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Docs/reference (#323)
Document operator command-line options and environment variables.
This commit is contained in:
Oleksii Kliukin
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zerg-junior
zerg-junior
parent
b518a31d0c
commit
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Individual postgres clusters are described by the Kubernetes *cluster manifest*
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that has the structure defined by the `postgres CRD` (custom resource
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definition). The following section describes the structure of the manifest and
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the purpose of individual keys. You can take a look at the examples of the
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[minimal](https://github.com/zalando-incubator/postgres-operator/blob/master/manifests/minimal-postgres-manifest.yaml)
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and the
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[complete](https://github.com/zalando-incubator/postgres-operator/blob/master/manifests/complete-postgres-manifest.yaml)
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cluster manifests.
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When Kubernetes resources, such as memory, CPU or volumes, are configured,
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their amount is usually described as a string together with the units of
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measurements. Please, refer to the [Kubernetes
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documentation](https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/)
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for the possible values of those.
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## Manifest structure
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A postgres manifest is a `YAML` document. On the top level both individual
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parameters and parameter groups can be defined. Parameter names are written
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in camelCase.
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## Cluster metadata
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Those parameters are grouped under the `metadata` top-level key.
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* **name**
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the name of the cluster. Must start with the `teamId` followed by a dash.
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Changing it after the cluster creation is not supported. Required field.
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* **namespace**
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the namespace where the operator creates Kubernetes objects (i.e. pods,
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services, secrets) for the cluster. Changing it after the cluster creation
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results in deploying or updating a completely separate cluster in the target
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namespace. Optional (if present, should match the namespace where the
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manifest is applied).
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## Top-level parameters
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Those are parameters grouped directly under the `spec` key in the manifest.
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* **teamId**
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name of the team the cluster belongs to. Changing it after the cluster
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creation is not supported. Required field.
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* **dockerImage**
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custom docker image that overrides the **docker_image** operator parameter.
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It should be a [Spilo](https://github.com/zalando/spilo) image. Optional.
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* **enableMasterLoadBalancer**
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boolean flag to override the operator defaults (set by the
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`enable_master_load_balancer` parameter) to define whether to enable the load
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balancer pointing to the postgres primary. Optional.
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* **enableReplicaLoadBalancer**
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boolean flag to override the operator defaults (set by the
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`enable_replica_load_balancer` parameter) to define whether to enable the
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load balancer pointing to the postgres standby instances. Optional.
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* **allowedSourceRanges**
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when one or more load balancers are enabled for the cluster, this parameter
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defines the comma-separated range of IP networks (in CIDR-notation). The
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corresponding load balancer is accessible only to the networks defined by
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this parameter. Optional, when empty the load balancer service becomes
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inaccessible from outside of the Kubernetes cluster.
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* **numberOfInstances**
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total number of instances for a given cluster. The operator parameters
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`max_instances` and `min_instances` may also adjust this number. Required
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field.
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* **users**
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a map of usernames to user flags for the users that should be created in the
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cluster by the operator. User flags are a list, allowed elements are
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`SUPERUSER` `REPLICATION` `INHERIT`, `LOGIN`, `NOLOGIN`, `CREATEROLE`,
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`CREATEDB`, `BYPASSURL`. A login user is created by default unless NOLOGIN is
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specified, in which case the operator creates a role. One can specify empty
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flags by providing a JSON empty array '*[]*'. Optional.
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* **databases**
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a map of database names to database owners for the databases that should be
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created by the operator. The owner users should already exist on the cluster
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(i.e. mentioned in the `user` parameter). Optional.
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* **tolerations**
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a list of tolerations that apply to the cluster pods. Each element of that
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list is a dictionary with the following fields: `key`, `operator`, `value`,
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`effect` and `tolerationSeconds`. Each field is optional. See [Kubernetes
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examples](https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/)
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for details on tolerations and possible values of those keys. When set, this
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value overrides the `pod_toleration` setting from the operator. Optional.
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## Postgres parameters
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Those parameters are grouped under the `postgresql` top-level key.
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* **version**
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the postgres major version of the cluster. Looks at the [Spilo
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project](https://github.com/zalando/spilo/releases) for the list of supported
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versions. Changing the cluster version once the cluster has been bootstrapped
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is not supported. Required field.
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* **parameters**
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a dictionary of postgres parameter names and values to apply to the resulting
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cluster. Optional (Spilo automatically sets reasonable defaults for
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parameters like work_mem or max_connections).
