Merge pull request #209 from GlobalDataverseCommunityConsortium/develop

Release v4.20
gdcc · Oct 23, 2020 · 33b0695 · 33b0695
2 parents 4d00ec2 + 1ea178a
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diff --git a/README.rst b/README.rst
@@ -1,7 +1,7 @@
 Deploying, Running and Using Dataverse on Kubernetes
 ====================================================
 
-.. image:: https://raw.githubusercontent.com/IQSS/dataverse-kubernetes/master/docs/img/title-composition.png
+.. image:: docs/img/title-composition.png
 
 |Dataverse badge|
 |Validation badge|
@@ -11,25 +11,28 @@ Deploying, Running and Using Dataverse on Kubernetes
 |Docs badge|
 |IRC badge|
 
-This community-supported project aims to provide simple to re-use Kubernetes
-objects on how to run Dataverse on a Kubernetes cluster.
+This community-supported project aims at offering a new way to deploy, run and
+maintain a Dataverse installation for any purpose on any kind of Kubernetes-based
+cloud infrastructure.
 
-It aims at day-1 deployments and day-2 operations.
+You can use this on your laptop, in your on-prem datacentre or public cloud.
+With the power of `Kubernetes <http://kubernetes.io>`_, many scenarios are possible.
 
 * Documentation: https://dataverse-k8s.rtfd.io
-* Support: https://github.com/IQSS/dataverse-kubernetes/issues
-* Roadmap: https://dataverse-k8s.rtfd.io/en/latest/roadmap.html
+* Support and new ideas: https://github.com/IQSS/dataverse-kubernetes/issues
 
-If you would like to contribute, you are most welcome. Head over to the
-`contribution guide <https://dataverse-k8s.rtfd.io/en/latest/contribute.html>`_
-for details.
+If you would like to contribute, you are most welcome.
 
+This project follows the same branching strategy as the upstream Dataverse
+project, using a ``release`` branch for stable releases plus a ``develop``
+branch. In this branch unexpected or breaking changes may happen.
 
 
-.. |Dataverse badge| image:: https://img.shields.io/badge/Dataverse-v4.19-important.svg
+
+.. |Dataverse badge| image:: https://img.shields.io/badge/Dataverse-v4.20-important.svg
    :target: https://dataverse.org
-.. |Validation badge| image:: https://jenkins.dataverse.org/job/dataverse-k8s/job/Kubeval%20Linting/job/master/badge/icon?subject=kubeval&status=valid&color=purple
-   :target: https://jenkins.dataverse.org/blue/organizations/jenkins/dataverse-k8s%2FKubeval%20Linting/activity?branch=master
+.. |Validation badge| image:: https://jenkins.dataverse.org/job/dataverse-k8s/job/Kubeval%20Linting/job/release/badge/icon?subject=kubeval&status=valid&color=purple
+   :target: https://jenkins.dataverse.org/blue/organizations/jenkins/dataverse-k8s%2FKubeval%20Linting/activity?branch=release
 .. |DockerHub dataverse-k8s badge| image:: https://img.shields.io/static/v1.svg?label=image&message=dataverse-k8s&logo=docker
    :target: https://hub.docker.com/r/iqss/dataverse-k8s
 .. |DockerHub solr-k8s badge| image:: https://img.shields.io/static/v1.svg?label=image&message=solr-k8s&logo=docker

diff --git a/dataverse b/dataverse
diff --git a/docker-compose.yaml b/docker-compose.yaml
@@ -0,0 +1,32 @@
+---
+version: '3.5'
+services:
+
+  postgresql:
+    image: postgres:9.6
+    expose:
+      - 5432
+    environment:
+      - POSTGRES_USER=dataverse
+      - POSTGRES_PASSWORD=changeme
+
+  solr:
+    image: iqss/solr-k8s
+    expose:
+      - 8983
+
+  dataverse:
+    build:
+      context: .
+      dockerfile: ./docker/dataverse-k8s/glassfish-dev/Dockerfile
+    image: iqss/dataverse-k8s:dev
+    depends_on:
+      - postgresql
+      - solr
+    ports:
+      - 8080:8080
+    volumes:
+      - type: bind
+        source: ./personas/docker-compose/secrets
+        target: /secrets
+        read_only: true
diff --git a/docker/dataverse-k8s/Jenkinsfile b/docker/dataverse-k8s/Jenkinsfile
@@ -74,7 +74,7 @@ pipeline {
         }
         stage('latest') {
           when {
-            branch 'master'
+            branch 'release'
           }
           environment {
             // credentials() will magically add DOCKER_HUB_USR and DOCKER_HUB_PSW
@@ -83,7 +83,7 @@ pipeline {
           }
           steps {
             script {
-              // Push master image to latest tag
+              // Push release image to latest tag
               docker.withRegistry("${env.DOCKER_REGISTRY}", "${env.DOCKER_HUB_CRED}") {
                 gf_docker_image.push("latest")
                 pyr_docker_image.push("payara")

