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

All resources, including Application and AppProject specs, have to be installed in the Argo CD namespace (by default argocd).

Atomic configuration

For each specific kind of ConfigMap and Secret resource, there is only a single supported resource name (as listed in the above table) - if you need to merge things you need to do it before creating them.

A note about ConfigMap resources

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

Multiple configuration objects

For Application and AppProject resources, the name of the resource equals the name of the application or project within Argo CD. This also means that application and project names are unique within a given Argo CD installation - you cannot have the same application name for two different applications.

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). Under the hood when the server is missing, it is calculated based on the name and 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 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 instance - 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

Without the resources-finalizer.argocd.argoproj.io finalizer, deleting an application will not delete the resources it manages. To perform a cascading delete, you must add the finalizer. See App Deletion.

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 apps 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 the server field is matched).
• roles list of entities with definitions of their access to resources within the project.

Projects which can deploy to the Argo CD namespace grant admin access

If a Project’s destinations configuration allows deploying to the namespace in which Argo CD is installed, then Applications under that project have admin-level access. RBAC access to admin-level Projects should be carefully restricted, and push access to allowed sourceRepos should be limited to only admins.

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. Argo CD will not follow these redirects, so you have to adjust your repository URL to be suffixed with .git.

Repository details are stored in secrets. To configure a repo, create a secret which contains repository details. Consider using bitnami-labs/sealed-secrets to store an encrypted secret definition as a Kubernetes manifest. Each repository must have a url field and, depending on whether you connect using HTTPS, SSH, or GitHub App, username and password (for HTTPS), sshPrivateKey (for SSH), or githubAppPrivateKey (for GitHub App).

Warning

When using bitnami-labs/sealed-secrets the labels will be removed and have to be readded as described here: https://github.com/bitnami-labs/sealed-secrets#sealedsecrets-as-templates-for-secrets

Example for HTTPS:

apiVersion: v1
kind: Secret
metadata:
  name: private-repo
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  type: git
  url: https://github.com/argoproj/private-repo
  password: my-password
  username: my-username

Example for SSH:

apiVersion: v1
kind: Secret
metadata:
  name: private-repo
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  type: git
  url: git@github.com:argoproj/my-private-repository
  sshPrivateKey: |
    -----BEGIN OPENSSH PRIVATE KEY-----
    ...
    -----END OPENSSH PRIVATE KEY-----

Example for GitHub App:

apiVersion: v1
kind: Secret
metadata:
  name: github-repo
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  type: git
  url: https://github.com/argoproj/my-private-repository
  githubAppID: 1
  githubAppInstallationID: 2
  githubAppPrivateKey: |
    -----BEGIN OPENSSH PRIVATE KEY-----
    ...
    -----END OPENSSH PRIVATE KEY-----
---
apiVersion: v1
kind: Secret
metadata:
  name: github-enterprise-repo
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  type: git
  url: https://ghe.example.com/argoproj/my-private-repository
  githubAppID: 1
  githubAppInstallationID: 2
  githubAppEnterpriseBaseUrl: https://ghe.example.com/api/v3
  githubAppPrivateKey: |
    -----BEGIN OPENSSH PRIVATE KEY-----
    ...
    -----END OPENSSH PRIVATE KEY-----

Example for Google Cloud Source repositories:

kind: Secret
metadata:
  name: github-repo
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  type: git
  repo: https://source.developers.google.com/p/my-google-project/r/my-repo
  gcpServiceAccountKey: |
    {
      "type": "service_account",
      "project_id": "my-google-project",
      "private_key_id": "REDACTED",
      "private_key": "-----BEGIN PRIVATE KEY-----\nREDACTED\n-----END PRIVATE KEY-----\n",
      "client_email": "argocd-service-account@my-google-project.iam.gserviceaccount.com",
      "client_id": "REDACTED",
      "auth_uri": "https://accounts.google.com/o/oauth2/auth",
      "token_uri": "https://oauth2.googleapis.com/token",
      "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
      "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/argocd-service-account%40my-google-project.iam.gserviceaccount.com"
    }

Tip

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

Repository Credentials

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

apiVersion: v1
kind: Secret
metadata:
  name: first-repo
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  type: git
  url: https://github.com/argoproj/private-repo
---
apiVersion: v1
kind: Secret
metadata:
  name: second-repo
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  type: git
  url: https://github.com/argoproj/other-private-repo
---
apiVersion: v1
kind: Secret
metadata:
  name: private-repo-creds
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repo-creds
stringData:
  type: git
  url: https://github.com/argoproj
  password: my-password
  username: my-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 private-repo-creds for connecting to Git.

