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Migrazione di database PostgreSQL dall'on-premise al cloud utilizzando AWS RDS

Di seguito è riportata una guida dettagliata per la migrazione dei database PostgreSQL on-premise nel cloud utilizzando Amazon RDS. Per questo tutorial, dovrai eseguire PostgreSQL 10 o successivo su un server Centos/RHEL Linux.

Passaggio 1:crea directory associate

#script directory
mkdir -p /opt/dba/postgres/migrate/
 
#backup directory
mkdir -p /dbbackup/
 
#log directory
mkdir -p /var/log/postgres/migrate/

Passaggio 2:crea uno script di backup

cd /opt/dba/postgres/migrate/
vi migrateDB_parallel.sh

Incolla i seguenti contenuti:

chmod +x migrateDB_parallel.sh
 
#!/bin/bash
#set -e
set -u #exit immediately upon error
 
#################################################################################################################################
 
# Declare variables
 
migrate_date=$(date +'%m%d%Y')
log_dir=/var/log/postgres/migrate
 
psql_version=$1
 
source_host=$2
source_port=$3
source_database=$4
source_schema=$5
source_dbowner=$6
source_superuser=$7
source_jobs=$8
 
dest_host=$9
dest_port=${10}
dest_database=${11}
dest_dbowner=${12}
dest_superuser=${13}
dest_jobs=${14}
 
schema_only=${15}
no_owner=${16}
no_privileges=${17}
 
backup_dir=${18}/${psql_version}/${source_database}
 
test_run=${19}
 
if [[ ${source_schema} == n ]]; then
  sql_schema=""
  log="${log_dir}/${source_database}_${migrate_date}.log"
else
  sql_schema="--schema=${source_schema}"
  log="${log_dir}/${source_database}_${source_schema}_${migrate_date}.log"
fi
 
if [[ $schema_only == y ]]; then
  sql_schema_only="--schema-only"
else
  sql_schema_only=""
fi
 
if [[ $no_owner == y ]]; then
  sql_no_owner="--no-owner"
else
  sql_no_owner=""
fi
 
if [[ $no_privileges == y ]]; then
  sql_no_privileges="--no-privileges"
else
  sql_no_privileges=""
fi
 
BINDIR="/usr/pgsql-${psql_version}/bin"
 
#BINDIR="/usr/bin"
#log_dir=~/
 
mkdir -p ${log_dir}
 
 
################################################################################################################################
echo "${0} "  > $log
echo "" >> $log
echo "" >> $log
echo "$(date +'%m-%d-%Y %T') - DURATION: BEGIN"  >> $log
echo "" >> $log
echo "" >> $log
 
 
################################################################################################################################
# Display Parameters
echo " - psql_version:          $1"        >> $log
echo "                                    "        >> $log
echo " - source_host:                   $2"        >> $log
echo " - source_port:                   $3"        >> $log
echo " - source_database:               $4"        >> $log
echo " - source_schema:         $5"     >> $log
echo " - source_dbowner:                $6"        >> $log
echo " - source_superuser:              $7"        >> $log
echo " - source_jobs:                   $8"        >> $log
echo "                                    "        >> $log
echo " - dest_host:                     $9"        >> $log
echo " - dest_port:                     ${10}"        >> $log
echo " - dest_database:         ${11}"     >> $log
echo " - dest_dbowner:          ${12}"     >> $log
echo " - dest_superuser:                ${13}"     >> $log
echo " - dest_jobs:                     ${14}"     >> $log
echo "                                    "        >> $log
echo " - schema_only:                   ${15}"     >> $log
echo " - no_owner:                      ${16}"     >> $log
echo " - no_privileges:         ${17}"     >> $log
echo "                                    "        >> $log
echo " - sql_schema_only:               ${sql_schema_only}"     >> $log
echo " - sql_schema:                    ${sql_schema}"     >> $log
echo " - sql_no_owner:          ${sql_no_owner}"     >> $log
echo " - sql_no_privileges:             ${sql_no_privileges}"     >> $log
echo "                                    "        >> $log
echo " - test_run:                      ${19}"     >> $log
echo "                                    "        >> $log
echo " - BINDIR:                      ${BINDIR}" >> $log
echo " - backup_dir:                    ${backup_dir}"     >> $log
echo " - log_file:                    ${log}"    >> $log
echo "" >> $log
echo "" >> $log
echo "" >> $log
 
