Supermaster support, multiple slaves on the same mysql server (#32)

* better supermaster handling, support for multiple slaves on the same db server

* minor style fix

* requested changes

* replaced cut with awk

* manifests

* newlines

* clarification for axfr

examples/kubernetes/README.MD

@@ -0,0 +1,39 @@
+# PDNS example for Kubernetes
+
+## Files
+ - master-daemonset.yaml : Daemonset for PDNS supermaster
+ - slave-daemonset.yaml : Daemonset for PDNS slaves
+ - admin-dashboard.yaml : Deployment for PDNS-Admin Web Dashboard
+ - mariadb.yaml : Example Mysql Deployment
+ 
+## Example setup
+
+This example deploys a supermaster and two slaves on the host network, so pdns can be reached from external networks. Access to the admin-dashboard has to be configured separately with ingress. The admin-dashboard uses a kubernetes clusterip service to use the supermaster-api. Supermaster, slaves and dashboard use the same MariaDB example deployment with different databases (not recommended for production environments).
+For signed AXFR you have to manually deploy TSIG Keys to you supermaster and slaves (https://doc.powerdns.com/authoritative/tsig.html).
+
+## Requirements
+
+### Node Labels
+The Daemonsets use node-role labels as nodeSelector:
+
+    kubectl label node node1 node-role.kubernetes.io/pdns-master=true
+    kubectl label node node2 node-role.kubernetes.io/pdns-slave=true
+    kubectl label node node3 node-role.kubernetes.io/pdns-slave=true
+
+Any other node labels will also work.
+
+### Service Names
+Service names in the pdns namespace **must not** start with 'pdns' or they will break the pdns.conf environment templating.
+
+### Pod-CIDR
+Replace "10.244.0.0/16" in the manifests with your cluster's pod-cidr.
+
+### Node IPs
+Replace IPs and hostnames in the daemonset environments with your own node IPs and domains.
+
+Used in this example: 
+| component | host | ip |
+|--|--|--|
+| supermaster | ns1.example.com | 10.0.0.1 |
+| slave1 | ns2.example.com | 10.0.0.2 |
+| slave2 | ns3.example.com | 10.0.0.3 |

examples/kubernetes/admin-dashboard.yaml

@@ -0,0 +1,122 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app.kubernetes.io/name: pdns-admin
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: admin
+  name: pdns-admin
+spec:
+  replicas: 1
+  selector:
+   matchLabels:
+    app.kubernetes.io/name: pdns-admin
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: admin
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: pdns-admin
+        app.kubernetes.io/part-of: pdns
+        app.kubernetes.io/component: admin
+    spec:
+      hostAliases:
+      - ip: "127.0.0.1"
+        hostnames:
+        - "pdns-admin-uwsgi"
+      containers:
+      - name: pdns-admin-static
+        image: pschiffe/pdns-admin-static:ngoduykhanh
+        imagePullPolicy: IfNotPresent
+        ports:
+        - containerPort: 80
+          protocol: TCP
+        resources:
+          limits:
+            cpu: 300m
+            memory: 128Mi
+          requests:
+            cpu: 50m
+            memory: 64Mi
+      - name: pdns-admin-uwsgi
+        image: pschiffe/pdns-admin-uwsgi:ngoduykhanh
+        imagePullPolicy: IfNotPresent
+        env:
+        - name: PDNS_ADMIN_SQLA_DB_HOST
+          value: "'mariadb-pdns'"
+        - name: PDNS_ADMIN_SQLA_DB_PORT
+          value: "'3306'"
+        - name: PDNS_ADMIN_SQLA_DB_USER
+          value: "'root'"
+        - name: PDNS_ADMIN_SQLA_DB_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: pdns-admin-secret
+              key: quoted_mysql_password
+        - name: PDNS_ADMIN_SQLA_DB_NAME
+          value: "'pdnsadmin'"
+        - name: PDNS_API_URL
+          value: "http://master-api-pdns:8081/"
+        - name: PDNS_VERSION
+          value: "4.2.1"
+        - name: PDNS_API_KEY
+          valueFrom:
+            secretKeyRef:
+              name: master-pdns-secret
+              key: apikey
+        volumeMounts:
+          - name: uploads
+            mountPath: /opt/powerdns-admin/upload/
+        resources:
+          limits:
+            cpu: 300m
+            memory: 128Mi
+          requests:
+            cpu: 50m
+            memory: 64Mi
+      volumes:
+        - name: uploads
+          persistentVolumeClaim:
+            claimName: pdns-admin-pvc
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  labels:
+    app.kubernetes.io/name: pdns-admin-pvc
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: admin
+  name: pdns-admin-pvc
+spec:
+  accessModes:
+  - ReadWriteMany
+  resources:
+    requests:
+      storage: 1Gi
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app.kubernetes.io/name: pdns-admin-svc
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: admin
+  name: admin-dashboard-pdns
+spec:
+  type: ClusterIP
+  ports:
+  - port: 80
+    targetPort: 80
+  selector:
+    app.kubernetes.io/name: pdns-admin
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  labels:
+    app.kubernetes.io/name: pdns-admin-secret
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: admin
+  name: pdns-admin-secret
+data:
+  quoted_mysql_password: J3Jvb3Qn

