster behind a firewall or a
Network Address Translation (NAT).
- Have real-time access to API endpoints in your cluster from GitLab CI/CD.
- Use GitOps to configure your cluster through the [Agent's repository](repository.md).
- Perform pull-based or push-based GitOps deployments.
- Configure [Network Security Alerts](#kubernetes-network-security-alerts)
based on [Container Network Policies](../../application_security/policies/index.md#container-network-policy).
- Track objects applied to your cluster through [inventory objects](../../infrastructure/clusters/deploy/inventory_object.md).
- Use the [CI/CD Tunnel](ci_cd_tunnel.md) to access Kubernetes clusters
from GitLab CI/CD jobs while keeping the cluster's APIs safe and unexposed
to the internet.
- [Deploy the GitLab Runner in a Kubernetes cluster](https://docs.gitlab.com/runner/install/kubernetes-agent.html).
See the [GitLab Kubernetes Agent roadmap](https://gitlab.com/groups/gitlab-org/-/epics/3329) to track its development.
To contribute to the Agent, see the [Agent's development documentation](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/tree/master/doc).
## Agent's workflow
The Agent uses multiple GitLab projects to provide a flexible workflow
that can suit various needs. This diagram shows these repositories and the main
actors involved in a deployment:
......@@ -50,363 +76,33 @@ sequenceDiagram
end
```
There are several components that work in concert for the Agent to accomplish GitOps deployments:
- A properly-configured Kubernetes cluster where the Agent is running.
- A configuration repository that contains a `config.yaml` file, which tells the
Agent the repositories to synchronize with the cluster.
- A manifest repository that contains manifest files. Any changes to manifest files are applied to the cluster.
You can use the same GitLab project or projects for configuration and manifest files, as follows:
- Single GitLab project (recommended): when you use a single repository to hold both the manifest and the configuration files, these projects can be either private or public, as you prefer.
- Two GitLab projects: when you opt to use two different GitLab projects, one for manifest files, and another for configuration files, the manifests project must be public, while the configuration project can be either private or public. Our backlog contains issues for adding support for
[private manifest repositories outside of the configuration project](https://gitlab.com/gitlab-org/gitlab/-/issues/220912) and
[group level agents](https://gitlab.com/gitlab-org/gitlab/-/issues/283885) in the future.
For more details, please refer to our [full architecture documentation](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/blob/master/doc/architecture.md#high-level-architecture) in the Agent project.
## Get started with GitOps and the GitLab Agent
The setup process involves a few steps to enable GitOps deployments:
1. [Set up the Kubernetes Agent Server](#set-up-the-kubernetes-agent-server) for your GitLab instance.
1. [Define a configuration repository](#define-a-configuration-repository).
1. [Create an Agent record in GitLab](#create-an-agent-record-in-gitlab).
1. [Install the Agent into the cluster](#install-the-agent-into-the-cluster).
1. [Generate and copy a Secret token used to connect to the Agent](#create-the-kubernetes-secret).
1. [Create manifest files](#create-manifest-files).
<i class="fa fa-youtube-play youtube" aria-hidden="true"></i> Watch a GitLab 14.2 [walking-through video](https://www.youtube.com/watch?v=XuBpKtsgGkE) with this process.
### Upgrades and version compatibility
As the GitLab Kubernetes Agent is a new product, we are constantly adding new features
to it. As a result, while shipped features are production ready, its internal API is
neither stable nor versioned yet. For this reason, GitLab only guarantees compatibility
between corresponding major.minor (X.Y) versions of GitLab and its cluster side
component, `agentk`.
Upgrade your agent installations together with GitLab upgrades. To decide which version of `agentk` to install follow:
1. Open the [`GITLAB_KAS_VERSION`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/GITLAB_KAS_VERSION) file from the GitLab Repository, which contains the latest `agentk` version associated with the `master` branch.
