diff --git a/abra.sh b/abra.sh index 11a0a3e..bc0d9d6 100644 --- a/abra.sh +++ b/abra.sh @@ -1,2 +1,5 @@ export ABRA_MATTERMOST_ENTRYPOINT_VERSION=v2 export BUSYBOX_VERSION=v1 + + +export PG_BACKUP_VERSION=v1 diff --git a/compose.yml b/compose.yml index 2957cb4..7ddb6c2 100644 --- a/compose.yml +++ b/compose.yml @@ -58,9 +58,13 @@ services: deploy: labels: backupbot.backup: "true" - backupbot.backup.pre-hook: "PGPASSWORD=$$(cat $${POSTGRES_PASSWORD_FILE}) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /var/lib/postgresql/data/postgres-backup.sql" - backupbot.backup.post-hook: "rm -rf /var/lib/postgresql/data/postgres-backup.sql" - backupbot.backup.path: "/var/lib/postgresql/data/" + backupbot.backup.pre-hook: "/pg_backup.sh backup" + backupbot.backup.volumes.postgres_data.path: "backup.sql" + backupbot.restore.post-hook: "/pg_backup.sh restore" + configs: + - source: pg_backup + target: /pg_backup.sh + mode: 0555 secrets: @@ -69,6 +73,9 @@ secrets: name: ${STACK_NAME}_postgres_password_${SECRET_POSTGRES_PASSWORD_VERSION} configs: + pg_backup: + name: ${STACK_NAME}_pg_backup_${PG_BACKUP_VERSION} + file: pg_backup.sh abra_mattermost_entrypoint: name: ${STACK_NAME}_entrypoint_${ABRA_MATTERMOST_ENTRYPOINT_VERSION} file: ./entrypoint.sh diff --git a/pg_backup.sh b/pg_backup.sh new file mode 100755 index 0000000..5c5dca4 --- /dev/null +++ b/pg_backup.sh @@ -0,0 +1,32 @@ +#!/bin/bash + +# Postgres backup/restore hook for the `postgres` service. Invoked by backupbot-two via: +# backupbot.backup.pre-hook = "/pg_backup.sh backup" +# backupbot.backup.volumes.postgres_data.path = "backup.sql" +# backupbot.restore.post-hook = "/pg_backup.sh restore" +# Backup dumps the DB to backup.sql (gzip) inside the postgres volume; backupbot archives it. +# Restore reimports it. The mattermost app keeps TCP connections open to the DB, so restore must +# terminate them and FORCE-drop before recreating, then reimport the dump deterministically — the +# previous recipe shipped no restore hook (file-level PGDATA restore did not reload into the running +# postgres), so a restored backup silently kept the live (un-restored) state. + +set -e + +BACKUP_FILE='/var/lib/postgresql/data/backup.sql' +export PGPASSWORD=$(cat "${POSTGRES_PASSWORD_FILE:-/run/secrets/postgres_password}") +DB_USER="${POSTGRES_USER:-mattermost}" +DB_NAME="${POSTGRES_DB:-mattermost}" + +function backup { + pg_dump -U "$DB_USER" "$DB_NAME" | gzip > "$BACKUP_FILE" +} + +function restore { + psql -U "$DB_USER" -d postgres -c \ + "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname='${DB_NAME}' AND pid<>pg_backend_pid();" + psql -U "$DB_USER" -d postgres -c "DROP DATABASE ${DB_NAME} WITH (FORCE);" + createdb -U "$DB_USER" "$DB_NAME" + gunzip -c "$BACKUP_FILE" | psql -U "$DB_USER" -d "$DB_NAME" -1 -v ON_ERROR_STOP=1 -f - +} + +$@