diff --git a/README.md b/README.md
index 8303964..099f7e1 100644
--- a/README.md
+++ b/README.md
@@ -160,7 +160,7 @@ It includes support for:
         - [x] Broker
         - [x] Toolset
         - [x] Bookie
-        - [x] ZooKeeper
+        - [x] ZooKeeper (requires the `AdditionalCertificateOutputFormats=true` feature gate to be enabled in the cert-manager deployment when using cert-manager versions below 1.15.0)
     - [x] Authentication
         - [x] JWT
         - [x] OpenID
@@ -402,6 +402,15 @@ helm upgrade -n <namespace> -f values.yaml <pulsar-release-name> apachepulsar/pu
 
 For more detailed information, see our [Upgrading](http://pulsar.apache.org/docs/helm-upgrade/) guide.
 
+## Upgrading to Helm chart version 4.2.0 (not released yet)
+
+### TLS configuration for ZooKeeper has changed
+
+The TLS configuration for ZooKeeper has been changed to fix certificate and private key expiration issues.
+This change impacts configurations that have `tls.enabled` and `tls.zookeeper.enabled` set in `values.yaml`.
+The revised solution requires the `AdditionalCertificateOutputFormats=true` feature gate to be enabled in the `cert-manager` deployment when using cert-manager versions below 1.15.0.
+If you installed `cert-manager` using `./scripts/cert-manager/install-cert-manager.sh`, you can re-run the updated script to set the feature gate. The script currently installs or upgrades cert-manager LTS version 1.12.17, where the feature gate must be explicitly enabled.
+
 ## Upgrading from Helm Chart versions before 4.0.0 to 4.0.0 version and above
 
 ### Pulsar Proxy service's default type has been changed from `LoadBalancer` to `ClusterIP`
diff --git a/charts/pulsar/templates/_autorecovery.tpl b/charts/pulsar/templates/_autorecovery.tpl
index 60ea55d..f5b4185 100644
--- a/charts/pulsar/templates/_autorecovery.tpl
+++ b/charts/pulsar/templates/_autorecovery.tpl
@@ -36,7 +36,7 @@ Define autorecovery zookeeper client tls settings
 */}}
 {{- define "pulsar.autorecovery.zookeeper.tls.settings" -}}
 {{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled }}
-/pulsar/keytool/keytool.sh autorecovery {{ template "pulsar.autorecovery.hostname" . }} true;
+{{- include "pulsar.component.zookeeper.tls.settings" (dict "component" "autorecovery" "isClient" true) -}}
 {{- end }}
 {{- end }}
 
@@ -51,11 +51,6 @@ Define autorecovery tls certs mounts
 - name: ca
   mountPath: "/pulsar/certs/ca"
   readOnly: true
-{{- if .Values.tls.zookeeper.enabled }}
-- name: keytool
-  mountPath: "/pulsar/keytool/keytool.sh"
-  subPath: keytool.sh
-{{- end }}
 {{- end }}
 {{- end }}
 
@@ -72,18 +67,14 @@ Define autorecovery tls certs volumes
       path: tls.crt
     - key: tls.key
       path: tls.key
+    - key: tls-combined.pem
+      path: tls-combined.pem
 - name: ca
   secret:
     secretName: "{{ template "pulsar.certs.issuers.ca.secretName" . }}"
     items:
     - key: ca.crt
       path: ca.crt
-{{- if .Values.tls.zookeeper.enabled }}
-- name: keytool
-  configMap:
-    name: "{{ template "pulsar.fullname" . }}-keytool-configmap"
-    defaultMode: 0755
-{{- end }}
 {{- end }}
 {{- end }}
 
@@ -93,7 +84,7 @@ Define autorecovery init container : verify cluster id
 {{- define "pulsar.autorecovery.init.verify_cluster_id" -}}
 bin/apply-config-from-env.py conf/bookkeeper.conf;
 export BOOKIE_MEM="-Xmx128M";
-{{- include "pulsar.autorecovery.zookeeper.tls.settings" . -}}
+{{- include "pulsar.autorecovery.zookeeper.tls.settings" . }}
 until timeout 15 bin/bookkeeper shell whatisinstanceid; do
   sleep 3;
 done;
diff --git a/charts/pulsar/templates/_bookkeeper.tpl b/charts/pulsar/templates/_bookkeeper.tpl
index b8b367a..a279737 100644
--- a/charts/pulsar/templates/_bookkeeper.tpl
+++ b/charts/pulsar/templates/_bookkeeper.tpl
@@ -37,7 +37,7 @@ Define bookie zookeeper client tls settings
 */}}
 {{- define "pulsar.bookkeeper.zookeeper.tls.settings" -}}
 {{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled }}
-/pulsar/keytool/keytool.sh bookie {{ template "pulsar.bookkeeper.hostname" . }} true;
+{{- include "pulsar.component.zookeeper.tls.settings" (dict "component" "bookie" "isClient" true) -}}
 {{- end }}
 {{- end }}
 
@@ -52,11 +52,6 @@ Define bookie tls certs mounts
 - name: ca
   mountPath: "/pulsar/certs/ca"
   readOnly: true
-{{- if .Values.tls.zookeeper.enabled }}
-- name: keytool
-  mountPath: "/pulsar/keytool/keytool.sh"
-  subPath: keytool.sh
-{{- end }}
 {{- end }}
 {{- end }}
 
