1 <?xml version='1.0' encoding='UTF-8'?>
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2 <chapter xmlns="http://docbook.org/ns/docbook" xmlns:xi="http://www.w3.org/2001/XInclude"
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3 xmlns:xl="http://www.w3.org/1999/xlink" version="5.0" xml:id="adminmisc">
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6 <title>Server Operations and Maintenance</title>
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7 <indexterm><primary>receipt template editor</primary></indexterm>
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9 <para>This chapter deals with basic server operations such as starting and stopping <application>Evergreen</application> as well wall
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10 security, backing up and troubleshooting <application>Evergreen</application>.</para>
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13 <section xml:id="startingopensrf">
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14 <title>Starting, Stopping and Restarting</title>
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15 <para>Occasionally, you may need to restart <application>Evergreen</application>. It is imperative that you understand the basic
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16 commands to stop and start the <application>Evergreen</application> server. You can start and stop <application>Evergreen</application> from the command line of
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17 the server using the <command>osrf_ctl.sh</command> script located in the
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18 <filename class="directory">openils/bin</filename> directory.</para>
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19 <note><para><command>The osrf_ctl.sh</command> command must be run as the <systemitem class="username">opensrf</systemitem> user.</para></note>
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20 <para>To view help on <command>osrf_ctl.sh</command> and get all of its options, run:</para>
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21 <screen><userinput>osrf_ctl.sh -h</userinput></screen>
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22 <para>To start Evergreen, run:</para>
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23 <screen><userinput>osrf_ctl.sh -l -a start_all</userinput></screen>
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24 <para>The <option>-l</option> flag is used to indicate that Evergreen is configured to use <systemitem class="domainname">localhost</systemitem> as
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25 the host. If you have configured <filename>opensrf.xml</filename> to use your real hostname, do not use the <option>-l</option> flag. The <option>-a</option>
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26 option is required and indicates the <emphasis>action</emphasis> of the command. In this case
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27 <option>start_all</option>.
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30 <para>If you receive the error message: <errortext>osrf_ctl.sh: command not found</errortext>, then your environment variable
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31 <varname>PATH</varname><indexterm><primary>environment variable</primary><secondary>PATH</secondary></indexterm> does not include the
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32 <filename class="directory">/openils/bin</filename> directory. You can set it using the following command:</para>
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33 <screen><userinput>export <varname>PATH</varname>=$PATH:<filename class="directory">/openils/bin</filename></userinput></screen>
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34 <para>If you receive the error message <errortext>Can't locate OpenSRF/System.pm in @INC … BEGIN
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35 failed–compilation aborted</errortext>, then your environment variable <varname>PERL5LIB</varname><indexterm><primary>environment
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36 variable</primary><secondary>PERL5LIB</secondary></indexterm> does not
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37 include the <filename class="directory">/openils/lib/perl5</filename> directory. You can set it
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38 using the following command:</para>
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39 <screen><userinput>export <varname>PERL5LIB</varname>=$PERL5LIB:<filename class="directory">/openils/lib/perl5</filename></userinput></screen>
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41 <para>It is also possible to start a specific service. For example:</para>
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42 <screen><userinput>osrf_ctl.sh -l -a start_router</userinput></screen>
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43 <para>will only start the <systemitem class="service">router</systemitem> service.</para>
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45 <para>If you decide to start each service individually, you need to start them in a specific order
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46 for Evergreen to start correctly. Run the commands in this exact order:</para>
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47 <screen><userinput>osrf_ctl.sh -l -a start_router</userinput></screen>
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48 <screen><userinput>osrf_ctl.sh -l -a start_perl</userinput></screen>
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49 <screen><userinput>osrf_ctl.sh -l -a start_c</userinput></screen>
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51 <para>After starting or restarting Evergreen, it is also necessary to restart the <systemitem class="service">Apache web server</systemitem>
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52 <indexterm><primary>web server</primary><secondary>Apache</secondary></indexterm> for the OPAC to work correctly.</para>
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53 <para>To stop <application>Evergreen</application>, run:</para>