1. Change the `master` branch and select the Git tag associated with your version. For instance, you could change it to GitLab [v13.5.3-ee release](https://gitlab.com/gitlab-org/gitlab/-/blob/v13.5.3-ee/GITLAB_KAS_VERSION)
The available `agentk` and `kas` versions can be found in
[the container registry](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/container_registry/).
### Set up the Kubernetes Agent Server
> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/3834) in [GitLab Premium](https://about.gitlab.com/pricing/) 13.10, the GitLab Kubernetes Agent Server (KAS) became available on GitLab.com under `wss://kas.gitlab.com`.
To use the KAS:
- If you are a self-managed user, follow the instructions to [install the Kubernetes Agent Server](../../../administration/clusters/kas.md).
- If you are a GitLab.com user, when you [set up the configuration repository](#define-a-configuration-repository) for your agent, use `wss://kas.gitlab.com` as the `--kas-address`.
### Define a configuration repository
> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/259669) in GitLab 13.7, the Agent manifest configuration can be added to multiple directories (or subdirectories) of its repository.
> - Group authorization was [introduced](https://gitlab.com/groups/gitlab-org/-/epics/5784) in GitLab 14.3.
To configure an Agent, you need:
1. A GitLab repository to hold the configuration file.
1. Install the Agent in a cluster.
After installed, when you update the configuration file, GitLab transmits the
information to the cluster automatically without downtime.
In your repository, add the Agent configuration file under:
```plaintext
.gitlab/agents/<agent-name>/config.yaml
```
Your `config.yaml` file specifies all configurations of the Agent, such as:
- The manifest projects to synchronize.
- The groups that can access this Agent via the [CI/CD Tunnel](ci_cd_tunnel.md).
- The address of the `hubble-relay` for the Network Security policy integrations.
As an example, a minimal Agent configuration that sets up only the manifest
synchronizations is:
```yaml
gitops:
manifest_projects:
- id: "path-to/your-manifest-project-1"
paths:
- glob: '/**/*.{yaml,yml,json}'
```
All the options for the [Kubernetes Agent configuration repository](repository.md) are documented separately.
### Create an Agent record in GitLab
> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/5786) in GitLab 14.1, you can create a new Agent record directly from the GitLab UI.
Next, create a GitLab Rails Agent record to associate it with
the configuration repository project. Creating this record also creates a Secret needed to configure
the Agent in subsequent steps.
In GitLab:
1. From your project's sidebar, select **Infrastructure > Kubernetes clusters**.
1. Select the **GitLab Agent managed clusters** tab.
1. Select **Integrate with the GitLab Agent**.
1. From the **Select an Agent** dropdown menu, select the Agent you want to connect and select **Next** to access the installation form.
1. The form reveals your registration token. Securely store this secret token as you cannot view it again.
1. Copy the command under **Recommended installation method**.
In your computer:
1. Open your local terminal and connect to your cluster.
1. Run the command you copied from the installation form.
### Install the Agent into the cluster
To install the in-cluster component of the Agent, first you need to define a namespace. To create a new namespace,
for example, `gitlab-kubernetes-agent`, run:
```shell
kubectl create namespace gitlab-kubernetes-agent
```
To perform a one-liner installation, run the command below. Make sure to replace:
- `your-agent-token` with the token received from the previous step (identified as `secret` in the JSON output).
- `gitlab-kubernetes-agent` with the namespace you defined in the previous step.
- `wss://kas.gitlab.example.com` with the configured access of the Kubernetes Agent Server (KAS). For GitLab.com users, the KAS is available under `wss://kas.gitlab.com`.
- `--agent-version=vX.Y.Z` with the latest released patch version matching your GitLab installation's major and minor versions. For example, for GitLab v13.9.0, use `--agent-version=v13.9.1`. You can find your GitLab version under the "Help/Help" menu.