examples/kubernetes/kustomization.yaml

@@ -0,0 +1,6 @@
+namespace: default
+resources:
+- mariadb.yaml
+- master-daemonset.yaml
+- slave-daemonset.yaml
+- admin-dashboard.yaml

examples/kubernetes/mariadb.yaml

@@ -0,0 +1,126 @@
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  creationTimestamp: null
+  labels:
+    app.kubernetes.io/name: mariadb-pdns
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: mariadb
+  name: mariadb-pdns
+spec:
+  podManagementPolicy: OrderedReady
+  replicas: 1
+  revisionHistoryLimit: 10
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: mariadb-pdns
+      app.kubernetes.io/part-of: pdns
+      app.kubernetes.io/component: mariadb
+  serviceName: mariadb-pdns
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: mariadb-pdns
+        app.kubernetes.io/part-of: pdns
+        app.kubernetes.io/component: mariadb
+    spec:
+      containers:
+      - name: mariadb-pdns
+        image: mariadb:10.4
+        imagePullPolicy: Always
+        env:
+          - name: MYSQL_ROOT_PASSWORD
+            valueFrom:
+              secretKeyRef:
+                name: mariadb-pdns-secret
+                key: password
+        volumeMounts:
+        - name: mariadb-pdns-storage
+          mountPath: /var/lib/mysql
+        - name: mariadb-pdns-config
+          mountPath: /etc/mysql/conf.d
+        ports:
+        - containerPort: 3306
+        resources:
+          limits:
+            cpu: 300m
+            memory: 256Mi
+          requests:
+            cpu: 50m
+            memory: 128Mi
+      volumes:
+        - name: mariadb-pdns-storage
+          persistentVolumeClaim:
+            claimName: mariadb-pdns-pvc
+        - name: mariadb-pdns-config
+          configMap:
+            name: mariadb-pdns-config
+            items:
+              - key: mariadb-override.cnf
+                path: mariadb-override.cnf
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app.kubernetes.io/name: mariadb-pdns-svc
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: mariadb
+  name: mariadb-pdns
+spec:
+  ports:
+  - name: tcp-mysql
+    port: 3306
+    protocol: TCP
+    targetPort: 3306
+  selector:
+      app.kubernetes.io/name: mariadb-pdns
+  sessionAffinity: None
+  type: ClusterIP
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  labels:
+    app.kubernetes.io/name: mariadb-pdns-config
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: mariadb
+  name: mariadb-pdns-config
+data:
+  mariadb-override.cnf: |
+    [mysqld]
+    collation-server = utf8mb4_unicode_ci
+    init-connect='SET NAMES utf8mb4'
+    character-set-server = utf8mb4
+    innodb_buffer_pool_size = 134217728
+    innodb_log_file_size = 134217728
+    innodb-log-files-in-group = 3
+    binlog_format = ROW
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  labels:
+    app.kubernetes.io/name: mariadb-pdns-pvc
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: mariadb
+  name: mariadb-pdns-pvc
+spec:
+  accessModes:
+  - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  labels:
+    app.kubernetes.io/name: mariadb-pdns-secret
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: mariadb
+  name: mariadb-pdns-secret
+data:
+  username: cm9vdA==
+  password: cm9vdA==