# vi $log; exit 99;
 
#################################################################################################################################
# Backup database
echo "######################################################################################################"  >> $log
echo "$(date +'%m-%d-%Y %T') - beginning database backup..."  >> $log
echo "" >> $log
echo "" >> $log
 
if [[ ${source_schema} == n ]]; then
 
        echo "# Gather ${source_host}:${source_database} db size..." >> $log
        ${BINDIR}/psql -p ${source_port} postgres -h${source_host} -U${source_superuser} -c"\l+ ${source_database}" >> $log 2>&1
 
else
 
        echo "# Gather ${source_host}:${source_database}.${source_schema} schema size..." >> $log
        ${BINDIR}/psql -p ${source_port} -h${source_host} ${source_database} -U${source_superuser} -c"
                SELECT schema_name, pg_size_pretty(sum(table_size)::bigint) as diskSpace, (sum(table_size) / pg_database_size(current_database())) * 100 as percent
                FROM (
                        SELECT pgn.nspname as schema_name,pg_relation_size(pgc.oid) as table_size
                        FROM   pg_catalog.pg_class pgc
                        JOIN pg_catalog.pg_namespace pgn ON relnamespace = pgn.oid
                        WHERE pgn.nspname='${source_schema}'
                     ) t
                GROUP BY schema_name" >> $log 2>&1
 
fi
 
echo "" >> $log
echo "" >> $log
 
 
echo "# Refresh directories..." >> $log
echo "mkdir -p ${backup_dir}" >> $log 2>&1
echo "rm    -f ${backup_dir}/*" >> $log 2>&1
if [[ $test_run == n ]]; then
      mkdir -p ${backup_dir}  >> $log 2>&1
      rm    -f ${backup_dir}/*  >> $log 2>&1
fi
echo "" >> $log
echo "" >> $log
 
 
# vi $log; exit 99;
 
echo "# Backup database..." >> $log
echo "${BINDIR}/pg_dump -v ${source_database} -h ${source_host} -p ${source_port} -U ${source_dbowner} -Fd -j ${source_jobs} -f ${backup_dir} ${sql_schema} ${sql_schema_only} ${sql_no_owner} ${sql_no_privileges}" >> $log 2>&1
if [[ $test_run == n ]]; then
      ${BINDIR}/pg_dump -v ${source_database} -h ${source_host} -p ${source_port} -U ${source_dbowner} -Fd -j ${source_jobs} -f ${backup_dir} ${sql_schema} ${sql_schema_only} ${sql_no_owner} ${sql_no_privileges}  >> $log 2>&1
fi
echo "" >> $log
echo "" >> $log
echo "$(date +'%m-%d-%Y %T') - completed database backup..." >> $log
echo "" >> $log
echo "" >> $log
echo "" >> $log
 
 
#################################################################################################################################
echo "######################################################################################################"  >> $log
echo "$(date +'%m-%d-%Y %T') - beginning database restore..."  >> $log
echo "" >> $log
echo "" >> $log
 
 
 
 
if [[ ${source_schema} == n ]]; then
 
        echo "# Grant ${dest_dbowner} createdb..." >> $log
        echo "${BINDIR}/psql -E -e postgres -h${dest_host} -p${dest_port} -U${dest_superuser} -c\"alter role ${dest_dbowner} createdb\"" >> $log 2>&1
        if [[ $test_run == n ]]; then
              ${BINDIR}/psql -E -e postgres -h${dest_host} -p${dest_port} -U${dest_superuser} -c "alter role ${dest_dbowner} createdb"   >> $log 2>&1
        fi
        echo "" >> $log
        echo "" >> $log
 
        echo "# Create database..." >> $log
        echo "${BINDIR}/psql -E -e postgres -h${dest_host} -p${dest_port} -U${dest_dbowner} -c\"create database ${dest_database}\"" >> $log 2>&1
        if [[ $test_run == n ]]; then
              ${BINDIR}/psql -E -e postgres -h${dest_host} -p${dest_port} -U${dest_dbowner} -c "create database ${dest_database}"   >> $log 2>&1
        fi
        echo "" >> $log
        echo "" >> $log
        #vi $log; exit 99;
 
else
 
        echo "# Create schema..." >> $log
        echo "${BINDIR}/psql -E -e -h${dest_host} -p${dest_port} ${dest_database} -U${dest_dbowner} -c\"create schema ${source_schema}\"" >> $log 2>&1
        if [[ $test_run == n ]]; then
              ${BINDIR}/psql -E -e -h${dest_host} -p${dest_port} ${dest_database} -U${dest_dbowner} -c "create schema ${source_schema}"   >> $log 2>&1
        fi
        echo "" >> $log
        echo "" >> $log
        #vi $log; exit 99;
 