In order for Argo CD 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 sshPrivateKey, username, password )
• 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

• sshPrivateKey refers to the SSH private key for accessing the repositories

HTTPS repositories

• username and password refer to the username and/or password 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

GitHub App repositories

• githubAppPrivateKey refers to the GitHub App private key for accessing the repositories
• githubAppID refers to the GitHub Application ID for the application you created.
• githubAppInstallationID refers to the Installation ID of the GitHub app you created and installed.
• githubAppEnterpriseBaseUrl refers to the base api URL for GitHub Enterprise (e.g. https://ghe.example.com/api/v3)
• tlsClientCertData and tlsClientCertKey refer to secrets where a TLS client certificate (tlsClientCertData) and the corresponding private key tlsClientCertKey are stored for accessing GitHub Enterprise if custom certificates are used.

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

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 configuring repositories to use SSH, Argo CD will need to know their SSH public keys. In order for Argo CD to connect via SSH the public key(s) for each repository server must be pre-configured in Argo CD (unlike TLS configuration), otherwise the connections to the repository will fail.

You can manage the SSH known hosts data in the argocd-ssh-known-hosts-cm ConfigMap. This ConfigMap contains a single entry, ssh_known_hosts, with the public keys of the SSH servers as its value. The value can be filled in from any existing ssh_known_hosts file, or from the output of the ssh-keyscan utility (which is part of OpenSSH’s client package). The basic format is <server_name> <keytype> <base64-encoded_key>, one entry per line.

Here is an example of running ssh-keyscan:

$ for host in bitbucket.org github.com gitlab.com ssh.dev.azure.com vs-ssh.visualstudio.com ; do ssh-keyscan $host 2> /dev/null ; done
bitbucket.org ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQDQeJzhupRu0u0cdegZIa8e86EG2qOCsIsD1Xw0xSeiPDlCr7kq97NLmMbpKTX6Esc30NuoqEEHCuc7yWtwp8dI76EEEB1VqY9QJq6vk+aySyboD5QF61I/1WeTwu+deCbgKMGbUijeXhtfbxSxm6JwGrXrhBdofTsbKRUsrN1WoNgUa8uqN1Vx6WAJw1JHPhglEGGHea6QICwJOAr/6mrui/oB7pkaWKHj3z7d1IC4KWLtY47elvjbaTlkN04Kc/5LFEirorGYVbt15kAUlqGM65pk6ZBxtaO3+30LVlORZkxOh+LKL/BvbZ/iRNhItLqNyieoQj/uh/7Iv4uyH/cV/0b4WDSd3DptigWq84lJubb9t/DnZlrJazxyDCulTmKdOR7vs9gMTo+uoIrPSb8ScTtvw65+odKAlBj59dhnVp9zd7QUojOpXlL62Aw56U4oO+FALuevvMjiWeavKhJqlR7i5n9srYcrNV7ttmDw7kf/97P5zauIhxcjX+xHv4M=
github.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOMqqnkVzrm0SdG6UOoqKLsabgH5C9okWi0dh2l9GKJl
github.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQCj7ndNxQowgcQnjshcLrqPEiiphnt+VTTvDP6mHBL9j1aNUkY4Ue1gvwnGLVlOhGeYrnZaMgRK6+PKCUXaDbC7qtbW8gIkhL7aGCsOr/C56SJMy/BCZfxd1nWzAOxSDPgVsmerOBYfNqltV9/hWCqBywINIR+5dIg6JTJ72pcEpEjcYgXkE2YEFXV1JHnsKgbLWNlhScqb2UmyRkQyytRLtL+38TGxkxCflmO+5Z8CSSNY7GidjMIZ7Q4zMjA2n1nGrlTDkzwDCsw+wqFPGQA179cnfGWOWRVruj16z6XyvxvjJwbz0wQZ75XK5tKSb7FNyeIEs4TT4jk+S4dhPeAUC5y+bDYirYgM4GC7uEnztnZyaVWQ7B381AK4Qdrwt51ZqExKbQpTUNn+EjqoTwvqNj4kqx5QUCI0ThS/YkOxJCXmPUWZbhjpCg56i+2aB6CmK2JGhn57K5mj0MNdBXA4/WnwH6XoPWJzK5Nyu2zB3nAZp+S5hpQs+p1vN1/wsjk=
github.com ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEmKSENjQEezOmxkZMy7opKgwFB9nkt5YRrYMjNuG5N87uRgg6CLrbo5wAdT/y6v0mKV0U2w0WZ2YB/++Tpockg=
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

