Refactor and revise Protect docs

Moving Container Security docs and adding steps
that explain how to set up Container Security.

doc/topics/web_application_firewall/index.md

 ---
-stage: Protect
-group: Container Security
-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
+redirect_to: '../../user/project/clusters/protect/web_application_firewall/index.md'
 ---
 
+This document was moved to [another location](../../user/project/clusters/protect/web_application_firewall/index.md).
 
-# Web Application Firewall - ModSecurity
-
-A web application firewall (or WAF) filters, monitors, and blocks HTTP traffic to
-and from a web application. By inspecting HTTP traffic, it can prevent attacks
-stemming from web application security flaws. It can be used to detect SQL injection,
-Cross-Site Scripting (XSS), Remote File Inclusion, Security Misconfigurations, and
-much more.
-
-## Overview
-
-GitLab provides a WAF out of the box after Ingress is deployed. All you need to do is deploy your
-application along with a service and Ingress resource. In the GitLab [Ingress](../../user/clusters/applications.md#ingress)
-deployment, the [ModSecurity](https://modsecurity.org/)
-module is loaded into Ingress-NGINX by default and monitors the traffic to the applications
-which have an Ingress. The ModSecurity module runs with the [OWASP Core Rule Set (CRS)](https://coreruleset.org/)
-by default. The OWASP CRS detects and logs a wide range of common attacks.
-
-By default, the WAF is deployed in Detection-only mode and only logs attack attempts.
-
-## Requirements
-
-The Web Application Firewall requires:
-
-- **Kubernetes**
-
-  To enable the WAF, you need:
-
-  - Kubernetes 1.12+.
-  - A load balancer. You can use NGINX-Ingress by deploying it to your
-    Kubernetes cluster by either:
-    - Using the [`nginx-ingress` Helm chart](https://github.com/helm/charts/tree/master/stable/nginx-ingress).
-    - Installing the [Ingress GitLab Managed App](../../user/clusters/applications.md#ingress) with WAF enabled.
-
-- **Configured Kubernetes objects**
-
-  To use the WAF on an application, you need to deploy the following Kubernetes resources:
-
-  - [Deployment](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/)
-  - [Service](https://kubernetes.io/docs/concepts/services-networking/service/)
-  - [Ingress Resource](https://kubernetes.io/docs/concepts/services-networking/ingress/)
-
-## Quick start
-
-If you are using GitLab.com, see the [quick start guide](quick_start_guide.md) for
-how to use the WAF with GitLab.com and a Kubernetes cluster on Google Kubernetes Engine (GKE).
-
-If you are using a self-managed instance of GitLab, you need to configure the
-[Google OAuth2 OmniAuth Provider](../../integration/google.md) before
-you can configure a cluster on GKE. Once this is set up, you can follow the steps on the [quick start guide](quick_start_guide.md) to get started.
-
-NOTE:
-This guide shows how the WAF can be deployed using Auto DevOps. The WAF
-is available by default to all applications no matter how they are deployed,
-as long as they are using Ingress.
-
-## Network firewall vs. Web Application Firewall
-
-A network firewall or packet filter looks at traffic at the Network (L3) and Transport (L4) layers
-of the [OSI Model](https://en.wikipedia.org/wiki/OSI_model), and denies packets from entry based on
-a set of rules regarding the network in general.
-
-A Web Application Firewall operates at the Application (L7) layer of the OSI Model and can
-examine all the packets traveling to and from a specific application. A WAF can set
-more advanced rules around threat detection.
-
-## Features
-
-ModSecurity is enabled with the [OWASP Core Rule Set (CRS)](https://github.com/coreruleset/coreruleset/) by
-default. The OWASP CRS logs attempts to the following attacks:
-
-- [SQL Injection](https://wiki.owasp.org/index.php/OWASP_Periodic_Table_of_Vulnerabilities_-_SQL_Injection)
-- [Cross-Site Scripting](https://wiki.owasp.org/index.php/OWASP_Periodic_Table_of_Vulnerabilities_-_Cross-Site_Scripting_(XSS))
-- [Local File Inclusion](https://wiki.owasp.org/index.php/Testing_for_Local_File_Inclusion)
-- [Remote File Inclusion](https://wiki.owasp.org/index.php/OWASP_Periodic_Table_of_Vulnerabilities_-_Remote_File_Inclusion)
-- [Code Injection](https://wiki.owasp.org/index.php/Code_Injection)
-- [Session Fixation](https://wiki.owasp.org/index.php/Session_fixation)
-- [Scanner Detection](https://wiki.owasp.org/index.php/Category:Vulnerability_Scanning_Tools)
-- [Metadata/Error Leakages](https://wiki.owasp.org/index.php/Improper_Error_Handling)
-
-It is good to have a basic knowledge of the following:
-
-- [Kubernetes](https://kubernetes.io/docs/home/)
-- [Ingress](https://kubernetes.github.io/ingress-nginx/)
-- [ModSecurity](https://www.modsecurity.org/)
-- [OWASP Core Rule Set](https://github.com/coreruleset/coreruleset/)
-
-## Roadmap
-
-You can find more information on the product direction of the WAF in
-[Category Direction - Web Application Firewall](https://about.gitlab.com/direction/protect/web_application_firewall/).
+<!-- This redirect file can be deleted after <2021-04-01>. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/user/clusters/applications.md