```shell
docker run --pull=always --rm registry.gitlab.com/gitlab-org/cluster-integration/gitlab-agent/cli:stable generate --agent-token=your-agent-token --kas-address=wss://kas.gitlab.example.com --agent-version=vX.Y.Z --namespace gitlab-kubernetes-agent | kubectl apply -f -
```
WARNING:
`--agent-version stable` can be used to refer to the latest stable release at the time when the command runs. It's fine for
testing purposes but for production please make sure to specify a matching version explicitly.
To find out the various options the above Docker container supports, run:
```shell
docker run --pull=always --rm registry.gitlab.com/gitlab-org/cluster-integration/gitlab-agent/cli:stable generate --help
```
#### Advanced installation
For more advanced configurations, we recommend to use [the `kpt` based installation method](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/tree/master/build/deployment/gitlab-agent).
Otherwise, follow the manual installation steps described below.
### Create the Kubernetes secret
After generating the token, you must apply it to the Kubernetes cluster.
To create your Secret, run:
```shell
kubectl create secret generic -n gitlab-kubernetes-agent gitlab-kubernetes-agent-token --from-literal=token='YOUR_AGENT_TOKEN'
```
The following example file contains the
Kubernetes resources required for the Agent to be installed. You can modify this
example [`resources.yml` file](#example-resourcesyml-file) in the following ways:
- Replace `namespace: gitlab-kubernetes-agent` with `namespace: <YOUR-DESIRED-NAMESPACE>`.
- You can configure `kas-address` (Kubernetes Agent Server) in several ways.
The agent can use the WebSockets or gRPC protocols to connect to the Agent Server.
Select the option appropriate for your cluster configuration and GitLab architecture:
- The `wss` scheme (an encrypted WebSockets connection) is specified by default
after you install the `gitlab-kas` sub-chart, or enable `gitlab-kas` for Omnibus GitLab.
When using the sub-chart, you must set `wss://kas.host.tld:443` as
`kas-address`, where `host.tld` is the domain you've setup for your GitLab installation.
When using Omnibus GitLab, you must set `wss://GitLab.host.tld:443/-/kubernetes-agent/` as
`kas-address`, where `GitLab.host.tld` is your GitLab hostname.
- When using the sub-chart, specify the `ws` scheme (such as `ws://kas.host.tld:80`)
to use an unencrypted WebSockets connection.
When using the Omnibus GitLab, specify the `ws` scheme (such as `ws://GitLab.host.tld:80/-/kubernetes-agent/`).
- Specify the `grpc` scheme if both Agent and Server are installed in one cluster.
In this case, you may specify `kas-address` value as
`grpc://gitlab-kas.<your-namespace>:8150`) to use gRPC directly, where `gitlab-kas`
is the name of the service created by `gitlab-kas` chart, and `<your-namespace>`
is the namespace where the chart was installed.
- Specify the `grpcs` scheme to use an encrypted gRPC connection.
- When deploying KAS through the [GitLab chart](https://docs.gitlab.com/charts/), it's possible to customize the
`kas-address` for `wss` and `ws` schemes to whatever you need.
Check the [chart's KAS Ingress documentation](https://docs.gitlab.com/charts/charts/gitlab/kas/#ingress)
to learn more about it.
- In the near future, Omnibus GitLab intends to provision `gitlab-kas` under a sub-domain by default, instead of the `/-/kubernetes-agent/` path. Please follow [this issue](https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/5784) for details.
- If you defined your own secret name, replace `gitlab-kubernetes-agent-token` with your
secret name in the `secretName:` section.
To apply this file, run the following command:
```shell
kubectl apply -n gitlab-kubernetes-agent -f ./resources.yml
```
To review your configuration, run the following command:
```shell
$ kubectl get pods -n gitlab-kubernetes-agent
NAMESPACE NAME READY STATUS RESTARTS AGE
gitlab-kubernetes-agent gitlab-kubernetes-agent-77689f7dcb-5skqk 1/1 Running 0 51s
```
#### Example `resources.yml` file
```yaml
---
apiVersion: v1
kind: Namespace
metadata:
name: gitlab-kubernetes-agent
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: gitlab-kubernetes-agent
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: gitlab-kubernetes-agent
spec:
replicas: 1
selector:
matchLabels:
app: gitlab-kubernetes-agent
template:
metadata:
labels:
app: gitlab-kubernetes-agent
spec:
serviceAccountName: gitlab-kubernetes-agent
containers:
- name: agent
# Make sure to specify a matching version for production
image: "registry.gitlab.com/gitlab-org/cluster-integration/gitlab-agent/agentk:vX.Y.Z
args:
- --token-file=/config/token
- --kas-address
- wss://kas.host.tld:443 # replace this line with the line below if using Omnibus GitLab or GitLab.com.
# - wss://gitlab.host.tld:443/-/kubernetes-agent/
# - wss://kas.gitlab.com # for GitLab.com users, use this KAS.
# - grpc://host.docker.internal:8150 # use this attribute when connecting from Docker.
volumeMounts:
- name: token-volume
mountPath: /config
volumes:
- name: token-volume
secret:
secretName: gitlab-kubernetes-agent-token
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 0
maxUnavailable: 1
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: gitlab-kubernetes-agent-write
rules:
- resources:
- '*'
apiGroups:
- '*'
verbs:
- create
- update
- delete
- patch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: gitlab-kubernetes-agent-write-binding
roleRef:
name: gitlab-kubernetes-agent-write
kind: ClusterRole
apiGroup: rbac.authorization.k8s.io
subjects:
- name: gitlab-kubernetes-agent
kind: ServiceAccount
namespace: gitlab-kubernetes-agent
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: gitlab-kubernetes-agent-read
rules:
- resources:
- '*'
apiGroups:
- '*'
verbs:
- get
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: gitlab-kubernetes-agent-read-binding
roleRef:
name: gitlab-kubernetes-agent-read
kind: ClusterRole
apiGroup: rbac.authorization.k8s.io
subjects:
- name: gitlab-kubernetes-agent
kind: ServiceAccount
namespace: gitlab-kubernetes-agent
```
### Create manifest files
In a previous step, you configured a `config.yaml` to point to the GitLab projects
the Agent should synchronize. Agent monitors each of those projects for changes to the manifest files it contains. You can auto-generate manifest files with a
templating engine or other means.
The agent is authorized to download manifests for the configuration
project, and public projects. Support for other private projects is
planned in the issue [Agent authorization for private manifest
projects](https://gitlab.com/gitlab-org/gitlab/-/issues/220912).
Each time you push a change to a monitored manifest repository, the Agent logs the change:
```plaintext
2020-09-15_14:09:04.87946 gitlab-k8s-agent : time="2020-09-15T10:09:04-04:00" level=info msg="Config: new commit" agent_id=1 commit_id=e6a3651f1faa2e928fe6120e254c122451be4eea
```
For more details, refer to our [architecture documentation](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/blob/master/doc/architecture.md#high-level-architecture) in the Agent project.
#### Example manifest file
## Install the Agent in your cluster
This file creates a minimal `ConfigMap`:
See how to [install the GitLab Kubernetes Agent in your cluster](install/index.md).
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: demo-map
namespace: gitlab-kubernetes-agent # Can be any namespace managed by you that the agent has access to.
data:
key: value
```
## GitOps deployments
## Example projects
To perform GitOps deployments with the Agent, you need:
The following example projects can help you get started with the Kubernetes Agent.
- A properly-configured Kubernetes cluster where the Agent is running.
- A [configuration repository](repository.md) that contains a
`config.yaml` file, which tells the Agent the repositories to synchronize
with the cluster.
- A manifest repository that contains manifest files. Any changes to manifest files are applied to the cluster.
- [Configuration repository](https://gitlab.com/gitlab-org/configure/examples/kubernetes-agent)
- This basic GitOps example deploys NGINX: [Manifest repository](https://gitlab.com/gitlab-org/configure/examples/gitops-project)
You can use a single GitLab project or different projects for the Agent
configuration and manifest files, as follows:
### GitLab Runner Deployment with the Agent
- Single GitLab project (recommended): When you use a single repository to hold
both the manifest and the configuration files, these projects can be either
private or public.