fi
 
echo "# Restore database..." >> $log
echo "${BINDIR}/pg_restore -v -d ${dest_database} -h${dest_host} -p${dest_port} -U ${dest_dbowner} -j ${dest_jobs} -Fd ${backup_dir} ${sql_schema} ${sql_schema_only} ${sql_no_owner} ${sql_no_privileges}" >> $log 2>&1
if [[ $test_run == n ]]; then
      ${BINDIR}/pg_restore -v -d ${dest_database} -h${dest_host} -p${dest_port} -U ${dest_dbowner} -j ${dest_jobs} -Fd ${backup_dir} ${sql_schema} ${sql_schema_only} ${sql_no_owner} ${sql_no_privileges}  >> $log 2>&1
fi
echo "" >> $log
echo "" >> $log
echo "$(date +'%m-%d-%Y %T') - completed database restore..." >> $log
echo "" >> $log
echo "" >> $log
 
if [[ $source_schema != n ]]; then
        ${BINDIR}/psql -h${dest_host} -p${dest_port} ${dest_database} -U${dest_dbowner} -c "\dn+ ${source_schema}"   >> $log 2>&1
        ${BINDIR}/psql -h${dest_host} -p${dest_port} ${dest_database} -U${dest_dbowner} -c "\dt+ ${source_schema}.*" >> $log 2>&1
fi
echo "" >> $log
echo "" >> $log
echo "" >> $log
echo "" >> $log
 
echo "$(date +'%m-%d-%Y %T') - DURATION: END" >> $log
vi $log

Fase 3:esegui un test di esecuzione per tutti gli schemi e i comandi di revisione

Per prepararti adeguatamente alla migrazione, raccogli tutti i dettagli su cosa eseguire esattamente il backup e cosa ripristinare. Questi dati serviranno come parametri da passare nello script della shell sopra. In questo esempio, migreremo un database completo inclusi tutti i suoi schemi passando i seguenti parametri:

Parametri Comando (valori parametro)
psql_version=$1
source_host=$2
source_port=$3
source_database=$4
source_schema=$5
source_dbowner =$6
source_superuser=$7
source_jobs=$8
dest_host=$9
dest_port=${10}
dest_database=${11}
dest_dbowner=$ {12}
dest_superuser=${13}
dest_jobs=${14}
schema_only=${15}
no_owner=${16}
no_privileges=$ {17}
backup_dir=${18}/${psql_version}/${source_database}
test_run=${19}		 /opt/dba/migrate/migrateDB_parallel.sh \
10 \
onpremdbserver.domain.com \
5432 \
source_database \
n \
source_appuser \
postgres \
100 \
dest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com \
5432 \
dest_database_newdb \
dest_rds_superuser \
dest_rds_superuser \
120 \
n \
y \
y \
"/dbbackup" \
Y

Assicurati di rivedere i comandi prima dell'esecuzione

05-24-2019 22:14:08 - DURATION: BEGIN
  
 - psql_version:        10
                                    
 - source_host:        onpremdbserver.domain.com
 - source_port:        5432
 - source_database:        source_database
 - source_schema:        n
 - source_dbowner:        source_appuser
 - source_superuser:        postgres
 - source_jobs:        100
                                    
 - dest_host:            dest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com
 - dest_port:            5432
 - dest_database:        dest_database_newdb
 - dest_dbowner:        dest_rds_superuser
 - dest_superuser:        dest_rds_superuser
 - dest_jobs:            120
                                    
 - schema_only:        n
 - no_owner:            y
 - no_privileges:        y
                                    
 - sql_schema_only:               
 - sql_schema:                    
 - sql_no_owner:        --no-owner
 - sql_no_privileges:        --no-privileges
                                    
 - test_run:            y
                                    
 - BINDIR:            /usr/pgsql-10/bin
 - backup_dir:            /dbbackup/10/source_database
 - log_file:            /var/log/postgres/migrate/source_database_05242019.log
  
 
######################################################################################################
05-24-2019 22:14:08 - beginning database backup...
  
# Gather onpremdbserver.domain.com:source_database db size...
                                                        List of databases
      Name       |     Owner      | Encoding |   Collate   |    Ctype    | Access privileges |  Size   | Tablespace | Description
-----------------+----------------+----------+-------------+-------------+-------------------+---------+------------+-------------
 source_database | source_appuser | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 7992 kB | pg_default |
(1 row)
 
  
# Refresh directories...
mkdir -p /dbbackup/10/source_database
rm    -f /dbbackup/10/source_database/*
 
 
# Backup database...
/usr/pgsql-10/bin/pg_dump -v source_database -h onpremdbserver.domain.com -p 5432 -U source_appuser -Fd -j 100 -f /dbbackup/9.6/source_database   --no-owner --no-privileges
  
05-24-2019 22:14:09 - completed database backup...
 
  
######################################################################################################
05-24-2019 22:14:09 - beginning database restore...
  
