keycloak/templates/_helpers.tpl

@@ -353,7 +353,7 @@ chart's defaults, not the repo standard - see the uid/gid note.
 {{- $defaults := dict
       "runAsNonRoot" true
       "runAsUser" 1000
-      "runAsGroup" 0
+      "runAsGroup" 1000
       "fsGroup" 1000
       "fsGroupChangePolicy" "Always"
       "seccompProfile" (dict "type" "RuntimeDefault") -}}

keycloak/values.schema.json

@@ -248,7 +248,7 @@
       }
     },
     "securityContext": {
-      "description": "May be null / empty at any level: the chart then falls back to its hardening defaults (issue #99). This chart's fallback reproduces ITS defaults, which deviate from the repo's usual 20000/1000 pair - the published image declares keycloak:x:1000:0 in /etc/passwd, puts that user in the ROOT GROUP and copies the whole install tree with --chown=1000:0, so uid 1000 / gid 0 is what the image expects and what makes the mounted build volume writable. Every container in the pod, both init containers included, uses the same container context: readOnlyRootFilesystem: true holds throughout, which is the reason the chart has two init containers rather than one writable one.",
+      "description": "May be null / empty at any level: the chart then falls back to its hardening defaults (issue #99). This chart's fallback reproduces ITS defaults, which deviate from the repo's usual 20000/1000 pair: the published image declares keycloak:x:1000:0 in /etc/passwd and copies the whole install tree with --chown=1000:0, so uid 1000 is the OWNER of everything the process reads. The GROUP is 1000 and not the image's own 0 - counted across the image layer, 521 of 522 entries are owned by 1000:0 with every mode granting the owner full access, so group 0 (upstream's OpenShift arbitrary-uid pattern) buys nothing once the owning uid is pinned, and leaving it out keeps a root GID out of the pod. Every container in the pod, both init containers included, uses the same container context: readOnlyRootFilesystem: true holds throughout, which is the reason the chart has two init containers rather than one writable one.",
       "type": ["object", "null"],
       "additionalProperties": false,
       "properties": {

keycloak/values.yaml

@@ -418,18 +418,33 @@ keycloak:
   securityContext:
     pod:
       runAsNonRoot: true
-      # 1000 AND GROUP 0, which is not this repo's 20000/1000 default and not a
-      # free choice: the published image declares "keycloak:x:1000:0" in
-      # /etc/passwd, adds that user to the ROOT GROUP in /etc/group, and copies
-      # the whole install tree with --chown=1000:0. Everything under
-      # /opt/keycloak is therefore owned by 1000:0 and group-writable, and the
-      # emptyDir mounted over /opt/keycloak/lib/quarkus has to be writable by
-      # the same pair or the build writes nothing.
+      # uid 1000, NOT this repo's 20000, and that is the image's requirement
+      # rather than a free choice: it declares "keycloak:x:1000:0" in
+      # /etc/passwd and copies the whole install tree with --chown=1000:0, so
+      # 1000 is the OWNER of everything the process reads and executes. Read
+      # off the image rather than guessed - `USER 1000` and the chown are in
+      # the config blob's history of quay.io/keycloak/keycloak:26.8.0.
       #
-      # Read off the image rather than guessed: `USER 1000` and the chown are
-      # in the config blob's history of quay.io/keycloak/keycloak:26.8.0.
+      # GROUP 1000 AND NOT 0, WHICH IS WHERE THIS CHART DIVERGES FROM THE
+      # IMAGE'S OWN CONVENTION - deliberately, and measured before deciding.
+      # Upstream puts the keycloak user in the ROOT GROUP and makes the install
+      # tree group-writable (mode 775/664, owner 1000, group 0). That is the
+      # OpenShift arbitrary-uid pattern: it lets ANY uid that happens to be in
+      # group 0 write there. We do not need it, because we pin the uid that
+      # OWNS the files - counted across the image layer, 521 of 522 entries are
+      # owned by 1000:0 and every mode grants the owner full access, so uid
+      # 1000 gets what it needs through the owner bits whatever its group is.
+      # The one remaining entry is /opt itself, which needs only traverse.
+      #
+      # What that buys: no root primary or supplementary GID in this pod, i.e.
+      # no AVD-KSV-0116 finding and no suppression for it. A suppression would
+      # have had to cover the whole chart, serving container included, to
+      # silence a check that is making a fair point.
+      #
+      # If this is ever changed back to 0, the reason has to be a path that
+      # uid 1000 does NOT own - and there is none in this image today.
       runAsUser: 1000
-      runAsGroup: 0
+      runAsGroup: 1000
       fsGroup: 1000
       fsGroupChangePolicy: Always
       seccompProfile: