54 lines
2.0 KiB
Markdown
Executable File
54 lines
2.0 KiB
Markdown
Executable File
Create Back Up File
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docker exec -t phoenixDB pg_dump -U postgres -d phoenix > phoenix_backup.sql
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# PostgreSQL Database Backup in Docker
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## 🛠️ Backup Commands for `phoenixDB`
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### 1️⃣ **Dump Database (Including DROP Statements)**
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```sh
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docker exec -t phoenixDB pg_dump -U postgres -d phoenix -c > phoenix_backup.sql
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```
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📖 Explanation:
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• docker exec -t phoenixDB → Runs the pg_dump command inside the phoenixDB container.
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• pg_dump -U postgres -d phoenix -c:
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• -U postgres → Connect as user postgres.
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• -d phoenix → Dump the phoenix database.
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• -c → Includes DROP statements (cleans tables before restoring).
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• > phoenix_backup.sql → Saves the dump to your host machine.
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🔹 When to Use?
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• Use this when you want to completely overwrite an existing database on restore.
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• Ensures that old tables are dropped before new ones are created.
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# Dump Database (Without DROP Statements)
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```sh
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docker exec -t phoenixDB pg_dump -U postgres -d phoenix > phoenix_backup.sql
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```
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📖 Explanation:
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• Similar to the previous command, but without -c.
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• This does NOT include DROP TABLE statements, meaning:
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• It will fail if restoring to a database that already has tables with the same names.
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• Use this when restoring to a new empty database.
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🔹 When to Use?
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• If you’re backing up for archival purposes.
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• If you don’t want to drop existing data on restore.
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# 🛠️ How to Restore the Backup?
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## Restore to a Database (bkp1)
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```sh
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cat phoenix_backup.sql | docker exec -i phoenixDB psql -U postgres -d bkp1
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```
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📖 Explanation:
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• cat phoenix_backup.sql → Reads the dump file.
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• | → Pipes it into the psql command inside the container.
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• docker exec -i phoenixDB psql -U postgres -d bkp2
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• -i → Allows input redirection.
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• -U postgres → Connects as the postgres user.
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• -d bkp2 → Restores to the bkp2 database
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# 🎯 Final Notes
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• Use the -c flag when restoring into an existing database and you want to drop old tables first.
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• Omit -c when restoring into a new, empty database. |