@@ -1296,7 +1296,7 @@ To enable WAF, switch its respective toggle to the enabled position when install
 or updating [Ingress application](#ingress).
 
 If this is your first time using the GitLab WAF, we recommend you follow the
-[quick start guide](../../topics/web_application_firewall/quick_start_guide.md).
+[quick start guide](../project/clusters/protect/web_application_firewall/quick_start_guide.md).
 
 There is a small performance overhead by enabling ModSecurity. If this is
 considered significant for your application, you can disable ModSecurity's
@@ -1308,7 +1308,7 @@ rule engine for your deployed application in any of the following ways:
 1. Switch its respective toggle to the disabled position, and then apply changes
    by selecting **Save changes** to reinstall Ingress with the recent changes.
 
-![Disabling WAF](../../topics/web_application_firewall/img/guide_waf_ingress_save_changes_v12_10.png)
+![Disabling WAF](../project/clusters/protect/web_application_firewall/img/guide_waf_ingress_save_changes_v12_10.png)
 
 ##### Logging and blocking modes
 
@@ -1321,7 +1321,7 @@ To help you tune your WAF rules, you can globally set your WAF to either
 To change your WAF's mode:
 
 1. If you haven't already done so,
-   [install ModSecurity](../../topics/web_application_firewall/quick_start_guide.md).
+   [install ModSecurity](../project/clusters/protect/web_application_firewall/quick_start_guide.md).
 1. Navigate to **Operations > Kubernetes**.
 1. In **Applications**, scroll to **Ingress**.
 1. Under **Global default**, select your desired mode.
@@ -1337,12 +1337,12 @@ The **ModSecurity** user interface controls are disabled if the version deployed
 differs from the one available in GitLab. However, actions at the [Ingress](#ingress)
 level, such as uninstalling, can still be performed:
 
-![WAF settings disabled](../../topics/web_application_firewall/img/guide_waf_ingress_disabled_settings_v12_10.png)
+![WAF settings disabled](../project/clusters/protect/web_application_firewall/img/guide_waf_ingress_disabled_settings_v12_10.png)
 
 Update [Ingress](#ingress) to the most recent version to take advantage of bug
 fixes, security fixes, and performance improvements. To update the
 [Ingress application](#ingress), you must first uninstall it, and then re-install
-it as described in [Install ModSecurity](../../topics/web_application_firewall/quick_start_guide.md).
+it as described in [Install ModSecurity](../project/clusters/protect/web_application_firewall/quick_start_guide.md).
 
 ##### Viewing Web Application Firewall traffic
 

doc/user/project/clusters/protect/container_host_security/index.md

+---
+stage: Protect
+group: Container Security
+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/#designated-technical-writers
+---
+
+# Container Host Security
+
+Container Host Security in GitLab provides Intrusion Detection and Prevention capabilities that can
+monitor and (optionally) block activity inside the containers themselves. This is done by leveraging
+an integration with Falco to provide the monitoring capabilities and an integration with Pod
+Security Policies and AppArmor to provide blocking capabilities.
+
+## Overview
+
+Container Host Security can be used to monitor and block activity inside a container as well as to
+enforce security policies across the entire Kubernetes cluster. Falco profiles allow for users to
+define the activity they want to monitor for and detect. Among other things, this can include system
+log entries, process starts, file activity, and network ports opened. AppArmor is used to block any
+undesired activity via AppArmor profiles. These profiles are loaded into the cluster when
+referenced by Pod Security Policies.
+
+By default, Container Host Security is deployed into the cluster in monitor mode only, with no
+default profiles or rules running out-of-the-box. Activity monitoring and blocking begins only when
+users define profiles for these technologies.
+
+## Installation
+
+See the [installation guide](quick_start_guide.md) for the recommended steps to install the
+Container Host Security capabilities. This guide shows the recommended way of installing Container
+Host Security through GMAv2. However, it's also possible to do a manual installation through our
+Helm chart.
+
+## Features
+
+- Prevent containers from starting as root.
+- Limit the privileges and system calls available to containers.
+- Monitor system logs, process starts, files read/written/deleted, and network ports opened.
+- Optionally block processes from starting or files from being read/written/deleted.
+
+## Supported container orchestrators
+
+Kubernetes v1.14+ is the only supported container orchestrator. OpenShift and other container
+orchestrators aren't supported.
+
+## Supported Kubernetes providers
+
+The following cloud providers are supported:
+
+- Amazon EKS
+- Google GKE
+
+Although Container Host Security may function on Azure or self-managed Kubernetes instances, it isn't
+officially tested and supported on those providers.
+
+## Roadmap
+
+See the [Category Direction page](https://about.gitlab.com/direction/protect/container_host_security/)
+for more information on the product direction of Container Host Security.

