Updates to the demo:

demo/postgres-survive-kill9/Dockerfile: switched to the glibc Postgres base and removed the unsupported --compression flag; kept the -- separator so DiffKeeper wraps the upstream entrypoint correctly.
demo/postgres-survive-kill9/docker-compose.yml: escaped env vars inside the loader command, made pgbench init idempotent (only initializes if tables are missing), and keeps the workload loop running without wiping data on restart.
Run notes from this machine:

Stack comes up cleanly now; pgbench workload loads and runs.
A manual kill (docker kill -s KILL …) followed by docker compose up -d postgres brings Postgres back with the pgbench counts continuing upward (baseline 504 → after restart 3201).
Compose won’t auto-restart the container after a manual docker kill because restart policies ignore explicit stops; add docker compose up -d postgres (or docker compose restart postgres) after the kill in your script to make it pass.

Author: Shane Wall

demo/postgres-survive-kill9/Dockerfile

@@ -1,6 +1,7 @@
 FROM ghcr.io/saworbit/diffkeeper:latest AS diffkeeper
 
-FROM postgres:16-alpine
+# Debian-based Postgres to match the glibc-linked agent binary
+FROM postgres:16
 
 # Pull the exact agent binary we ship so the demo matches production
 COPY --from=diffkeeper /usr/local/bin/diffkeeper /usr/local/bin/diffkeeper
@@ -13,7 +14,6 @@ ENTRYPOINT ["diffkeeper", \
   "--state-dir=/var/lib/postgresql/data", \
   "--store=/deltas/diffkeeper.bolt", \
   "--snapshot-interval=15", \
-  "--compression=zstd", \
   "--metrics-addr=:9911", \
   "--", \
   "docker-entrypoint.sh"]

demo/postgres-survive-kill9/README.md

@@ -13,13 +13,13 @@ docker compose up -d
 Linux/Mac:
 
 ```bash
-./chaos.sh
+./chaos.sh  # restarts the container after each kill
 ```
 
 Windows:
 
 ```bat
-chaos.bat
+chaos.bat   # restarts the container after each kill
 ```
 
 ## Verify zero data loss

demo/postgres-survive-kill9/chaos.bat

@@ -17,4 +17,6 @@ set /a delay=%RANDOM% %% 8 + 3
 timeout /t %delay% >nul
 echo %date% %time% sending kill -9 to %target%
 docker kill -s KILL %target% >nul 2>&1
+rem Ensure the container comes back up (restart policies sometimes skip manual kills)
+docker compose up -d postgres >nul 2>&1
 goto loop

demo/postgres-survive-kill9/chaos.sh

@@ -15,4 +15,6 @@ while true; do
   fi
   echo "$(date -Iseconds) Sending kill -9 to ${target}"
   docker kill -s KILL "$target" >/dev/null 2>&1 || true
+  # Ensure the container comes back up (restart policies sometimes skip manual kills)
+  docker compose up -d postgres >/dev/null 2>&1 || true
 done

demo/postgres-survive-kill9/docker-compose.yml

@@ -12,7 +12,7 @@ services:
       POSTGRES_DB: bench
 
   loader:
-    image: postgres:16-alpine
+    image: postgres:16
     restart: unless-stopped
     depends_on:
       - postgres
@@ -21,16 +21,19 @@ services:
       PGUSER: postgres
       PGPASSWORD: postgres
       PGDATABASE: bench
-    entrypoint: /bin/sh
+    entrypoint: /bin/bash
     command: >
       -c "
-        set -e;
-        apk add --no-cache postgresql-client postgresql-contrib;
-        until pg_isready -h "$PGHOST" -U "$PGUSER"; do sleep 1; done;
-        createdb "$PGDATABASE" || true;
-        pgbench -i "$PGDATABASE" || true;
+        set -euo pipefail;
+        apt-get update -qq;
+        apt-get install -y -qq postgresql-client postgresql-contrib;
+        until pg_isready -h "$$PGHOST" -U "$$PGUSER"; do sleep 1; done;
+        createdb "$$PGDATABASE" || true;
+        if ! psql -h "$$PGHOST" -U "$$PGUSER" -d "$$PGDATABASE" -tAc \"SELECT 1 FROM pg_tables WHERE tablename='pgbench_accounts'\" | grep -q 1; then
+          pgbench -i "$$PGDATABASE";
+        fi;
         while true; do
-          pgbench -c 4 -j 2 -t 1000 "$PGDATABASE" || true;
+          pgbench -c 4 -j 2 -t 1000 "$$PGDATABASE" || true;
           sleep 0.5;
         done
       "