@@ -73,18 +68,16 @@ Define bookie tls certs volumes
       path: tls.crt
     - key: tls.key
       path: tls.key
+{{- if .Values.tls.zookeeper.enabled }}
+    - key: tls-combined.pem
+      path: tls-combined.pem
+{{- end }}
 - name: ca
   secret:
     secretName: "{{ template "pulsar.certs.issuers.ca.secretName" . }}"
     items:
     - key: ca.crt
       path: ca.crt
-{{- if .Values.tls.zookeeper.enabled }}
-- name: keytool
-  configMap:
-    name: "{{ template "pulsar.fullname" . }}-keytool-configmap"
-    defaultMode: 0755
-{{- end }}
 {{- end }}
 {{- end }}
 
@@ -147,7 +140,7 @@ Define bookie init container : verify cluster id
 {{- if not (and .Values.volumes.persistence .Values.bookkeeper.volumes.persistence) }}
 bin/apply-config-from-env.py conf/bookkeeper.conf;
 export BOOKIE_MEM="-Xmx128M";
-{{- include "pulsar.bookkeeper.zookeeper.tls.settings" . -}}
+{{- include "pulsar.bookkeeper.zookeeper.tls.settings" . }}
 until timeout 15 bin/bookkeeper shell whatisinstanceid; do
   sleep 3;
 done;
@@ -157,7 +150,7 @@ bin/bookkeeper shell bookieformat -nonInteractive -force -deleteCookie || true
 set -e;
 bin/apply-config-from-env.py conf/bookkeeper.conf;
 export BOOKIE_MEM="-Xmx128M";
-{{- include "pulsar.bookkeeper.zookeeper.tls.settings" . -}}
+{{- include "pulsar.bookkeeper.zookeeper.tls.settings" . }}
 until timeout 15 bin/bookkeeper shell whatisinstanceid; do
   sleep 3;
 done;
diff --git a/charts/pulsar/templates/_broker.tpl b/charts/pulsar/templates/_broker.tpl
index b5b86f2..773ae15 100644
--- a/charts/pulsar/templates/_broker.tpl
+++ b/charts/pulsar/templates/_broker.tpl
@@ -43,7 +43,7 @@ Define broker zookeeper client tls settings
 */}}
 {{- define "pulsar.broker.zookeeper.tls.settings" -}}
 {{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled }}
-/pulsar/keytool/keytool.sh broker {{ template "pulsar.broker.hostname" . }} true;
+{{- include "pulsar.component.zookeeper.tls.settings" (dict "component" "broker" "isClient" true) -}}
 {{- end }}
 {{- end }}
 
@@ -58,11 +58,6 @@ Define broker tls certs mounts
 - name: ca
   mountPath: "/pulsar/certs/ca"
   readOnly: true
-{{- if .Values.tls.zookeeper.enabled }}
-- name: keytool
-  mountPath: "/pulsar/keytool/keytool.sh"
-  subPath: keytool.sh
-{{- end }}
 {{- end }}
 {{- end }}
 