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## Patroni parameters
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Those parameters are grouped under the `patroni` top-level key. See the [patroni
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documentation](https://patroni.readthedocs.io/en/latest/SETTINGS.html) for the
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explanation of `ttl` and `loop_wait` parameters.
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* **initdb**
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a map of key-value pairs describing initdb parameters. For `data-checksum`,
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`debug`, `no-locale`, `noclean`, `nosync` and `sync-only` parameters use
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`true` as the value if you want to set them. Changes to this option do not
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affect the already initialized clusters. Optional.
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* **pg_hba**
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list of custom `pg_hba` lines to replace default ones. Note that the default
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ones include
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```
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hostsll all +pamrole all pam
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```
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, where pamrole is the name of the role for the pam authentication; any
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custom `pg_hba` should include the pam line to avoid breaking pam
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authentication. Optional.
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* **ttl**
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patroni `ttl` parameter value, optional. The default is set by the Spilo
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docker image. Optional.
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* **loop_wait**
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patroni `loop_wait` parameter value, optional. The default is set by the
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Spilo docker image. Optional.
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* **retry_timeout**
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patroni `retry_timeout` parameter value, optional. The default is set by the
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Spilo docker image. Optional.
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* **maximum_lag_on_failover**
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patroni `maximum_lag_on_failover` parameter value, optional. The default is
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set by the Spilo docker image. Optional.
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## Postgres container resources
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Those parameters define [CPU and memory requests and
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limits](https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/)
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for the postgres container. They are grouped under the `resources` top-level
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key. There are two subgroups, `requests` and `limits`.
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### Requests
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CPU and memory requests for the postgres container.
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* **cpu**
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CPU requests for the postgres container. Optional, overrides the
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`default_cpu_requests` operator configuration parameter. Optional.
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* **memory**
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memory requests for the postgres container. Optional, overrides the
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`default_memory_request` operator configuration parameter. Optional.
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#### Limits
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CPU and memory limits for the postgres container.
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* **cpu**
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CPU limits for the postgres container. Optional, overrides the
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`default_cpu_limits` operator configuration parameter. Optional.
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* **memory**
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memory limits for the postgres container. Optional, overrides the
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`default_memory_limits` operator configuration parameter. Optional.
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## Parameters defining how to clone the cluster from another one
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Those parameters are applied when the cluster should be a clone of another one
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that is either already running or has a basebackup on S3. They are grouped
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under the `clone` top-level key and do not affect the already running cluster.
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* **cluster**
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name of the cluster to clone from. Translated to either the service name or
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the key inside the S3 bucket containing base backups. Required when the
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`clone` section is present.
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* **uid**
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Kubernetes UID of the cluster to clone from. Since cluster name is not a
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unique identifier of the cluster (as identically named clusters may exist in
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different namespaces) , the operator uses UID in the S3 bucket name in order
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to guarantee uniqueness. Has no effect when cloning from the running
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clusters. Optional.
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* **timestamp**
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the timestamp up to which the recovery should proceed. The operator always
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configures non-inclusive recovery target, stopping right before the given
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timestamp. When this parameter is set the operator will not consider cloning
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from the live cluster, even if it is running, and instead goes to S3. Optional.
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### EBS volume resizing
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Those parameters are grouped under the `volume` top-level key and define the
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properties of the persistent storage that stores postgres data.
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* **size**
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the size of the target EBS volume. Usual Kubernetes size modifiers, i.e. `Gi`
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or `Mi`, apply. Required.
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* **storageClass**
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the name of the Kubernetes storage class to draw the persistent volume from.
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See [Kubernetes
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documentation](https://kubernetes.io/docs/concepts/storage/storage-classes/)
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for the details on storage classes. Optional.
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@@ -0,0 +1,50 @@
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## Command-line options
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The following command-line options are supported for the operator:
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* **-kubeconfig**
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the path to the kubeconfig file. Usually named config, it contains
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authorization information as well as the URL of the Kubernetes master.
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* **-outofcluster**
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run the operator on a client machine, as opposed to a within the cluster.
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When running in this mode, the operator cannot connect to databases inside
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the cluster, as well as call URLs of in-cluster objects (i.e. teams api
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server). Mostly useful for debugging, it also requires setting the
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`OPERATOR_NAMESPACE` environment variable for the operator own namespace.
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* **-nodatabaseaccess**
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disable database access from the operator. Equivalent to the
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`enable_database_access` set to off and can be overridden by the
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aforementioned operator configuration option.
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* **-noteamsapi**
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disable access to the teams API. Equivalent to the `enable_teams_api` set to
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off can can be overridden by the aforementioned operator configuration
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option.
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In addition to that, standard [glog
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flags](https://godoc.org/github.com/golang/glog) are also supported. For
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instance, one may want to add `-alsologtostderr` and `-v=8` to debug the
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operator REST calls.
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## Environment variables
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The following environment variables are accepted by the operator:
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* **CONFIG_MAP_NAME**
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name of the config map where the operator should look for its configuration.
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Must be present.
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* **OPERATOR_NAMESPACE**
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name of the namespace the operator runs it. Overrides autodetection by the
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operator itself.
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* **WATCHED_NAMESPACE**
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the name of the namespace the operator watches. Special '*' character denotes
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all namespaces. Empty value defaults to the operator namespace. Overrides the
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`watched_namespace` operator parameter.
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* **SCALYR_API_KEY**
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the value of the Scalyr API key to supply to the pods. Overrides the
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`scalyr_api_key` operator parameter.
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@@ -0,0 +1,301 @@
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Postgres operator is configured via a ConfigMap defined by the
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`CONFIG_MAP_NAME` environment variable. Variable names are underscore-separated
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words.
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## General
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* **etcd_host**
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Etcd connection string for Patroni defined as `host:port`. Not required when
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Patroni native Kubernetes support is used. The default is empty (use
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Kubernetes-native DCS).
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* **docker_image**
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Spilo docker image for postgres instances. For production, don't rely on the
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default image, as it might be not the most up-to-date one. Instead, build
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your own Spilo image from the [github
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repository](https://github.com/zalando/spilo).
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* **workers**
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number of working routines the operator spawns to process requests to
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create/update/delete/sync clusters concurrently. The default is `4`.
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* **max_instances**
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operator will cap the number of instances in any managed postgres cluster up
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to the value of this parameter. When `-1` is specified, no limits are applied.
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The default is `-1`.
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* **min_instances**
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operator will run at least the number of instances for any given postgres
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cluster equal to the value of this parameter. When `-1` is specified, no limits
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are applied. The default is `-1`.
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* **resync_period**
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period between consecutive sync requests. The default is `5m`.
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## Postgres users
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* **super_username**
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postgres `superuser` name to be created by `initdb`. The default is
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`postgres`.
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* **replication_username**
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postgres username used for replication between instances. The default is
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`standby`.
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## Kubernetes resources
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* **pod_service_account_name**
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service account used by Patroni running on individual Pods to communicate
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with the operator. Required even if native Kubernetes support in Patroni is
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not used, because Patroni keeps pod labels in sync with the instance role.
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The default is `operator`.
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* **pod_service_account_definition**
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The operator tries to create the pod Service Account in the namespace that
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doesn't define such an account using the YAML definition provided by this
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option. If not defined, a simple definition that contains only the name will
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be used. The default is empty.
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* **pod_terminate_grace_period**
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Patroni pods are [terminated
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forcefully](https://kubernetes.io/docs/concepts/workloads/pods/pod/#termination-of-pods)
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after this timeout. The default is `5m`.
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* **watched_namespace**
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The operator watches for postgres objects in the given namespace. If not
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specified, the value is taken from the operator namespace. A special `*`
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value makes it watch all namespaces. The default is empty (watch the operator pod
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namespace).
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* **pdb_name_format**
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defines the template for PDB (Pod Disruption Budget) names created by the
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operator. The default is `postgres-{cluster}-pdb`, where `{cluster}` is
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replaced by the cluster name. Only the `{cluster}` placeholders is allowed in
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the template.
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* **secret_name_template**
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a template for the name of the database user secrets generated by the
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operator. `{username}` is replaced with name of the secret, `{cluster}` with
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the name of the cluster, `{tprkind}` with the kind of CRD (formerly known as
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TPR) and `{tprgroup}` with the group of the CRD. No other placeholders are
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allowed. The default is
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`{username}.{cluster}.credentials.{tprkind}.{tprgroup}`.
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* **oauth_token_secret_name**
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a name of the secret containing the `OAuth2` token to pass to the teams API.
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The default is `postgresql-operator`.
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* **infrastructure_roles_secret_name**
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name of the secret containing infrastructure roles names and passwords.
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* **pod_role_label**
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name of the label assigned to the postgres pods (and services/endpoints) by
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the operator. The default is `spilo-role`.
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* **cluster_labels**
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list of `name:value` pairs for additional labels assigned to the cluster
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objects. The default is `application:spilo`.
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* **cluster_name_label**
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name of the label assigned to Kubernetes objects created by the operator that
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indicates which cluster a given object belongs to. The default is
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`cluster-name`.
