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Added compression support for pg_dumpall (#31)
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@@ -69,7 +69,7 @@ Most variables are the same as in the [official postgres image](https://hub.dock
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| POSTGRES_DB | Comma or space separated list of postgres databases to backup. Required. |
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| POSTGRES_DB_FILE | Alternative to POSTGRES_DB, but with one database per line, for usage with docker secrets. |
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| POSTGRES_EXTRA_OPTS | Additional options for `pg_dump`. Defaults to `-Z9`. |
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| POSTGRES_CLUSTER | Set to `TRUE` in order to use `pg_dumpall` instead. |
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| POSTGRES_CLUSTER | Set to `TRUE` in order to use `pg_dumpall` instead. Also set POSTGRES_EXTRA_OPTS to any value or empty since the default value is not compatible with `pg_dumpall`. |
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| POSTGRES_HOST | Postgres connection parameter; postgres host to connect to. Required. |
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| POSTGRES_PASSWORD | Postgres connection parameter; postgres password to connect with. Required. |
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| POSTGRES_PASSWORD_FILE | Alternative to POSTGRES_PASSWORD, for usage with docker secrets. |
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