- Two GitLab projects: When you use two different GitLab projects (one for
manifest files and another for configuration files), the manifests project must
be public, while the configuration project can be either private or public.
You can use the Kubernetes Agent to
[deploy GitLab Runner in a Kubernetes cluster](https://docs.gitlab.com/runner/install/kubernetes-agent.html).
Support for private manifest repositories is tracked in this [issue](https://gitlab.com/gitlab-org/gitlab/-/issues/220912).
## Kubernetes Network Security Alerts
......@@ -426,24 +122,12 @@ There are several components that work in concert for the Agent to generate the
- Add the required labels and annotations to existing network policies.
- A configuration repository with [Cilium configured in `config.yaml`](repository.md#surface-network-security-alerts-from-cluster-to-gitlab)
The setup process follows the same steps as [GitOps](#get-started-with-gitops-and-the-gitlab-agent),
The setup process follows the same [Agent's installation steps](install/index.md),
with the following differences:
- When you define a configuration repository, you must do so with [Cilium settings](repository.md#surface-network-security-alerts-from-cluster-to-gitlab).
- You do not need to specify the `gitops` configuration section.
## Management interfaces
Users with at least the [Developer](../../permissions.md) can access the user interface
for the GitLab Kubernetes agent at **Infrastructure > Kubernetes clusters**, under the
**GitLab Agent managed clusters** tab. This page lists all registered agents for
the current project, and the configuration directory for each agent:
![GitLab Kubernetes Agent list UI](../img/kubernetes-agent-ui-list_v13_8.png)
Additional management interfaces are planned for the GitLab Kubernetes Agent.
[Provide more feedback in the related epic](https://gitlab.com/groups/gitlab-org/-/epics/4739).
## Remove the GitLab Kubernetes Agent
1. Remove an Agent record with GraphQL by deleting the `clusterAgent` and the `clusterAgentToken`.
......
doc/user/clusters/agent/install/index.md 0 → 100644
View file @ 2847f795
---
stage: Configure
group: Configure
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---
# Install the GitLab Kubernetes Agent **(PREMIUM)**
To get started with the GitLab Kubernetes Agent, install it in your cluster.
Pre-requisites:
- An existing Kubernetes cluster.
- An account on GitLab.
## Installation steps
To install the [GitLab Kubernetes Agent](../index.md) in your cluster:
1. [Set up the Kubernetes Agent Server](#set-up-the-kubernetes-agent-server) for your GitLab instance.
1. [Define a configuration repository](#define-a-configuration-repository).
1. [Create an Agent record in GitLab](#create-an-agent-record-in-gitlab).
1. [Install the Agent into the cluster](#install-the-agent-into-the-cluster).
1. [Generate and copy a Secret token used to connect to the Agent](#create-the-kubernetes-secret).
1. [Create manifest files](#create-manifest-files).
<i class="fa fa-youtube-play youtube" aria-hidden="true"></i> Watch a GitLab 14.2 [walking-through video](https://www.youtube.com/watch?v=XuBpKtsgGkE) with this process.
### Set up the Kubernetes Agent Server
> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/3834) in [GitLab Premium](https://about.gitlab.com/pricing/) 13.10, the GitLab Kubernetes Agent Server (KAS) became available on GitLab.com under `wss://kas.gitlab.com`.
To use the KAS:
- If you are a self-managed user, follow the instructions to [install the Kubernetes Agent Server](../../../../administration/clusters/kas.md).
- If you are a GitLab.com user, when you [set up the configuration repository](#define-a-configuration-repository) for your agent, use `wss://kas.gitlab.com` as the `--kas-address`.
### Define a configuration repository
> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/259669) in GitLab 13.7, the Agent manifest configuration can be added to multiple directories (or subdirectories) of its repository.