@@ -79,17 +74,15 @@ Define broker tls certs volumes
       path: tls.crt
     - key: tls.key
       path: tls.key
+{{- if .Values.tls.zookeeper.enabled }}
+    - key: tls-combined.pem
+      path: tls-combined.pem
+{{- end }}
 - name: ca
   secret:
     secretName: "{{ template "pulsar.certs.issuers.ca.secretName" . }}"
     items:
     - key: ca.crt
       path: ca.crt
-{{- if .Values.tls.zookeeper.enabled }}
-- name: keytool
-  configMap:
-    name: "{{ template "pulsar.fullname" . }}-keytool-configmap"
-    defaultMode: 0755
-{{- end }}
 {{- end }}
 {{- end }}
diff --git a/charts/pulsar/templates/_certs.tpl b/charts/pulsar/templates/_certs.tpl
index 739fbf0..8c5d93a 100644
--- a/charts/pulsar/templates/_certs.tpl
+++ b/charts/pulsar/templates/_certs.tpl
@@ -57,4 +57,58 @@ Define the pulsar certs ca issuer secret name
 {{- fail "certs.issuers.ca.secretName is required when TLS is enabled and certs.internal_issuer.enabled is false" -}}
 {{- end -}}
 {{- end -}}
+{{- end -}}
+
+{{/*
+Common certificate template
+Usage: {{- include "pulsar.cert.template" (dict "root" . "componentConfig" .Values.proxy "tlsConfig" .Values.tls.proxy) -}}
+*/}}
+{{- define "pulsar.cert.template" -}}
+{{- if eq .root.Values.certs.internal_issuer.apiVersion "cert-manager.io/v1beta1" -}}
+{{- fail "cert-manager.io/v1beta1 is no longer supported. Please set certs.internal_issuer.apiVersion to cert-manager.io/v1" -}}
+{{- end -}}
+apiVersion: "{{ .root.Values.certs.internal_issuer.apiVersion }}"
+kind: Certificate
+metadata:
+  name: "{{ template "pulsar.fullname" .root }}-{{ .tlsConfig.cert_name }}"
+  namespace: {{ template "pulsar.namespace" .root }}
+spec:
+  # Secret names are always required.
+  secretName: "{{ .root.Release.Name }}-{{ .tlsConfig.cert_name }}"
+{{- if .root.Values.tls.zookeeper.enabled }}
+  additionalOutputFormats:
+    - type: CombinedPEM
+{{- end }}
+  duration: "{{ .root.Values.tls.common.duration }}"
+  renewBefore: "{{ .root.Values.tls.common.renewBefore }}"
+  subject:
+    organizations:
+{{ toYaml .root.Values.tls.common.organization | indent 4 }}
+  # The use of the common name field has been deprecated since 2000 and is
+  # discouraged from being used.
+  commonName: "{{ template "pulsar.fullname" .root }}-{{ .componentConfig.component }}"
+  isCA: false
+  privateKey:
+    size: {{ .root.Values.tls.common.keySize }}
+    algorithm: {{ .root.Values.tls.common.keyAlgorithm }}
+    encoding: {{ .root.Values.tls.common.keyEncoding }}
+  usages:
+    - server auth
+    - client auth
+  # At least one of a DNS Name, USI SAN, or IP address is required.
+  dnsNames:
+{{- if .tlsConfig.dnsNames }}
+{{ toYaml .tlsConfig.dnsNames | indent 4 }}
+{{- end }}
+    - {{ printf "*.%s-%s.%s.svc.%s" (include "pulsar.fullname" .root) .componentConfig.component (include "pulsar.namespace" .root) .root.Values.clusterDomain | quote }}
+    - {{ printf "%s-%s" (include "pulsar.fullname" .root) .componentConfig.component | quote }}
+  # Issuer references are always required.
+  issuerRef:
+    name: "{{ template "pulsar.certs.issuers.ca.name" .root }}"
+    # We can reference ClusterIssuers by changing the kind here.
+    # The default value is Issuer (i.e. a locally namespaced Issuer)
+    kind: Issuer
+    # This is optional since cert-manager will default to this value however
+    # if you are using an external issuer, change this to that issuer group.
+    group: cert-manager.io
 {{- end -}}
\ No newline at end of file
diff --git a/charts/pulsar/templates/_toolset.tpl b/charts/pulsar/templates/_toolset.tpl
index fe3295b..0865c67 100644
--- a/charts/pulsar/templates/_toolset.tpl
+++ b/charts/pulsar/templates/_toolset.tpl
@@ -36,7 +36,7 @@ Define toolset zookeeper client tls settings
 */}}
 {{- define "pulsar.toolset.zookeeper.tls.settings" -}}
 {{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled -}}
-/pulsar/keytool/keytool.sh toolset {{ template "pulsar.toolset.hostname" . }} true;
+{{- include "pulsar.component.zookeeper.tls.settings" (dict "component" "toolset" "isClient" true) -}}
 {{- end -}}
 {{- end }}
 
@@ -51,11 +51,6 @@ Define toolset tls certs mounts
 - name: ca
   mountPath: "/pulsar/certs/ca"
   readOnly: true
-{{- if .Values.tls.zookeeper.enabled }}
-- name: keytool
-  mountPath: "/pulsar/keytool/keytool.sh"
-  subPath: keytool.sh
-{{- end }}
 {{- end }}
 {{- end }}
 
@@ -72,17 +67,13 @@ Define toolset tls certs volumes
       path: tls.crt
     - key: tls.key
       path: tls.key
+    - key: tls-combined.pem
+      path: tls-combined.pem
 - name: ca
   secret:
     secretName: "{{ template "pulsar.certs.issuers.ca.secretName" . }}"
     items:
     - key: ca.crt
       path: ca.crt
-{{- if .Values.tls.zookeeper.enabled }}
-- name: keytool
-  configMap:
-    name: "{{ template "pulsar.fullname" . }}-keytool-configmap"
-    defaultMode: 0755
-{{- end }}
 {{- end }}
 {{- end }}
diff --git a/charts/pulsar/templates/_zookeeper.tpl b/charts/pulsar/templates/_zookeeper.tpl
index 215b455..e546cde 100644
--- a/charts/pulsar/templates/_zookeeper.tpl
+++ b/charts/pulsar/templates/_zookeeper.tpl
@@ -53,7 +53,23 @@ Define zookeeper tls settings
 */}}
 {{- define "pulsar.zookeeper.tls.settings" -}}
 {{- if and .Values.tls.enabled .Values.tls.zookeeper.enabled }}
-/pulsar/keytool/keytool.sh zookeeper {{ template "pulsar.zookeeper.hostname" . }} false;
+{{- include "pulsar.component.zookeeper.tls.settings" (dict "component" "zookeeper" "isClient" false) -}}
+{{- end }}
+{{- end }}
+
+{{- define "pulsar.component.zookeeper.tls.settings" }}
+{{- $component := .component -}}
+{{- $isClient := .isClient -}}
+{{- $keyFile := printf "/pulsar/certs/%s/tls-combined.pem" $component -}}
+{{- $caFile := "/pulsar/certs/ca/ca.crt" -}}
+{{- if $isClient }}
+echo $'\n' >> conf/pulsar_env.sh
+echo "PULSAR_EXTRA_OPTS=\"\${PULSAR_EXTRA_OPTS} -Dzookeeper.clientCnxnSocket=org.apache.zookeeper.ClientCnxnSocketNetty -Dzookeeper.client.secure=true -Dzookeeper.client.certReload=true -Dzookeeper.ssl.keyStore.location={{- $keyFile }} -Dzookeeper.ssl.keyStore.type=PEM -Dzookeeper.ssl.trustStore.location={{- $caFile }} -Dzookeeper.ssl.trustStore.type=PEM\"" >> conf/pulsar_env.sh
+echo $'\n' >> conf/bkenv.sh
+echo "BOOKIE_EXTRA_OPTS=\"\${BOOKIE_EXTRA_OPTS} -Dzookeeper.clientCnxnSocket=org.apache.zookeeper.ClientCnxnSocketNetty -Dzookeeper.client.secure=true -Dzookeeper.client.certReload=true -Dzookeeper.ssl.keyStore.location={{- $keyFile }} -Dzookeeper.ssl.keyStore.type=PEM -Dzookeeper.ssl.trustStore.location={{- $caFile }} -Dzookeeper.ssl.trustStore.type=PEM\"" >> conf/bkenv.sh
+{{- else }}
+echo $'\n' >> conf/pulsar_env.sh
+echo "PULSAR_EXTRA_OPTS=\"\${PULSAR_EXTRA_OPTS} -Dzookeeper.ssl.keyStore.location={{- $keyFile }} -Dzookeeper.ssl.keyStore.type=PEM -Dzookeeper.ssl.trustStore.location={{- $caFile }} -Dzookeeper.ssl.trustStore.type=PEM\"" >> conf/pulsar_env.sh
 {{- end }}
 {{- end }}
 