examples/kubernetes/master-daemonset.yaml

@@ -0,0 +1,144 @@
+---
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  labels:
+    app.kubernetes.io/name: pdns-master
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: master
+  name: pdns-master
+spec:
+  revisionHistoryLimit: 10
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: pdns-master
+      app.kubernetes.io/part-of: pdns
+      app.kubernetes.io/component: master
+  template:
+    metadata:
+      creationTimestamp: null
+      labels:
+        app.kubernetes.io/name: pdns-master
+        app.kubernetes.io/part-of: pdns
+        app.kubernetes.io/component: master
+    spec:
+      nodeSelector:
+        node-role.kubernetes.io/pdns-master: "true"
+      containers:
+      - image: pschiffe/pdns-mysql:alpine
+        imagePullPolicy: IfNotPresent
+        name: pdns-master
+        env:
+        - name: NODE_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: spec.nodeName
+        - name: PDNS_gmysql_host
+          value: "mariadb-pdns"
+        - name: PDNS_gmysql_port
+          value: "3306"
+        - name: PDNS_gmysql_user
+          valueFrom:
+            secretKeyRef:
+              name: mariadb-pdns-secret
+              key: username
+        - name: PDNS_gmysql_password
+          valueFrom:
+            secretKeyRef:
+              name: mariadb-pdns-secret
+              key: password
+        - name: PDNS_gmysql_dbname
+          value: "master_"
+        - name: PDNS_version_string
+          value: "anonymous"
+        - name: PDNS_master
+          value: "yes"
+        - name: PDNS_api
+          value: "yes"
+        - name: PDNS_api_key
+          valueFrom:
+            secretKeyRef:
+              name: master-pdns-secret
+              key: apikey
+        - name: PDNS_webserver
+          value: "yes"
+        - name: PDNS_webserver_address
+          value: "0.0.0.0"
+        - name: PDNS_webserver_allow_from
+          value: "127.0.0.1/32 10.244.0.0/16"
+        - name: PDNS_webserver_password
+          valueFrom:
+            secretKeyRef:
+              name: master-pdns-secret
+              key: webserver
+        - name: PDNS_default_ttl
+          value: "1500"
+        - name: PDNS_soa_minimum_ttl
+          value: "1200"
+        - name: PDNS_default_soa_name
+          value: "ns1.example.com"
+        - name: PDNS_default_soa_mail
+          value: "dnsmaster.example.com"
+        - name: PDNS_allow_axfr_ips
+          value: "10.0.0.2 10.0.0.3"
+        - name: PDNS_only_notify
+          value: "10.0.0.2 10.0.0.3"
+        - name: PDNS_dnsupdate
+          value: "yes"
+        - name: PDNS_allow_dnsupdate_from
+          value: "10.0.0.1/32 127.0.0.1/32 10.244.0.0/16"
+        resources:
+          limits:
+            cpu: 300m
+            memory: 256Mi
+          requests:
+            cpu: 50m
+            memory: 128Mi
+        ports:
+        - name: dns-udp
+          containerPort: 53
+          protocol: UDP
+          hostPort: 53
+        - name: dns-tcp
+          containerPort: 53
+          protocol: TCP
+          hostPort: 53
+        - containerPort: 8081
+          protocol: TCP
+      dnsPolicy: ClusterFirstWithHostNet
+      restartPolicy: Always
+      schedulerName: default-scheduler
+      securityContext: {}
+      terminationGracePeriodSeconds: 30
+  updateStrategy:
+    rollingUpdate:
+      maxUnavailable: 1
+    type: RollingUpdate
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  labels:
+    app.kubernetes.io/name: master-pdns-secret
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: master
+  name: master-pdns-secret
+data:
+  apikey: MTIzNDU2Nzg5MA==
+  webserver: MDk4NzY1NDMyMQ==
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app.kubernetes.io/name: master-api-pdns
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: master
+  name: master-api-pdns
+spec:
+  type: ClusterIP
+  ports:
+  - port: 8081
+    targetPort: 8081
+  selector:
+    app.kubernetes.io/name: pdns-master