> - Group authorization was [introduced](https://gitlab.com/groups/gitlab-org/-/epics/5784) in GitLab 14.3.
To configure an Agent, you need:
1. A GitLab repository to hold the configuration file.
1. Install the Agent in a cluster.
After installed, when you update the configuration file, GitLab transmits the
information to the cluster automatically without downtime.
In your repository, add the Agent configuration file under:
```plaintext
.gitlab/agents/<agent-name>/config.yaml
```
Your `config.yaml` file specifies all configurations of the Agent, such as:
- The manifest projects to synchronize.
- The groups that can access this Agent via the [CI/CD Tunnel](../ci_cd_tunnel.md).
- The address of the `hubble-relay` for the Network Security policy integrations.
As an example, a minimal Agent configuration that sets up only the manifest
synchronizations is:
```yaml
gitops:
manifest_projects:
- id: "path-to/your-manifest-project-1"
paths:
- glob: '/**/*.{yaml,yml,json}'
```
All the options for the [Kubernetes Agent configuration repository](../repository.md) are documented separately.
### Create an Agent record in GitLab
> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/5786) in GitLab 14.1, you can create a new Agent record directly from the GitLab UI.
Next, create a GitLab Rails Agent record to associate it with
the configuration repository project. Creating this record also creates a Secret needed to configure
the Agent in subsequent steps.
In GitLab:
1. From your project's sidebar, select **Infrastructure > Kubernetes clusters**.
1. Select the **GitLab Agent managed clusters** tab.
1. Select **Integrate with the GitLab Agent**.
1. From the **Select an Agent** dropdown menu, select the Agent you want to connect and select **Next** to access the installation form.
1. The form reveals your registration token. Securely store this secret token as you cannot view it again.
1. Copy the command under **Recommended installation method**.
In your computer:
1. Open your local terminal and connect to your cluster.
1. Run the command you copied from the installation form.
### Install the Agent into the cluster
To install the in-cluster component of the Agent, first you need to define a namespace. To create a new namespace,
for example, `gitlab-kubernetes-agent`, run:
```shell
kubectl create namespace gitlab-kubernetes-agent
```
To perform a one-liner installation, run the command below. Make sure to replace:
- `your-agent-token` with the token received from the previous step (identified as `secret` in the JSON output).
- `gitlab-kubernetes-agent` with the namespace you defined in the previous step.
- `wss://kas.gitlab.example.com` with the configured access of the Kubernetes Agent Server (KAS). For GitLab.com users, the KAS is available under `wss://kas.gitlab.com`.
- `--agent-version=vX.Y.Z` with the latest released patch version matching your GitLab installation's major and minor versions. For example, for GitLab v13.9.0, use `--agent-version=v13.9.1`. You can find your GitLab version under the "Help/Help" menu.
```shell
docker run --pull=always --rm registry.gitlab.com/gitlab-org/cluster-integration/gitlab-agent/cli:stable generate --agent-token=your-agent-token --kas-address=wss://kas.gitlab.example.com --agent-version=vX.Y.Z --namespace gitlab-kubernetes-agent | kubectl apply -f -
```
WARNING:
`--agent-version stable` can be used to refer to the latest stable release at the time when the command runs. It's fine for
testing purposes but for production please make sure to specify a matching version explicitly.
To find out the various options the above Docker container supports, run:
```shell
docker run --pull=always --rm registry.gitlab.com/gitlab-org/cluster-integration/gitlab-agent/cli:stable generate --help
```
## Advanced installation
For more advanced configurations, we recommend to use [the `kpt` based installation method](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/tree/master/build/deployment/gitlab-agent).
Otherwise, follow the manual installation steps described below.
### Create the Kubernetes secret
After generating the token, you must apply it to the Kubernetes cluster.
