Declarative Setup

Declarative Setup

Argo CD applications, projects and settings can be defined declaratively using Kubernetes manifests. These can be updated using kubectl apply, without needing to touch the argocd command-line tool.

Quick Reference

File Name	Resource Name	Kind	Description
argocd-cm.yaml	argocd-cm	ConfigMap	General Argo CD configuration
argocd-secret.yaml	argocd-secret	Secret	Password, Certificates, Signing Key
argocd-rbac-cm.yaml	argocd-rbac-cm	ConfigMap	RBAC Configuration
argocd-tls-certs-cm.yaml	argocd-tls-certs-cm	ConfigMap	Custom TLS certificates for connecting Git repositories via HTTPS (v1.2 and later)
argocd-ssh-known-hosts-cm.yaml	argocd-ssh-known-hosts-cm	ConfigMap	SSH known hosts data for connecting Git repositories via SSH (v1.2 and later)
application.yaml	-	Application	Example application spec
project.yaml	-	AppProject	Example project spec

All resources, including Application and AppProject specs, have to be installed in the ArgoCD namespace (by default argocd). Also, ConfigMap and Secret resources need to be named as shown in the table above. For Application and AppProject resources, the name of the resource equals the name of the application or project within ArgoCD. This also means that application and project names are unique within the same ArgoCD installation - you cannot i.e. have the same application name for two different applications.

A note about ConfigMap resources

Be sure to annotate your ConfigMap resources using the label app.kubernetes.io/part-of: argocd, otherwise ArgoCD will not be able to use them.

Applications

The Application CRD is the Kubernetes resource object representing a deployed application instance in an environment. It is defined by two key pieces of information:

source reference to the desired state in Git (repository, revision, path, environment)
destination reference to the target cluster and namespace. For the cluster one of server or name can be used, but not both (which will result in an error). Behind the hood when the server is missing, it is being calculated based on the name and then the server is used for any operations.

A minimal Application spec is as follows:

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: guestbook
  namespace: argocd
spec:
  project: default
  source:
    repoURL: https://github.com/argoproj/argocd-example-apps.git
    targetRevision: HEAD
    path: guestbook
  destination:
    server: https://kubernetes.default.svc
    namespace: guestbook

See application.yaml for additional fields. As long as you have completed the first step of Getting Started, you can already apply this with kubectl apply -n argocd -f application.yaml and Argo CD will start deploying the guestbook application.

Note

The namespace must match the namespace of your Argo cd, typically this is argocd.

Note

When creating an application from a Helm repository, the chart attribute must be specified instead of the path attribute within spec.source.

spec:
  source:
    repoURL: https://argoproj.github.io/argo-helm
    chart: argo

Warning

By default, deleting an application will not perform a cascade delete, thereby deleting its resources. You must add the finalizer if you want this behaviour - which you may well not want.

metadata:
  finalizers:
    - resources-finalizer.argocd.argoproj.io

App of Apps

You can create an app that creates other apps, which in turn can create other apps. This allows you to declaratively manage a group of app that can be deployed and configured in concert.

See cluster bootstrapping.

Projects

The AppProject CRD is the Kubernetes resource object representing a logical grouping of applications. It is defined by the following key pieces of information:

sourceRepos reference to the repositories that applications within the project can pull manifests from.
destinations reference to clusters and namespaces that applications within the project can deploy into (don’t use the name field, only server is being matched).
roles list of entities with definitions of their access to resources within the project.

An example spec is as follows:

