53 lines
2.5 KiB
Bash
Executable File
53 lines
2.5 KiB
Bash
Executable File
#!/bin/bash
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# Postgres backup/restore hook for the discourse `db` service. Invoked by backupbot-two via:
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# backupbot.backup.pre-hook = "/pg_backup.sh backup"
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# backupbot.backup.volumes.postgresql_data.path = "backup.sql"
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# backupbot.restore.post-hook = "/pg_backup.sh restore"
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# Backup dumps the DB to backup.sql (gzip) inside the postgresql_data volume; backupbot archives it.
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# Restore reimports it. Discourse (the rails app + sidekiq) keeps many TCP connections open to the DB
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# and reconnects within milliseconds, so a one-shot pg_terminate_backend is NOT enough: restore must
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# first block all non-local connections at the pg_hba level (so the app cannot reconnect and interfere
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# mid-reimport), then FORCE-drop, recreate, and deterministically reimport the dump, then restore
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# pg_hba. (Mirrors the proven matrix-synapse restore hook.) The previous recipe shipped a pg_dump
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# backup but NO restore hook — a file-level restore did not reload into the running postgres, so a
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# restored backup silently kept the live (un-restored) state. cc-ci caught this: a seeded ci_marker row
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# was gone after restore. Same pattern as the immich / mattermost-lts / ghost recipe-PRs.
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set -e
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BACKUP_FILE='/var/lib/postgresql/data/backup.sql'
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export PGPASSWORD=$(cat "${POSTGRES_PASSWORD_FILE:-/run/secrets/db_password}")
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DB_USER="${POSTGRES_USER:-discourse}"
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DB_NAME="${POSTGRES_DB:-discourse}"
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function backup {
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pg_dump -U "$DB_USER" "$DB_NAME" | gzip > "$BACKUP_FILE"
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}
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function restore {
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cd /var/lib/postgresql/data/
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# Block all non-local connections so the running discourse app + sidekiq cannot reconnect and
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# interfere with the drop/recreate/reimport (a one-shot pg_terminate_backend is not enough — the
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# app reconnects within ms over TCP). Restored on exit.
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restore_hba() {
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cat pg_hba.conf.bak > pg_hba.conf
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rm -f pg_hba.conf.bak
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su postgres -c 'pg_ctl reload'
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}
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cp pg_hba.conf pg_hba.conf.bak
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echo 'local all all trust' > pg_hba.conf
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su postgres -c 'pg_ctl reload'
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trap restore_hba EXIT INT TERM
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# Terminate lingering local sessions, then FORCE-drop + recreate + deterministic reimport.
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psql -U "$DB_USER" -d postgres -c \
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"SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname='${DB_NAME}' AND pid<>pg_backend_pid();"
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psql -U "$DB_USER" -d postgres -c "DROP DATABASE ${DB_NAME} WITH (FORCE);"
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createdb -U "$DB_USER" "$DB_NAME"
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gunzip -c "$BACKUP_FILE" | psql -U "$DB_USER" -d "$DB_NAME" -1 -v ON_ERROR_STOP=1 -f -
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}
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$@
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