PowerDNS from UBITech

UBITech took on PowerDNS as their challenge and provided
descriptors for both Helm and Juju

Signed-off-by: Mark Beierl <mark.beierl@canonical.com>

Hackfest_Demos/OSM-11/PowerDNS/helm-cnf/README.md

+# K8s-At-Home PowerDNS NS
+
+Descriptors that installs a PowerDNS chart from K8s-At-Home repo.
+
+There is one VNF (powerdns\_vnf) with only one KDU.
+
+There is one NS that connects the VNF to a mgmt network
+
+## Onboarding and instantiation
+
+```bash
+osm nfpkg-create powerdns_knf.tar.gz
+osm nspkg-create powerdns_ns.tar.gz
+osm ns-create --ns_name powerdns --nsd_name powerdns_ns --vim_account <VIM_ACCOUNT_NAME>|<VIM_ACCOUNT_ID> --ssh_keys ${HOME}/.ssh/id_rsa.pub
+```
+
+### Instantiation option
+
+Some parameters could be passed during the instantiation.
+
+```bash
+osm ns-create --ns_name powerdns --nsd_name powerdns_ns --vim_account <VIM_ACCOUNT_NAME>|<VIM_ACCOUNT_ID> --config '{additionalParamsForVnf: [{"member-vnf-index": "openldap", "additionalParams": {"replicaCount": "2"}}]}'
+osm ns-create --ns_name powerdns --nsd_name powerdns_ns --vim_account <VIM_ACCOUNT_NAME>|<VIM_ACCOUNT_ID> --config_file params.yaml
+```
+
+## Test deployment
+
+```bash
+helm -n <PROJECT_ID> list
+kubectl -n <PROJECT_ID> get all
+kubectl -n <PROJECT_ID> get service
+```
+
+## Testing PowerDNS server
+
+```bash
+PROJECT_ID="$(osm project-list | grep "_43" | awk '{ print $4 }')"
+UDP_NODE_PORT="$(k -n "${PROJECT_ID}" get svc | grep udp | awk '{ print $5 }' | sed 's#53\:\([0-9]*\)/UDP#\1#g')"
+dig @<NODE_IP> -p "${UDP_NODE_PORT}" google.com
+```

Hackfest_Demos/OSM-11/PowerDNS/helm-cnf/powerdns_knf/powerdns_vnfd.yaml

+vnfd:
+  description: KNF with single KDU using a helm-chart for PowerDNS
+  df:
+  - id: default-df
+  ext-cpd:
+  - id: mgmt-ext
+    k8s-cluster-net: mgmtnet
+  id: powerdns_knf
+  k8s-cluster:
+    nets:
+    - id: mgmtnet
+  kdu:
+  - name: powerdns
+    helm-chart: k8s-at-home/powerdns
+  mgmt-cp: mgmt-ext
+  product-name: powerdns_knf
+  provider: UBITECH Ltd.
+  version: '1.0'

Hackfest_Demos/OSM-11/PowerDNS/helm-cnf/powerdns_ns/params/params.yaml

+vld:
+- name: mgmtnet
+  vim-network-name: osm-ext
+additionalParamsForVnf:
+- member-vnf-index: powerdns
+  additionalParamsForKdu:
+  - kdu_name: powerdns
+    additionalParams:
+      # replicaCount: 2  
+      # service.loadBalancerIP: '172.21.251.X' # MetalLB IP Address
+      # service.type: NodePort
+      service:
+        type: NodePort
+        # loadBalancerIP: '172.21.251.X' # MetalLB IP Address
+      env:
+        TZ: "Europe/Athens"

