$ pg_upgrade -b /usr/local/pgsql/bin/ -B /usr/local/pgsql/bin/ -d data_N1/ -D data_N2/ -r -U po stgres -o "-c max_slot_wal_keep_size=1MB" Performing Consistency Checks ----------------------------- Checking cluster versions ok *failure* Consult the last few lines of "data_N2/pg_upgrade_output.d/20231030T085332.388/log/pg_upgrade_server.log" for the probable cause of the failure. connection to server on socket "/home/hayato/test/pgdump/.s.PGSQL.50432" failed: No such file or directory Is the server running locally and accepting connections on that socket? could not connect to source postmaster started with the command: "/usr/local/pgsql/bin/pg_ctl" -w -l "data_N2/pg_upgrade_output.d/20231030T085332.388/log/pg_upgrade_server.log" -D "data_N1" -o "-p 50432 -b -c max_slot_wal_keep_size=-1 -c max_slot_wal_keep_size=1MB -c listen_addresses='' -c unix_socket_permissions=0700 -c unix_socket_directories='/home/hayato/test/pgdump'" start Failure, exiting