steffen
f2257eae40
Build and Push backhaul-agent / build (push) Successful in 42s
One docker run on a database's private network starts backing it up: - backhaul-agent.py: stdlib-only sidecar — every-minute check-in, app-owned dump schedule, streams pg_dump/mysqldump/mongodump home chunked, self-updates. - entrypoint.sh: bootstraps the newest script, installs the once-a-minute cron (sources persisted env), runs once immediately, hands off to cron; logs to a file surfaced via docker logs. - Dockerfile: debian-slim + pg_dump 17 (PGDG — required for Postgres 17 servers) + mysql client. Mongo tools to follow. - CI builds + pushes the public image and asserts the dump tools are present.
46 lines
2.0 KiB
Bash
46 lines
2.0 KiB
Bash
#!/bin/sh
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# backhaul-agent container entrypoint. Bootstraps the newest agent script, installs a
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# once-a-minute cron job (heartbeat + poll for work + self-update), runs once immediately,
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# then hands off to cron. All config comes from env passed to `docker run`.
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set -eu
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: "${BACKHAUL_URL:?set BACKHAUL_URL (e.g. https://backhaul.skui.io)}"
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: "${BACKHAUL_TOKEN:?set BACKHAUL_TOKEN (from the backhaul admin)}"
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APP=/app/backhaul-agent.py
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LOG=/var/log/backhaul-agent.log
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touch "$LOG"
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# Cron jobs run with a bare environment, so persist the vars the agent needs to a file
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# the cron command sources. Single-quoted to survive spaces/specials in values.
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{
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printf "export BACKHAUL_URL='%s'\n" "$BACKHAUL_URL"
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printf "export BACKHAUL_TOKEN='%s'\n" "$BACKHAUL_TOKEN"
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printf "export BACKHAUL_TARGETS='%s'\n" "${BACKHAUL_TARGETS:-}"
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printf "export BACKHAUL_AUTOUPDATE='%s'\n" "${BACKHAUL_AUTOUPDATE:-1}"
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} > /app/env
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chmod 600 /app/env
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# Bootstrap self-update: pull the current script from the app so a fresh container is already
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# up to date. Compile-check and sanity-check before replacing; keep the bundled copy on any
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# failure. Disable with BACKHAUL_AUTOUPDATE=0.
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if [ "${BACKHAUL_AUTOUPDATE:-1}" != "0" ]; then
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if curl -fsS -H "X-Agent-Token: $BACKHAUL_TOKEN" "$BACKHAUL_URL/api/agent-script" \
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-o /tmp/agent.new 2>/dev/null \
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&& python3 -c "compile(open('/tmp/agent.new').read(),'a','exec')" 2>/dev/null \
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&& grep -q backhaul-agent /tmp/agent.new; then
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cp /tmp/agent.new "$APP"
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echo "bootstrap: fetched latest agent script"
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fi
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fi
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# Every-minute cron job (system crontab format needs the user field).
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echo "* * * * * root . /app/env; /usr/bin/python3 $APP >> $LOG 2>&1" > /etc/cron.d/backhaul
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chmod 0644 /etc/cron.d/backhaul
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# Run once now so the first check-in doesn't wait a full minute.
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( . /app/env; /usr/bin/python3 "$APP" >> "$LOG" 2>&1 ) || true
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echo "backhaul-agent up — check-in every minute; logs at $LOG"
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cron # daemonize the scheduler
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exec tail -f "$LOG" # keep PID 1 alive and surface activity in `docker logs`
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