apiVersion: argoproj.io/v1alpha1
kind: AppProject
metadata:
  name: my-project
  namespace: argocd
  # Finalizer that ensures that project is not deleted until it is not referenced by any application
  finalizers:
    - resources-finalizer.argocd.argoproj.io
spec:
  description: Example Project
  # Allow manifests to deploy from any Git repos
  sourceRepos:
  - '*'
  # Only permit applications to deploy to the guestbook namespace in the same cluster
  destinations:
  - namespace: guestbook
    server: https://kubernetes.default.svc
  # Deny all cluster-scoped resources from being created, except for Namespace
  clusterResourceWhitelist:
  - group: ''
    kind: Namespace
  # Allow all namespaced-scoped resources to be created, except for ResourceQuota, LimitRange, NetworkPolicy
  namespaceResourceBlacklist:
  - group: ''
    kind: ResourceQuota
  - group: ''
    kind: LimitRange
  - group: ''
    kind: NetworkPolicy
  # Deny all namespaced-scoped resources from being created, except for Deployment and StatefulSet
  namespaceResourceWhitelist:
  - group: 'apps'
    kind: Deployment
  - group: 'apps'
    kind: StatefulSet
  roles:
  # A role which provides read-only access to all applications in the project
  - name: read-only
    description: Read-only privileges to my-project
    policies:
    - p, proj:my-project:read-only, applications, get, my-project/*, allow
    groups:
    - my-oidc-group
  # A role which provides sync privileges to only the guestbook-dev application, e.g. to provide
  # sync privileges to a CI system
  - name: ci-role
    description: Sync privileges for guestbook-dev
    policies:
    - p, proj:my-project:ci-role, applications, sync, my-project/guestbook-dev, allow
    # NOTE: JWT tokens can only be generated by the API server and the token is not persisted
    # anywhere by Argo CD. It can be prematurely revoked by removing the entry from this list.
    jwtTokens:
    - iat: 1535390316

Repositories

Note

Some Git hosters - notably GitLab and possibly on-premise GitLab instances as well - require you to specify the .git suffix in the repository URL, otherwise they will send a HTTP 301 redirect to the repository URL suffixed with .git. ArgoCD will not follow these redirects, so you have to adapt your repository URL to be suffixed with .git.

Repository credentials are stored in secret. Use following steps to configure a repo:

Create secret which contains repository credentials. Consider using bitnami-labs/sealed-secrets to store encrypted secret definition as a Kubernetes manifest.
Register repository in the argocd-cm config map. Each repository must have url field and, depending on whether you connect using HTTPS or SSH, usernameSecret and passwordSecret (for HTTPS) or sshPrivateKeySecret (for SSH).

Example for HTTPS:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-cm
  namespace: argocd
  labels:
    app.kubernetes.io/name: argocd-cm
    app.kubernetes.io/part-of: argocd
data:
  repositories: |
    - url: https://github.com/argoproj/my-private-repository
      passwordSecret:
        name: my-secret
        key: password
      usernameSecret:
        name: my-secret
        key: username

Example for SSH:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-cm
  namespace: argocd
  labels:
    app.kubernetes.io/name: argocd-cm
    app.kubernetes.io/part-of: argocd
data:
  repositories: |
    - url: git@github.com:argoproj/my-private-repository
      sshPrivateKeySecret:
        name: my-secret
        key: sshPrivateKey

Tip

The Kubernetes documentation has instructions for creating a secret containing a private key.

Repository Credentials

Earlier than v1.4

If you want to use the same credentials for multiple repositories, you can use repository.credentials:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-cm
  namespace: argocd
  labels:
    app.kubernetes.io/name: argocd-cm
    app.kubernetes.io/part-of: argocd
data:
  repositories: |
    - url: https://github.com/argoproj/private-repo
    - url: https://github.com/argoproj/other-private-repo
  repository.credentials: |
    - url: https://github.com/argoproj
      passwordSecret:
        name: my-secret
        key: password
      usernameSecret:
        name: my-secret
        key: username
    - url: git@github.com:argoproj-labs
      sshPrivateKeySecret:
        name: my-secret
        key: sshPrivateKey

Argo CD will only use the credentials if you omit usernameSecret, passwordSecret, and sshPrivateKeySecret fields (insecureIgnoreHostKey is ignored) or if your repository is not listed in repositories.

A credential may be match if it’s URL is the prefix of the repository’s URL. The means that credentials may match, e.g in the above example both https://github.com/argoproj and https://github.com would match. Argo CD selects the first one that matches.

Tip

Order your credentials with the most specific at the top and the least specific at the bottom.

A complete example.

