Step 1:

Navigate to nextcloud > html > edit version.php

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<?php
$OC_Version = array(22,1,1,2);
$OC_VersionString = '22.1.1';
$OC_Edition = '';
$OC_Channel = 'stable';
$OC_VersionCanBeUpgradedFrom = array (
  'nextcloud' =>
  array (
    '21.0' => true,
    '22.0' => true,
    '22.1' => true,
    '22.2' => true,   # Add this line
  ),
  'owncloud' =>
  array (
    '10.5' => true,
  ),
);
$OC_Build = '2021-08-26T13:27:46+00:00 1eea64f2c3eb0e110391c24830cea5f8d9c3e6a1';
$vendor = 'nextcloud';

Step 2: Run the ‘helm upgrade…’ command with the desired NextCloud version

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# Example:
helm upgrade nextcloud nextcloud/nextcloud \
  --set image.tag=22.2.0-fpm \
  --set nginx.enabled=true \
  --set nextcloud.host=dragoncoin.com \
  --set nextcloud.username=dragon,nextcloud.password=SOMEVERYCOMPLEXANDVERYVERYLONGPASSWORD \
  --set internalDatabase.enabled=false \
  --set externalDatabase.existingSecret.enabled=true \
  --set externalDatabase.type=postgresql \
  --set externalDatabase.host='nextcloud-db-postgresql.default.svc.cluster.local' \
  --set persistence.enabled=true \
  --set persistence.existingClaim=nextcloud-claim \
  --set persistence.size=100Ti \
  --set livenessProbe.enabled=false \
  --set readinessProbe.enabled=false \
  --set nextcloud.phpConfigs.upload_max_size=40G \
  --set nextcloud.phpConfigs.upload_max_filesize=40G \
  --set nextcloud.phpConfigs.post_max_size=40G \
  --set nextcloud.phpConfigs.memory_limit=80G

Step 3: Check the logs and wait for the upgrading process to complete

Previous pods terminated to make way for new pods

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admin@controller:~$ k get pod
NAME                                              READY   STATUS        RESTARTS   AGE
nextcloud-67855fc94c-lc2xr                        0/2     Terminating   0          74m
nextcloud-db-postgresql-0                         1/1     Running       0          91m
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admin@controller:~$ k get pod
NAME                                              READY   STATUS    RESTARTS   AGE
nextcloud-79b5b775fd-2s4bj                        2/2     Running   0          56s
nextcloud-db-postgresql-0                         1/1     Running   0          92m

Expected 502 errors during pod upgrades

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admin@controller:~$ k logs nextcloud-79b5b775fd-2s4bj nextcloud-nginx
2021/11/01 05:36:49 [error] 32#32: *24 connect() failed (111: Connection refused) while connecting to upstream, client: 10.10.0.95, server: , request: "GET /status.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "dragoncoin.com"
10.10.0.95 - dragon [01/Nov/2021:05:36:49 +0000] "GET /status.php HTTP/1.1" 502 157 "-" "Mozilla/5.0 (Linux) mirall/3.2.2git (build 5903) (Nextcloud, linuxmint-5.4.0-89-generic ClientArchitecture: x86_64 OsArchitecture: x86_64)" "192.168.0.164"

Logs showing that the upgrading process has progressed… and eventually completed

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admin@controller:~$ kubectl logs nextcloud-79b5b775fd-2s4bj nextcloud
 
Initializing nextcloud 22.2.0.2 ...
Upgrading nextcloud from 22.1.1.2 ...
Initializing finished
Nextcloud or one of the apps require upgrade - only a limited number of commands are available
You may use your browser or the occ upgrade command to do the upgrade
Setting log level to debug
Turned on maintenance mode
Updating database schema
Updated database
Updating &lt;lookup_server_connector> ...
Updated &lt;lookup_server_connector> to 1.10.0
Updating &lt;oauth2> ...
Updated &lt;oauth2> to 1.10.0
Updating &lt;files> ...
Updated &lt;files> to 1.17.0
Updating &lt;cloud_federation_api> ...
Updated &lt;cloud_federation_api> to 1.5.0
Updating &lt;dav> ...
Fix broken values of calendar objects
 
 Starting ...
 
Updated &lt;dav> to 1.19.0
Updating &lt;files_sharing> ...
Updated &lt;files_sharing> to 1.14.0
Updating &lt;files_trashbin> ...
Updated &lt;files_trashbin> to 1.12.0
Updating &lt;files_versions> ...
Updated &lt;files_versions> to 1.15.0
Updating &lt;sharebymail> ...
Updated &lt;sharebymail> to 1.12.0
Updating &lt;workflowengine> ...
Updated &lt;workflowengine> to 2.4.0
Updating &lt;systemtags> ...
Updated &lt;systemtags> to 1.12.0
Updating &lt;theming> ...
Updated &lt;theming> to 1.13.0
Updating &lt;accessibility> ...
Migrate old user config
 
    0/0 [>---------------------------]   0% Starting ...
    0/0 [->--------------------------]   0%
 Starting ...
 
