VCF Orchestrator UI is not accessible due to "Runaway kube-system CronJob pods exhaust node memory, causing postgres OOM crash-loops and loss of database connectivity for vco-app."
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VCF Orchestrator UI is not accessible due to "Runaway kube-system CronJob pods exhaust node memory, causing postgres OOM crash-loops and loss of database connectivity for vco-app."

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Article ID: 450809

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Updated On:

Products

VCF Automation

Issue/Introduction

  • VCF Orchestrator UI Unavailable with error "No healthy Upstream". 
  • can see the following error on /services-logs/prelude/vco-app/file-logs/vco-server-app.log 

    YYYY-MM-DD-T INFO vco [host='vco-app-####-###' thread='main' user='' org='' trace=''] {} com.vmware.o11n.infra.DatabaseVerifier - Could not establish a connection to the database.
    YYYY-MM-DD-T ERROR vco [host='vco-app-8564475667-kjvkg' thread='main' user='' org='' trace=''] {} com.vmware.o11n.infra.InfrastructureContextConfig - Unable to validate  Database settings. Retrying in 20s!
    java.lang.RuntimeException: Could not establish a connection to the database.
            
  • kubectl get pods -n kube-system shows many Completed/Error

    prelude-network-monitor-cron pods, and/or a state-enforcement-cron pod that has been Running for days.

  • can see the following error on  /services-logs/prelude/postgres-0/file-logs/postgres.log file 

    YYYY-MM-DD UTC [136781] FATAL terminating connection due to unexpected postmaster exit
    YYYY-MM-DD UTC [136683] FATAL terminating connection due to unexpected postmaster exit
    LOG:  server process (PID 11610) was terminated by signal 9: Killed

Environment

VCF Orchestrator   9.1.0.0100

Cause

A missing backoffLimit in a kube-system CronJob causes unbounded pod multiplication, retaining hundreds of containers on the node. This accumulation traps cri-dockerd in a permanent container-polling loop, directly exhausting node memory and degrading Kubelet health. Ultimately, the severe memory pressure forces the kernel's OOM killer to repeatedly terminate the unprotected Postgres database, causing crash-loops and connectivity loss which could to lead to DB connectivity with vco-app server. 

Resolution

Resolution Steps
This patch is distributed as a single base64 blob - no file needs to be copied onto the node. Every command below decodes the same blob and only changes the trailing flag.

  1. Take a VM snapshot (without memory, quiesced) of all appliance nodes.
  2. Save the patch as a shell variable once per session. Every later step in this KB reuses it:

    PATCH64="#!/bin/bash
# Backport of df6e5ae5af7cb42248eff7b8e3c922014a450cc0 (VCOPS-73671) to 9.1.x, plus
# hardening of the two kube-system CronJobs against leftover-pod accumulation.
#
# Why this matters for the cri-dockerd / dockerd memory incident:
# cri-dockerd starts a permanent per-container goroutine that asks dockerd for that
# container's RW layer size every 60 seconds - for EVERY container in ANY state,
# including exited ones (verified in cri-dockerd 0.3.22: ListContainerStats builds a
# ContainerFilter without State, and ListContainers uses All:true). Retained cron job
# pods therefore add permanent polling load against dockerd. A hanging
# state-enforcement job combined with backoffLimit=6 multiplies leftover pods by up to
# 7x per failed job, and 20/20 history limits keep them all on the node.
#
# This patch requires NO service restart and NO deploy.sh run.
#
# Usage (run as root, on every node):
#   ./patch.sh --observe     # report only, change nothing
#   ./patch.sh --apply
#   ./patch.sh --revert
#
# Tunables (override via environment):
#   SUCCESS_HISTORY   successfulJobsHistoryLimit to set (default 3, product ships 20)
#   FAILED_HISTORY    failedJobsHistoryLimit to set     (default 5, product ships 20)

set -Eeuo pipefail

pr="VCOPS-73671-backport"
logDir="/var/log/vmware/prelude"
timestamp="$(date '+%Y-%m-%d-%H-%M-%S')"
BACKUP_DIR="/data/patch-backup/$pr-$timestamp"

h="$(hostname)"
log() { echo "[$1][$(date '+%Y-%m-%d-%H-%M-%S')][$h] $2" >&2; }
die() { log ERROR "$1"; exit 1; }

SUCCESS_HISTORY="${SUCCESS_HISTORY:-3}"
FAILED_HISTORY="${FAILED_HISTORY:-5}"

SE_SH="/opt/scripts/state_enforcement.sh"
STATUS_PY="/opt/python-modules/vracli/commands/status.py"
CHART_SE="/opt/charts/prelude-k8s/templates/state-enforcement-cron.yaml"
CHART_NM="/opt/charts/prelude-k8s/templates/network-monitor.yaml"
NS="kube-system"
CRONS="state-enforcement-cron prelude-network-monitor-cron"

MODE=""
while [[ $# -gt 0 ]]; do
    case "$1" in
        --observe|--apply|--revert) MODE="${1#--}" ;;
        *) die "Unknown argument: $1" ;;
    esac
    shift
done
[[ -n "$MODE" ]] || die "Specify one of --observe | --apply | --revert (see header)."
[[ "$(id -u)" == "0" ]] || die "Must run as root."

mkdir -p "$logDir"
exec 2> >(tee -a "$logDir/patch-$pr-$timestamp.log")
exec >&2

kc() { kubectl "$@" 2>/dev/null; }

report_state() {
    local ns_ct sb_ct ex_ct jobs failed pleg notready kube_restarts
    ns_ct="$(docker ps -aq --filter 'label=io.kubernetes.docker.type=container' 2>/dev/null | wc -l | tr -d ' ')"
    sb_ct="$(docker ps -aq --filter 'label=io.kubernetes.docker.type=podsandbox' 2>/dev/null | wc -l | tr -d ' ')"
    ex_ct="$(docker ps -aq --filter 'label=io.kubernetes.docker.type=container' --filter status=exited 2>/dev/null | wc -l | tr -d ' ')"
    jobs="$(kc get jobs -n "$NS" --no-headers | wc -l | tr -d ' ')"
    # .status.succeeded is 1 on a completed Job and <none> otherwise. Reading the
    # field by name avoids depending on kubectl's column layout.
    failed="$(kc get jobs -n "$NS" -o custom-columns=S:.status.succeeded --no-headers \
                | grep -vc '^1$' || true)"
    log INFO "containers polled by cri-dockerd (non-sandbox, any state): $ns_ct"
    log INFO "  of which already exited (polled but dead)             : $ex_ct"
    log INFO "  pod sandboxes (not polled)                            : $sb_ct"
    log INFO "retained Jobs in $NS: $jobs   (not-yet-complete/failed: $failed)"
    for c in $CRONS; do
        log INFO "$(printf '%-30s' "$c"): success=$(kc get cronjob "$c" -n "$NS" -o jsonpath='{.spec.successfulJobsHistoryLimit}') failed=$(kc get cronjob "$c" -n "$NS" -o jsonpath='{.spec.failedJobsHistoryLimit}') backoffLimit=$(kc get cronjob "$c" -n "$NS" -o jsonpath='{.spec.jobTemplate.spec.backoffLimit}')"
        log INFO "  retained pods: $(kc get pods -n "$NS" --no-headers | grep -c "$c" || true)"
    done
    # grep -c prints 0 and exits 1 when there is no match, so use `|| true`, not
    # `|| echo 0`, which would emit the count twice.
    log INFO "VCOPS-73671 script timeout present  : $(grep -c STATE_ENFORCEMENT_TIMEOUT "$SE_SH" 2>/dev/null || true)"
    log INFO "VCOPS-73671 status.py timeout present: $(grep -c DEFAULT_CHECK_TIMEOUT "$STATUS_PY" 2>/dev/null || true)"

    # PLEG/kubelet instability check. This is the death-spiral signal: cri-dockerd
    # overloaded by too many polled containers slows down kubelet's CRI calls,
    # which pushes PLEG relist past its unhealthy threshold, which makes kubelet
    # miss that short cron pods already exited - so they hit activeDeadlineSeconds
    # and get retried even though they succeeded. See README for the full chain.
    pleg="$(journalctl -u kubelet --since '24 hours ago' --no-pager 2>/dev/null | grep -c 'PLEG is not healthy' || true)"
    notready="$(journalctl -u kubelet --since '24 hours ago' --no-pager 2>/dev/null | grep -c 'Node became not ready' || true)"
    kube_restarts="$(systemctl show -p NRestarts --value kubelet.service 2>/dev/null || true)"
    log INFO "kubelet 'PLEG is not healthy' (24h)  : ${pleg:-unknown}"
    log INFO "kubelet 'Node became not ready' (24h): ${notready:-unknown}"
    log INFO "kubelet restarts since boot          : ${kube_restarts:-unknown}"
    if [[ "${pleg:-0}" -gt 0 || "${notready:-0}" -gt 0 ]]; then
        log WARN "PLEG/kubelet instability detected - kubectl calls below may be slow or"
        log WARN "need a retry. That slowness is itself confirmation of the diagnosis, not"
        log WARN "a reason to hold off: applying this patch reduces the container count"
        log WARN "driving the instability."
    fi
}