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* **node_readiness_label**
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a set of labels that a running and active node should possess to be
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considered `ready`. The operator uses values of those labels to detect the
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start of the Kubernetes cluster upgrade procedure and move master pods off
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the nodes to be decommissioned. When the set is not empty, the operator also
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assigns the `Affinity` clause to the postgres pods to be scheduled only on
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`ready` nodes. The default is empty.
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* **toleration**
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a dictionary that should contain `key`, `operator`, `value` and
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`effect` keys. In that case, the operator defines a pod toleration
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according to the values of those keys. See [kubernetes
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documentation](https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/)
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for details on taints and tolerations. The default is empty.
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* **pod_environment_configmap**
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a name of the ConfigMap with environment variables to populate on every pod.
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Right now this ConfigMap is searched in the namespace of the postgres cluster.
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All variables from that ConfigMap are injected to the pod's environment, on
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conflicts they are overridden by the environment variables generated by the
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operator. The default is empty.
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## Kubernetes resource requests
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* **default_cpu_request**
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CPU request value for the postgres containers, unless overridden by
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cluster-specific settings. The default is `100m`.
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* **default_memory_request**
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memory request value for the postgres containers, unless overridden by
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cluster-specific settings. The default is `100Mi`.
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* **default_cpu_limit**
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CPU limits for the postgres containers, unless overridden by cluster-specific
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settings. The default is `3`.
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* **default_memory_limit**
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memory limits for the postgres containers, unless overridden by cluster-specific
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settings. The default is `1Gi`.
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## Operator timeouts
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* **resource_check_interval**
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interval to wait between consecutive attempts to check for the presence of
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some Kubernetes resource (i.e. `StatefulSet` or `PodDisruptionBudget`). The
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default is `3s`.
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* **resource_check_timeout**
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timeout when waiting for the presence of a certain Kubernetes resource (i.e.
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`StatefulSet` or `PodDisruptionBudget`) before declaring the operation
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unsuccessful. The default is `10m`.
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* **pod_label_wait_timeout**
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timeout when waiting for the pod role and cluster labels. Bigger value gives
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Patroni more time to start the instance; smaller makes the operator detect
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possible issues faster. The default is `10m`.
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* **pod_deletion_wait_timeout**
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timeout when waiting for the pods to be deleted when removing the cluster or
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recreating pods. The default is `10m`.
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* **ready_wait_interval**
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the interval between consecutive attempts waiting for the postgres CRD to be
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created. The default is `5s`.
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* **ready_wait_timeout**
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the timeout for the complete postgres CRD creation. The default is `30s`.
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## Load balancer related options
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* **db_hosted_zone**
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DNS zone for the cluster DNS name when the load balancer is configured for
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the cluster. Only used when combined with
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[external-dns](https://github.com/kubernetes-incubator/external-dns) and with
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the cluster that has the load balancer enabled. The default is
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`db.example.com`.
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* **enable_master_load_balancer**
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toggles service type load balancer pointing to the master pod of the cluster.
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Can be overridden by individual cluster settings. The default is `true`.
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* **enable_replica_load_balancer**
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toggles service type load balancer pointing to the replica pod of the
|
||||
cluster. Can be overridden by individual cluster settings. The default is
|
||||
`false`.
|
||||
|
||||
* **master_dns_name_format** defines the DNS name string template for the
|
||||
master load balancer cluster. The default is
|
||||
`{cluster}.{team}.{hostedzone}`, where `{cluster}` is replaced by the cluster
|
||||
name, `{team}` is replaced with the team name and `{hostedzone}` is replaced
|
||||
with the hosted zone (the value of the `db_hosted_zone` parameter). No other
|
||||
placeholders are allowed.
|
||||
|
||||
** **replica_dns_name_format** defines the DNS name string template for the
|
||||
replica load balancer cluster. The default is
|
||||
`{cluster}-repl.{team}.{hostedzone}`, where `{cluster}` is replaced by the
|
||||
cluster name, `{team}` is replaced with the team name and `{hostedzone}` is
|
||||
replaced with the hosted zone (the value of the `db_hosted_zone` parameter).
|
||||
No other placeholders are allowed.
|
||||
|
||||
## AWS or GSC interaction
|
||||
* **wal_s3_bucket**
|
||||
S3 bucket to use for shipping WAL segments with WAL-E. A bucket has to be
|
||||
present and accessible by Patroni managed pods. At the moment, supported
|
||||
services by Spilo are S3 and GCS. The default is empty.