doc/user/project/clusters/protect/container_host_security/quick_start_guide.md

+---
+stage: Protect
+group: Container Security
+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/#designated-technical-writers
+---
+
+# Getting started with Container Host Security
+
+The following steps are recommended for installing Container Host Security. Although you can install
+some capabilities through GMAv1, we [recommend](#using-gmav1-with-gmav2) that you install
+applications through GMAv2 exclusively when using Container Network Security.
+
+## Installation steps
+
+The following steps are recommended to install and use Container Host Security through GitLab:
+
+1. [Install at least one runner and connect it to GitLab](https://docs.gitlab.com/runner/).
+1. [Create a group](../../../../group/#create-a-new-group).
+1. [Connect a Kubernetes cluster to the group](../../add_remove_clusters.md).
+1. [Create a cluster management project and associate it with the Kubernetes cluster](../../../../clusters/management_project.md).
+
+1. Install and configure an Ingress node:
+
+   - [Install the Ingress node via CI/CD (GMAv2)](../../../../clusters/applications.md#install-ingress-using-gitlab-cicd).
+   - [Determine the external endpoint via the manual method](../../../../clusters/applications.md#determining-the-external-endpoint-manually).
+   - Navigate to the Kubernetes page and enter the [DNS address for the external endpoint](../../index.md#base-domain)
+     into the **Base domain** field on the **Details** tab. Save the changes to the Kubernetes
+     cluster.
+
+1. [Install and configure Falco](../../../../clusters/applications.md#install-falco-using-gitlab-cicd)
+   for activity monitoring.
+1. [Install and configure AppArmor](../../../../clusters/applications.md#install-apparmor-using-gitlab-cicd)
+   for activity blocking.
+1. [Configure Pod Security Policies](../../../../clusters/applications.md#using-podsecuritypolicy-in-your-deployments)
+   (required to be able to load AppArmor profiles).
+
+It's possible to install and manage Falco and AppArmor in other ways, such as installing them
+manually in a Kubernetes cluster and then connecting it back to GitLab. These methods aren't
+supported or documented.
+
+## Viewing the logs
+
+Falco logs can be viewed by running the following command in your Kubernetes cluster:
+
+```shell
+kubectl -n gitlab-managed-apps logs -l app=falco
+```
+
+## Troubleshooting
+
+### Trouble connecting to the cluster
+
+Your CI/CD pipeline may occasionally fail or have trouble connecting to the cluster. Here are some
+initial troubleshooting steps that resolve the most common problems:
+
+1. [Clear the cluster cache](../../index.md#clearing-the-cluster-cache)
+1. If things still aren't working, a more assertive set of actions may help get things back to a
+   good state:
+
+   - Stop and [delete the problematic environment](../../../../../ci/environments/#delete-environments-through-the-ui)
+     in GitLab.
+   - Delete the relevant namespace in Kubernetes by running
+     `kubectl delete namespaces <insert-some-namespace-name>` in your Kubernetes cluster.
+   - Rerun the application project pipeline to redeploy the application.
+
+### Using GMAv1 with GMAv2
+
+When GMAv1 and GMAv2 are used together on the same cluster, users may experience problems with
+applications being uninstalled or removed from the cluster. This is because GMAv2 actively
+uninstalls applications that are installed with GMAv1 and not configured to be installed with GMAv2.
+It's possible to use a mixture of applications installed with GMAv1 and GMAv2 by ensuring that the
+GMAv1 applications are installed **after** the GMAv2 cluster management project pipeline runs. GMAv1
+applications must be reinstalled after each run of that pipeline. This approach isn't recommended as
+it's error-prone and can lead to downtime as applications are uninstalled and later reinstalled.
+When using Container Network Security, the preferred and recommended path is to install all
+necessary components with GMAv2 and the cluster management project.
+
+**Related documentation links:**
+
+- [GitLab Managed Apps v1 (GMAv1)](../../../../clusters/applications.md#install-with-one-click)
+- [GitLab Managed Apps v2 (GMAv2)](../../../../clusters/management_project.md)

