Problem with restore from backup created from replica.

[artemsafiyulin]

Hello! I have a problem with restore backups, witch was make from stand-by server. I have next configuration:

Master-replica based on patroni.

Backup server for creating and testing backups.

If i create backup from master, they restored correctly, but if i create backup from replica, when backup restored and i try start postgresql, i got next error:

2023-12-07 08:08:10 INFO: Starting postgresql
waiting for server to start....2023-12-07 08:08:11.079 GMT [148] LOG:  listening on IPv4 address "127.0.0.1", port 5432
2023-12-07 08:08:11.103 GMT [148] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2023-12-07 08:08:11.122 GMT [148] LOG:  listening on Unix socket "/tmp/.s.PGSQL.5432"
2023-12-07 08:08:11.205 GMT [149] LOG:  database system was interrupted; last known up at 2023-12-07 07:26:47 GMT
2023-12-07 08:08:11.205 GMT [149] LOG:  creating missing WAL directory "pg_wal/archive_status"
.2023-12-07 08:08:12.148 GMT [149] FATAL:  requested timeline 30 does not contain minimum recovery point 572E/FB416508 on timeline 0
2023-12-07 08:08:12.149 GMT [148] LOG:  startup process (PID 149) exited with exit code 1
2023-12-07 08:08:12.149 GMT [148] LOG:  aborting startup due to startup process failure
2023-12-07 08:08:12.162 GMT [148] LOG:  database system is shut down
 stopped waiting
pg_ctl: could not start server

Both postgresql servers has identical cofiguration:

postgres=# select version();
                                                 version                                                  
----------------------------------------------------------------------------------------------------------
 PostgreSQL 11.22 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44), 64-bit
(1 row)

postgres=# \q
-bash-4.2$ pg_probackup-11 --version
pg_probackup-11 2.5.12 (PostgreSQL 11.14)
-bash-4.2$ cat /etc/os-release 
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

-bash-4.2$

Can you please help me with this problem?

P.S. command for creating backup:

pg_probackup-11 backup -B /backup/my_instance-11 --instance=my_instance-11 -b FULL -j 4 --pghost=master_or_replica.domain.com --stream --archive-timeout=1200 --delete-wal --delete-expired

command for restoring backup:

pg_probackup-11 restore -B /backup/my_instance-11/ --instance=my_instance-11 -D /var/lib/pgsql/11/data -j 4 --remote-proto=none

[artemsafiyulin]

Hello again!

I found root cause why when I restore backup maked from replica, I get this error. Reason in pg_control file.
When I maked backup from replica, I found in backup files pg_controldata with next content:

pg_control version number:            1100
Catalog version number:               201809051
Database system identifier:           6848477509408503714
Database cluster state:               in production
pg_control last modified:             Mon Jan 15 06:42:42 2024
Latest checkpoint location:           5806/B15A6510
Latest checkpoint's REDO location:    5806/A4BE5E90
Latest checkpoint's REDO WAL file:    0000001E00005806000000A4
Latest checkpoint's TimeLineID:       30
Latest checkpoint's PrevTimeLineID:   30
Latest checkpoint's full_page_writes: on
Latest checkpoint's NextXID:          2:969059430
Latest checkpoint's NextOID:          8751767
Latest checkpoint's NextMultiXactId:  176014
Latest checkpoint's NextMultiOffset:  847578
Latest checkpoint's oldestXID:        771379076
Latest checkpoint's oldestXID's DB:   16401
Latest checkpoint's oldestActiveXID:  969059420
Latest checkpoint's oldestMultiXid:   1
Latest checkpoint's oldestMulti's DB: 16401
Latest checkpoint's oldestCommitTsXid:0
Latest checkpoint's newestCommitTsXid:0
Time of latest checkpoint:            Mon Jan 15 06:29:12 2024
Fake LSN counter for unlogged rels:   0/1
Minimum recovery ending location:     5806/BC3E1C48
Min recovery ending loc's timeline:   0
Backup start location:                0/0
Backup end location:                  0/0
End-of-backup record required:        no
wal_level setting:                    replica
wal_log_hints setting:                on
max_connections setting:              1600
max_worker_processes setting:         16
max_prepared_xacts setting:           0
max_locks_per_xact setting:           64
track_commit_timestamp setting:       off
Maximum data alignment:               8
Database block size:                  8192
Blocks per segment of large relation: 131072
WAL block size:                       8192
Bytes per WAL segment:                16777216
Maximum length of identifiers:        64
Maximum columns in an index:          32
Maximum size of a TOAST chunk:        1996
Size of a large-object chunk:         2048
Date/time type storage:               64-bit integers
Float4 argument passing:              by value
Float8 argument passing:              by value
Data page checksum version:           0
Mock authentication nonce:            05e779c6bfeca4f438c6584fba46cb70b15bcdb6a3679b4cc227f6565d9d0ad9

