Capitalize Kubernetes object names.
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README.md
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README.md
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# postgres operator prototype (WIP)
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Postgres operator manages Postgres clusters in Kubernetes using the [operator pattern](https://coreos.com/blog/introducing-operators.html)
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During the initial run it registers the [third-party-resource (TPR)](https://kubernetes.io/docs/user-guide/thirdpartyresources/) for Postgres.
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The Postgres TPR is essentially a schema that describes the contents of the manifests for deploying individual clusters.
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During the initial run it registers the [Third Party Resource (TPR)](https://kubernetes.io/docs/user-guide/thirdpartyresources/) for Postgres.
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The Postgres TPR is essentially the schema that describes the contents of the manifests for deploying individual Postgres clusters.
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Once the operator is running, it performs the following actions:
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@ -12,11 +12,11 @@ Once the operator is running, it performs the following actions:
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* acts on an update to the operator definition itself and changes the running clusters when necessary (i.e. when the docker image inside the operator definition has been updated.)
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* periodically checks running clusters against the manifests and acts on the differences found.
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For instance, when the user creates a new custom object of type postgresql by submitting a new manifest with kubectl, the operator fetches that object and creates the corresponding kubernetes structures (statefulsets, services, secrets) according to its definition.
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For instance, when the user creates a new custom object of type postgresql by submitting a new manifest with kubectl, the operator fetches that object and creates the corresponding kubernetes structures (StatefulSets, Services, Secrets) according to its definition.
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Another example is changing the docker image inside the operator. In this case, the operator first goes to all statefulsets
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it manages and updates them with the new docker images; afterwards, all pods from each statefulset are killed one by one
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(rolling upgrade) and the replacements are spawned automatically by the statefulsets with the new docker image.
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Another example is changing the docker image inside the operator. In this case, the operator first goes to all Statefulsets
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it manages and updates them with the new docker images; afterwards, all pods from each Statefulset are killed one by one
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(rolling upgrade) and the replacements are spawned automatically by each Statefulset with the new docker image.
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## Setting up Go.
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@ -24,7 +24,7 @@ Postgres operator is written in Go. Use the [installation instructions](https://
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You won't be able to compile the operator with Go older than 1.7. We recommend installing [the latest one](https://golang.org/dl/).
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Go projects expect their source code and all the dependencies to be located under the [GOPATH](https://github.com/golang/go/wiki/GOPATH).
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Normally, one would use a single GOPATH, by creating a directory (i.e. ~/go) and placing the source code under the ~/go/src subdirectories.
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Normally, one would create a directory for the GOPATH (i.e. ~/go) and place the source code under the ~/go/src subdirectories.
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Given the schema above, the postgres operator source code located at `github.bus.zalan.do/acid/postgres-operator` should be put at
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`~/go/src/github.bus.zalan.do/acid/postgres-operator`.
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@ -84,8 +84,8 @@ Note: if you use multiple kubernetes clusters, you can switch to minikube with `
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Before the operator is deployed, you need to tell your minikube cluster the OAuth2 secret token in order to communicate
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with the teams API. For a Live Zalando cluster, the token is populated in a secret described by `manifests/platform-credentials.yaml`
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via the infrastructure created by the Teapot team. The operator expects that secret (with the name set by the `oauth_token_secret_name
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with the teams API. For a Live Zalando cluster, the token is populated in a Secret described by `manifests/platform-credentials.yaml`
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via the infrastructure created by the Teapot team. The operator expects that Secret (with the name set by the `oauth_token_secret_name
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variable to be present). That token is not present in minikube, but one can copy it from the production cluster:
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$ zkubectl --context kube_db_zalan_do get secret postgresql-operator -o yaml| kubectl --context minikube create -f -
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@ -105,7 +105,7 @@ will get you the docker image built and deployed.
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$ sed -e "s/\(image\:.*\:\).*$/\1$TAG/" -e "/serviceAccountName/d" manifests/postgres-operator.yaml|kubectl create -f -
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The last line changes the docker image tag in the manifest to the one the operator image has been built with and removes
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the serviceAccountName definition, as the service account is not defined in minikube (neither it should, as one has admin
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the serviceAccountName definition, as the ServiceAccount is not defined in minikube (neither it should, as one has admin
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permissions there).
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### Deploy etcd
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