doc/user/project/clusters/protect/container_network_security/index.md

+---
+stage: Protect
+group: Container Security
+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/#designated-technical-writers
+---
+
+# Container Network Security
+
+Container Network Security in GitLab provides basic firewall functionality by leveraging Cilium
+NetworkPolicies to filter traffic going in and out of the cluster as well as traffic between pods
+inside the cluster. Container Network Security can be used to enforce L3, L4, and L7 policies and
+can prevent an attacker with control over one pod from spreading laterally to access other pods in
+the same cluster. Both Ingress and Egress rules are supported.
+
+By default, Cilium is deployed in Detection-only mode and only logs attack attempts. GitLab provides
+a set of out-of-the-box policies as examples and to help users get started. These policies are
+disabled by default, as they must usually be customized to match application-specific needs.
+
+## Installation
+
+See the [installation guide](quick_start_guide.md) for the recommended steps to install GitLab
+Container Network Security. This guide shows the recommended way of installing Container Network
+Security through GMAv2. However, it's also possible to install Cilium manually through our Helm
+chart.
+
+## Features
+
+- GitLab managed installation of Cilium.
+- Support for L3, L4, and L7 policies.
+- Ability to export logs to a SIEM.
+- Statistics page showing volume of packets processed and dropped over time (Gold/Ultimate users
+  only).
+- Management of NetworkPolicies through code in a project (Available for auto DevOps users only).
+- Management of CiliumNetworkPolicies through a UI policy manager (Gold/Ultimate users only).
+
+## Supported container orchestrators
+
+Kubernetes v1.14+ is the only supported container orchestrator. OpenShift and other container
+orchestrators aren't supported.
+
+## Supported Kubernetes providers
+
+The following cloud providers are supported:
+
+- Amazon EKS
+- Google GKE
+
+Although Container Network Security may function on Azure or self-managed Kubernetes instances, it
+isn't officially tested and supported on those providers.
+
+## Supported NetworkPolicies
+
+GitLab only supports the use of CiliumNetworkPolicies. Although generic Kubernetes NetworkPolicies
+or other kinds of NetworkPolicies may work, GitLab doesn't test or support them.
+
+## Managing NetworkPolicies through GitLab vs your cloud provider
+
+Some cloud providers offer integrations with Cilium or offer other ways to manage NetworkPolicies in
+Kubernetes. GitLab Container Network Security doesn't support deployments that have NetworkPolicies
+managed by an external provider. By choosing to manage NetworkPolicies through GitLab, you can take
+advantage of the following benefits:
+
+- Support for handling NetworkPolicy infrastructure as code.
+- Full revision history and audit log of all changes made.
+- Ability to revert back to a previous version at any time.
+
+## Roadmap
+
+See the [Category Direction page](https://about.gitlab.com/direction/protect/container_network_security/)
+for more information on the product direction of Container Network Security.

doc/user/project/clusters/protect/container_network_security/quick_start_guide.md