diff --git a/docker/dataverse-k8s/bin/bootstrap-job.sh b/docker/dataverse-k8s/bin/bootstrap-job.sh
@@ -17,7 +17,8 @@ DATAVERSE_URL=${DATAVERSE_URL:-"http://${DATAVERSE_SERVICE_HOST}:${DATAVERSE_SER
 # The Solr Service IP is always available under its name within the same namespace.
 # If people want to use a different Solr than we normally deploy, they have the
 # option to override.
-SOLR_K8S_HOST=${SOLR_K8S_HOST:-"solr"}
+SOLR_SERVICE_HOST=${SOLR_SERVICE_HOST:-"solr"}
+SOLR_SERVICE_PORT=${SOLR_SERVICE_PORT:-"8983"}
 
 # Check postgres and API key secrets are available
 if [ ! -s "${SECRETS_DIR}/db/password" ]; then
@@ -53,7 +54,7 @@ sed -i -e "s#dataverse@mailinator.com#${CONTACT_MAIL}#" data/user-admin.json
 ./setup-all.sh --insecure -p="${ADMIN_PASSWORD:-admin}"
 
 # 4.) Configure Solr location
-curl -sS -X PUT -d "${SOLR_K8S_HOST}:8983" "${DATAVERSE_URL}/api/admin/settings/:SolrHostColonPort"
+curl -sS -X PUT -d "${SOLR_SERVICE_HOST}:${SOLR_SERVICE_PORT}" "${DATAVERSE_URL}/api/admin/settings/:SolrHostColonPort"
 
 # 5.) Provision builtin users key to enable creation of more builtin users
 if [ -s "${SECRETS_DIR}/api/userskey" ]; then

diff --git a/docker/dataverse-k8s/bin/default.config b/docker/dataverse-k8s/bin/default.config
@@ -16,6 +16,14 @@ JMX_EXPORTER_CONFIG=${JMX_EXPORTER_CONFIG:-"${HOME}/jmx_exporter_config.yaml"}
 # (Exporting needed as they cannot be seen by `env` otherwise)
 
 export dataverse_files_directory=${dataverse_files_directory:-/data}
+export dataverse_files_storage__driver__id=${dataverse_files_storage__driver__id:-local}
+
+if [ "${dataverse_files_storage__driver__id}" = "local" ]; then
+  export dataverse_files_local_type=${dataverse_files_local_type:-file}
+  export dataverse_files_local_label=${dataverse_files_local_label:-Local}
+  export dataverse_files_local_directory=${dataverse_files_local_directory:-/data}
+fi
+
 export dataverse_rserve_host=${dataverse_rserve_host:-rserve}
 export dataverse_rserve_port=${dataverse_rserve_port:-6311}
 export dataverse_rserve_user=${dataverse_rserve_user:-rserve}

diff --git a/docker/dataverse-k8s/glassfish/Dockerfile b/docker/dataverse-k8s/glassfish/Dockerfile
@@ -8,9 +8,9 @@ FROM centos:7
 
 LABEL maintainer="FDM FZJ <forschungsdaten@fz-juelich.de>"
 
-ARG TINI_VERSION=v0.18.0
+ARG TINI_VERSION=v0.19.0
 ARG JMX_EXPORTER_VERSION=0.12.0
-ARG VERSION=4.19
+ARG VERSION=4.20
 ARG DOMAIN=domain1
 
