A PostgreSQL BDR step-by-step Debian setup guide. May become a small post someday.

postgres-bdr-setup.md

1. Configure SO locale

export LANGUAGE=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
locale-gen en_US.UTF-8
dpkg-reconfigure locales

2. Install BDR via apt

(Do not install postgresql-9.5! Use postgresql-bdr-9.4 modified version)

sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
sudo sh -c 'echo "deb [arch=amd64] http://packages.2ndquadrant.com/bdr/apt/ $(lsb_release -cs)-2ndquadrant main" > /etc/apt/sources.list.d/2ndquadrant.list'
sudo apt-get install wget ca-certificates
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
wget --quiet -O - http://packages.2ndquadrant.com/bdr/apt/AA7A6805.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install postgresql-bdr-9.4 postgresql-bdr-9.4-bdr-plugin

3. Create db directory, set PATH and initdb

su -l postgres
export PATH=/usr/lib/postgresql/9.4/bin:$PATH
mkdir $HOME/9.4-bdr
initdb -D $HOME/9.4-bdr -A trust

4. Edit $HOME/9.4-bdr/postgresql.conf

listen_addresses = '*'

shared_preload_libraries = 'bdr'
wal_level = 'logical'
track_commit_timestamp = on
max_connections = 100
max_wal_senders = 10
max_replication_slots = 10
max_worker_processes = 10

5. Edit $HOME/9.4-bdr/pg_hba.conf

Master1: 104.236.39.43 Master2: 45.55.182.128

local   replication     postgres                                trust
host    replication     postgres        127.0.0.1/32            trust
host    replication     postgres        ::1/128                 trust

host all all 0.0.0.0/0  password

host replication postgres 104.236.39.43/32 trust
host replication postgres 45.55.182.128/32 trust

host replication bdrsync 104.236.39.43/32 password
host replication bdrsync 45.55.182.128/32 password

6. Stop old config server, start server and create bdr user

pg_ctl -D $HOME/9.4/main stop
pg_ctl -D $HOME/9.4-bdr start
psql -c "CREATE USER bdrsync superuser;"
psql -c "ALTER USER bdrsync WITH PASSWORD '12345#';"

7. Create an unprivileged user and a blank database

createuser amsv2
createdb -O amsv2 amstest
psql amstest -c 'CREATE EXTENSION btree_gist;'
psql amstest -c 'CREATE EXTENSION bdr;'

8. Create group on Master1

psql
\c amstest
SELECT bdr.bdr_group_create(
    local_node_name := 'node1',
    node_external_dsn := 'host=104.236.39.43 user=bdrsync dbname=amstest password=12345#'
);

9. Join group from Master2

psql
\c amstest
SELECT bdr.bdr_group_join(
    local_node_name := 'node2',
    node_external_dsn := 'host=45.55.182.128 user=bdrsync dbname=amstest password=12345#',
    join_using_dsn := 'host=104.236.39.43 user=bdrsync dbname=amstest password=12345#'
);

I encountered error "FATAL: could not access file "btree_gist". Would you please help.

which database do you use ?

Is there any howto for postgres 14? It looks like BDR is behind paywall now, all links are dead and lead to some corporate website.