+---
+stage: Protect
+group: Container Security
+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/#designated-technical-writers
+---
+
+# Getting started with Container Network Security
+
+The following steps are recommended for installing Container Network Security. Although you can
+install some capabilities through GMAv1, we [recommend](#using-gmav1-with-gmav2) that you install
+applications through GMAv2 exclusively when using Container Network Security.
+
+## Installation steps
+
+The following steps are recommended to install and use Container Network Security through GitLab:
+
+1. [Install at least one runner and connect it to GitLab](https://docs.gitlab.com/runner/).
+1. [Create a group](../../../../group/#create-a-new-group).
+1. [Connect a Kubernetes cluster to the group](../../add_remove_clusters.md).
+1. [Create a cluster management project and associate it with the Kubernetes cluster](../../../../clusters/management_project.md).
+
+1. Install and configure an Ingress node:
+
+   - [Install the Ingress node via CI/CD (GMAv2)](../../../../clusters/applications.md#install-ingress-using-gitlab-cicd).
+   - [Determine the external endpoint via the manual method](../../../../clusters/applications.md#determining-the-external-endpoint-manually).
+   - Navigate to the Kubernetes page and enter the [DNS address for the external endpoint](../../index.md#base-domain)
+     into the **Base domain** field on the **Details** tab. Save the changes to the Kubernetes
+     cluster.
+
+1. [Install and configure Cilium](../../../../clusters/applications.md#install-cilium-using-gitlab-cicd).
+1. Be sure to restart all pods that were running before Cilium was installed by running this command
+   in your cluster:
+
+   `kubectl get pods --all-namespaces -o custom-columns=NAMESPACE:.metadata.namespace,NAME:.metadata.name,HOSTNETWORK:.spec.hostNetwork --no-headers=true | grep '<none>' | awk '{print "-n "$1" "$2}' | xargs -L 1 -r kubectl delete pod`
+
+It's possible to install and manage Cilium in other ways. For example, you could use the GitLab Helm
+chart to install Cilium manually in a Kubernetes cluster, and then connect it back to GitLab.
+However, such methods aren't documented or officially supported by GitLab.
+
+## Managing Network Policies
+
+Managing NetworkPolicies through GitLab is advantageous over managing the policies in Kubernetes
+directly. Kubernetes doesn't provide a GUI editor, a change control process, or a revision history.
+Network Policies can be managed through GitLab in one of two ways:
+
+- Management through a YAML file in each application's project (for projects using Auto DevOps). For
+  more information, see the [Network Policy documentation](../../../../../topics/autodevops/stages.md#network-policy).
+- Management through the GitLab Policy management UI (for projects not using Auto DevOps). For more
+  information, see the [Container Network Policy documentation](../../../../application_security/threat_monitoring/index.md#container-network-policy-management) (Ultimate/Gold only).
+
+Each method has benefits and drawbacks:
+
+|  | YAML method | UI method (Ultimate/Gold only) |
+|--|:------------|:-------------------------------|
+| **Benefits** | A change control process is possible by requiring [MR Approvals](../../../merge_requests/merge_request_approvals.md). All changes are fully tracked and audited in the same way that Git tracks the history of any file in its repository. | The UI provides a simple rules editor for users who are less familiar with the YAML syntax of NetworkPolicies. This view is a live representation of the policies currently deployed in the Kubernetes cluster. The UI also allows for multiple network policies to be created per environment. |
+| **Drawbacks** | Only one network policy can be deployed per environment (although that policy can be as detailed as needed). Also, if changes were made in Kubernetes directly rather than through the `auto-deploy-values.yaml` file, the YAML file's contents don't represent the actual state of policies deployed in Kubernetes. | Policy changes aren't audited and a change control process isn't available. |
+
+Users are encouraged to choose one of the two methods to manage their policies. If users attempt to
+use both methods simultaneously, when the application project pipeline runs the contents of the