 ENV HOME_DIR=/opt/dataverse\
@@ -21,11 +21,12 @@ ENV HOME_DIR=/opt/dataverse\
     DOCROOT_DIR=/docroot\
     METADATA_DIR=/metadata\
     SECRETS_DIR=/secrets\
+    DUMPS_DIR=/dumps\
     GLASSFISH_PKG=http://download.java.net/glassfish/4.1/release/glassfish-4.1.zip\
     GLASSFISH_SHA1=704a90899ec5e3b5007d310b13a6001575827293\
     WELD_PKG=https://repo1.maven.org/maven2/org/jboss/weld/weld-osgi-bundle/2.2.10.SP1/weld-osgi-bundle-2.2.10.SP1-glassfish4.jar\
-    GRIZZLY_PKG=http://guides.dataverse.org/en/latest/_downloads/glassfish-grizzly-extra-all.jar\
-    PGDRIVER_PKG=https://jdbc.postgresql.org/download/postgresql-42.2.10.jar\
+    GRIZZLY_PKG=http://guides.dataverse.org/en/${VERSION}/_downloads/glassfish-grizzly-extra-all.jar\
+    PGDRIVER_PKG=https://jdbc.postgresql.org/download/postgresql-42.2.12.jar\
     DATAVERSE_VERSION=${VERSION}\
     DATAVERSE_PKG=https://github.com/IQSS/dataverse/releases/download/v${VERSION}/dvinstall.zip\
     JMX_EXPORTER_PKG=https://repo1.maven.org/maven2/io/prometheus/jmx/jmx_prometheus_javaagent/${JMX_EXPORTER_VERSION}/jmx_prometheus_javaagent-${JMX_EXPORTER_VERSION}.jar\
@@ -43,15 +44,13 @@ RUN groupadd -g 1000 glassfish && \
     useradd -u 1000 -M -s /bin/bash -d ${HOME_DIR} glassfish -g glassfish && \
     echo glassfish:glassfish | chpasswd && \
     mkdir -p ${HOME_DIR} ${SCRIPT_DIR} ${SECRETS_DIR} && \
-    mkdir -p ${DATA_DIR} ${METADATA_DIR} ${DOCROOT_DIR} && \
-    chown -R glassfish: ${HOME_DIR} ${DATA_DIR} ${METADATA_DIR} ${DOCROOT_DIR}
+    mkdir -p ${DATA_DIR} ${METADATA_DIR} ${DOCROOT_DIR} ${DUMPS_DIR} && \
+    chown -R glassfish: ${HOME_DIR} ${DATA_DIR} ${METADATA_DIR} ${DOCROOT_DIR} ${DUMPS_DIR}
 
 # Install tini as minimized init system
-RUN wget --no-verbose -O /tini https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini && \
-    wget --no-verbose -O /tini.asc https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini.asc && \
-    gpg --batch --keyserver "hkp://p80.pool.sks-keyservers.net:80" --recv-keys 595E85A6B1B4779EA4DAAEC70B588DFF0527A9B7 && \
-    gpg --batch --verify /tini.asc /tini && \
-    chmod +x /tini
+RUN wget --no-verbose -O tini-amd64 https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini-amd64 && \
+    echo '93dcc18adc78c65a028a84799ecf8ad40c936fdfc5f2a57b1acda5a8117fa82c tini-amd64' | sha256sum -c - && \
+    mv tini-amd64 /tini && chmod +x /tini
 
 # Install esh template engine from Github
 RUN wget --no-verbose -O esh https://raw.githubusercontent.com/jirutka/esh/v0.3.0/esh && \
@@ -94,6 +93,14 @@ RUN ${GLASSFISH_DIR}/bin/asadmin start-domain && \
     for MEMORY_JVM_OPTION in $(${GLASSFISH_DIR}/bin/asadmin list-jvm-options | grep "Xm[sx]"); do\
         ${GLASSFISH_DIR}/bin/asadmin delete-jvm-options $MEMORY_JVM_OPTION;\
     done && \
+    ${GLASSFISH_DIR}/bin/asadmin create-jvm-options -- "-XX\:+HeapDumpOnOutOfMemoryError" && \
+    ${GLASSFISH_DIR}/bin/asadmin create-jvm-options -- "-XX\:HeapDumpPath=${DUMPS_DIR}" && \
+    ${GLASSFISH_DIR}/bin/asadmin create-jvm-options -- "-XX\:+UseG1GC" && \
+    ${GLASSFISH_DIR}/bin/asadmin create-jvm-options -- "-XX\:+UseStringDeduplication" && \
+    ${GLASSFISH_DIR}/bin/asadmin create-jvm-options -- "-XX\:MaxGCPauseMillis=500" && \
+    ${GLASSFISH_DIR}/bin/asadmin create-jvm-options -- "-XX\:MetaspaceSize=256m" && \
+    ${GLASSFISH_DIR}/bin/asadmin create-jvm-options -- "-XX\:MaxMetaspaceSize=2g" && \
+    ${GLASSFISH_DIR}/bin/asadmin create-jvm-options -- "-XX\:+IgnoreUnrecognizedVMOptions" && \
     ${GLASSFISH_DIR}/bin/asadmin create-jvm-options -- "-server" && \
     ${GLASSFISH_DIR}/bin/asadmin stop-domain && \
     mkdir -p ${DOMAIN_DIR}/autodeploy && \