# Grant dest_rds_superuser createdb...
/usr/pgsql-9.6/bin/psql -E -e postgres -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 -Udest_rds_superuser -c"alter role dest_rds_superuser createdb"
  
# Create database...
/usr/pgsql-9.6/bin/psql -E -e postgres -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 -Udest_rds_superuser -c"create database dest_database_newdb"
  
# Restore database...
/usr/pgsql-9.6/bin/pg_restore -v -d dest_database_newdb -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 -U dest_rds_superuser -j 120 -Fd /dbbackup/9.6/source_database   --no-owner --no-privileges
  
05-24-2019 22:14:09 - completed database restore...

Fase 4:esegui lo script (tutti gli schemi)

Nota:passa "n" per tutti gli schemi:

Parametri Comando (valori parametro)
psql_version=$1
source_host=$2
source_port=$3
source_database=$4
source_schema=$5
source_dbowner =$6
source_superuser=$7
source_jobs=$8
dest_host=$9
dest_port=${10}
dest_database=${11}
dest_dbowner=$ {12}
dest_superuser=${13}
dest_jobs=${14}
schema_only=${15}
no_owner=${16}
no_privileges=$ {17}
backup_dir=${18}/${psql_version}/${source_database}
test_run=${19}		 /opt/dba/migrate/migrateDB_parallel.sh \
10 \
onpremdbserver.domain.com \
5432 \
source_database \
n \
source_appuser \
postgres \
100 \
dest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com \
5432 \
dest_database_newdb \
dest_rds_superuser \
dest_rds_superuser \
120 \
n \
y \
y \
"/dbbackup" \
Y

Uscita

05-24-2019 23:16:40 - DURATION: BEGIN
 
 - psql_version:              10    
 - source_host:               onpremdbserver.domain.com
 - source_port:               5432
 - source_database:           source_database
 - source_schema:        n
 - source_dbowner:            source_appuser
 - source_superuser:          postgres
 - source_jobs:               100
                                    
 - dest_host:            dest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com
 - dest_port:            5432
 - dest_database:             dest_database_newdb
 - dest_dbowner:              dest_rds_superuser
 - dest_superuser:            dest_rds_superuser
 - dest_jobs:                 120
                                    
 - schema_only:               n
 - no_owner:                  y
 - no_privileges:             y
                                    
 - sql_schema_only:               
 - sql_schema:                    
 - sql_no_owner:              --no-owner
 - sql_no_privileges:         --no-privileges
                                    
 - test_run:                  n
                                    
 - BINDIR:            /usr/pgsql-10/bin
 - backup_dir:                /dbbackup/10/source_database
 - log_file:                  /var/log/postgres/migrate/source_database_05242019.log
 
  
######################################################################################################
05-24-2019 23:16:40 - beginning database backup...
 
 # Gather onpremdbserver.domain.com db size...
                                                        List of databases
      Name       |     Owner      | Encoding |   Collate   |    Ctype    | Access privileges |  Size   | Tablespace | Description
-----------------+----------------+----------+-------------+-------------+-------------------+---------+------------+-------------
 source_database | source_appuser | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 7992 kB | pg_default |
(1 row)
  