Updated &lt;accessibility> to 1.8.0
Updating &lt;contactsinteraction> ...
Updated &lt;contactsinteraction> to 1.3.0
Updating &lt;federatedfilesharing> ...
Updated &lt;federatedfilesharing> to 1.12.0
Updating &lt;provisioning_api> ...
Updated &lt;provisioning_api> to 1.12.0
Updating &lt;settings> ...
Updated &lt;settings> to 1.4.0
Updating &lt;twofactor_backupcodes> ...
Updated &lt;twofactor_backupcodes> to 1.11.0
Updating &lt;updatenotification> ...
Updated &lt;updatenotification> to 1.12.0
Updating &lt;user_status> ...
Updated &lt;user_status> to 1.2.0
Updating &lt;weather_status> ...
Updated &lt;weather_status> to 1.2.0
Checking for update of app accessibility in appstore
Checked for update of app "accessibility" in App Store
Checking for update of app activity in appstore
Checked for update of app "activity" in App Store
Checking for update of app audioplayer in appstore
Checked for update of app "audioplayer" in App Store
Checking for update of app breezedark in appstore
Checked for update of app "breezedark" in App Store
Checking for update of app bruteforcesettings in appstore
Checked for update of app "bruteforcesettings" in App Store
Checking for update of app camerarawpreviews in appstore
Checked for update of app "camerarawpreviews" in App Store
Checking for update of app cloud_federation_api in appstore
Checked for update of app "cloud_federation_api" in App Store
Checking for update of app cms_pico in appstore
Checked for update of app "cms_pico" in App Store
Checking for update of app contactsinteraction in appstore
Checked for update of app "contactsinteraction" in App Store
Checking for update of app dav in appstore
Checked for update of app "dav" in App Store
Checking for update of app documentserver_community in appstore
Checked for update of app "documentserver_community" in App Store
Checking for update of app drawio in appstore
Checked for update of app "drawio" in App Store
Checking for update of app external in appstore
Checked for update of app "external" in App Store
Checking for update of app federatedfilesharing in appstore
Checked for update of app "federatedfilesharing" in App Store
Checking for update of app files in appstore
Checked for update of app "files" in App Store
Checking for update of app files_antivirus in appstore
Checked for update of app "files_antivirus" in App Store
Checking for update of app files_markdown in appstore
Checked for update of app "files_markdown" in App Store
Checking for update of app files_mindmap in appstore
Checked for update of app "files_mindmap" in App Store
Checking for update of app files_pdfviewer in appstore
Checked for update of app "files_pdfviewer" in App Store
Checking for update of app files_rightclick in appstore
Checked for update of app "files_rightclick" in App Store
Checking for update of app files_sharing in appstore
Checked for update of app "files_sharing" in App Store
Checking for update of app files_trashbin in appstore
Checked for update of app "files_trashbin" in App Store
Checking for update of app files_versions in appstore
Checked for update of app "files_versions" in App Store
Checking for update of app files_videoplayer in appstore
Checked for update of app "files_videoplayer" in App Store
Checking for update of app forms in appstore
Checked for update of app "forms" in App Store
Checking for update of app logreader in appstore
Checked for update of app "logreader" in App Store
Checking for update of app lookup_server_connector in appstore
Checked for update of app "lookup_server_connector" in App Store
Checking for update of app maps in appstore
Checked for update of app "maps" in App Store
Checking for update of app music in appstore
Checked for update of app "music" in App Store
Checking for update of app news in appstore
Checked for update of app "news" in App Store
Checking for update of app notifications in appstore
Checked for update of app "notifications" in App Store
Checking for update of app oauth2 in appstore
Checked for update of app "oauth2" in App Store
Checking for update of app password_policy in appstore
Checked for update of app "password_policy" in App Store
Checking for update of app photos in appstore
Checked for update of app "photos" in App Store
Checking for update of app privacy in appstore
Checked for update of app "privacy" in App Store
Checking for update of app provisioning_api in appstore
Checked for update of app "provisioning_api" in App Store
Checking for update of app quicknotes in appstore
Checked for update of app "quicknotes" in App Store
Checking for update of app recommendations in appstore
Checked for update of app "recommendations" in App Store
Checking for update of app registration in appstore
Checked for update of app "registration" in App Store
Checking for update of app richdocuments in appstore
Checked for update of app "richdocuments" in App Store
Checking for update of app serverinfo in appstore
Checked for update of app "serverinfo" in App Store
Checking for update of app settings in appstore
Checked for update of app "settings" in App Store
Checking for update of app sharebymail in appstore
Checked for update of app "sharebymail" in App Store
Checking for update of app spreed in appstore
Checked for update of app "spreed" in App Store
Checking for update of app support in appstore
Checked for update of app "support" in App Store
Checking for update of app survey_client in appstore
Checked for update of app "survey_client" in App Store
Checking for update of app systemtags in appstore
Checked for update of app "systemtags" in App Store
Checking for update of app tasks in appstore
Checked for update of app "tasks" in App Store
Checking for update of app text in appstore
Checked for update of app "text" in App Store
Checking for update of app theming in appstore
Checked for update of app "theming" in App Store
Checking for update of app twofactor_backupcodes in appstore
Checked for update of app "twofactor_backupcodes" in App Store
Checking for update of app updatenotification in appstore
Checked for update of app "updatenotification" in App Store
Checking for update of app user_status in appstore
Checked for update of app "user_status" in App Store
Checking for update of app video_converter in appstore
Checked for update of app "video_converter" in App Store
Checking for update of app viewer in appstore
Checked for update of app "viewer" in App Store
Checking for update of app weather_status in appstore
Checked for update of app "weather_status" in App Store
Checking for update of app workflowengine in appstore
Checked for update of app "workflowengine" in App Store
Starting code integrity check...

After about 5 minutes (depending on the system hardware), NextCloud should be rendered back online. At this point, the upgrade has completed.

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