|
||||
|
||||
* **log_s3_bucket**
|
||||
S3 bucket to use for shipping postgres daily logs. Works only with S3 on AWS.
|
||||
The bucket has to be present and accessible by Patroni managed pods. At the
|
||||
moment Spilo does not yet support this. The default is empty.
|
||||
|
||||
* **kube_iam_role**
|
||||
AWS IAM role to supply in the `iam.amazonaws.com/role` annotation of Patroni
|
||||
pods. Only used when combined with
|
||||
[kube2iam](https://github.com/jtblin/kube2iam) project on AWS. The default is empty.
|
||||
|
||||
## Debugging the operator
|
||||
* **debug_logging**
|
||||
boolean parameter that toggles verbose debug logs from the operator. The
|
||||
default is `true`.
|
||||
|
||||
* **enable_db_access**
|
||||
boolean parameter that toggles the functionality of the operator that require
|
||||
access to the postgres database, i.e. creating databases and users. The default
|
||||
is `true`.
|
||||
|
||||
### Automatic creation of human users in the database
|
||||
* **enable_teams_api**
|
||||
boolean parameter that toggles usage of the Teams API by the operator.
|
||||
The default is `true`.
|
||||
|
||||
* **teams_api_url**
|
||||
contains the URL of the Teams API service. There is a [demo
|
||||
implementation](https://github.com/ikitiki/fake-teams-api). The default is
|
||||
`https://teams.example.com/api/`.
|
||||
|
||||
* **team_api_role_configuration**
|
||||
postgres parameters to apply to each team member role. The default is
|
||||
'*log_statement:all*'. It is possible to supply multiple options, separating
|
||||
them by commas. Options containing commas within the value are not supported,
|
||||
with the exception of the `search_path`. For instance:
|
||||
|
||||
```yaml
|
||||
teams_api_role_configuration: "log_statement:all,search_path:'data,public'"
|
||||
```
|
||||
The default is `"log_statement:all"`
|
||||
|
||||
* **enable_team_superuser**
|
||||
whether to grant superuser to team members created from the Teams API.
|
||||
The default is `false`.
|
||||
|
||||
* **team_admin_role**
|
||||
role name to grant to team members created from the Teams API. The default is
|
||||
`admin`, that role is created by Spilo as a `NOLOGIN` role.
|
||||
|
||||
* **pam_role_name**
|
||||
when set, the operator will add all team member roles to this group and add a
|
||||
`pg_hba` line to authenticate members of that role via `pam`. The default is
|
||||
`zalandos`.
|
||||
|
||||
* **pam_configuration**
|
||||
when set, should contain a URL to use for authentication against the username
|
||||
and the token supplied as the password. Used in conjunction with
|
||||
[pam_oauth2](https://github.com/CyberDem0n/pam-oauth2) module. The default is
|
||||
`https://info.example.com/oauth2/tokeninfo?access_token= uid
|
||||
realm=/employees`.
|
||||
|
||||
* **protected_roles**
|
||||
List of roles that cannot be overwritten by an application, team or
|
||||
infrastructure role. The default is `admin`.
|
||||
|
||||
## Logging and REST API
|
||||
* **api_port**
|
||||
REST API listener listens to this port. The default is `8080`.
|
||||
|
||||
* **ring_log_lines**
|
||||
number of lines in the ring buffer used to store cluster logs. The default is `100`.
|
||||
|
||||
* **cluster_history_entries**
|
||||
number of entries in the cluster history ring buffer. The default is `1000`.
|
||||
|
||||
## Scalyr options
|
||||
* **scalyr_api_key**
|
||||
API key for the Scalyr sidecar. The default is empty.
|
||||
|
||||
* **scalyr_image**
|
||||
Docker image for the Scalyr sidecar. The default is empty.
|
||||
|
||||
* **scalyr_server_url**
|
||||
server URL for the Scalyr sidecar. The default is `https://upload.eu.scalyr.com`.
|
||||
|
||||
* **scalyr_cpu_request**
|
||||
CPU request value for the Scalyr sidecar. The default is `100m`.
|
||||
|
||||
* **scalyr_memory_request**
|
||||
Memory request value for the Scalyr sidecar. The default is `50Mi`.
|
||||
|
||||
* **scalyr_cpu_limit**
|
||||
CPU limit value for the Scalyr sidecar. The default is `1`.
|
||||
|
||||
* **scalyr_memory_limit**
|
||||
Memory limit value for the Scalyr sidecar. The default is `1Gi`.
|
||||
|
||||
Reference in New Issue
Block a user