To create your Secret, run:
```shell
kubectl create secret generic -n gitlab-kubernetes-agent gitlab-kubernetes-agent-token --from-literal=token='YOUR_AGENT_TOKEN'
```
The following example file contains the
Kubernetes resources required for the Agent to be installed. You can modify this
example [`resources.yml` file](#example-resourcesyml-file) in the following ways:
- Replace `namespace: gitlab-kubernetes-agent` with `namespace: <YOUR-DESIRED-NAMESPACE>`.
- You can configure `kas-address` (Kubernetes Agent Server) in several ways.
The agent can use the WebSockets or gRPC protocols to connect to the Agent Server.
Select the option appropriate for your cluster configuration and GitLab architecture:
- The `wss` scheme (an encrypted WebSockets connection) is specified by default
after you install the `gitlab-kas` sub-chart, or enable `gitlab-kas` for Omnibus GitLab.
When using the sub-chart, you must set `wss://kas.host.tld:443` as
`kas-address`, where `host.tld` is the domain you've setup for your GitLab installation.
When using Omnibus GitLab, you must set `wss://GitLab.host.tld:443/-/kubernetes-agent/` as
`kas-address`, where `GitLab.host.tld` is your GitLab hostname.
- When using the sub-chart, specify the `ws` scheme (such as `ws://kas.host.tld:80`)
to use an unencrypted WebSockets connection.
When using the Omnibus GitLab, specify the `ws` scheme (such as `ws://GitLab.host.tld:80/-/kubernetes-agent/`).
- Specify the `grpc` scheme if both Agent and Server are installed in one cluster.
In this case, you may specify `kas-address` value as
`grpc://gitlab-kas.<your-namespace>:8150`) to use gRPC directly, where `gitlab-kas`
is the name of the service created by `gitlab-kas` chart, and `<your-namespace>`
is the namespace where the chart was installed.
- Specify the `grpcs` scheme to use an encrypted gRPC connection.
- When deploying KAS through the [GitLab chart](https://docs.gitlab.com/charts/), it's possible to customize the
`kas-address` for `wss` and `ws` schemes to whatever you need.
Check the [chart's KAS Ingress documentation](https://docs.gitlab.com/charts/charts/gitlab/kas/#ingress)
to learn more about it.
- In the near future, Omnibus GitLab intends to provision `gitlab-kas` under a sub-domain by default, instead of the `/-/kubernetes-agent/` path. Please follow [this issue](https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/5784) for details.
- If you defined your own secret name, replace `gitlab-kubernetes-agent-token` with your
secret name in the `secretName:` section.
To apply this file, run the following command:
```shell
kubectl apply -n gitlab-kubernetes-agent -f ./resources.yml
```
To review your configuration, run the following command:
```shell
$ kubectl get pods -n gitlab-kubernetes-agent
NAMESPACE NAME READY STATUS RESTARTS AGE
gitlab-kubernetes-agent gitlab-kubernetes-agent-77689f7dcb-5skqk 1/1 Running 0 51s
```
#### Example `resources.yml` file
```yaml
---
apiVersion: v1
kind: Namespace
metadata:
name: gitlab-kubernetes-agent
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: gitlab-kubernetes-agent
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: gitlab-kubernetes-agent
spec:
replicas: 1
selector:
matchLabels:
app: gitlab-kubernetes-agent
template:
metadata:
labels:
app: gitlab-kubernetes-agent
spec:
serviceAccountName: gitlab-kubernetes-agent
containers:
- name: agent
# Make sure to specify a matching version for production
image: "registry.gitlab.com/gitlab-org/cluster-integration/gitlab-agent/agentk:vX.Y.Z
args:
- --token-file=/config/token
- --kas-address
- wss://kas.host.tld:443 # replace this line with the line below if using Omnibus GitLab or GitLab.com.