# Refresh directories...
mkdir -p /dbbackup/10/source_database
rm    -f /dbbackup/10/source_database/*
 
 # Backup database...
/usr/pgsql-10/bin/pg_dump -v source_database -h onpremdbserver.domain.com -p 5432 -U source_appuser -Fd -j 100 -f /dbbackup/10/source_database   --no-owner --no-privileges
pg_dump: last built-in OID is 16383
pg_dump: reading extensions
pg_dump: identifying extension members
pg_dump: reading schemas
pg_dump: reading user-defined tables
pg_dump: reading user-defined functions
pg_dump: reading user-defined types
pg_dump: reading procedural languages
pg_dump: reading user-defined aggregate functions
pg_dump: reading user-defined operators
pg_dump: reading user-defined access methods
pg_dump: reading user-defined operator classes
pg_dump: reading user-defined operator families
pg_dump: reading user-defined text search parsers
pg_dump: reading user-defined text search templates
pg_dump: reading user-defined text search dictionaries
pg_dump: reading user-defined text search configurations
pg_dump: reading user-defined foreign-data wrappers
pg_dump: reading user-defined foreign servers
pg_dump: reading default privileges
pg_dump: reading user-defined collations
pg_dump: reading user-defined conversions
pg_dump: reading type casts
pg_dump: reading transforms
pg_dump: reading table inheritance information
pg_dump: reading event triggers
pg_dump: finding extension tables
pg_dump: finding inheritance relationships
pg_dump: reading column info for interesting tables
pg_dump: finding the columns and types of table "source_schema.table1"
pg_dump: finding the columns and types of table "source_schema.table2"
pg_dump: finding the columns and types of table "source_schema.table3"
pg_dump: finding default expressions of table "source_schema.table3"
pg_dump: flagging inherited columns in subtables
pg_dump: reading indexes
pg_dump: reading extended statistics
pg_dump: reading constraints
pg_dump: reading triggers
pg_dump: reading rewrite rules
pg_dump: reading policies
pg_dump: reading row security enabled for table "source_schema.table1"
pg_dump: reading policies for table "source_schema.table1"
pg_dump: reading row security enabled for table "source_schema.table2"
pg_dump: reading policies for table "source_schema.table2"
pg_dump: reading row security enabled for table "source_schema.table3_id_seq"
pg_dump: reading policies for table "source_schema.table3_id_seq"
pg_dump: reading row security enabled for table "source_schema.table3"
pg_dump: reading policies for table "source_schema.table3"
pg_dump: reading publications
pg_dump: reading publication membership
pg_dump: reading publication membership for table "source_schema.table1"
pg_dump: reading publication membership for table "source_schema.table2"
pg_dump: reading publication membership for table "source_schema.table3"
pg_dump: reading subscriptions
pg_dump: reading large objects
pg_dump: reading dependency data
pg_dump: saving encoding = UTF8
pg_dump: saving standard_conforming_strings = on
pg_dump: saving search_path =
pg_dump: saving database definition
pg_dump: dumping contents of table "source_schema.table3"
pg_dump: finished item 3800 TABLE DATA table3
pg_dump: dumping contents of table "source_schema.table1"
pg_dump: finished item 3797 TABLE DATA table1
pg_dump: dumping contents of table "source_schema.table2"
pg_dump: finished item 3798 TABLE DATA table2
  
05-24-2019 23:16:41 - completed database backup...
   ######################################################################################################
05-24-2019 23:16:41 - beginning database restore...
  
# Grant dest_rds_superuser createdb...
/usr/pgsql-10/bin/psql -E -e postgres -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 -Udest_rds_superuser -c"alter role dest_rds_superuser createdb"
alter role dest_rds_superuser createdb
ALTER ROLE
  
# Create database...
/usr/pgsql-10/bin/psql -E -e postgres -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 -Udest_rds_superuser -c"create database dest_database_newdb"
create database dest_database_newdb
CREATE DATABASE
  
# Restore database...
/usr/pgsql-10/bin/pg_restore -v -d dest_database_newdb -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 -U dest_rds_superuser -j 120 -Fd /dbbackup/10/source_database   --no-owner --no-privileges
pg_restore: connecting to database for restore
pg_restore: processing item 3803 ENCODING ENCODING
pg_restore: processing item 3804 STDSTRINGS STDSTRINGS
pg_restore: processing item 3805 SEARCHPATH SEARCHPATH
pg_restore: processing item 3806 DATABASE source_database
pg_restore: processing item 3 SCHEMA public
pg_restore: creating SCHEMA "public"
pg_restore: processing item 3807 COMMENT SCHEMA public
pg_restore: creating COMMENT "SCHEMA public"
pg_restore: processing item 6 SCHEMA source_schema
pg_restore: creating SCHEMA "source_schema"
pg_restore: processing item 1 EXTENSION plpgsql
pg_restore: creating EXTENSION "plpgsql"
pg_restore: processing item 3808 COMMENT EXTENSION plpgsql
pg_restore: creating COMMENT "EXTENSION plpgsql"
pg_restore: [archiver (db)] Error while PROCESSING TOC:
pg_restore: [archiver (db)] Error from TOC entry 3808; 0 0 COMMENT EXTENSION plpgsql
pg_restore: [archiver (db)] could not execute query: ERROR:  must be owner of extension plpgsql
    Command was: COMMENT ON EXTENSION plpgsql IS 'PL/pgSQL procedural language';
 
 
 
pg_restore: processing item 197 TABLE table1
pg_restore: creating TABLE "source_schema.table1"
pg_restore: processing item 198 TABLE table2
pg_restore: creating TABLE "source_schema.table2"
pg_restore: processing item 200 TABLE table3
pg_restore: creating TABLE "source_schema.table3"
pg_restore: processing item 199 SEQUENCE table3_id_seq
pg_restore: creating SEQUENCE "source_schema.table3_id_seq"
pg_restore: processing item 3809 SEQUENCE OWNED BY table3_id_seq
pg_restore: creating SEQUENCE OWNED BY "source_schema.table3_id_seq"
pg_restore: processing item 3675 DEFAULT table3 id
pg_restore: creating DEFAULT "source_schema.table3 id"
pg_restore: entering main parallel loop
pg_restore: launching item 3797 TABLE DATA table1
pg_restore: launching item 3798 TABLE DATA table2
pg_restore: launching item 3800 TABLE DATA table3
pg_restore: launching item 3810 SEQUENCE SET table3_id_seq
pg_restore: processing data for table "source_schema.table2"
pg_restore: executing SEQUENCE SET table3_id_seq
pg_restore: finished item 3810 SEQUENCE SET table3_id_seq
pg_restore: processing data for table "source_schema.table1"
pg_restore: processing data for table "source_schema.table3"
pg_restore: finished item 3797 TABLE DATA table1
pg_restore: finished item 3798 TABLE DATA table2
pg_restore: finished item 3800 TABLE DATA table3
pg_restore: finished main parallel loop
WARNING: errors ignored on restore: 1
  