diff --git a/docker/dataverse-k8s/glassfish/bin/init_1_conf_glassfish.sh b/docker/dataverse-k8s/glassfish/bin/init_1_conf_glassfish.sh
@@ -30,16 +30,29 @@ do
 done
 
 # 1b. Create AWS access credentials when storage driver is set to s3
-#     See IQSS/dataverse-kubernetes#28 for details of this workaround.
-if [ "s3" = "${dataverse_files_storage__driver__id}" ]; then
-  if [ -f ${SECRETS_DIR}/s3/access-key ] && [ -f ${SECRETS_DIR}/s3/secret-key ]; then
-    mkdir -p ${HOME_DIR}/.aws
-    echo "[default]" > ${HOME_DIR}/.aws/credentials
-    cat ${SECRETS_DIR}/s3/access-key | sed -e "s#^#aws_access_key_id = #" -e "s#\$#\n#" >> ${HOME_DIR}/.aws/credentials
-    cat ${SECRETS_DIR}/s3/secret-key | sed -e "s#^#aws_secret_access_key = #" -e "s#\$#\n#" >> ${HOME_DIR}/.aws/credentials
-  else
-    echo "WARNING: Could not find all S3 access secrets in ${SECRETS_DIR}/s3/(access-key|secret-key). Check your Kubernetes Secrets and their mounting!"
-  fi
+# Find all access keys
+if [ -d "${SECRETS_DIR}/s3" ]; then
+  S3_KEYS=`find "${SECRETS_DIR}/s3" -readable -type f -iname '*access-key'`
+  S3_CRED_FILE=${HOME_DIR}/.aws/credentials
+  mkdir -p `dirname "${S3_CRED_FILE}"`
+  rm -f ${S3_CRED_FILE}
+  # Iterate keys
+  while IFS= read -r S3_ACCESS_KEY; do
+    echo "Loading S3 key ${S3_ACCESS_KEY}"
+    # Try to find the secret key, parse for profile and add to the credentials file.
+    S3_PROFILE=`echo "${S3_ACCESS_KEY}" | sed -ne "s#.*/\(.*\)-access-key#\1#p"`
+    S3_SECRET_KEY=`echo "${S3_ACCESS_KEY}" | sed -ne "s#\(.*/\|.*/.*-\)access-key#\1secret-key#p"`
+
+    if [ -r ${S3_SECRET_KEY} ]; then
+      [ -z "${S3_PROFILE}" ] && echo "[default]" >> "${S3_CRED_FILE}" || echo "[${S3_PROFILE}]" >> "${S3_CRED_FILE}"
+      cat "${S3_ACCESS_KEY}" | sed -e "s#^#aws_access_key_id = #" -e "s#\$#\n#" >> "${S3_CRED_FILE}"
+      cat "${S3_SECRET_KEY}" | sed -e "s#^#aws_secret_access_key = #" -e "s#\$#\n#" >> "${S3_CRED_FILE}"
+      echo "" >> "${S3_CRED_FILE}"
+    else
+      echo "ERROR: Could not find or read matching \"$S3_SECRET_KEY\"."
+      exit 1
+    fi
+  done <<< "${S3_KEYS}"
 fi
 
 # 2. Domain-spaced resources (JDBC, JMS, ...)

diff --git a/docker/dataverse-k8s/payara/Dockerfile b/docker/dataverse-k8s/payara/Dockerfile
@@ -4,44 +4,33 @@
 # You may obtain a copy of the License at
 # http://www.apache.org/licenses/LICENSE-2.0
 
-FROM payara/server-full:5.201
+FROM payara/server-full:5.2020.3
 LABEL maintainer="FDM FZJ <forschungsdaten@fz-juelich.de>"
 