Hackfest_Demos/OSM-11/PowerDNS/helm-cnf/powerdns_ns/powerdns_nsd.yaml

+nsd:
+  nsd:
+  - description: NS consisting of a single KNF powerdns_knf connected to mgmt network
+    designer: OSM
+    df:
+    - id: default-df
+      vnf-profile:
+      - id: powerdns
+        virtual-link-connectivity:
+        - constituent-cpd-id:
+          - constituent-base-element-id: powerdns
+            constituent-cpd-id: mgmt-ext
+          virtual-link-profile-id: mgmtnet
+        vnfd-id: powerdns_knf
+    id: powerdns_ns
+    name: powerdns_ns
+    version: '1.0'
+    virtual-link-desc:
+    - id: mgmtnet
+      mgmt-network: 'true'
+    vnfd-id:
+    - powerdns_knf

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/Dockerfile

+FROM psitrax/powerdns:4.4.1
+
+LABEL maintainer=vnapostolop@gmail.com
+
+RUN apk add --update python3 py3-pip
\ No newline at end of file

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/README.md

+# Juju bundle for PowerDNS
+
+Developed for the purposes of `OSM-Hackfest-11` by Christos Aslanoglou,
+Vasileios Nikolaos Apostolopoulos and Georgios Katsikas.
+
+This Juju bundle uses a PowerDNS image from `vapostolopoulos/powerdns` 
+dockerhub repo. It is basically `psitrax/powerdns:4.4.1` image with python3
+and py3-pip installed.
+
+# Day 1-2 OSM primitives
+See `initial-config-primitive` in `powerdns_vnfd.yaml` for details.
+```
+add-zone
+add-domain
+
+delete-zone
+delete-domain
+```
+
+# Build the charm 
+```
+cd path/to/hackfest-11/juju-cnf/powerdns_cnf/juju-bundles
+./build-charm.sh
+```
+
+# Deploy bundle to OSM
+```
+cd path/to/hackfest-11/juju-cnf
+./deploy-ns.sh your-vim-name
+```
+
+# Test deployment
+```
+$ K8S_NAMESPACE=$(osm ns-show powerdns-cnf-ns --literal | grep kdu-instance | awk '{ print $2 }')
+$ LOADBALANCER_IP=$(kubectl -n ${K8S_NAMESPACE} get svc powerdns -o json | jq ".status.loadBalancer.ingress[0].ip" -r)
+$ dig @${LOADBALANCER_IP} +tcp test.example.org
+; <<>> DiG 9.11.3-1ubuntu1.15-Ubuntu <<>> @172.16.0.21 +tcp test.example.org
+; (1 server found)
+;; global options: +cmd
+;; Got answer:
+;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25399
+;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
+;; WARNING: recursion requested but not available
+
+;; OPT PSEUDOSECTION:
+; EDNS: version: 0, flags:; udp: 1232
+;; QUESTION SECTION:
+;test.example.org.		IN	A
+
+;; ANSWER SECTION:
+test.example.org.	86400	IN	A	192.0.5.4  ;; <--- You should this IP 
+
+;; Query time: 2 msec
+;; SERVER: 172.16.0.21#53(172.16.0.21)
+;; WHEN: Thu Jun 17 13:58:03 UTC 2021
+;; MSG SIZE  rcvd: 61
+
+```
\ No newline at end of file

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/deploy-ns.sh

+#!/usr/bin/env bash
+set -o errexit
+set -o nounset
+#set -o xtrace
+
+if [ $# -ne 1 ]; then
+    echo "Usage: $0 <vim>"
+    echo "Declare your VIM name (can be retrieved by 'osm vim-list')"
+    exit 1
+fi
+
+VIM=$1
+
+osm nfpkg-create ./powerdns_cnf
+osm nspkg-create ./powerdns_cnf_ns/
+osm ns-create \
+  --ns_name powerdns-cnf-ns \
+  --nsd_name powerdns_cnf_ns \
+  --vim_account "${VIM}" \
+  --config '{vld: [ {name: mgmtnet, vim-network-name: osm-ext} ] }'