# - wss://gitlab.host.tld:443/-/kubernetes-agent/
# - wss://kas.gitlab.com # for GitLab.com users, use this KAS.
# - grpc://host.docker.internal:8150 # use this attribute when connecting from Docker.
volumeMounts:
- name: token-volume
mountPath: /config
volumes:
- name: token-volume
secret:
secretName: gitlab-kubernetes-agent-token
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 0
maxUnavailable: 1
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: gitlab-kubernetes-agent-write
rules:
- resources:
- '*'
apiGroups:
- '*'
verbs:
- create
- update
- delete
- patch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: gitlab-kubernetes-agent-write-binding
roleRef:
name: gitlab-kubernetes-agent-write
kind: ClusterRole
apiGroup: rbac.authorization.k8s.io
subjects:
- name: gitlab-kubernetes-agent
kind: ServiceAccount
namespace: gitlab-kubernetes-agent
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: gitlab-kubernetes-agent-read
rules:
- resources:
- '*'
apiGroups:
- '*'
verbs:
- get
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: gitlab-kubernetes-agent-read-binding
roleRef:
name: gitlab-kubernetes-agent-read
kind: ClusterRole
apiGroup: rbac.authorization.k8s.io
subjects:
- name: gitlab-kubernetes-agent
kind: ServiceAccount
namespace: gitlab-kubernetes-agent
```
### Create manifest files
In a previous step, you configured a `config.yaml` to point to the GitLab projects
the Agent should synchronize. Agent monitors each of those projects for changes to the manifest files it contains. You can auto-generate manifest files with a
templating engine or other means.
The agent is authorized to download manifests for the configuration
project, and public projects. Support for other private projects is
planned in the issue [Agent authorization for private manifest
projects](https://gitlab.com/gitlab-org/gitlab/-/issues/220912).
Each time you push a change to a monitored manifest repository, the Agent logs the change:
```plaintext
2020-09-15_14:09:04.87946 gitlab-k8s-agent : time="2020-09-15T10:09:04-04:00" level=info msg="Config: new commit" agent_id=1 commit_id=e6a3651f1faa2e928fe6120e254c122451be4eea
```
#### Example manifest file
This file creates a minimal `ConfigMap`:
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: demo-map
namespace: gitlab-kubernetes-agent # Can be any namespace managed by you that the agent has access to.
data:
key: value
```
## Example projects
The following example projects can help you get started with the Kubernetes Agent.
- [Configuration repository](https://gitlab.com/gitlab-org/configure/examples/kubernetes-agent)
- This basic GitOps example deploys NGINX: [Manifest repository](https://gitlab.com/gitlab-org/configure/examples/gitops-project)
## View installed Agents
Users with at least the [Developer](../../../permissions.md) can access the user interface
for the GitLab Kubernetes Agent at **Infrastructure > Kubernetes clusters**, under the
**GitLab Agent managed clusters** tab. This page lists all registered agents for
the current project, and the configuration directory for each agent:
![GitLab Kubernetes Agent list UI](../../img/kubernetes-agent-ui-list_v13_8.png)
Additional management interfaces are planned for the GitLab Kubernetes Agent.
[Provide more feedback in the related epic](https://gitlab.com/groups/gitlab-org/-/epics/4739).
## Upgrades and version compatibility
As the GitLab Kubernetes Agent is a new product, we are constantly adding new features
to it. As a result, while shipped features are production ready, its internal API is
neither stable nor versioned yet. For this reason, GitLab only guarantees compatibility
between corresponding major.minor (X.Y) versions of GitLab and its cluster side
component, `agentk`.
Upgrade your agent installations together with GitLab upgrades. To decide which version of `agentk` to install follow:
1. Open the [`GITLAB_KAS_VERSION`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/GITLAB_KAS_VERSION) file from the GitLab Repository, which contains the latest `agentk` version associated with the `master` branch.
1. Change the `master` branch and select the Git tag associated with your version. For instance, you could change it to GitLab [v13.5.3-ee release](https://gitlab.com/gitlab-org/gitlab/-/blob/v13.5.3-ee/GITLAB_KAS_VERSION)
The available `agentk` and `kas` versions can be found in
[the container registry](https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/container_registry/).
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7