+NetworkPolicy in the `auto-deploy-values.yaml` file may override policies configured in the UI
+editor.
+
+## Monitoring throughput `**(ULTIMATE)**`
+
+To view statistics for Container Network Security, you must follow the installation steps above and
+configure GitLab integration with Prometheus. Also, if you use custom Helm values for Cilium, you
+must enable Hubble with flow metrics for each namespace by adding the following lines to
+your [Cilium values](../../../../clusters/applications.md#install-cilium-using-gitlab-cicd):
+your [Cilium values](../../../../clusters/applications.md#install-cilium-using-gitlab-cicd):
+
+```yaml
+global:
+  hubble:
+    enabled: true
+    metrics:
+      enabled:
+        - 'flow:sourceContext=namespace;destinationContext=namespace'
+```
+
+Additional information about the statistics page is available in the
+[documentation that describes the Threat Management UI](../../../../application_security/threat_monitoring/index.md#container-network-policy).
+
+## Forwarding logs to a SIEM
+
+Cilium logs can be forwarded to a SIEM or an external logging system through syslog protocol by
+installing and configuring Fluentd. Fluentd can be installed through GitLab in two ways:
+
+- The [GMAv1 method](../../../../clusters/applications.md#fluentd)
+- The [GMAv2 method](../../../../clusters/applications.md#install-fluentd-using-gitlab-cicd)
+
+GitLab strongly encourages using only the GMAv2 method to install Fluentd.
+
+## Viewing the logs
+
+Cilium logs can be viewed by running the following command in your Kubernetes cluster:
+
+```shell
+kubectl -n gitlab-managed-apps logs -l k8s-app=cilium -c cilium-monitor
+```
+
+## Troubleshooting
+
+### Traffic is not being blocked as expected
+
+By default, Cilium is installed in Audit mode only, meaning that NetworkPolicies log policy
+violations but don't block any traffic. To set Cilium to Blocking mode, you must add the following
+lines to the `.gitlab/managed-apps/cilium/values.yaml` file in your cluster management project:
+
+```yaml
+config:
+  policyAuditMode: false
+
+agent:
+  monitor:
+    eventTypes: ["drop"]
+```
+
+### Traffic is not being allowed as expected
+
+Keep in mind that when Cilium is set to blocking mode (rather than Audit mode), NetworkPolicies
+operate on an allow-list basis. If one or more NetworkPolicies apply to a node, then all traffic
+that doesn't match at least one Policy is blocked. To resolve, add NetworkPolicies defining the
+traffic that you want to allow in the node.
+
+### Trouble connecting to the cluster
+
+Occasionally, your CI/CD pipeline may fail or have trouble connecting to the cluster. Here are some
+initial troubleshooting steps that resolve the most common problems:
+
+1. [Clear the cluster cache](../../index.md#clearing-the-cluster-cache).
+1. If things still aren't working, a more assertive set of actions may help get things back into a
+   good state:
+
+   - Stop and [delete the problematic environment](../../../../../ci/environments/index.md#delete-environments-through-the-ui) in GitLab.
+   - Delete the relevant namespace in Kubernetes by running `kubectl delete namespaces <insert-some-namespace-name>` in your Kubernetes cluster.
+   - Rerun the application project pipeline to redeploy the application.
+
+### Using GMAv1 with GMAv2
+
+When GMAv1 and GMAv2 are used together on the same cluster, users may experience problems with
+applications being uninstalled or removed from the cluster. This is because GMAv2 actively
+uninstalls applications that are installed with GMAv1 and not configured to be installed with GMAv2.
+It's possible to use a mixture of applications installed with GMAv1 and GMAv2 by ensuring that the
+GMAv1 applications are installed **after** the GMAv2 cluster management project pipeline runs. GMAv1
+applications must be reinstalled after each run of that pipeline. This approach isn't recommended as
+it's error-prone and can lead to downtime as applications are uninstalled and later reinstalled.
+When using Container Network Security, the preferred and recommended path is to install all
+necessary components with GMAv2 and the cluster management project.
+
+**Related documentation links:**
+
+- [GitLab Managed Apps v1 (GMAv1)](../../../../clusters/applications.md#install-with-one-click)
+- [GitLab Managed Apps v2 (GMAv2)](../../../../clusters/management_project.md)