# =================================================================== OBSERVE ==
if [[ "$MODE" == "observe" ]]; then
    log INFO "=== observe mode: no changes will be made ==="
    report_state
    log INFO "Would set history limits to $SUCCESS_HISTORY/$FAILED_HISTORY and backoffLimit=0 on: $CRONS"
    exit 0
fi

# ==================================================================== REVERT ==
if [[ "$MODE" == "revert" ]]; then
    log INFO "=== reverting $pr ==="
    for c in $CRONS; do
        kc patch cronjob "$c" -n "$NS" --type merge \
            -p '{"spec":{"successfulJobsHistoryLimit":20,"failedJobsHistoryLimit":20,"jobTemplate":{"spec":{"backoffLimit":6}}}}' \
            && log INFO "$c restored to 20/20, backoffLimit=6" \
            || log WARN "could not restore $c"
    done
    log WARN "File changes are NOT auto-reverted. Restore them from the newest backup:"
    ls -1d /data/patch-backup/"$pr"-* 2>/dev/null || true
    log WARN "  cp <backup>/state_enforcement.sh $SE_SH"
    log WARN "  cp <backup>/status.py $STATUS_PY"
    log WARN "  cp <backup>/state-enforcement-cron.yaml $CHART_SE"
    log WARN "  cp <backup>/network-monitor.yaml $CHART_NM"
    log INFO "No service restart is needed after restoring."
    exit 0
fi

# ===================================================================== APPLY ==
log INFO "=== applying $pr ==="
log INFO "--- state BEFORE ---"
report_state
mkdir -p "$BACKUP_DIR"
for f in "$SE_SH" "$STATUS_PY" "$CHART_SE" "$CHART_NM"; do
    [[ -f "$f" ]] && cp -a "$f" "$BACKUP_DIR/$(basename "$f")"
done
log INFO "backed up originals to $BACKUP_DIR"

# --- 1. host script: timeouts so state enforcement cannot hang forever --------
if grep -q 'STATE_ENFORCEMENT_TIMEOUT' "$SE_SH" 2>/dev/null; then
    log INFO "$SE_SH already patched; skipping."
else
    rc=0; set +e
    patch --no-backup-if-mismatch -s -f --reject-file=- -p1 -d / << 'SE_PATCH_EOF'
--- /opt/scripts/state_enforcement.sh
+++ /opt/scripts/state_enforcement.sh
@@ -16,8 +16,10 @@ function log_error() {
   log "$1" "ERROR"
 }
 
+STATE_ENFORCEMENT_TIMEOUT=300
+
 log_info "Checking first boot status"
-vracli status first-boot || exit 1
+vracli status first-boot --wait ${STATE_ENFORCEMENT_TIMEOUT} || exit 1
 
 log_info "Applying PRELUDE_PROXY iptables rules"
 vracli cluster exec -- /opt/scripts/iptables/reload-proxy
@@ -25,7 +27,7 @@ vracli cluster exec -- /opt/scripts/iptables/reload-proxy
 log_info "Scaling pods"
 vracli cluster scale-pods
 
-if vracli status deploy; then
+if vracli status deploy --wait ${STATE_ENFORCEMENT_TIMEOUT}; then
 	log_info "Handle licensing."
     [[ -x /opt/scripts/set_license_flags.sh ]] && /opt/scripts/set_license_flags.sh || exit 1
 
SE_PATCH_EOF
    rc=$?; set -e
    if [[ $rc -eq 0 ]] && bash -n "$SE_SH"; then
        log INFO "patched $SE_SH (timeouts on vracli status first-boot / deploy)"
    else
        log ERROR "failed to patch $SE_SH (rc=$rc) - restoring original"
        cp -a "$BACKUP_DIR/$(basename "$SE_SH")" "$SE_SH"
        die "aborting; no other file changes were made yet"
    fi
fi