05-24-2019 23:16:43 - completed database restore...
  
05-24-2019 23:16:43 - DURATION: END

Passaggio 5:eseguire un test di esecuzione per lo schema

Parametri Comando (valori parametro)
psql_version=$1
source_host=$2
source_port=$3
source_database=$4
source_schema=$5
source_dbowner =$6
source_superuser=$7
source_jobs=$8
dest_host=$9
dest_port=${10}
dest_database=${11}
dest_dbowner=$ {12}
dest_superuser=${13}
dest_jobs=${14}
schema_only=${15}
no_owner=${16}
no_privileges=$ {17}
backup_dir=${18}/${psql_version}/${source_database}
test_run=${19}		 /opt/dba/migrate/migrateDB_parallel.sh \
10 \
onpremdbserver.domain.com \
5432 \
source_database \
source_schema \
source_appuser \
postgres \
100 \
dest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com \
5432 \
dest_database_newdb \
dest_rds_superuser \
dest_rds_superuser \
120 \
n \
y \
y \
"/dbbackup" \
e

Ancora una volta, assicurati di rivedere i comandi prima dell'esecuzione

05-24-2019 22:50:48 - DURATION: BEGIN
  
 - psql_version:        10
                                    
 - source_host:               onpremdbserver.domain.com
 - source_port:               5432
 - source_database:           source_database
 - source_schema:        source_schema
 - source_dbowner:        source_appuser
 - source_superuser:          postgres
 - source_jobs:               100
                                    
 - dest_host:                 dest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com
 - dest_port:                 5432
 - dest_database:             dest_database_newdb
 - dest_dbowner:              dest_rds_superuser
 - dest_superuser:            dest_rds_superuser
 - dest_jobs:                 120
                                    
 - schema_only:               n
 - no_owner:                  y
 - no_privileges:             y
                                    
 - sql_schema_only:               
 - sql_schema:                --schema=source_schema
 - sql_no_owner:              --no-owner
 - sql_no_privileges:         --no-privileges
                                    
 - test_run:                  y
                                    
 - BINDIR:                    /usr/pgsql-10/bin
 - backup_dir:                /dbbackup/10/source_database
 - log_file:            /var/log/postgres/migrate/source_database_source_schema_05242019.log
 
  
######################################################################################################
05-24-2019 22:50:48 - beginning database backup...
  
# Gather onpremdbserver.domain.com:source_database.source_schema schema size...
  schema_name  | diskspace  |        percent         
---------------+------------+------------------------
 source_schema | 8192 bytes | 0.10010060159337380900
(1 row)
 
 
# Refresh directories...
mkdir -p /dbbackup/10/source_database
rm    -f /dbbackup/10/source_database/*
  
# Backup database...
/usr/pgsql-10/bin/pg_dump -v source_database -h onpremdbserver.domain.com -p 5432 -U source_appuser -Fd -j 100 -f /dbbackup/10/source_database --schema=source_schema  --no-owner --no-privileges
  
05-24-2019 22:50:49 - completed database backup...
  
######################################################################################################
05-24-2019 22:50:49 - beginning database restore...
  
# Create schema...
/usr/pgsql-10/bin/psql -E -e -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 dest_database_newdb -Udest_rds_superuser -c"create schema source_schema"
  
# Restore database...
/usr/pgsql-10/bin/pg_restore -v -d dest_database_newdb -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 -U dest_rds_superuser -j 120 -Fd /dbbackup/10/source_database --schema=source_schema  --no-owner --no-privileges
  
05-24-2019 22:50:49 - completed database restore...
  