This file looks like file copied from master server, not from replica. I checked this theory on my another server, and it approved (when I maked backup from replica from another clusters, in backup files i found pg_control copied from replica).

Than I tried copy pg_control manualy from replica after backup starting. I attached content of this file:

pg_control version number:            1100
Catalog version number:               201809051
Database system identifier:           6848477509408503714
Database cluster state:               in archive recovery
pg_control last modified:             Mon Jan 15 05:26:23 2024
Latest checkpoint location:           5806/54E1C128
Latest checkpoint's REDO location:    5806/415E9B68
Latest checkpoint's REDO WAL file:    0000001E0000580600000041
Latest checkpoint's TimeLineID:       30
Latest checkpoint's PrevTimeLineID:   30
Latest checkpoint's full_page_writes: on
Latest checkpoint's NextXID:          2:968675663
Latest checkpoint's NextOID:          8751767
Latest checkpoint's NextMultiXactId:  176014
Latest checkpoint's NextMultiOffset:  847578
Latest checkpoint's oldestXID:        768678501
Latest checkpoint's oldestXID's DB:   16401
Latest checkpoint's oldestActiveXID:  968675663
Latest checkpoint's oldestMultiXid:   1
Latest checkpoint's oldestMulti's DB: 18073
Latest checkpoint's oldestCommitTsXid:0
Latest checkpoint's newestCommitTsXid:0
Time of latest checkpoint:            Mon Jan 15 04:59:12 2024
Fake LSN counter for unlogged rels:   0/1
Minimum recovery ending location:     5806/637B1BF8
Min recovery ending loc's timeline:   30
Backup start location:                0/0
Backup end location:                  0/0
End-of-backup record required:        no
wal_level setting:                    replica
wal_log_hints setting:                on
max_connections setting:              1600
max_worker_processes setting:         16
max_prepared_xacts setting:           0
max_locks_per_xact setting:           64
track_commit_timestamp setting:       off
Maximum data alignment:               8
Database block size:                  8192
Blocks per segment of large relation: 131072
WAL block size:                       8192
Bytes per WAL segment:                16777216
Maximum length of identifiers:        64
Maximum columns in an index:          32
Maximum size of a TOAST chunk:        1996
Size of a large-object chunk:         2048
Date/time type storage:               64-bit integers
Float4 argument passing:              by value
Float8 argument passing:              by value
Data page checksum version:           0
Mock authentication nonce:            05e779c6bfeca4f438c6584fba46cb70b15bcdb6a3679b4cc227f6565d9d0ad9

And when I change "original" backuped pg_control (look first code block in this message) to manualy copied pg_control (look second code block in this message) - backup restored and started correctly.

Also after restoing backup i checked that data doesn't have corruption. In this cluster checksums doesn't enabled, but I
run pg_dumpall for check that all data can be readed and doesn't have corruption.

Could you help me please found reason why when i make backup I got incorrect pg_control? And how I can fix it?

[funny-falcon]

There is no way inside of pg_probackup to copy single file from other host.

I believe, all files were copied from master, and WAL were streamed from slave.

That is because pghost were specified with dinamic domain, but no remote-host were specified. So that, SSH connection were made to host used with pg_probackup add-instance.