diff --git a/charts/pulsar/templates/keytool.yaml b/charts/pulsar/templates/keytool.yaml
deleted file mode 100644
index 43cec2d..0000000
--- a/charts/pulsar/templates/keytool.yaml
+++ /dev/null
@@ -1,110 +0,0 @@
-#
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-#   http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing,
-# software distributed under the License is distributed on an
-# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-# KIND, either express or implied.  See the License for the
-# specific language governing permissions and limitations
-# under the License.
-#
-
-# script to process key/cert to keystore and truststore
-{{- if .Values.tls.zookeeper.enabled }}
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: "{{ template "pulsar.fullname" . }}-keytool-configmap"
-  namespace: {{ template "pulsar.namespace" . }}
-  labels:
-    {{- include "pulsar.standardLabels" . | nindent 4 }}
-    component: keytool 
-data:
-  keytool.sh: |
-    #!/bin/bash
-    component=$1
-    name=$2
-    isClient=$3
-    crtFile=/pulsar/certs/${component}/tls.crt
-    keyFile=/pulsar/certs/${component}/tls.key
-    caFile=/pulsar/certs/ca/ca.crt
-    tlsDir=/tmp/pulsar-tls$$
-    p12File=${tlsDir}/${component}.p12
-    keyStoreFile=${tlsDir}/${component}.keystore.jks
-    trustStoreFile=${tlsDir}/${component}.truststore.jks
-
-    # create tmp dir for keystore and truststore files
-    mkdir ${tlsDir}
-    chmod 0700 ${tlsDir}
-    
-    function checkFile() {
-        local file=$1
-        local len=$(wc -c ${file} | awk '{print $1}')
-        echo "processing ${file} : len = ${len}"
-        if [ ! -f ${file} ]; then
-            echo "${file} is not found"
-            return -1
-        fi
-        if [ $len -le 0 ]; then
-            echo "${file} is empty"
-            return -1
-        fi
-    }
-
-    function ensureFileNotEmpty() {
-        local file=$1
-        until checkFile ${file}; do
-            echo "file isn't initialized yet ... check in 3 seconds ..." && sleep 3;
-        done;
-    }
-    
-    ensureFileNotEmpty ${crtFile}
-    ensureFileNotEmpty ${keyFile}
-    ensureFileNotEmpty ${caFile}
-    
-    PASSWORD=$(head /dev/urandom | base64 | head -c 24)
-    
-    openssl pkcs12 \
-        -export \
-        -in ${crtFile} \
-        -inkey ${keyFile} \
-        -out ${p12File} \
-        -name ${name} \
-        -passout "pass:${PASSWORD}"
-    
-    keytool -importkeystore \
-        -srckeystore ${p12File} \
-        -srcstoretype PKCS12 -srcstorepass "${PASSWORD}" \
-        -alias ${name} \
-        -destkeystore ${keyStoreFile} \
-        -deststorepass "${PASSWORD}"
-    
-    keytool -import \
-        -file ${caFile} \
-        -storetype JKS \
-        -alias ${name} \
-        -keystore ${trustStoreFile} \
-        -storepass "${PASSWORD}" \
-        -trustcacerts -noprompt
-    
-    ensureFileNotEmpty ${keyStoreFile}
-    ensureFileNotEmpty ${trustStoreFile}
-    
-    if [[ "x${isClient}" == "xtrue" ]]; then
-        echo $'\n' >> conf/pulsar_env.sh
-        echo "PULSAR_EXTRA_OPTS=\"\${PULSAR_EXTRA_OPTS} -Dzookeeper.clientCnxnSocket=org.apache.zookeeper.ClientCnxnSocketNetty -Dzookeeper.client.secure=true -Dzookeeper.ssl.keyStore.location=${keyStoreFile} -Dzookeeper.ssl.keyStore.password=${PASSWORD} -Dzookeeper.ssl.trustStore.location=${trustStoreFile} -Dzookeeper.ssl.trustStore.password=${PASSWORD}\"" >> conf/pulsar_env.sh
-        echo $'\n' >> conf/bkenv.sh
-        echo "BOOKIE_EXTRA_OPTS=\"\${BOOKIE_EXTRA_OPTS} -Dzookeeper.clientCnxnSocket=org.apache.zookeeper.ClientCnxnSocketNetty -Dzookeeper.client.secure=true -Dzookeeper.ssl.keyStore.location=${keyStoreFile} -Dzookeeper.ssl.keyStore.password=${PASSWORD} -Dzookeeper.ssl.trustStore.location=${trustStoreFile} -Dzookeeper.ssl.trustStore.password=${PASSWORD}\"" >> conf/bkenv.sh
-    else
-        echo $'\n' >> conf/pulsar_env.sh
-        echo "PULSAR_EXTRA_OPTS=\"\${PULSAR_EXTRA_OPTS} -Dzookeeper.ssl.keyStore.location=${keyStoreFile} -Dzookeeper.ssl.keyStore.password=${PASSWORD} -Dzookeeper.ssl.trustStore.location=${trustStoreFile} -Dzookeeper.ssl.trustStore.password=${PASSWORD}\"" >> conf/pulsar_env.sh
-    fi
-{{- end }}
diff --git a/charts/pulsar/templates/proxy-statefulset.yaml b/charts/pulsar/templates/proxy-statefulset.yaml
index f7235ba..9324a69 100644
--- a/charts/pulsar/templates/proxy-statefulset.yaml
+++ b/charts/pulsar/templates/proxy-statefulset.yaml
@@ -311,6 +311,10 @@ spec:
                 path: tls.crt
               - key: tls.key
                 path: tls.key
+{{- if .Values.tls.zookeeper.enabled }}
+              - key: tls-combined.pem
+                path: tls-combined.pem
+{{- end }}
         {{- end}}
       {{- end}}
 {{- end }}
diff --git a/charts/pulsar/templates/tls-certs-internal.yaml b/charts/pulsar/templates/tls-certs-internal.yaml
index ffe616a..08fd2b3 100644
--- a/charts/pulsar/templates/tls-certs-internal.yaml
+++ b/charts/pulsar/templates/tls-certs-internal.yaml
@@ -21,323 +21,27 @@
 