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-cm
  namespace: argocd
  labels:
    app.kubernetes.io/name: argocd-cm
    app.kubernetes.io/part-of: argocd
data:
  repositories: |
    # this has it's own credentials
    - url: https://github.com/argoproj/private-repo
      passwordSecret:
        name: private-repo-secret
        key: password
      usernameSecret:
        name: private-repo-secret
        key: username
      sshPrivateKeySecret:
        name: private-repo-secret
        key: sshPrivateKey
    - url: https://github.com/argoproj/other-private-repo
    - url: https://github.com/otherproj/another-private-repo
  repository.credentials: |
    # this will be used for the second repo
    - url: https://github.com/argoproj
      passwordSecret:
        name: other-private-repo-secret
        key: password
      usernameSecret:
        name: other-private-repo-secret
        key: username
      sshPrivateKeySecret:
        name: other-private-repo-secret
        key: sshPrivateKey
    # this will be used for the third repo
    - url: https://github.com
      passwordSecret:
        name: another-private-repo-secret
        key: password
      usernameSecret:
        name: another-private-repo-secret
        key: username
      sshPrivateKeySecret:
        name: another-private-repo-secret
        key: sshPrivateKey

v1.4 or later

If you want to use the same credentials for multiple repositories, you can use repository.credentials to configure credential templates. Credential templates can carry the same credentials information as repositories.

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-cm
  namespace: argocd
  labels:
    app.kubernetes.io/name: argocd-cm
    app.kubernetes.io/part-of: argocd
data:
  repositories: |
    - url: https://github.com/argoproj/private-repo
    - url: https://github.com/argoproj/other-private-repo
  repository.credentials: |
    - url: https://github.com/argoproj
      passwordSecret:
        name: my-secret
        key: password
      usernameSecret:
        name: my-secret
        key: username

In the above example, every repository accessed via HTTPS whose URL is prefixed with https://github.com/argoproj would use a username stored in the key username and a password stored in the key password of the secret my-secret for connecting to Git.

In order for ArgoCD to use a credential template for any given repository, the following conditions must be met:

The repository must either not be configured at all, or if configured, must not contain any credential information (i.e. contain none of sshPrivateKeySecret, usernameSecret, passwordSecret )
The URL configured for a credential template (e.g. https://github.com/argoproj) must match as prefix for the repository URL (e.g. https://github.com/argoproj/argocd-example-apps).

Note

Matching credential template URL prefixes is done on a best match effort, so the longest (best) match will take precedence. The order of definition is not important, as opposed to pre v1.4 configuration.

The following keys are valid to refer to credential secrets:

SSH repositories

sshPrivateKeySecret refers to a secret where an SSH private key is stored for accessing the repositories

HTTPS repositories

usernameSecret and passwordSecret refer to secrets where username and/or password are stored for accessing the repositories
tlsClientCertData and tlsClientCertKey refer to secrets where a TLS client certificate (tlsClientCertData) and the corresponding private key tlsClientCertKey are stored for accessing the repositories

Repositories using self-signed TLS certificates (or are signed by custom CA)

v1.2 or later

You can manage the TLS certificates used to verify the authenticity of your repository servers in a ConfigMap object named argocd-tls-certs-cm. The data section should contain a map, with the repository server’s hostname part (not the complete URL) as key, and the certificate(s) in PEM format as data. So, if you connect to a repository with the URL https://server.example.com/repos/my-repo, you should use server.example.com as key. The certificate data should be either the server’s certificate (in case of self-signed certificate) or the certificate of the CA that was used to sign the server’s certificate. You can configure multiple certificates for each server, e.g. if you are having a certificate roll-over planned.

If there are no dedicated certificates configured for a repository server, the system’s default trust store is used for validating the server’s repository. This should be good enough for most (if not all) public Git repository services such as GitLab, GitHub and Bitbucket as well as most privately hosted sites which use certificates from well-known CAs, including Let’s Encrypt certificates.