Here is an example ConfigMap object using the output from ssh-keyscan above:

apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    app.kubernetes.io/name: argocd-ssh-known-hosts-cm
    app.kubernetes.io/part-of: argocd
  name: argocd-ssh-known-hosts-cm
data:
  ssh_known_hosts: |
    # This file was automatically generated by hack/update-ssh-known-hosts.sh. DO NOT EDIT
    [ssh.github.com]:443 ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEmKSENjQEezOmxkZMy7opKgwFB9nkt5YRrYMjNuG5N87uRgg6CLrbo5wAdT/y6v0mKV0U2w0WZ2YB/++Tpockg=
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    bitbucket.org ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIazEu89wgQZ4bqs3d63QSMzYVa0MuJ2e2gKTKqu+UUO
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    github.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOMqqnkVzrm0SdG6UOoqKLsabgH5C9okWi0dh2l9GKJl
    github.com ssh-rsa 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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 Argo CD 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.

Configure repositories with proxy

Proxy for your repository can be specified in the proxy field of the repository secret, along with other repository configurations. Argo CD uses this proxy to access the repository. Argo CD looks for the standard proxy environment variables in the repository server if the custom proxy is absent.

An example repository with proxy:

apiVersion: v1
kind: Secret
metadata:
  name: private-repo
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  type: git
  url: https://github.com/argoproj/private-repo
  proxy: https://proxy-server-url:8888
  password: my-password
  username: my-username

Legacy behaviour

In Argo CD version 2.0 and earlier, repositories where stored as part of the argocd-cm config map. For backward-compatibility, Argo CD will still honor repositories in the config map, but this style of repository configuration is deprecated and support for it will be removed in a future version.

apiVersion: v1
kind: ConfigMap
data:
  repositories: |
    - url: https://github.com/argoproj/my-private-repository
      passwordSecret:
        name: my-secret
        key: password
      usernameSecret:
        name: my-secret
        key: username
  repository.credentials: |
    - url: https://github.com/argoproj
      passwordSecret:
        name: my-secret
        key: password
      usernameSecret:
        name: my-secret
        key: username
---
apiVersion: v1
kind: Secret
metadata:
  name: my-secret
  namespace: argocd
stringData:
  password: my-password
  username: my-username

Clusters

Cluster credentials are stored in secrets same as repositories or repository credentials. 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.
• clusterResources - optional boolean string ("true" or "false") determining whether Argo CD can manage cluster-level resources on this cluster. This setting is used only if the list of managed namespaces is not empty.
• project - optional string to designate this as a project-scoped cluster.
• 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:
    # Base64 encoded PEM-encoded bytes (typically read from a client certificate file).
    caData: string
    # Base64 encoded PEM-encoded bytes (typically read from a client certificate file).
    certData: string
    # Server should be accessed without verifying the TLS certificate
    insecure: boolean
    # Base64 encoded 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 Argo CD 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>"
      }
    }

EKS cluster secret example using argocd-k8s-auth and IRSA:

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: |
    {
      "awsAuthConfig": {
        "clusterName": "my-eks-cluster-name",
        "roleARN": "arn:aws:iam::<AWS_ACCOUNT_ID>:role/<IAM_ROLE_NAME>"
      },
      "tlsClientConfig": {
        "insecure": false,
        "caData": "<base64 encoded certificate>"
      }        
    }

Note that you should have IRSA enabled on your EKS cluster, create an appropriate IAM role which allows it to assume other IAM roles (whichever roleARNs that Argo CD needs to assume) and have an assume role policy which allows the argocd-application-controller and argocd-server pods to assume said role via OIDC.

Example trust relationship config for <arn:aws:iam::<AWS_ACCOUNT_ID>:role/<ARGO_CD_MANAGEMENT_IAM_ROLE_NAME>, which is required for Argo CD to perform actions via IAM. Ensure that the cluster has an IAM OIDC provider configured for it.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "Federated": "arn:aws:iam::<AWS_ACCOUNT_ID>:oidc-provider/oidc.eks.<AWS_REGION>.amazonaws.com/id/EXAMPLED539D4633E53DE1B71EXAMPLE"
            },
            "Action": "sts:AssumeRoleWithWebIdentity",
            "Condition": {
                "StringEquals": {
                    "oidc.eks.<AWS_REGION>.amazonaws.com/id/EXAMPLED539D4633E53DE1B71EXAMPLE:sub": ["system:serviceaccount:argocd:argocd-application-controller", "system:serviceaccount:argocd:argocd-server"],
                    "oidc.eks.<AWS_REGION>.amazonaws.com/id/EXAMPLED539D4633E53DE1B71EXAMPLE:aud": "sts.amazonaws.com"
                }
            }
        }
    ]
}

The Argo CD management role also needs to be allowed to assume other roles, in this case we want it to assume arn:aws:iam::<AWS_ACCOUNT_ID>:role/<IAM_ROLE_NAME> so that it can manage the cluster mapped to that role. This can be extended to allow assumption of multiple roles, either as an explicit array of role ARNs or by using * where appropriate.