doc/user/project/clusters/protect/index.md

+---
+stage: Protect
+group: Container Security
+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/#designated-technical-writers
+---
+
+# Protecting your deployed applications
+
+GitLab makes it straightforward to protect applications deployed in [connected Kubernetes clusters](index.md).
+These protections are available in the Kubernetes network layer and in the container itself. At
+the network layer, the Container Network Security capabilities in GitLab provide basic firewall
+functionality by leveraging Cilium NetworkPolicies to filter traffic going in and out of the cluster
+and traffic between pods inside the cluster. Inside the container, Container Host Security provides
+Intrusion Detection and Prevention capabilities that can monitor and block activity inside the
+containers themselves.
+
+## Capabilities
+
+The following capabilities are available to protect deployed applications in Kubernetes:
+
+- Web Application Firewall
+  - [Overview](web_application_firewall/index.md)
+  - [Installation guide](web_application_firewall/quick_start_guide.md)
+- Container Network Security
+  - [Overview](container_network_security/index.md)
+  - [Installation guide](container_network_security/quick_start_guide.md)
+- Container Host Security
+  - [Overview](container_host_security/index.md)
+  - [Installation guide](container_host_security/quick_start_guide.md)

doc/user/project/clusters/protect/web_application_firewall/index.md

+---
+stage: Protect
+group: Container Security
+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
+---
+
+# Web Application Firewall
+
+A web application firewall (or WAF) filters, monitors, and blocks HTTP traffic to
+and from a web application. By inspecting HTTP traffic, it can prevent attacks
+stemming from web application security flaws. It can be used to detect SQL injection,
+Cross-Site Scripting (XSS), Remote File Inclusion, Security Misconfigurations, and
+much more.
+
+## Overview
+
+GitLab provides a WAF out of the box after Ingress is deployed. All you need to do is deploy your
+application along with a service and Ingress resource. In the GitLab [Ingress](../../../../clusters/applications.md#ingress)
+deployment, the [ModSecurity](https://modsecurity.org/)
+module is loaded into Ingress-NGINX by default and monitors the traffic to the applications
+which have an Ingress. The ModSecurity module runs with the [OWASP Core Rule Set (CRS)](https://coreruleset.org/)
+by default. The OWASP CRS detects and logs a wide range of common attacks.
+
+By default, the WAF is deployed in Detection-only mode and only logs attack attempts.
+
+## Requirements
+
+The Web Application Firewall requires:
+
+- **Kubernetes**
+
+  To enable the WAF, you need:
+
+  - Kubernetes 1.12+.
+  - A load balancer. You can use NGINX-Ingress by deploying it to your
+    Kubernetes cluster by either:
+    - Using the [`nginx-ingress` Helm chart](https://github.com/helm/charts/tree/master/stable/nginx-ingress).
+    - Installing the [Ingress GitLab Managed App](../../../../clusters/applications.md#ingress) with WAF enabled.
+
+- **Configured Kubernetes objects**
+
+  To use the WAF on an application, you need to deploy the following Kubernetes resources:
+
+  - [Deployment](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/)
+  - [Service](https://kubernetes.io/docs/concepts/services-networking/service/)
+  - [Ingress Resource](https://kubernetes.io/docs/concepts/services-networking/ingress/)
+
+## Quick start
+
+If you are using GitLab.com, see the [quick start guide](quick_start_guide.md) for
+how to use the WAF with GitLab.com and a Kubernetes cluster on Google Kubernetes Engine (GKE).
+
+If you are using a self-managed instance of GitLab, you must configure the
+[Google OAuth2 OmniAuth Provider](../../../../../integration/google.md) before
+you can configure a cluster on GKE. Once this is set up, you can follow the steps on the
+[quick start guide](quick_start_guide.md)
+to get started.
+
+NOTE:
+This guide shows how the WAF can be deployed using Auto DevOps. The WAF
+is available by default to all applications no matter how they are deployed,
+as long as they are using Ingress.
+
+## Network firewall vs. Web Application Firewall
+
+A network firewall or packet filter looks at traffic at the Network (L3) and Transport (L4) layers
+of the [OSI Model](https://en.wikipedia.org/wiki/OSI_model), and denies packets from entry based on
+a set of rules regarding the network in general.
+
+A Web Application Firewall operates at the Application (L7) layer of the OSI Model and can
+examine all the packets traveling to and from a specific application. A WAF can set
+more advanced rules around threat detection.
+
+## Features
+
+ModSecurity is enabled with the [OWASP Core Rule Set (CRS)](https://github.com/coreruleset/coreruleset/) by
+default. The OWASP CRS logs attempts to the following attacks:
+
+- [SQL Injection](https://wiki.owasp.org/index.php/OWASP_Periodic_Table_of_Vulnerabilities_-_SQL_Injection)
+- [Cross-Site Scripting](https://wiki.owasp.org/index.php/OWASP_Periodic_Table_of_Vulnerabilities_-_Cross-Site_Scripting_(XSS))
+- [Local File Inclusion](https://wiki.owasp.org/index.php/Testing_for_Local_File_Inclusion)
+- [Remote File Inclusion](https://wiki.owasp.org/index.php/OWASP_Periodic_Table_of_Vulnerabilities_-_Remote_File_Inclusion)
+- [Code Injection](https://wiki.owasp.org/index.php/Code_Injection)
+- [Session Fixation](https://wiki.owasp.org/index.php/Session_fixation)
+- [Scanner Detection](https://wiki.owasp.org/index.php/Category:Vulnerability_Scanning_Tools)
+- [Metadata/Error Leakages](https://wiki.owasp.org/index.php/Improper_Error_Handling)
+
+It is good to have a basic knowledge of the following:
+
+- [Kubernetes](https://kubernetes.io/docs/home/)
+- [Ingress](https://kubernetes.github.io/ingress-nginx/)
+- [ModSecurity](https://www.modsecurity.org/)
+- [OWASP Core Rule Set](https://github.com/coreruleset/coreruleset/)
+
+## Roadmap
+
+You can find more information on the product direction of the WAF in
+[Category Direction - Web Application Firewall](https://about.gitlab.com/direction/protect/web_application_firewall/).

doc/user/project/clusters/securing.md

 ---
-stage: Protect
-group: Container Security
-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
+redirect_to: 'protect/index.md'
 ---
 
-# Securing your deployed applications
+This document was moved to [another location](protect/index.md).
 