An example ConfigMap object:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-tls-certs-cm
  namespace: argocd
  labels:
    app.kubernetes.io/name: argocd-cm
    app.kubernetes.io/part-of: argocd
data:
  server.example.com: |
    -----BEGIN CERTIFICATE-----
    MIIF1zCCA7+gAwIBAgIUQdTcSHY2Sxd3Tq/v1eIEZPCNbOowDQYJKoZIhvcNAQEL
    BQAwezELMAkGA1UEBhMCREUxFTATBgNVBAgMDExvd2VyIFNheG9ueTEQMA4GA1UE
    BwwHSGFub3ZlcjEVMBMGA1UECgwMVGVzdGluZyBDb3JwMRIwEAYDVQQLDAlUZXN0
    c3VpdGUxGDAWBgNVBAMMD2Jhci5leGFtcGxlLmNvbTAeFw0xOTA3MDgxMzU2MTda
    Fw0yMDA3MDcxMzU2MTdaMHsxCzAJBgNVBAYTAkRFMRUwEwYDVQQIDAxMb3dlciBT
    YXhvbnkxEDAOBgNVBAcMB0hhbm92ZXIxFTATBgNVBAoMDFRlc3RpbmcgQ29ycDES
    MBAGA1UECwwJVGVzdHN1aXRlMRgwFgYDVQQDDA9iYXIuZXhhbXBsZS5jb20wggIi
    MA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQCv4mHMdVUcafmaSHVpUM0zZWp5
    NFXfboxA4inuOkE8kZlbGSe7wiG9WqLirdr39Ts+WSAFA6oANvbzlu3JrEQ2CHPc
    CNQm6diPREFwcDPFCe/eMawbwkQAPVSHPts0UoRxnpZox5pn69ghncBR+jtvx+/u
    P6HdwW0qqTvfJnfAF1hBJ4oIk2AXiip5kkIznsAh9W6WRy6nTVCeetmIepDOGe0G
    ZJIRn/OfSz7NzKylfDCat2z3EAutyeT/5oXZoWOmGg/8T7pn/pR588GoYYKRQnp+
    YilqCPFX+az09EqqK/iHXnkdZ/Z2fCuU+9M/Zhrnlwlygl3RuVBI6xhm/ZsXtL2E
    Gxa61lNy6pyx5+hSxHEFEJshXLtioRd702VdLKxEOuYSXKeJDs1x9o6cJ75S6hko
    Ml1L4zCU+xEsMcvb1iQ2n7PZdacqhkFRUVVVmJ56th8aYyX7KNX6M9CD+kMpNm6J
    kKC1li/Iy+RI138bAvaFplajMF551kt44dSvIoJIbTr1LigudzWPqk31QaZXV/4u
    kD1n4p/XMc9HYU/was/CmQBFqmIZedTLTtK7clkuFN6wbwzdo1wmUNgnySQuMacO
    gxhHxxzRWxd24uLyk9Px+9U3BfVPaRLiOPaPoC58lyVOykjSgfpgbus7JS69fCq7
    bEH4Jatp/10zkco+UQIDAQABo1MwUTAdBgNVHQ4EFgQUjXH6PHi92y4C4hQpey86
    r6+x1ewwHwYDVR0jBBgwFoAUjXH6PHi92y4C4hQpey86r6+x1ewwDwYDVR0TAQH/
    BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAgEAFE4SdKsX9UsLy+Z0xuHSxhTd0jfn
    Iih5mtzb8CDNO5oTw4z0aMeAvpsUvjJ/XjgxnkiRACXh7K9hsG2r+ageRWGevyvx
    CaRXFbherV1kTnZw4Y9/pgZTYVWs9jlqFOppz5sStkfjsDQ5lmPJGDii/StENAz2
    XmtiPOgfG9Upb0GAJBCuKnrU9bIcT4L20gd2F4Y14ccyjlf8UiUi192IX6yM9OjT
    +TuXwZgqnTOq6piVgr+FTSa24qSvaXb5z/mJDLlk23npecTouLg83TNSn3R6fYQr
    d/Y9eXuUJ8U7/qTh2Ulz071AO9KzPOmleYPTx4Xty4xAtWi1QE5NHW9/Ajlv5OtO
    OnMNWIs7ssDJBsB7VFC8hcwf79jz7kC0xmQqDfw51Xhhk04kla+v+HZcFW2AO9so
    6ZdVHHQnIbJa7yQJKZ+hK49IOoBR6JgdB5kymoplLLiuqZSYTcwSBZ72FYTm3iAr
    jzvt1hxpxVDmXvRnkhRrIRhK4QgJL0jRmirBjDY+PYYd7bdRIjN7WNZLFsgplnS8
    9w6CwG32pRlm0c8kkiQ7FXA6BYCqOsDI8f1VGQv331OpR2Ck+FTv+L7DAmg6l37W
    +LB9LGh4OAp68ImTjqf6ioGKG0RBSznwME+r4nXtT1S/qLR6ASWUS4ViWRhbRlNK
    XWyb96wrUlv+E8I=
    -----END CERTIFICATE-----