                           List of schemas
     Name      |       Owner        | Access privileges | Description
---------------+--------------------+-------------------+-------------
 source_schema | dest_rds_superuser |                   |
(1 row)
 
                               List of relations
    Schema     |  Name  | Type  |       Owner        |    Size    | Description
---------------+--------+-------+--------------------+------------+-------------
 source_schema | table1 | table | dest_rds_superuser | 0 bytes    |
 source_schema | table2 | table | dest_rds_superuser | 0 bytes    |
 source_schema | table3 | table | dest_rds_superuser | 8192 bytes |
(3 rows)
 
 
 
05-24-2019 22:50:49 - DURATION: END

Passaggio 6:esegui lo script (uno schema)

Parametri Comando (valori parametro)
psql_version=$1
source_host=$2
source_port=$3
source_database=$4
source_schema=$5
source_dbowner =$6
source_superuser=$7
source_jobs=$8
dest_host=$9
dest_port=${10}
dest_database=${11}
dest_dbowner=$ {12}
dest_superuser=${13}
dest_jobs=${14}
schema_only=${15}
no_owner=${16}
no_privileges=$ {17}
backup_dir=${18}/${psql_version}/${source_database}
test_run=${19}		 /opt/dba/migrate/migrateDB_parallel.sh \
10 \
onpremdbserver.domain.com \
5432 \
source_database \
source_schema \
source_appuser \
postgres \
100 \
dest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com \
5432 \
dest_database_newdb \
dest_rds_superuser \
dest_rds_superuser \
120 \
n \
y \
y \
"/dbbackup" \
n

Nota:passa "source_schema" per il nome dello schema

Esamina i comandi prima dell'esecuzione

05-24-2019 23:22:13 - DURATION: BEGIN
  
 - psql_version:              10
                                    
 - source_host:               onpremdbserver.domain.com
 - source_port:            5432
 - source_database:           source_database
 - source_schema:             source_schema
 - source_dbowner:            source_appuser
 - source_superuser:          postgres
 - source_jobs:               100
                                    
 - dest_host:                 dest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com
 - dest_port:                 5432
 - dest_database:             dest_database_newdb
 - dest_dbowner:              dest_rds_superuser
 - dest_superuser:            dest_rds_superuser
 - dest_jobs:                 120
                                    
 - schema_only:               n
 - no_owner:                  y
 - no_privileges:             y
                                    
 - sql_schema_only:               
 - sql_schema:                --schema=source_schema
 - sql_no_owner:        --no-owner
 - sql_no_privileges:        --no-privileges
                                    
 - test_run:                  n
                                    
 - BINDIR:                    /usr/pgsql-10/bin
 - backup_dir:                /dbbackup/10/source_database
 - log_file:            /var/log/postgres/migrate/source_database_source_schema_05242019.log
 
 
######################################################################################################
05-24-2019 23:22:13 - beginning database backup...
 
 
# Gather onpremdbserver.domain.com:source_database.source_schema schema size...
  schema_name  | diskspace  |        percent         
---------------+------------+------------------------
 source_schema | 8192 bytes | 0.10010060159337380900
(1 row)
 
 
# Refresh directories...
mkdir -p /dbbackup/10/source_database
rm    -f /dbbackup/10/source_database/*
  
# Backup database...
/usr/pgsql-10/bin/pg_dump -v source_database -h onpremdbserver.domain.com -p 5432 -U source_appuser -Fd -j 100 -f /dbbackup/10/source_database --schema=source_schema  --no-owner --no-privileges
pg_dump: last built-in OID is 16383
pg_dump: reading extensions
pg_dump: identifying extension members
pg_dump: reading schemas
pg_dump: reading user-defined tables
pg_dump: reading user-defined functions
pg_dump: reading user-defined types
pg_dump: reading procedural languages
pg_dump: reading user-defined aggregate functions
pg_dump: reading user-defined operators
pg_dump: reading user-defined access methods
pg_dump: reading user-defined operator classes
pg_dump: reading user-defined operator families
pg_dump: reading user-defined text search parsers
pg_dump: reading user-defined text search templates
pg_dump: reading user-defined text search dictionaries
pg_dump: reading user-defined text search configurations
pg_dump: reading user-defined foreign-data wrappers
pg_dump: reading user-defined foreign servers
pg_dump: reading default privileges
pg_dump: reading user-defined collations
pg_dump: reading user-defined conversions
pg_dump: reading type casts
pg_dump: reading transforms
pg_dump: reading table inheritance information
pg_dump: reading event triggers
pg_dump: finding extension tables
pg_dump: finding inheritance relationships
pg_dump: reading column info for interesting tables
pg_dump: finding the columns and types of table "source_schema.table1"
pg_dump: finding the columns and types of table "source_schema.table2"
pg_dump: finding the columns and types of table "source_schema.table3"
pg_dump: finding default expressions of table "source_schema.table3"
pg_dump: flagging inherited columns in subtables
pg_dump: reading indexes
pg_dump: reading extended statistics
pg_dump: reading constraints
pg_dump: reading triggers
pg_dump: reading rewrite rules
pg_dump: reading policies
pg_dump: reading row security enabled for table "source_schema.table1"
pg_dump: reading policies for table "source_schema.table1"
pg_dump: reading row security enabled for table "source_schema.table2"
pg_dump: reading policies for table "source_schema.table2"
pg_dump: reading row security enabled for table "source_schema.table3_id_seq"
pg_dump: reading policies for table "source_schema.table3_id_seq"
pg_dump: reading row security enabled for table "source_schema.table3"
pg_dump: reading policies for table "source_schema.table3"
pg_dump: reading publications
pg_dump: reading publication membership
pg_dump: reading publication membership for table "source_schema.table1"
pg_dump: reading publication membership for table "source_schema.table2"
pg_dump: reading publication membership for table "source_schema.table3"
pg_dump: reading subscriptions
pg_dump: reading dependency data
pg_dump: saving encoding = UTF8
pg_dump: saving standard_conforming_strings = on
pg_dump: saving search_path =
pg_dump: dumping contents of table "source_schema.table1"
pg_dump: dumping contents of table "source_schema.table3"
pg_dump: finished item 3797 TABLE DATA table1
pg_dump: finished item 3800 TABLE DATA table3
pg_dump: dumping contents of table "source_schema.table2"
pg_dump: finished item 3798 TABLE DATA table2
 
