Upgrade: Make sure that the 'recovery.signal' file is absent

[vitabaks]

Before upgrade, make sure that the 'recovery.signal' file is absent in the data directory.

Fixed:

postgres@mds-pgnode02:~$ cat /pgdata/15/main/pg_upgrade_output.d/20240321T070139.948/log/pg_upgrade_server.log
-----------------------------------------------------------------
  pg_upgrade run on Thu Mar 21 07:01:39 2024
-----------------------------------------------------------------

command: "/usr/lib/postgresql/14/bin/pg_ctl" -w -l "/pgdata/15/main/pg_upgrade_output.d/20240321T070139.948/log/pg_upgrade_server.log" -D "/pgdata/14/main" -o "-p 50432 -b -c config_file=/etc/postgresql/14/main/postgresql.conf -c listen_addresses='' -c unix_socket_permissions=0700 -c unix_socket_directories='/pgdata'" start >> "/pgdata/15/main/pg_upgrade_output.d/20240321T070139.948/log/pg_upgrade_server.log" 2>&1
waiting for server to start....'2024-03-21 07:01:40 MSK [344587-1]  LOG:  Auto detecting pg_stat_kcache.linux_hz parameter...
'2024-03-21 07:01:40 MSK [344587-2]  LOG:  pg_stat_kcache.linux_hz is set to 500000
'2024-03-21 07:01:40 MSK [344587-3]  LOG:  redirecting log output to logging collector process
'2024-03-21 07:01:40 MSK [344587-4]  HINT:  Future log output will appear in directory "/var/log/postgresql".
 stopped waiting
pg_ctl: could not start server
Examine the log output.

postgres@mds-pgnode02:~$
'2024-03-21 07:01:29 MSK [260565-44]  LOG:  database system is shut down
'2024-03-21 07:01:40 MSK [344587-5]  LOG:  starting PostgreSQL 14.9 (Debian 14.9-1.pgdg110+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 10.2.1-6) 10.2.1 20210110, 64-bit
'2024-03-21 07:01:40 MSK [344587-6]  LOG:  listening on Unix socket "/pgdata/.s.PGSQL.50432"
'2024-03-21 07:01:40 MSK [344589-1]  LOG:  database system was shut down at 2024-03-21 07:01:29 MSK
'2024-03-21 07:01:40 MSK [344589-2]  FATAL:  must specify restore_command when standby mode is not enabled
'2024-03-21 07:01:40 MSK [344587-7]  LOG:  startup process (PID 344589) exited with exit code 1
'2024-03-21 07:01:40 MSK [344587-8]  LOG:  aborting startup due to startup process failure
'2024-03-21 07:01:40 MSK [344587-9]  LOG:  database system is shut down`