Note

The argocd-tls-certs-cm ConfigMap will be mounted as a volume at the mount path /app/config/tls in the pods of argocd-server and argocd-repo-server. It will create files for each data key in the mount path directory, so above example would leave the file /app/config/tls/server.example.com, which contains the certificate data. It might take a while for changes in the ConfigMap to be reflected in your pods, depending on your Kubernetes configuration.

SSH known host public keys

If you are connecting repositories via SSH, ArgoCD will need to know the SSH known hosts public key of the repository servers. You can manage the SSH known hosts data in the ConfigMap named argocd-ssh-known-hosts-cm. This ConfigMap contains a single key/value pair, with ssh_known_hosts as the key and the actual public keys of the SSH servers as data. As opposed to TLS configuration, the public key(s) of each single repository server ArgoCD will connect via SSH must be configured, otherwise the connections to the repository will fail. There is no fallback. The data can be copied from any existing ssh_known_hosts file, or from the output of the ssh-keyscan utility. The basic format is <servername> <keydata>, one entry per line.

An example ConfigMap object:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-ssh-known-hosts-cm
  namespace: argocd
  labels:
    app.kubernetes.io/name: argocd-cm
    app.kubernetes.io/part-of: argocd
data:
  ssh_known_hosts: |
    bitbucket.org ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAubiN81eDcafrgMeLzaFPsw2kNvEcqTKl/VqLat/MaB33pZy0y3rJZtnqwR2qOOvbwKZYKiEO1O6VqNEBxKvJJelCq0dTXWT5pbO2gDXC6h6QDXCaHo6pOHGPUy+YBaGQRGuSusMEASYiWunYN0vCAI8QaXnWMXNMdFP3jHAJH0eDsoiGnLPBlBp4TNm6rYI74nMzgz3B9IikW4WVK+dc8KZJZWYjAuORU3jc1c/NPskD2ASinf8v3xnfXeukU0sJ5N6m5E8VLjObPEO+mN2t/FZTMZLiFqPWc/ALSqnMnnhwrNi2rbfg/rd/IpL8Le3pSBne8+seeFVBoGqzHM9yXw==
    github.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==
    gitlab.com ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBFSMqzJeV9rUzU4kWitGjeR4PWSa29SPqJ1fVkhtj3Hw9xjLVXVYrU9QlYWrOLXBpQ6KWjbjTDTdDkoohFzgbEY=
    gitlab.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAfuCHKVTjquxvt6CM6tdG4SLp1Btn/nOeHHE5UOzRdf
    gitlab.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCsj2bNKTBSpIYDEGk9KxsGh3mySTRgMtXL583qmBpzeQ+jqCMRgBqB98u3z++J1sKlXHWfM9dyhSevkMwSbhoR8XIq/U0tCNyokEi/ueaBMCvbcTHhO7FcwzY92WK4Yt0aGROY5qX2UKSeOvuP4D6TPqKF1onrSzH9bx9XUf2lEdWT/ia1NEKjunUqu1xOB/StKDHMoX4/OKyIzuS0q/T1zOATthvasJFoPrAjkohTyaDUz2LN5JoH839hViyEG82yB+MjcFV5MU3N1l1QL3cVUCh93xSaua1N85qivl+siMkPGbO5xR/En4iEY6K2XPASUEMaieWVNTRCtJ4S8H+9
    ssh.dev.azure.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC7Hr1oTWqNqOlzGJOfGJ4NakVyIzf1rXYd4d7wo6jBlkLvCA4odBlL0mDUyZ0/QUfTTqeu+tm22gOsv+VrVTMk6vwRU75gY/y9ut5Mb3bR5BV58dKXyq9A9UeB5Cakehn5Zgm6x1mKoVyf+FFn26iYqXJRgzIZZcZ5V6hrE0Qg39kZm4az48o0AUbf6Sp4SLdvnuMa2sVNwHBboS7EJkm57XQPVU3/QpyNLHbWDdzwtrlS+ez30S3AdYhLKEOxAG8weOnyrtLJAUen9mTkol8oII1edf7mWWbWVf0nBmly21+nZcmCTISQBtdcyPaEno7fFQMDD26/s0lfKob4Kw8H
    vs-ssh.visualstudio.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC7Hr1oTWqNqOlzGJOfGJ4NakVyIzf1rXYd4d7wo6jBlkLvCA4odBlL0mDUyZ0/QUfTTqeu+tm22gOsv+VrVTMk6vwRU75gY/y9ut5Mb3bR5BV58dKXyq9A9UeB5Cakehn5Zgm6x1mKoVyf+FFn26iYqXJRgzIZZcZ5V6hrE0Qg39kZm4az48o0AUbf6Sp4SLdvnuMa2sVNwHBboS7EJkm57XQPVU3/QpyNLHbWDdzwtrlS+ez30S3AdYhLKEOxAG8weOnyrtLJAUen9mTkol8oII1edf7mWWbWVf0nBmly21+nZcmCTISQBtdcyPaEno7fFQMDD26/s0lfKob4Kw8H