-ARG VERSION=4.19
+ARG VERSION=4.20
 ARG DOMAIN=domain1
 
 ENV DATA_DIR=/data\
     DOCROOT_DIR=/docroot\
     METADATA_DIR=/metadata\
     SECRETS_DIR=/secrets\
+    DUMPS_DIR=/dumps\
     DOMAIN_DIR=${PAYARA_DIR}/glassfish/domains/${DOMAIN_NAME}\
     DATAVERSE_VERSION=${VERSION}\
     DATAVERSE_PKG=https://github.com/IQSS/dataverse/releases/download/v${VERSION}/dvinstall.zip\
     PGDRIVER_PKG=https://jdbc.postgresql.org/download/postgresql-42.2.12.jar\
-    MEM_MAX_RAM_PERCENTAGE=70.0\
-    MEM_XSS=512k
+    # Make heap dumps on OOM appear in DUMPS_DIR
+    JVM_ARGS="-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=\${ENV=DUMPS_DIR}"
 
 # Create basic pathes
 USER root
 RUN mkdir -p ${HOME_DIR} ${SCRIPT_DIR} ${SECRETS_DIR} && \
-    mkdir -p ${DATA_DIR} ${METADATA_DIR} ${DOCROOT_DIR} && \
-    chown -R payara: ${DATA_DIR} ${METADATA_DIR} ${DOCROOT_DIR} ${SECRETS_DIR}
-
-# WORKAROUND MEMORY ISSUES UNTIL UPSTREAM FIXES THEM IN NEW RELEASE
-RUN ${PAYARA_DIR}/bin/asadmin --user=${ADMIN_USER} --passwordfile=${PASSWORD_FILE} start-domain ${DOMAIN_NAME} && \
-    ${PAYARA_DIR}/bin/asadmin --user=${ADMIN_USER} --passwordfile=${PASSWORD_FILE} delete-jvm-options \
-        '-XX\:+UnlockExperimentalVMOptions:-XX\:+UseCGroupMemoryLimitForHeap:-XX\:MaxRAMFraction=1' && \
-    ${PAYARA_DIR}/bin/asadmin --user=${ADMIN_USER} --passwordfile=${PASSWORD_FILE} create-jvm-options \
-        '-XX\:+UseContainerSupport:-XX\:MaxRAMPercentage=${ENV=MEM_MAX_RAM_PERCENTAGE}:-Xss${ENV=MEM_XSS}' && \
-    ${PAYARA_DIR}/bin/asadmin --user=${ADMIN_USER} --passwordfile=${PASSWORD_FILE} stop-domain ${DOMAIN_NAME} && \
-    # Cleanup after initialization
-     rm -rf \
-        ${PAYARA_DIR}/glassfish/domains/${DOMAIN_NAME}/osgi-cache \
-        ${PAYARA_DIR}/glassfish/domains/${DOMAIN_NAME}/logs
+    mkdir -p ${DATA_DIR} ${METADATA_DIR} ${DOCROOT_DIR} ${DUMPS_DIR} && \
+    chown -R payara: ${DATA_DIR} ${METADATA_DIR} ${DOCROOT_DIR} ${SECRETS_DIR} ${DUMPS_DIR}
 
 # Install prerequisites
 RUN apt-get -qq update && \
-    apt-get -qqy install postgresql-client jq imagemagick curl
+    apt-get -qqy install postgresql-client jq imagemagick curl wget unzip
 
 # Install esh template engine from Github
 RUN wget --no-verbose -O esh https://raw.githubusercontent.com/jirutka/esh/v0.3.0/esh && \

diff --git a/docker/dataverse-k8s/payara/bin/init_2_conf_payara.sh b/docker/dataverse-k8s/payara/bin/init_2_conf_payara.sh
@@ -34,17 +34,29 @@ do
 done
 