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/build-charm.sh

+#!/usr/bin/env bash
+set -o errexit
+set -o nounset
+#set -o xtrace
+
+if [ ! -x "$(command -v charmcraft)" ]; then
+  echo >&2 "You must have the charmcraft command to use this script."
+  exit 1
+fi
+
+pushd .
+rm -rf ./charms/powerdns-operator
+cd ./ops/powerdns-operator
+charmcraft build -v
+mkdir -p ../../charms
+mv build ../../charms/powerdns-operator
+popd
+
+echo "Done"
+

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/bundle.yaml

+description: PowerDNS Bundle
+bundle: kubernetes
+applications:
+  powerdns:
+    charm: ./charms/powerdns-operator
+    scale: 1
+  mariadb-k8s:
+    charm: cs:~charmed-osm/mariadb-k8s
+    scale: 1
+    options:
+      user: youruser
+      password: yourpass
+      database: yourdatabase
+      root_password: yourootpassword
+      mysql_port: "3306"
+
+# Source: https://discourse.charmhub.io/t/bundle-reference/1158
+#
+# relations:
+#
+# States the relations to add between applications. Each relation consists of a
+# pair of lines, where one line begins with two dashes and the other begins
+# with a single dash. Each side of a relation (each line) has the format
+# '<application>:<endpoint>', where 'application' must also be represented
+# under the 'applications' element. Including the endpoint is not strictly
+# necessary as it might be determined automatically. However, it is best
+# practice to do so.
+#
+relations:
+- - mariadb-k8s:mysql
+  - powerdns:db
+
+  

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/.flake8

+[flake8]
+max-line-length = 99
+select: E,W,F,C,N
+exclude:
+  venv
+  .git
+  build
+  dist
+  *.egg_info

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/.gitignore

+venv/
+build/
+*.charm
+
+.coverage
+__pycache__/
+*.py[cod]

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/.jujuignore

+/venv
+*.py[cod]
+*.charm

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/LICENSE

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Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/README.md

+# PowerDNS
+
+## Overview
+
+This is a Kubernetes Charm to deploy [PowerDNS](https://www.powerdns.com/).
+
+Available actions for this charm:
+* Create DNS zones  
+  `juju run-action powerdns/0 add-zone zone-name=example.org.`
+* Add DNS address record (Domain-IP mapping)  
+  `juju run-action powerdns/0 add-domain zone-name=example.org. subdomain=test. ip=192.168.1.254`
+* Delete DNS zones  
+  `juju run-action powerdns/0 delete-zone zone-name=example.org.`
+* Delete a domain-IP mapping  
+  `juju run-action powerdns/0 delete-domain zone-name=example.org. subdomain=test.`
+
+## Setup Juju & MicroK8s
+
+If you don't have MicroK8s and Juju installed executing the following commands:
+
+```bash
+sudo snap install juju --classic
+sudo snap install microk8s --classic
+juju bootstrap microk8s
+```
+
+# Building & deploying
+
+```bash
+git clone https://gitlab.ubitech.eu/nsit/nfv/osm/hackfest-11-powerdns.git
+cd hackfest-11-powerdns/juju-cnf/powerdns_cnf/juju-bundles
+./build-charm.sh
+
+juju add-model powerdns
+juju deploy --verbose /path/to/bundle.yaml
+```

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/actions.yaml

+# Copyright 2021 UBITECH Ltd.
+# See LICENSE file for licensing details.
+add-zone:
+    description: "Creates a zone"
+    params:
+        zone-name:
+            description: "The DNS Zone to be created"
+            type: string
+            default: ""
+delete-zone:
+    description: "Deletes a zone, all attached metadata and rrsets"
+    params:
+        zone-name:
+            description: "The DNS Zone to be deleted"
+            type: string
+            default: ""
+add-domain:
+    description: "Add a subdomain to an existing zone"
+    params:
+        zone-name:
+            description: "The DNS Zone of the domain to be added"
+            type: string
+            default: ""
+        subdomain:
+            description: "The DNS subdomain to be created"
+            type: string
+            default: ""
+        ip:
+            description: "The IP of the subdomain"
+            type: string
+            default: ""
+delete-domain:
+    description: "Delete a domain from a zone"
+    params:
+        zone-name:
+            description: "The DNS Zone of the domain to be deleted"
+            type: string
+            default: ""
+        subdomain:
+            description: "The DNS subdomain to be deleted"
+            type: string
+            default: ""
\ No newline at end of file