 {{- if .Values.tls.proxy.enabled }}
 {{- if .Values.tls.proxy.createCert }}
-apiVersion: "{{ .Values.certs.internal_issuer.apiVersion }}"
-kind: Certificate
-metadata:
-  name: "{{ template "pulsar.fullname" . }}-{{ .Values.tls.proxy.cert_name }}"
-  namespace: {{ template "pulsar.namespace" . }}
-spec:
-  # Secret names are always required.
-  secretName: "{{ .Release.Name }}-{{ .Values.tls.proxy.cert_name }}"
-  duration: "{{ .Values.tls.common.duration }}"
-  renewBefore: "{{ .Values.tls.common.renewBefore }}"
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  subject:
-    organizations:
-{{ toYaml .Values.tls.common.organization | indent 4 }}
-  {{- else }}
-  organization:
-{{ toYaml .Values.tls.common.organization | indent 2 }}
-  {{- end }}
-  # The use of the common name field has been deprecated since 2000 and is
-  # discouraged from being used.
-  commonName: "{{ template "pulsar.fullname" . }}-{{ .Values.proxy.component }}"
-  isCA: false
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  privateKey:
-    size: {{ .Values.tls.common.keySize }}
-    algorithm: {{ .Values.tls.common.keyAlgorithm }}
-    encoding: {{ .Values.tls.common.keyEncoding }}
-  {{- else }}
-  keySize: {{ .Values.tls.common.keySize }}
-  keyAlgorithm: {{ .Values.tls.common.keyAlgorithm }}
-  keyEncoding: {{ .Values.tls.common.keyEncoding }}
-  {{- end }}
-  usages:
-    - server auth
-    - client auth
-  # At least one of a DNS Name, USI SAN, or IP address is required.
-  dnsNames:
-{{- if .Values.tls.proxy.dnsNames }}
-{{ toYaml .Values.tls.proxy.dnsNames | indent 4 }}
-{{- end }}
-    -  "*.{{ template "pulsar.fullname" . }}-{{ .Values.proxy.component }}.{{ template "pulsar.namespace" . }}.svc.{{ .Values.clusterDomain }}"
-    -  "{{ template "pulsar.fullname" . }}-{{ .Values.proxy.component }}"
-  # Issuer references are always required.
-  issuerRef:
-    name: "{{ template "pulsar.certs.issuers.ca.name" . }}"
-    # We can reference ClusterIssuers by changing the kind here.
-    # The default value is Issuer (i.e. a locally namespaced Issuer)
-    kind: Issuer
-    # This is optional since cert-manager will default to this value however
-    # if you are using an external issuer, change this to that issuer group.
-    group: cert-manager.io
+{{ include "pulsar.cert.template" (dict "root" . "componentConfig" .Values.proxy "tlsConfig" .Values.tls.proxy) }}
 ---
 {{- end }}
 {{- end }}
 