 
05-24-2019 23:22:14 - completed database backup...
 
 
######################################################################################################
05-24-2019 23:22:14 - beginning database restore...
 
 # Create schema...
/usr/pgsql-10/bin/psql -E -e -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 dest_database_newdb -Udest_rds_superuser -c"create schema source_schema"
create schema source_schema
CREATE SCHEMA
  
# Restore database...
/usr/pgsql-10/bin/pg_restore -v -d dest_database_newdb -hdest_dbinstance.cluster-awsrdsguid.us-east-1.rds.amazonaws.com -p5432 -U dest_rds_superuser -j 120 -Fd /dbbackup/10/source_database --schema=source_schema  --no-owner --no-privileges
pg_restore: connecting to database for restore
pg_restore: processing item 3803 ENCODING ENCODING
pg_restore: processing item 3804 STDSTRINGS STDSTRINGS
pg_restore: processing item 3805 SEARCHPATH SEARCHPATH
pg_restore: processing item 6 SCHEMA source_schema
pg_restore: processing item 197 TABLE table1
pg_restore: creating TABLE "source_schema.table1"
pg_restore: processing item 198 TABLE table2
pg_restore: creating TABLE "source_schema.table2"
pg_restore: processing item 200 TABLE table3
pg_restore: creating TABLE "source_schema.table3"
pg_restore: processing item 199 SEQUENCE table3_id_seq
pg_restore: creating SEQUENCE "source_schema.table3_id_seq"
pg_restore: processing item 3806 SEQUENCE OWNED BY table3_id_seq
pg_restore: creating SEQUENCE OWNED BY "source_schema.table3_id_seq"
pg_restore: processing item 3675 DEFAULT table3 id
pg_restore: creating DEFAULT "source_schema.table3 id"
pg_restore: entering main parallel loop
pg_restore: launching item 3797 TABLE DATA table1
pg_restore: launching item 3798 TABLE DATA table2
pg_restore: launching item 3800 TABLE DATA table3
pg_restore: launching item 3807 SEQUENCE SET table3_id_seq
pg_restore: pg_restore: processing data for table "source_schema.table2"
processing data for table "source_schema.table3"
pg_restore: executing SEQUENCE SET table3_id_seq
pg_restore: processing data for table "source_schema.table1"
pg_restore: finished item 3807 SEQUENCE SET table3_id_seq
pg_restore: finished item 3798 TABLE DATA table2
pg_restore: finished item 3800 TABLE DATA table3
pg_restore: finished item 3797 TABLE DATA table1
pg_restore: finished main parallel loop
 
 
05-24-2019 23:22:14 - completed database restore...
  
                           List of schemas
     Name      |       Owner        | Access privileges | Description
---------------+--------------------+-------------------+-------------
 source_schema | dest_rds_superuser |                   |
(1 row)
                                List of relations
    Schema     |  Name  | Type  |       Owner        |    Size    | Description
---------------+--------+-------+--------------------+------------+-------------
 source_schema | table1 | table | dest_rds_superuser | 0 bytes    |
 source_schema | table2 | table | dest_rds_superuser | 0 bytes    |
 source_schema | table3 | table | dest_rds_superuser | 8192 bytes |
(3 rows)
 
 
05-24-2019 23:22:14 - DURATION: END

Step 7 — Clean Up

After validating from the end user, remove any older databases and/or schemas. You have now migrated your database from on prem to AWS RDS! In the next part, I will discuss “Common Errors when Migrating PostgreSQL Databases From On-Prem to AWS RDS”.