{
    "Version" : "2012-10-17",
    "Statement" : {
      "Effect" : "Allow",
      "Action" : "sts:AssumeRole",
      "Principal" : {
        "AWS" : "<arn:aws:iam::<AWS_ACCOUNT_ID>:role/<IAM_ROLE_NAME>"
      }
    }
  }

Example service account configs for argocd-application-controller and argocd-server. Note that once the annotations have been set on the service accounts, both the application controller and server pods need to be restarted.

apiVersion: v1
kind: ServiceAccount
metadata:
  annotations:
    eks.amazonaws.com/role-arn: "<arn:aws:iam::<AWS_ACCOUNT_ID>:role/<ARGO_CD_MANAGEMENT_IAM_ROLE_NAME>"
  name: argocd-application-controller
---
apiVersion: v1
kind: ServiceAccount
metadata:
  annotations:
    eks.amazonaws.com/role-arn: "<arn:aws:iam::<AWS_ACCOUNT_ID>:role/<ARGO_CD_MANAGEMENT_IAM_ROLE_NAME>"
  name: argocd-server

In turn, the roleARN of each managed cluster needs to be added to each respective cluster’s aws-auth config map (see Enabling IAM principal access to your cluster), as well as having an assume role policy which allows it to be assumed by the Argo CD pod role.

Example assume role policy for a cluster which is managed by Argo CD:

{
    "Version" : "2012-10-17",
    "Statement" : {
      "Effect" : "Allow",
      "Action" : "sts:AssumeRole",
      "Principal" : {
        "AWS" : "<arn:aws:iam::<AWS_ACCOUNT_ID>:role/<ARGO_CD_MANAGEMENT_IAM_ROLE_NAME>"
      }
    }
  }

Example kube-system/aws-auth configmap for your cluster managed by Argo CD:

apiVersion: v1
data:
  # Other groups and accounts omitted for brevity. Ensure that no other rolearns and/or groups are inadvertently removed, 
  # or you risk borking access to your cluster.
  #
  # The group name is a RoleBinding which you use to map to a [Cluster]Role. See https://kubernetes.io/docs/reference/access-authn-authz/rbac/#role-binding-examples  
  mapRoles: |
    - "groups":
      - "<GROUP-NAME-IN-K8S-RBAC>"
      "rolearn": "<arn:aws:iam::<AWS_ACCOUNT_ID>:role/<IAM_ROLE_NAME>"
      "username": "<some-username>"

GKE cluster secret example using argocd-k8s-auth and Workload Identity:

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: |
    {
      "execProviderConfig": {
        "command": "argocd-k8s-auth",
        "args": ["gcp"],
        "apiVersion": "client.authentication.k8s.io/v1beta1"
      },
      "tlsClientConfig": {
        "insecure": false,
        "caData": "<base64 encoded certificate>"
      }
    }

Note that you must enable Workload Identity on your GKE cluster, create GCP service account with appropriate IAM role and bind it to Kubernetes service account for argocd-application-controller and argocd-server (showing Pod logs on UI). See Use Workload Identity and Authenticating to the Kubernetes API server.

Helm Chart Repositories

Non standard Helm Chart repositories have to be registered explicitly. Each repository must have url, type and name fields. For private Helm repos you may need to configure access credentials and HTTPS settings using username, password, tlsClientCertData and tlsClientCertKey fields.

Example:

apiVersion: v1
kind: Secret
metadata:
  name: istio
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  name: istio.io
  url: https://storage.googleapis.com/istio-prerelease/daily-build/master-latest-daily/charts
  type: helm
---
apiVersion: v1
kind: Secret
metadata:
  name: argo-helm
  namespace: argocd
  labels:
    argocd.argoproj.io/secret-type: repository
stringData:
  name: argo
  url: https://argoproj.github.io/argo-helm
  type: helm
  username: my-username
  password: my-password
  tlsClientCertData: ...
  tlsClientCertKey: ...

Resource Exclusion/Inclusion

Resources can be excluded from discovery and sync so that Argo CD 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 Argo CD’s performance.
• Restrict Argo CD’s access to certain kinds of resources, e.g. secrets. See security.md#cluster-rbac.

To configure this, edit the argocd-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.
• clusters 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.

Resource Custom Labels

Custom Labels configured with resource.customLabels (comma separated string) will be displayed in the UI (for any resource that defines them).

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:

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