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/config.yaml

+# Copyright 2021 UBITECH Ltd.
+# See LICENSE file for licensing details.
+options: {}

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/metadata.yaml

+# Copyright 2021 UBITECH Ltd.
+# See LICENSE file for licensing details.
+name: powerdns
+description: |
+  Kubernetes operator for PowerDNS
+summary: |
+  PowerDNS is a DNS server program, written in C++ and licensed under the GPL.
+  It runs on most Unix derivatives. PowerDNS features a large number of different
+  backends ranging from simple BIND style zonefiles to relational databases and
+  load balancing/failover algorithms.
+
+series:
+  - kubernetes
+
+deployment:
+  type: stateless
+  service: loadbalancer
+
+requires:
+  db:
+    interface: mysql
+    limit: 1

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/requirements-dev.txt

+-r requirements.txt
+black
+coverage
+flake8

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/requirements.txt

+cryptography
+ops==1.1.0
+requests
+git+https://github.com/charmed-osm/ops-lib-charmed-osm/@master

Hackfest_Demos/OSM-11/PowerDNS/juju-cnf/powerdns_cnf/juju-bundles/ops/powerdns-operator/src/charm.py

+#!/usr/bin/env python3
+# Copyright 2021 UBITECH Ltd.
+# See LICENSE file for licensing details.
+#
+# Learn more at: https://juju.is/docs/sdk
+
+"""Charm the service.
+
+Refer to the following post for a quick-start guide that will help you
+develop a new k8s charm using the Operator Framework:
+
+    https://discourse.charmhub.io/t/4208
+"""
+import json
+import logging
+
+from ops.charm import CharmBase
+from ops.main import main
+from ops.model import ActiveStatus, BlockedStatus
+from opslib.osm.interfaces.mysql import MysqlClient
+import requests
+
+logger = logging.getLogger(__name__)
+
+
+class PowerDNSCharm(CharmBase):
+    """Charm the service."""
+
+    log: logging.Logger = None
+
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.log = logging.getLogger("powerdns")
+
+        self.powerdns_api_key = "changeme"
+        self.headers = {"X-API-Key": self.powerdns_api_key}
+        self.url = "http://localhost:8081/api/v1/servers/localhost/zones"
+
+        self.mysql_client = MysqlClient(self, "db")
+        self.framework.observe(self.on["db"].relation_changed, self.configure_pod)
+        self.framework.observe(self.on["db"].relation_broken, self.configure_pod)
+
+        self.framework.observe(self.on["add_zone"].action, self._on_add_zone_action)
+        self.framework.observe(
+            self.on["delete_zone"].action, self._on_delete_zone_action
+        )
+        self.framework.observe(self.on["add_domain"].action, self._on_add_domain_action)
+        self.framework.observe(
+            self.on["delete_domain"].action, self._on_delete_domain_action
+        )
+
+        self.framework.observe(self.on.config_changed, self.configure_pod)
+        self.framework.observe(self.on.leader_elected, self.configure_pod)
+
+    def _on_add_zone_action(self, event):
+        zone = event.params["zone-name"]
+
+        self.log.info("Running add-zone action...")
+
+        payload = {
+            "name": zone,
+            "kind": "Native",
+            "masters": [],
+            "nameservers": ["ns1.example.org."],
+        }
+
+        r = requests.post(self.url, data=json.dumps(payload), headers=self.headers)
+        if r.status_code != 201:
+            self.log.info(r.status_code, r.text)
+        else:
+            self.log.info("Added zone {zone}")
+
+    def _on_delete_zone_action(self, event):
+        zone = event.params["zone-name"]
+
+        self.log.info("Running delete-zone action...")
+
+        r = requests.delete(self.url + "/" + zone, headers=self.headers)
+        if r.status_code != 204:
+            self.log.info(r.status_code, r.text)
+        else:
+            self.log.info(f"Deleted zone {zone}")
+
+    def _on_add_domain_action(self, event):
+        zone = event.params["zone-name"]
+        domain = event.params["subdomain"]
+        ip = event.params["ip"]
+
+        self.log.info("Running add-domain action...")