examples/kubernetes/slave-daemonset.yaml

@@ -0,0 +1,96 @@
+---
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  labels:
+    app.kubernetes.io/name: pdns-slave
+    app.kubernetes.io/part-of: pdns
+    app.kubernetes.io/component: slave
+  name: pdns-slave 
+spec:
+  revisionHistoryLimit: 10
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: pdns-slave
+      app.kubernetes.io/part-of: pdns
+      app.kubernetes.io/component: slave
+  template:
+    metadata:
+      creationTimestamp: null
+      labels:
+        app.kubernetes.io/name: pdns-slave
+        app.kubernetes.io/part-of: pdns
+        app.kubernetes.io/component: slave
+    spec:
+      nodeSelector:
+        node-role.kubernetes.io/pdns-slave: "true"
+      containers:
+      - image: pschiffe/pdns-mysql:alpine
+        imagePullPolicy: IfNotPresent
+        name: pdns-slave
+        env:
+        - name: NODE_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: spec.nodeName
+        - name: PDNS_gmysql_host
+          value: "mariadb-pdns"
+        - name: PDNS_gmysql_port
+          value: "3306"
+        - name: PDNS_gmysql_user
+          valueFrom:
+            secretKeyRef:
+              name: mariadb-pdns-secret
+              key: username
+        - name: PDNS_gmysql_password
+          valueFrom:
+            secretKeyRef:
+              name: mariadb-pdns-secret
+              key: password
+        - name: PDNS_gmysql_dbname
+          value: "slave_"
+        - name: PDNS_version_string
+          value: "anonymous"
+        - name: PDNS_disable_axfr
+          value: "yes"
+        - name: PDNS_slave
+          value: "yes"
+        - name: PDNS_superslave
+          value: "yes"
+        - name: PDNS_allow_unsigned_supermaster
+          value: "no"
+        - name: PDNS_allow_notify_from
+          value: "10.0.0.1"
+        - name: SUPERMASTER_HOSTS
+          value: "ns1.example.com"
+        - name: SUPERMASTER_IPS
+          value: "10.0.0.1"
+        ports:
+        - name: dns-udp
+          containerPort: 53
+          protocol: UDP
+          hostPort: 53
+        - name: dns-tcp
+          containerPort: 53
+          protocol: TCP
+          hostPort: 53
+        resources:
+          limits:
+            cpu: 300m
+            memory: 256Mi
+          requests:
+            cpu: 50m
+            memory: 128Mi
+        securityContext:
+          privileged: false
+        terminationMessagePath: /dev/termination-log
+        terminationMessagePolicy: File
+      dnsPolicy: ClusterFirstWithHostNet
+      restartPolicy: Always
+      schedulerName: default-scheduler
+      securityContext: {}
+      terminationGracePeriodSeconds: 30
+  updateStrategy:
+    rollingUpdate:
+      maxUnavailable: 1
+    type: RollingUpdate

pdns/docker-entrypoint.sh

@@ -12,17 +12,21 @@ fi
 : "${PDNS_gmysql_password:=${MYSQL_ENV_MYSQL_PASSWORD:-powerdns}}"
 : "${PDNS_gmysql_dbname:=${MYSQL_ENV_MYSQL_DATABASE:-powerdns}}"
 