Note

The argocd-ssh-known-hosts-cm ConfigMap will be mounted as a volume at the mount path /app/config/ssh in the pods of argocd-server and argocd-repo-server. It will create a file ssh_known_hosts in that directory, which contains the SSH known hosts data used by ArgoCD for connecting to Git repositories via SSH. It might take a while for changes in the ConfigMap to be reflected in your pods, depending on your Kubernetes configuration.

Clusters

Cluster credentials are stored in secrets same as repository credentials but does not require entry in argocd-cm config map. Each secret must have label argocd.argoproj.io/secret-type: cluster.

The secret data must include following fields:

name - cluster name
server - cluster api server url
namespaces - optional comma-separated list of namespaces which are accessible in that cluster. Cluster level resources would be ignored if namespace list is not empty.
config - JSON representation of following data structure:

# Basic authentication settings
username: string
password: string
# Bearer authentication settings
bearerToken: string
# IAM authentication configuration
awsAuthConfig:
    clusterName: string
    roleARN: string
# Configure external command to supply client credentials
# See https://godoc.org/k8s.io/client-go/tools/clientcmd/api#ExecConfig
execProviderConfig:
    command: string
    args: [
      string
    ]
    env: {
      key: value
    }
    apiVersion: string
    installHint: string
# Transport layer security configuration settings
tlsClientConfig:
    # PEM-encoded bytes (typically read from a client certificate file).
    caData: string
    # PEM-encoded bytes (typically read from a client certificate file).
    certData: string
    # Server should be accessed without verifying the TLS certificate
    insecure: boolean
    # PEM-encoded bytes (typically read from a client certificate key file).
    keyData: string
    # ServerName is passed to the server for SNI and is used in the client to check server
    # certificates against. If ServerName is empty, the hostname used to contact the
    # server is used.
    serverName: string

Note that if you specify a command to run under execProviderConfig, that command must be available in the ArgoCD image. See BYOI (Build Your Own Image).