-GitLab makes it easy to secure applications deployed in [connected Kubernetes clusters](index.md).
-You can benefit from the protection of a [Web Application Firewall](../../../topics/web_application_firewall/quick_start_guide.md),
-[Network Policies](../../../topics/autodevops/stages.md#network-policy),
-and [Container Host Security](../../clusters/applications.md#install-falco-using-gitlab-cicd).
-
-This page contains full end-to-end steps and instructions to connect your cluster to GitLab and
-install these features, whether or not your applications are deployed through GitLab CI/CD. If you
-use [Auto DevOps](../../../topics/autodevops/index.md)
-to build and deploy your application with GitLab, see the documentation for the respective
-[GitLab Managed Applications](../../clusters/applications.md)
-above.
-
-## Overview
-
-At a high level, the required steps include the following:
-
-- Connect the cluster to GitLab.
-- Set up one or more runners.
-- Set up a cluster management project.
-- Install a Web Application Firewall, and/or Network Policies, and/or Container Host
-  Security.
-- Install Prometheus to get statistics and metrics in the
-  [threat monitoring](../../application_security/threat_monitoring/)
-  dashboard.
-
-### Requirements
-
-Minimum requirements (depending on the GitLab Manage Application you want to install):
-
-- Your cluster is connected to GitLab (ModSecurity, Cilium, and Falco).
-- At least one runner is installed (Cilium and Falco only).
-
-### Understanding how GitLab Managed Apps are installed
-
-NOTE:
-These diagrams use the term _Kubernetes_ for simplicity. In practice, Sidekiq connects to a Helm
-command runner pod in the cluster.
-
-You install GitLab Managed Apps from the GitLab web interface with a one-click setup process. GitLab
-uses Sidekiq (a background processing service) to facilitate this.
-
-```mermaid
-  sequenceDiagram
-    autonumber
-    GitLab->>+Sidekiq: Install a GitLab Managed App
-    Sidekiq->>+Kubernetes: Helm install
-    Kubernetes-->>-Sidekiq: Installation complete
-    Sidekiq-->>-GitLab: Refresh UI
-```
-
-Although this installation method is easier because it's a point-and-click action in the user
-interface, it's inflexible and harder to debug. If something goes wrong, you can't see the
-deployment logs. The Web Application Firewall feature uses this installation method.
-
-However, the next generation of GitLab Managed Apps V2 ([CI/CD-based GitLab Managed Apps](https://gitlab.com/groups/gitlab-org/-/epics/2103))
-don't use Sidekiq to deploy. All the applications are deployed using a GitLab CI/CD pipeline and
-therefore, by runners.
-
-```mermaid
-sequenceDiagram
-  autonumber
-  GitLab->>+GitLab: Trigger pipeline
-  GitLab->>+Runner: Run deployment job
-  Runner->>+Kubernetes: Helm install
-  Kubernetes-->>-Runner: Installation is complete
-  Runner-->>-GitLab: Report job status and update pipeline
-```
-
-Debugging is easier because you have access to the raw logs of these jobs (the Helm Tiller output is
-available as an artifact in case of failure), and the flexibility is much better. Since these
-deployments are only triggered when a pipeline is running (most likely when there's a new commit in
-the cluster management repository), every action has a paper trail and follows the classic merge
-request workflow (approvals, merge, deploy). The Network Policy (Cilium) Managed App, and Container
-Host Security (Falco) are deployed with this model.
-
-## Connect the cluster to GitLab
-
-To deploy GitLab Managed Apps to your cluster, you must first
-[add your cluster](add_remove_clusters.md)
-to GitLab. Then [install](../../clusters/applications.md#install-with-one-click)
-the Web Application Firewall from the project or group Kubernetes page.
-
-Note that your project doesn't have to be hosted or deployed through GitLab. You can manage a
-cluster independent of the applications that use the cluster.
-
-## Set up a runner
-
-To install CI/CD-based GitLab Managed Apps, a pipeline using a runner must be running in
-GitLab. You can [install a runner](../../clusters/applications.md#gitlab-runner)
-in the Kubernetes cluster added in the previous step, or use one of the shared runners provided by
-GitLab if you're using GitLab.com.
-
-With your cluster connected to GitLab and a runner in place, you can proceed to the next
-steps and start installing the Cilium and Falco GitLab Managed Apps to secure your applications
-hosted on this cluster.
-
-## Create a Cluster Management Project
-
-A [Cluster Management Project](../../clusters/management_project.md)
-is a GitLab project that contains a `.gitlab-ci.yml` file to deploy GitLab Managed Apps to your
-cluster. This project runs the required charts with the Kubernetes
-[`cluster-admin`](https://kubernetes.io/docs/reference/access-authn-authz/rbac/#user-facing-roles)
-privileges.
-
-The creation of this project starts like any other GitLab project. Use an empty
-project and add a `gitlab-ci.yml` file at the root, containing this template:
-
-```yaml
-include:
-  - template: Managed-Cluster-Applications.gitlab-ci.yml
-```
-
-To make this project a Cluster Management Project, follow these
-[instructions](../../clusters/management_project.md#selecting-a-cluster-management-project).
-This project can be designated as such even if your application isn't hosted on GitLab. In this
-case, create a new empty project where you can select your newly created Cluster Management Project.
-
-## Install GitLab Container Network Policy
-
-GitLab Container Network Policy is based on [Cilium](https://cilium.io/). To
-install the Cilium GitLab Managed App, add a
-`.gitlab/managed-apps/config.yaml` file to your Cluster Management project:
-
-```yaml
-# possible values are gke, eks or you can leave it blank
-clusterType: gke
-
-cilium:
-  installed: true
-```
-
-Your application doesn't have to be managed or deployed by GitLab to leverage this feature.
-[Read more](../../clusters/applications.md#install-cilium-using-gitlab-cicd)
-about configuring Container Network Policy.
-
-## Install GitLab Container Host Security
-
-Similarly, you can install Container Host Security, based on
-[Falco](https://falco.org/), in your `.gitlab/managed-apps/config.yaml`:
-
-```yaml
-falco:
-  installed: true
-```
-
-[Read more](../../clusters/applications.md#install-falco-using-gitlab-cicd)
-about configuring Container Host Security.
+<!-- This redirect file can be deleted after <2021-04-01>. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->