# --- 2. vracli status: bound the checks even when --wait is not passed --------
# Defence in depth. Step 1 already passes --wait explicitly, so a failure here is
# not fatal to the fix.
if grep -q 'DEFAULT_CHECK_TIMEOUT' "$STATUS_PY" 2>/dev/null; then
    log INFO "$STATUS_PY already patched; skipping."
else
    rc=0; set +e
    patch --no-backup-if-mismatch -s -f --reject-file=- -p1 -d / << 'ST_PATCH_EOF'
--- /opt/python-modules/vracli/commands/status.py
+++ /opt/python-modules/vracli/commands/status.py
@@ -26,6 +26,9 @@ from ctypes import c_char_p
 @vracli_command
 class StatusCommands(BaseCommand):
     name = "status"
+    DEFAULT_CHECK_TIMEOUT = 120
+    SUBPROCESS_TIMEOUT = 60
+
     def __init__(self, logger: logging.Logger, parser_group: argparse.Action):
         super().__init__(logger)
         self.vaconfig = VAConfig()
@@ -131,24 +134,27 @@ class StatusCommands(BaseCommand):
             # Start in background
             check_result = multiprocessing.Value("i", 124, lock=False)
             manager = multiprocessing.Manager()
-            check_output = manager.Value(c_char_p, "")
-            check = multiprocessing.Process(
-                target=check_handler, args=[check_result, check_output])
-            check.start()
+            try:
+                check_output = manager.Value(c_char_p, "")
+                check = multiprocessing.Process(
+                    target=check_handler, args=[check_result, check_output])
+                check.start()
 
-            # Wait until finish or timeout expire. Wait infinitely if wait time not set
-            check.join(None if time_wait == 0 else time_left)
+                join_timeout = time_left if time_wait > 0 else self.DEFAULT_CHECK_TIMEOUT
+                check.join(join_timeout)
 
-            # Report failure if checks completion has timed out.
-            if check.is_alive():
-                check.terminate()
-                check.join()
+                # Report failure if checks completion has timed out.
+                if check.is_alive():
+                    check.terminate()
+                    check.join()
 
-                p.status_code = 124
-                return
+                    p.status_code = 124
+                    return
 
-            result = check_result.value
-            output = check_output.value
+                result = check_result.value
+                output = check_output.value
+            finally:
+                manager.shutdown()
 
             # Break on successful check
             if result == 0:
@@ -209,7 +215,13 @@ class StatusCommands(BaseCommand):
         ]
 
         for i, cmd in enumerate(commands):
-            res = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines="utf-8", shell=True)
+            try:
+                res = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+                                     universal_newlines="utf-8", shell=True, timeout=self.SUBPROCESS_TIMEOUT)
+            except subprocess.TimeoutExpired:
+                output.value = "Not ready"
+                result.value = 1
+                return result.value
             if res.returncode > 0:
                 output.value = "Not ready"
                 result.value = 1
@@ -229,7 +241,13 @@ class StatusCommands(BaseCommand):
         ]
 
         for i, cmd in enumerate(commands):
-            res = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines="utf-8")
+            try:
+                res = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+                                     universal_newlines="utf-8", timeout=self.SUBPROCESS_TIMEOUT)
+            except subprocess.TimeoutExpired:
+                output.value="failed check {}: timed out after {}s".format(" ".join(cmd), self.SUBPROCESS_TIMEOUT)
+                result.value=i+1
+                return result.value
             if res.returncode > 0:
                 output.value="failed check {}: exit code: [{}], stdout: [{}], stderr: [{}]".format(" ".join(cmd), res.returncode, res.stdout, res.stderr)
                 result.value=i+1
@@ -251,7 +269,14 @@ class StatusCommands(BaseCommand):
         cmd = ["vracli", "health", "check", "--checks-location", "/opt/health/default-specs/", "--json", "--profile", "default"]
 
         process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines="utf-8")
-        cmd_output = process.communicate()[0]
+        try:
+            cmd_output = process.communicate(timeout=self.SUBPROCESS_TIMEOUT)[0]
+        except subprocess.TimeoutExpired:
+            process.kill()
+            process.communicate()
+            output.value = "Not Healthy"
+            result.value = 124
+            return result.value
         if process.returncode > 0 or "failed" in cmd_output:
             output.value = "Not Healthy"
             result.value = process.returncode
ST_PATCH_EOF
    rc=$?; set -e
    if [[ $rc -eq 0 ]] && python3 -c "import ast,sys; ast.parse(open('$STATUS_PY').read())"; then
        log INFO "patched $STATUS_PY (check + subprocess timeouts)"
    else
        log WARN "could not cleanly patch $STATUS_PY (rc=$rc) - restoring it and continuing."
        log WARN "The script-level timeout from step 1 is the load-bearing part of this fix."
        cp -a "$BACKUP_DIR/$(basename "$STATUS_PY")" "$STATUS_PY"
    fi
fi