 # 1b. Create AWS access credentials when storage driver is set to s3
-#     See IQSS/dataverse-kubernetes#28 for details of this workaround.
-if [ "s3" = "${dataverse_files_storage__driver__id}" ]; then
-  if [ -f ${SECRETS_DIR}/s3/access-key ] && [ -f ${SECRETS_DIR}/s3/secret-key ]; then
-    echo "INFO: Deploying AWS credentials."
-    mkdir -p ${HOME_DIR}/.aws
-    echo "[default]" > ${HOME_DIR}/.aws/credentials
-    cat ${SECRETS_DIR}/s3/access-key | sed -e "s#^#aws_access_key_id = #" -e "s#\$#\n#" >> ${HOME_DIR}/.aws/credentials
-    cat ${SECRETS_DIR}/s3/secret-key | sed -e "s#^#aws_secret_access_key = #" -e "s#\$#\n#" >> ${HOME_DIR}/.aws/credentials
-  else
-    echo "WARNING: Could not find all S3 access secrets in ${SECRETS_DIR}/s3/(access-key|secret-key). Check your Kubernetes Secrets and their mounting!"
-  fi
+# Find all access keys
+if [ -d "${SECRETS_DIR}/s3" ]; then
+  S3_KEYS=`find "${SECRETS_DIR}/s3" -readable -type f -iname '*access-key'`
+  S3_CRED_FILE=${HOME_DIR}/.aws/credentials
+  mkdir -p `dirname "${S3_CRED_FILE}"`
+  rm -f ${S3_CRED_FILE}
+  # Iterate keys
+  while IFS= read -r S3_ACCESS_KEY; do
+    echo "Loading S3 key ${S3_ACCESS_KEY}"
+    # Try to find the secret key, parse for profile and add to the credentials file.
+    S3_PROFILE=`echo "${S3_ACCESS_KEY}" | sed -ne "s#.*/\(.*\)-access-key#\1#p"`
+    S3_SECRET_KEY=`echo "${S3_ACCESS_KEY}" | sed -ne "s#\(.*/\|.*/.*-\)access-key#\1secret-key#p"`
+
+    if [ -r ${S3_SECRET_KEY} ]; then
+      [ -z "${S3_PROFILE}" ] && echo "[default]" >> "${S3_CRED_FILE}" || echo "[${S3_PROFILE}]" >> "${S3_CRED_FILE}"
+      cat "${S3_ACCESS_KEY}" | sed -e "s#^#aws_access_key_id = #" -e "s#\$#\n#" >> "${S3_CRED_FILE}"
+      cat "${S3_SECRET_KEY}" | sed -e "s#^#aws_secret_access_key = #" -e "s#\$#\n#" >> "${S3_CRED_FILE}"
+      echo "" >> "${S3_CRED_FILE}"
+    else
+      echo "ERROR: Could not find or read matching \"$S3_SECRET_KEY\"."
+      exit 1
+    fi
+  done <<< "${S3_KEYS}"
 fi
 
 # 2. Domain-spaced resources (JDBC, JMS, ...)

diff --git a/docker/solr-k8s/Dockerfile b/docker/solr-k8s/Dockerfile
@@ -10,7 +10,7 @@ LABEL maintainer="FDM FZJ <forschungsdaten@fz-juelich.de>"
 
 ARG WEBHOOK_VERSION=2.6.11
 ARG TINI_VERSION=v0.18.0
-ARG VERSION=4.19
+ARG VERSION=4.20
 ARG COLLECTION=collection1
 ENV SOLR_OPTS="-Dsolr.jetty.request.header.size=102400"\
     COLLECTION_DIR=/opt/solr/server/solr/${COLLECTION}\

diff --git a/docker/solr-k8s/Jenkinsfile b/docker/solr-k8s/Jenkinsfile
@@ -68,7 +68,7 @@ pipeline {
         }
         stage('latest') {
           when {
-            branch 'master'
+            branch 'release'
           }
           environment {
             // credentials() will magically add DOCKER_HUB_USR and DOCKER_HUB_PSW
@@ -77,7 +77,7 @@ pipeline {
           }
           steps {
             script {
-              // Push master image to latest tag
+              // Push release image to latest tag
               docker.withRegistry("${env.DOCKER_REGISTRY}", "${env.DOCKER_HUB_CRED}") {
                 docker_image.push("latest")
               }

diff --git a/docs/.gitignore b/docs/.gitignore
@@ -1 +1,2 @@
 .build
+_build
diff --git a/docs/conf.py b/docs/conf.py
@@ -25,7 +25,7 @@
 author = u'Oliver Bertuch'
 
 # The short X.Y version
-version = u'4.19'
+version = u'4.20'
 # The full version, including alpha/beta/rc tags
 release = version
 
@@ -87,6 +87,7 @@
 autosectionlabel_prefix_document = True
 
 extlinks = {
+    'tree': ('https://github.com/IQSS/dataverse-kubernetes/tree/master/%s', 'folder of master branch '),
     'issue': ('https://github.com/IQSS/dataverse-kubernetes/issues/%s', 'issue '),
     'issue_dv': ('https://github.com/IQSS/dataverse/issues/%s', 'issue '),
     'guide_dv': ('http://guides.dataverse.org/en/'+version+'/%s', 'upstream docs ')