Cluster secret example:

apiVersion: v1
kind: Secret
metadata:
  name: mycluster-secret
  labels:
    argocd.argoproj.io/secret-type: cluster
type: Opaque
stringData:
  name: mycluster.com
  server: https://mycluster.com
  config: |
    {
      "bearerToken": "<authentication token>",
      "tlsClientConfig": {
        "insecure": false,
        "caData": "<base64 encoded certificate>"
      }
    }

Helm Chart Repositories

Non standard Helm Chart repositories have to be registered under the repositories key in the argocd-cm ConfigMap. Each repository must have url, type and name fields. For private Helm repos you may need to configure access credentials and HTTPS settings using usernameSecret, passwordSecret, caSecret, certSecret and keySecret fields.

Example:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argocd-cm
  namespace: argocd
  labels:
    app.kubernetes.io/name: argocd-cm
    app.kubernetes.io/part-of: argocd
data:
  # v1.2 or earlier use `helm.repositories`
  helm.repositories: |
    - url: https://storage.googleapis.com/istio-prerelease/daily-build/master-latest-daily/charts
      name: istio.io
  # v1.3 or later use `repositories` with `type: helm`
  repositories: |
    - type: helm
      url: https://storage.googleapis.com/istio-prerelease/daily-build/master-latest-daily/charts
      name: istio.io
    - type: helm
      url: https://argoproj.github.io/argo-helm
      name: argo
      usernameSecret:
        name: my-secret
        key: username
      passwordSecret:
        name: my-secret
        key: password
      caSecret:
        name: my-secret
        key: ca
      certSecret:
        name: my-secret
        key: cert
      keySecret:
        name: my-secret
        key: key

Resource Exclusion/Inclusion

Resources can be excluded from discovery and sync so that ArgoCD is unaware of them. For example, events.k8s.io and metrics.k8s.io are always excluded. Use cases:

You have temporal issues and you want to exclude problematic resources.
There are many of a kind of resources that impacts ArgoCD’s performance.
Restrict ArgoCD’s access to certain kinds of resources, e.g. secrets. See security.md#cluster-rbac.

To configure this, edit the argcd-cm config map:

kubectl edit configmap argocd-cm -n argocd

Add resource.exclusions, e.g.:

apiVersion: v1
data:
  resource.exclusions: |
    - apiGroups:
      - "*"
      kinds:
      - "*"
      clusters:
      - https://192.168.0.20
kind: ConfigMap

The resource.exclusions node is a list of objects. Each object can have:

apiGroups A list of globs to match the API group.
kinds A list of kinds to match. Can be “*“ to match all.
cluster A list of globs to match the cluster.

If all three match, then the resource is ignored.

In addition to exclusions, you might configure the list of included resources using the resource.inclusions setting. By default, all resource group/kinds are included. The resource.inclusions setting allows customizing the list of included group/kinds:

apiVersion: v1
data:
  resource.inclusions: |
    - apiGroups:
      - "*"
      kinds:
      - Deployment
      clusters:
      - https://192.168.0.20
kind: ConfigMap

The resource.inclusions and resource.exclusions might be used together. The final list of resources includes group/kinds specified in resource.inclusions minus group/kinds specified in resource.exclusions setting.

Notes:

Quote globs in your YAML to avoid parsing errors.
Invalid globs result in the whole rule being ignored.
If you add a rule that matches existing resources, these will appear in the interface as OutOfSync.

SSO & RBAC

SSO configuration details: SSO
RBAC configuration details: RBAC

Manage Argo CD Using Argo CD

Argo CD is able to manage itself since all settings are represented by Kubernetes manifests. The suggested way is to create Kustomize based application which uses base Argo CD manifests from https://github.com/argoproj/argo-cd and apply required changes on top.

Example of kustomization.yaml:

bases:
- github.com/argoproj/argo-cd//manifests/cluster-install?ref=v1.0.1
# additional resources like ingress rules, cluster and repository secrets.
resources:
- clusters-secrets.yaml
- repos-secrets.yaml
# changes to config maps
patchesStrategicMerge:
- overlays/argo-cd-cm.yaml

The live example of self managed Argo CD config is available at https://cd.apps.argoproj.io and with configuration stored at argoproj/argoproj-deployments.

Note

You will need to sign-in using your github account to get access to https://cd.apps.argoproj.io