-export PDNS_gmysql_host PDNS_gmysql_port PDNS_gmysql_user PDNS_gmysql_password PDNS_gmysql_dbname
+# use first part of node name as database name suffix
+if [ "${NODE_NAME:-}" ]; then
+    NODE_NAME=$(echo ${NODE_NAME} | sed -e 's/\..*//' -e 's/-//')
+    PDNS_gmysql_dbname="${PDNS_gmysql_dbname}${NODE_NAME}"
+fi
 
-# Create config file from template
-envtpl < /pdns.conf.tpl > /etc/pdns/pdns.conf
+
+export PDNS_gmysql_host PDNS_gmysql_port PDNS_gmysql_user PDNS_gmysql_password PDNS_gmysql_dbname
 
 # Initialize DB if needed
 MYSQL_COMMAND="mysql -h ${PDNS_gmysql_host} -P ${PDNS_gmysql_port} -u ${PDNS_gmysql_user} -p${PDNS_gmysql_password}"
 
 until $MYSQL_COMMAND -e ';' ; do
     >&2 echo 'MySQL is unavailable - sleeping'
-    sleep 1
+    sleep 3
 done
 
 $MYSQL_COMMAND -e "CREATE DATABASE IF NOT EXISTS ${PDNS_gmysql_dbname}"
@@ -33,14 +37,30 @@ if [ "$MYSQL_NUM_TABLE" -eq 0 ]; then
     $MYSQL_COMMAND -D "$PDNS_gmysql_dbname" < /usr/share/doc/pdns/schema.mysql.sql
 fi
 
-# Configure supermasters if needed
-if [ "${SUPERMASTER_IPS:-}" ]; then
-    $MYSQL_COMMAND -D "$PDNS_gmysql_dbname" -e "TRUNCATE supermasters;"
-    MYSQL_INSERT_SUPERMASTERS=''
-    for i in $SUPERMASTER_IPS; do
-        MYSQL_INSERT_SUPERMASTERS="${MYSQL_INSERT_SUPERMASTERS} INSERT INTO supermasters VALUES('${i}', '$(hostname -f)', 'admin');"
-    done
-    $MYSQL_COMMAND -D "$PDNS_gmysql_dbname" -e "$MYSQL_INSERT_SUPERMASTERS"
+if [ "${PDNS_superslave:-no}" == "yes" ]; then
+    # Configure supermasters if needed
+    if [ "${SUPERMASTER_IPS:-}" ]; then
+        $MYSQL_COMMAND -D "$PDNS_gmysql_dbname" -e "TRUNCATE supermasters;"
+        MYSQL_INSERT_SUPERMASTERS=''
+        if [ "${SUPERMASTER_COUNT:-0}" == "0" ]; then
+            SUPERMASTER_COUNT=10
+        fi
+        i=1; while [ $i -le ${SUPERMASTER_COUNT} ]; do
+            SUPERMASTER_HOST=$(echo ${SUPERMASTER_HOSTS:-} | awk -v col="$i" '{ print $col }')
+            SUPERMASTER_IP=$(echo ${SUPERMASTER_IPS} | awk -v col="$i" '{ print $col }')
+            if [ -z "${SUPERMASTER_HOST:-}" ]; then
+                SUPERMASTER_HOST=$(hostname -f)
+            fi
+            if [ "${SUPERMASTER_IP:-}" ]; then
+                MYSQL_INSERT_SUPERMASTERS="${MYSQL_INSERT_SUPERMASTERS} INSERT INTO supermasters VALUES('${SUPERMASTER_IP}', '${SUPERMASTER_HOST}', 'admin');"
+            fi
+            i=$(( i + 1 ))
+        done
+        $MYSQL_COMMAND -D "$PDNS_gmysql_dbname" -e "$MYSQL_INSERT_SUPERMASTERS"
+    fi
 fi
 
+# Create config file from template
+envtpl < /pdns.conf.tpl > /etc/pdns/pdns.conf
+
 exec "$@"