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#!/bin/sh
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# Configure a postgresql hot standby server
here=`echo "import os; print os.path.realpath('$0')" | python`; here=`dirname $here`
mkdir -p $1
root=`echo "import os; print os.path.realpath('$1')" | python`
# Server address
addr=$2
if [ "$addr" = "" ]; then
ip="*"
port="5432"
else
ip=`$here/../../modules/http/httpd-addr ip $addr`
if [ "$ip" = "" ]; then
ip="*"
fi
port=`$here/../../modules/http/httpd-addr port $addr`
fi
# Master server address
if [ "$3" = "" ]; then
mhost="localhost"
mport="5432"
mhttpport="80"
else
mhost="$3"
mport="$4"
mhttpport="$5"
fi
pgsql_prefix=`cat $here/pgsql.prefix`
mkdir -p $root/sqldb/data
chmod 700 $root/sqldb/data
mkdir -p $root/sqldb/archive
mkdir -p $root/logs
# Initialize from a backup of the master
if [ ! -f $root/sqldb/data/postgresql.conf ]; then
(wget http://$mhost:$mhttpport/pgsql-backup -O - | tar -C $root/sqldb -xz) 1>>$root/logs/postgresql 2>&1
rm -rf $root/sqldb/data/postmaster.pid $root/sqldb/data/pg_xlog
mkdir -p $root/sqldb/data/pg_xlog/archive_status
chmod 700 $root/sqldb/data/pg_xlog/archive_status
fi
# Generate server configuration
cp $root/sqldb/data/postgresql-init.conf $root/sqldb/data/postgresql.conf
cat >>$root/sqldb/data/postgresql.conf <<EOF
# Generated by: standby-conf $*
# Listen
listen_addresses = '$ip'
port = $port
# Setup archival
archive_mode = on
archive_command = 'cp %p $root/sqldb/archive/%f'
# Setup hot standby with streaming replication
wal_level = hot_standby
max_wal_senders = 5
wal_keep_segments = 32
# Enable hot standby
hot_standby = on
EOF
# Generate recovery configuration
cat >$root/sqldb/data/recovery.conf << EOF
# Generated by: pgsql-slave-conf $*
# Start in standby mode
standby_mode = 'on'
primary_conninfo = 'host=$mhost port=$mport'
# Failover
trigger_file = '$root/sqldb/failover'
restore_command = 'wget http://$mhost:$mhttpport/pgsql-archive/%f -O "%p"'
EOF
# Generate database backup script
mkdir -p $root/sqldb/scripts
cat >$root/sqldb/scripts/backup <<EOF
#!/bin/sh
$here/pgsql-backup $root localhost $port
EOF
chmod 700 $root/sqldb/scripts/backup
# Configure HTTPD to serve backup and archive files
if [ -f "$root/conf/httpd.conf" ]; then
cat >>$root/conf/httpd.conf <<EOF
# Generated by: pgsql-conf $*
# Serve PostgreSQL backup and WAL archive files
ScriptAlias /pgsql-backup "$root/sqldb/scripts/backup"
Alias /pgsql-archive "$root/sqldb/archive"
EOF
fi
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