 {{- if or .Values.tls.broker.enabled (or .Values.tls.bookie.enabled .Values.tls.zookeeper.enabled) }}
-apiVersion: "{{ .Values.certs.internal_issuer.apiVersion }}"
-kind: Certificate
-metadata:
-  name: "{{ template "pulsar.fullname" . }}-{{ .Values.tls.broker.cert_name }}"
-  namespace: {{ template "pulsar.namespace" . }}
-spec:
-  # Secret names are always required.
-  secretName: "{{ .Release.Name }}-{{ .Values.tls.broker.cert_name }}"
-  duration: "{{ .Values.tls.common.duration }}"
-  renewBefore: "{{ .Values.tls.common.renewBefore }}"
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  subject:
-    organizations:
-{{ toYaml .Values.tls.common.organization | indent 4 }}
-  {{- else }}
-  organization:
-{{ toYaml .Values.tls.common.organization | indent 2 }}
-  {{- end }}
-  # The use of the common name field has been deprecated since 2000 and is
-  # discouraged from being used.
-  commonName: "{{ template "pulsar.fullname" . }}-{{ .Values.broker.component }}"
-  isCA: false
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  privateKey:
-    size: {{ .Values.tls.common.keySize }}
-    algorithm: {{ .Values.tls.common.keyAlgorithm }}
-    encoding: {{ .Values.tls.common.keyEncoding }}
-  {{- else }}
-  keySize: {{ .Values.tls.common.keySize }}
-  keyAlgorithm: {{ .Values.tls.common.keyAlgorithm }}
-  keyEncoding: {{ .Values.tls.common.keyEncoding }}
-  {{- end }}
-  usages:
-    - server auth
-    - client auth
-  # At least one of a DNS Name, USI SAN, or IP address is required.
-  dnsNames:
-{{- if .Values.tls.broker.dnsNames }}
-{{ toYaml .Values.tls.broker.dnsNames | indent 4 }}
-{{- end}}
-    -  "*.{{ template "pulsar.fullname" . }}-{{ .Values.broker.component }}.{{ template "pulsar.namespace" . }}.svc.{{ .Values.clusterDomain }}"
-    -  "{{ template "pulsar.fullname" . }}-{{ .Values.broker.component }}"
-  # Issuer references are always required.
-  issuerRef:
-    name: "{{ template "pulsar.certs.issuers.ca.name" . }}"
-    # We can reference ClusterIssuers by changing the kind here.
-    # The default value is Issuer (i.e. a locally namespaced Issuer)
-    kind: Issuer
-    # This is optional since cert-manager will default to this value however
-    # if you are using an external issuer, change this to that issuer group.
-    group: cert-manager.io
+{{ include "pulsar.cert.template" (dict "root" . "componentConfig" .Values.broker "tlsConfig" .Values.tls.broker) }}
 ---
 {{- end }}
 
 {{- if or .Values.tls.bookie.enabled .Values.tls.zookeeper.enabled }}
-apiVersion: "{{ .Values.certs.internal_issuer.apiVersion }}"
-kind: Certificate
-metadata:
-  name: "{{ template "pulsar.fullname" . }}-{{ .Values.tls.bookie.cert_name }}"
-  namespace: {{ template "pulsar.namespace" . }}
-spec:
-  # Secret names are always required.
-  secretName: "{{ .Release.Name }}-{{ .Values.tls.bookie.cert_name }}"
-  duration: "{{ .Values.tls.common.duration }}"
-  renewBefore: "{{ .Values.tls.common.renewBefore }}"
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  subject:
-    organizations:
-{{ toYaml .Values.tls.common.organization | indent 4 }}
-  {{- else }}
-  organization:
-{{ toYaml .Values.tls.common.organization | indent 2 }}
-  {{- end }}
-  # The use of the common name field has been deprecated since 2000 and is
-  # discouraged from being used.
-  commonName: "{{ template "pulsar.fullname" . }}-{{ .Values.bookkeeper.component }}"
-  isCA: false
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  privateKey:
-    size: {{ .Values.tls.common.keySize }}
-    algorithm: {{ .Values.tls.common.keyAlgorithm }}
-    encoding: {{ .Values.tls.common.keyEncoding }}
-  {{- else }}
-  keySize: {{ .Values.tls.common.keySize }}
-  keyAlgorithm: {{ .Values.tls.common.keyAlgorithm }}
-  keyEncoding: {{ .Values.tls.common.keyEncoding }}
-  {{- end }}
-  usages:
-    - server auth
-    - client auth
-  dnsNames:
-{{- if .Values.tls.bookie.dnsNames }}
-{{ toYaml .Values.tls.bookie.dnsNames | indent 4 }}
-{{- end }}
-    -  "*.{{ template "pulsar.fullname" . }}-{{ .Values.bookkeeper.component }}.{{ template "pulsar.namespace" . }}.svc.{{ .Values.clusterDomain }}"
-    -  "{{ template "pulsar.fullname" . }}-{{ .Values.bookkeeper.component }}"
-  # Issuer references are always required.
-  issuerRef:
-    name: "{{ template "pulsar.certs.issuers.ca.name" . }}"
-    # We can reference ClusterIssuers by changing the kind here.
-    # The default value is Issuer (i.e. a locally namespaced Issuer)
-    kind: Issuer
-    # This is optional since cert-manager will default to this value however
-    # if you are using an external issuer, change this to that issuer group.
-    group: cert-manager.io
+{{ include "pulsar.cert.template" (dict "root" . "componentConfig" .Values.bookkeeper "tlsConfig" .Values.tls.bookie) }}
 ---
 {{- end }}
 
