## Postgresql
Clean config

    cat postgresql.conf.bak | grep -Pv "(^#)|^$" | sed 's/#.*$//g' | sed '/^\s*$/d'

Add path to postgres

    echo 'pathmunge /usr/pgsql-9.6/bin/' > /etc/profile.d/postgres.sh
    . /etc/profile

    Minimal postgres 9.6 config
    max_connections = 100
    shared_buffers = 128MB
    dynamic_shared_memory_type = posix
    log_destination = 'stderr'
    logging_collector = on
    log_directory = 'pg_log'
    log_filename = 'postgresql-%a.log'
    log_truncate_on_rotation = on
    log_rotation_age = 1d
    log_rotation_size = 0
    log_line_prefix = '< %m > '
    log_timezone = 'W-SU'
    datestyle = 'iso, mdy'
    timezone = 'W-SU'
    lc_messages = 'en_US.UTF-8'
    lc_monetary = 'en_US.UTF-8'
    lc_numeric = 'en_US.UTF-8'
    lc_time = 'en_US.UTF-8'
    default_text_search_config = 'pg_catalog.english'
    listen_addresses = '*'
    #replication
    wal_level = hot_standby
    wal_log_hints = on
    max_wal_senders = 8
    wal_keep_segments = 64
    hot_standby = on

minimal recovery.conf

    standby_mode = 'on'
    primary_conninfo = 'user=postgres host=master port=5432 sslmode=prefer sslcompression=1 krbsrvname=postgres'

pg_basebackup

    pg_basebackup -P -X stream -R -D data/ -h master