+
+        payload = {
+            "rrsets": [
+                {
+                    "name": domain + zone,
+                    "type": "A",
+                    "ttl": 86400,
+                    "changetype": "REPLACE",
+                    "records": [{"content": ip}],
+                }
+            ]
+        }
+
+        r = requests.patch(
+            self.url + "/" + zone, data=json.dumps(payload), headers=self.headers
+        )
+        if r.status_code != 204:
+            self.log.info(r.status_code, r.text)
+        else:
+            self.log.info(f"Added record of {domain}{zone} in {ip}")
+
+    def _on_delete_domain_action(self, event):
+        zone = event.params["zone-name"]
+        domain = event.params["subdomain"]
+
+        self.log.info("Running delete-domain action...")
+
+        payload = {
+            "rrsets": [{"name": domain + zone, "type": "A", "changetype": "DELETE"}]
+        }
+
+        r = requests.patch(
+            self.url + "/" + zone, data=json.dumps(payload), headers=self.headers
+        )
+        if r.status_code != 204:
+            self.log.info(r.status_code, r.text)
+        else:
+            self.log.info(f"Deleted record of {domain} in zone {zone}")
+
+    def configure_pod(self, _):
+        if self.mysql_client.is_missing_data_in_unit():
+            self.unit.status = BlockedStatus("missing mysql relation")
+            return
+
+        mysql_host = self.mysql_client.host
+        mysql_port = self.mysql_client.port
+        mysql_root_password = self.mysql_client.root_password
+        mysql_root_username = "root"
+        mysql_database = self.mysql_client.database
+
+        self.model.pod.set_spec(
+            {
+                "version": 3,
+                "containers": [
+                    {
+                        "name": "powerdns",
+                        "image": "vapostolopoulos/powerdns:latest",
+                        "ports": [
+                            {
+                                "name": "powerdns-tcp",
+                                "containerPort": 53,
+                                "protocol": "TCP",
+                            },
+                            {
+                                "name": "powerdns-api",
+                                "containerPort": 8081,
+                                "protocol": "TCP",
+                            },
+                        ],
+                        "kubernetes": {
+                            "readinessProbe": {
+                                "httpGet": {
+                                    "path": "/api/v1/servers",
+                                    "port": "powerdns-api",
+                                    "httpHeaders": [
+                                        {
+                                            "name": "X-API-Key",
+                                            "value": self.powerdns_api_key,
+                                        }
+                                    ],
+                                }
+                            }
+                        },
+                        "envConfig": {
+                            "MYSQL_HOST": mysql_host,
+                            "MYSQL_PORT": mysql_port,
+                            "MYSQL_USER": mysql_root_username,
+                            "MYSQL_PASS": mysql_root_password,
+                            "MYSQL_DB": mysql_database,
+                        },
+                        "args": [
+                            "--cache-ttl=120",
+                            "--allow-axfr-ips=127.0.0.1,123.1.2.3",
+                            "--webserver-address=0.0.0.0",
+                            "--webserver-allow-from=0.0.0.0/0,::/0",
+                            "--api=yes",
+                            "--api-key=" + self.powerdns_api_key,
+                        ],
+                    }
+                ],
+            }
+        )
+        self.unit.status = ActiveStatus()
+
+
+if __name__ == "__main__":
+    main(PowerDNSCharm)