 {{- if .Values.tls.zookeeper.enabled }}
-apiVersion: "{{ .Values.certs.internal_issuer.apiVersion }}"
-kind: Certificate
-metadata:
-  name: "{{ template "pulsar.fullname" . }}-{{ .Values.tls.autorecovery.cert_name }}"
-  namespace: {{ template "pulsar.namespace" . }}
-spec:
-  # Secret names are always required.
-  secretName: "{{ .Release.Name }}-{{ .Values.tls.autorecovery.cert_name }}"
-  duration: "{{ .Values.tls.common.duration }}"
-  renewBefore: "{{ .Values.tls.common.renewBefore }}"
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  subject:
-    organizations:
-{{ toYaml .Values.tls.common.organization | indent 4 }}
-  {{- else }}
-  organization:
-{{ toYaml .Values.tls.common.organization | indent 2 }}
-  {{- end }}
-  # The use of the common name field has been deprecated since 2000 and is
-  # discouraged from being used.
-  commonName: "{{ template "pulsar.fullname" . }}-{{ .Values.autorecovery.component }}"
-  isCA: false
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  privateKey:
-    size: {{ .Values.tls.common.keySize }}
-    algorithm: {{ .Values.tls.common.keyAlgorithm }}
-    encoding: {{ .Values.tls.common.keyEncoding }}
-  {{- else }}
-  keySize: {{ .Values.tls.common.keySize }}
-  keyAlgorithm: {{ .Values.tls.common.keyAlgorithm }}
-  keyEncoding: {{ .Values.tls.common.keyEncoding }}
-  {{- end }}
-  usages:
-    - server auth
-    - client auth
-  dnsNames:
-{{- if .Values.tls.autorecovery.dnsNames }}
-{{ toYaml .Values.tls.autorecovery.dnsNames | indent 4 }}
-{{- end }}
-    -  "*.{{ template "pulsar.fullname" . }}-{{ .Values.autorecovery.component }}.{{ template "pulsar.namespace" . }}.svc.{{ .Values.clusterDomain }}"
-    -  "{{ template "pulsar.fullname" . }}-{{ .Values.autorecovery.component }}"
-  # Issuer references are always required.
-  issuerRef:
-    name: "{{ template "pulsar.certs.issuers.ca.name" . }}"
-    # We can reference ClusterIssuers by changing the kind here.
-    # The default value is Issuer (i.e. a locally namespaced Issuer)
-    kind: Issuer
-    # This is optional since cert-manager will default to this value however
-    # if you are using an external issuer, change this to that issuer group.
-    group: cert-manager.io
+{{ include "pulsar.cert.template" (dict "root" . "componentConfig" .Values.autorecovery "tlsConfig" .Values.tls.autorecovery) }}
 ---
-apiVersion: "{{ .Values.certs.internal_issuer.apiVersion }}"
-kind: Certificate
-metadata:
-  name: "{{ template "pulsar.fullname" . }}-{{ .Values.tls.toolset.cert_name }}"
-  namespace: {{ template "pulsar.namespace" . }}
-spec:
-  # Secret names are always required.
-  secretName: "{{ .Release.Name }}-{{ .Values.tls.toolset.cert_name }}"
-  duration: "{{ .Values.tls.common.duration }}"
-  renewBefore: "{{ .Values.tls.common.renewBefore }}"
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  subject:
-    organizations:
-{{ toYaml .Values.tls.common.organization | indent 4 }}
-  {{- else }}
-  organization:
-{{ toYaml .Values.tls.common.organization | indent 2 }}
-  {{- end }}
-  # The use of the common name field has been deprecated since 2000 and is
-  # discouraged from being used.
-  commonName: "{{ template "pulsar.fullname" . }}-{{ .Values.toolset.component }}"
-  isCA: false
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  privateKey:
-    size: {{ .Values.tls.common.keySize }}
-    algorithm: {{ .Values.tls.common.keyAlgorithm }}
-    encoding: {{ .Values.tls.common.keyEncoding }}
-  {{- else }}
-  keySize: {{ .Values.tls.common.keySize }}
-  keyAlgorithm: {{ .Values.tls.common.keyAlgorithm }}
-  keyEncoding: {{ .Values.tls.common.keyEncoding }}
-  {{- end }}
-  usages:
-    - server auth
-    - client auth
-  dnsNames:
-{{- if .Values.tls.toolset.dnsNames }}
-{{ toYaml .Values.tls.toolset.dnsNames | indent 4 }}
-{{- end }}
-    -  "*.{{ template "pulsar.fullname" . }}-{{ .Values.toolset.component }}.{{ template "pulsar.namespace" . }}.svc.{{ .Values.clusterDomain }}"
-    -  "{{ template "pulsar.fullname" . }}-{{ .Values.toolset.component }}"
-  # Issuer references are always required.
-  issuerRef:
-    name: "{{ template "pulsar.certs.issuers.ca.name" . }}"
-    # We can reference ClusterIssuers by changing the kind here.
-    # The default value is Issuer (i.e. a locally namespaced Issuer)
-    kind: Issuer
-    # This is optional since cert-manager will default to this value however
-    # if you are using an external issuer, change this to that issuer group.
-    group: cert-manager.io
+{{ include "pulsar.cert.template" (dict "root" . "componentConfig" .Values.toolset "tlsConfig" .Values.tls.toolset) }}
 ---
-apiVersion: "{{ .Values.certs.internal_issuer.apiVersion }}"
-kind: Certificate
-metadata:
-  name: "{{ template "pulsar.fullname" . }}-{{ .Values.tls.zookeeper.cert_name }}"
-  namespace: {{ template "pulsar.namespace" . }}
-spec:
-  # Secret names are always required.
-  secretName: "{{ .Release.Name }}-{{ .Values.tls.zookeeper.cert_name }}"
-  duration: "{{ .Values.tls.common.duration }}"
-  renewBefore: "{{ .Values.tls.common.renewBefore }}"
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  subject:
-    organizations:
-{{ toYaml .Values.tls.common.organization | indent 4 }}
-  {{- else }}
-  organization:
-{{ toYaml .Values.tls.common.organization | indent 2 }}
-  {{- end }}
-  # The use of the common name field has been deprecated since 2000 and is
-  # discouraged from being used.
-  commonName: "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}"
-  isCA: false
-  {{- if eq .Values.certs.internal_issuer.apiVersion "cert-manager.io/v1" }}
-  privateKey:
-    size: {{ .Values.tls.common.keySize }}
-    algorithm: {{ .Values.tls.common.keyAlgorithm }}
-    encoding: {{ .Values.tls.common.keyEncoding }}
-  {{- else }}
-  keySize: {{ .Values.tls.common.keySize }}
-  keyAlgorithm: {{ .Values.tls.common.keyAlgorithm }}
-  keyEncoding: {{ .Values.tls.common.keyEncoding }}
-  {{- end }}
-  usages:
-    - server auth
-    - client auth
-  dnsNames:
-{{- if .Values.tls.zookeeper.dnsNames }}
-{{ toYaml .Values.tls.zookeeper.dnsNames | indent 4 }}
-{{- end }}
-    -  "*.{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}.{{ template "pulsar.namespace" . }}.svc.{{ .Values.clusterDomain }}"
-    -  "{{ template "pulsar.fullname" . }}-{{ .Values.zookeeper.component }}"
-  # Issuer references are always required.
-  issuerRef:
-    name: "{{ template "pulsar.certs.issuers.ca.name" . }}"
-    # We can reference ClusterIssuers by changing the kind here.
-    # The default value is Issuer (i.e. a locally namespaced Issuer)
-    kind: Issuer
-    # This is optional since cert-manager will default to this value however
-    # if you are using an external issuer, change this to that issuer group.
-    group: cert-manager.io
+{{ include "pulsar.cert.template" (dict "root" . "componentConfig" .Values.zookeeper "tlsConfig" .Values.tls.zookeeper) }}
 {{- end }}
 