# --- 3. live CronJobs: stop pod multiplication and shorten retention ---------
# Affects future Jobs only; nothing running is disturbed. Lowering the history
# limits also makes the job controller garbage-collect the existing surplus.
for c in $CRONS; do
    if kc patch cronjob "$c" -n "$NS" --type merge \
        -p "{\"spec\":{\"successfulJobsHistoryLimit\":$SUCCESS_HISTORY,\"failedJobsHistoryLimit\":$FAILED_HISTORY,\"jobTemplate\":{\"spec\":{\"backoffLimit\":0}}}}"; then
        log INFO "patched CronJob $c -> history $SUCCESS_HISTORY/$FAILED_HISTORY, backoffLimit=0"
    else
        log WARN "could not patch CronJob $c (is this the node running the control plane?)"
    fi
done

# --- 4. on-disk charts so the CronJob settings survive a deploy.sh -----------
for f in "$CHART_SE" "$CHART_NM"; do
    [[ -f "$f" ]] || { log WARN "$f not found; skipping"; continue; }
    rc=0; set +e
    python3 - "$f" "$SUCCESS_HISTORY" "$FAILED_HISTORY" << 'PYEOF'
import re, sys
path, succ, fail = sys.argv[1], sys.argv[2], sys.argv[3]
src = open(path).read()
orig = src
src = re.sub(r'^(\s*)successfulJobsHistoryLimit:\s*\d+\s*$',
             lambda m: "%ssuccessfulJobsHistoryLimit: %s" % (m.group(1), succ), src, flags=re.M)
src = re.sub(r'^(\s*)failedJobsHistoryLimit:\s*\d+\s*$',
             lambda m: "%sfailedJobsHistoryLimit: %s" % (m.group(1), fail), src, flags=re.M)
# Ensure backoffLimit: 0 sits under jobTemplate.spec
if not re.search(r'^\s*backoffLimit:', src, flags=re.M):
    src, n = re.subn(r'(^  jobTemplate:\n    spec:\n)(?=      )',
                     r'\1      backoffLimit: 0\n', src, count=1, flags=re.M)
    if n == 0:
        sys.stderr.write("BACKOFF-ANCHOR-NOT-FOUND\n"); sys.exit(3)
if src == orig:
    print("no change needed"); sys.exit(0)
open(path, "w").write(src)
print("updated")
PYEOF
    rc=$?; set -e
    if [[ $rc -eq 0 ]]; then
        log INFO "updated chart $f"
    else
        log WARN "could not update chart $f (rc=$rc); live CronJob is still patched,"
        log WARN "but a future deploy.sh would reset it. Edit it by hand."
    fi
done

log INFO "--- state AFTER ---"
report_state
log INFO "=== $pr applied - no service restart required ==="
log INFO "Surplus job pods are garbage-collected by the job controller within a few minutes."
log INFO "Backups: $BACKUP_DIR"
log INFO "Verify with: $0 --observe"
exit 0
"
  3. Inspect first - this changes nothing:
    base64 -d <<< "$PATCH64" | bash -s – --observe


    Note:  the "containers polled by cri-dockerd" figure, the retained pod counts, and the kubelet PLEG/restart counters. If PLEG counters are non-zero, expect the next step to be slower than usual.

  4. . Apply:

    vracli cluster exec – bash -c "base64 -d <<< '$PATCH64' | bash -s – --apply"
  5. Verify (allow a few minutes for job garbage collection):

    base64 -d <<< "$PATCH64" | bash -s – --observe
kubectl get cronjob -n kube-system -o custom-columns=\
NAME:.metadata.name,BACKOFF:.spec.jobTemplate.spec.backoffLimit,\
OK:.spec.successfulJobsHistoryLimit,FAIL:.spec.failedJobsHistoryLimit



  6. Steps to revert: 
    base64 -d <<< "$PATCH64" | bash -s – --revert

    (if PATCH64 is not set in the current shell, run step 2 again first)

    Restores the CronJobs to 20/20 with backoffLimit=6. File changes are not auto-reverted (they are strictly safer than the originals); restore them from the backup directory this patch creates on first run, if required. No restart needed.

 

Downtime for above steps: 
None. This patch does not restart any service and does not require running the product's deploy/reconfigure command.

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