 {{- end }}
diff --git a/charts/pulsar/templates/zookeeper-statefulset.yaml b/charts/pulsar/templates/zookeeper-statefulset.yaml
index fc7554f..292642a 100755
--- a/charts/pulsar/templates/zookeeper-statefulset.yaml
+++ b/charts/pulsar/templates/zookeeper-statefulset.yaml
@@ -227,9 +227,6 @@ spec:
         - mountPath: "/pulsar/certs/ca"
           name: ca
           readOnly: true
-        - name: keytool
-          mountPath: "/pulsar/keytool/keytool.sh"
-          subPath: keytool.sh
         {{- end }}
         {{- if .Values.zookeeper.extraVolumeMounts }}
 {{ toYaml .Values.zookeeper.extraVolumeMounts | indent 8 }}
@@ -251,16 +248,14 @@ spec:
               path: tls.crt
             - key: tls.key
               path: tls.key
+            - key: tls-combined.pem
+              path: tls-combined.pem
       - name: ca
         secret:
           secretName: "{{ template "pulsar.certs.issuers.ca.secretName" . }}"
           items:
             - key: ca.crt
               path: ca.crt
-      - name: keytool
-        configMap:
-          name: "{{ template "pulsar.fullname" . }}-keytool-configmap"
-          defaultMode: 0755
       {{- end}}
       {{- include "pulsar.imagePullSecrets" . | nindent 6}}
 {{- if and (and .Values.persistence .Values.volumes.persistence) .Values.zookeeper.volumes.persistence }}
diff --git a/scripts/cert-manager/install-cert-manager.sh b/scripts/cert-manager/install-cert-manager.sh
index 8e63066..b35a334 100755
--- a/scripts/cert-manager/install-cert-manager.sh
+++ b/scripts/cert-manager/install-cert-manager.sh
@@ -25,7 +25,7 @@ set -e
 NAMESPACE=cert-manager
 NAME=cert-manager
 # check compatibility with k8s versions from https://cert-manager.io/docs/installation/supported-releases/
-VERSION=v1.12.16
+VERSION=v1.12.17
 
 # Install cert-manager CustomResourceDefinition resources
 echo "Installing cert-manager CRD resources ..."
@@ -41,10 +41,12 @@ echo "Updating local helm chart repository cache ..."
 helm repo update
 
 echo "Installing cert-manager ${VERSION} to namespace ${NAMESPACE} as '${NAME}' ..."
-helm install \
+helm upgrade \
+  --install \
   --namespace ${NAMESPACE} \
   --create-namespace \
   --version ${VERSION} \
+  --set featureGates=AdditionalCertificateOutputFormats=true \
   ${NAME} \
   jetstack/cert-manager
 echo "Successfully installed cert-manager ${VERSION}."