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54 <screen><userinput>osrf_ctl.sh -l -a stop_all</userinput></screen>
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55 <para>As with starting, you can choose to stop services individually.</para>
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56 <para>To restart <application>Evergreen</application>, run:</para>
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57 <screen><userinput>osrf_ctl.sh -l -a restart_all</userinput></screen>
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59 <title>Starting Specific Perl Services</title>
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60 <para>It is also possible to start and stop a specific perl service using <filename>opensrf-perl.pl</filename>. Here is the syntax for starting a perl service with this command:</para>
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61 <screen><userinput>opensrf-perl.pl --service <systemitem class="service"><service-name></systemitem> -a start -p <filename class="directory"><PID-directory></filename> </userinput></screen>
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62 <para>Example (starting the booking module):</para>
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63 <screen><userinput>opensrf-perl.pl --service <systemitem class="service">open-ils.booking</systemitem> -a start -p <filename class="directory">/openils/var/run/opensrf</filename></userinput></screen>
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65 <para>This is the syntax for stopping a perl service with this command:</para>
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66 <screen><userinput>opensrf-perl.pl --service <systemitem class="service"><service-name></systemitem> -a stop -p <filename class="directory"><PID-directory></filename> </userinput></screen>
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67 <para>Example (stopping the booking module):</para>
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68 <screen><userinput>opensrf-perl.pl --service <systemitem class="service">open-ils.booking</systemitem> -a stop -p <filename class="directory">/openils/var/run/opensrf</filename></userinput></screen>
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69 <para>These commands can be very useful when you edit Perl modules and only need to restart the specific service for changes to take effect.</para>
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72 <para>The default for the PID-directory: <filename class="directory">/openils/var/run/opensrf</filename></para>
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73 <para>For a clustered server instance of Evergreen, you must store the PIDs on a directory
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74 that is local to each server, or else one of your cluster servers may try killing processes on itself that actually have PIDs on other servers.</para>
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75 <para>For services running on the local server use the <option>--localhost</option> to force the hostname to be <systemitem class="domainname">localhost</systemitem>,
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76 instead of the fully qualified domain name for the machine.</para>
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77 <para>To see other options run the command with the <option>-h</option> option:</para>
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78 <screen><userinput>opensrf-perl.pl -h</userinput></screen>
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80 <para>For a list of Evergreen/OpenSRF perl services see: <xref linkend="_evergreen_specific_opensrf_services"/>.</para>
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83 <section xml:id="evergreen_startup_script">
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84 <title>Automating Evergreen Startup and Shutdown</title>
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85 <para>Once you understand starting and stopping Evergreen, you will want to create a start up script for two purposes:</para>
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87 <listitem>Allow you to start, restart and stop Evergreen, SIP, reporter and z39.50 services with one command.</listitem>
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88 <listitem>Allow Evergreen to stop and start properly during a system restart.</listitem>
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90 <para>The following procedure is for Debian or Ubuntu distributions of Linux.</para>
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93 <para>Create a bash script for starting Evergreen and all associated services. Here is an example script:</para>
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101 OPENILS_BASE="/openils"
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102 OPENILS_CORE="${OPENILS_BASE}/conf/opensrf_core.xml"
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103 SRU_LOG="${OPENILS_BASE}/var/log/sru.log"
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105 SIP_PID="${OPENILS_BASE}/var/run"
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106 SIP_CONF="${OPENILS_BASE}/conf/oils_sip.xml"
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108 REP_LOCK="${OPENILS_BASE}/var/lock/reporter-LOCK"
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109 REP_NAME="Clark Kent, waiting for trouble"
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111 sru_name='simple2zoom'
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113 if [ $(whoami) != 'opensrf' ]; then
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114 PERL5LIB='/openils/lib/perl5:$PERL5LIB';
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119 echo "Starting Evergreen"
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120 sudo -u opensrf /bin/bash -c "PERL5LIB=${PERL5LIB}:${OPENILS_BASE}/lib/perl5 PATH=${PATH}:${OPENILS_BASE}/bin osrf_ctl.sh -l -a start_all"
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124 echo "Stopping Evergreen"
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125 sudo -u opensrf /bin/bash -c "PERL5LIB=${PERL5LIB}:${OPENILS_BASE}/lib/perl5 PATH=${PATH}:${OPENILS_BASE}/bin osrf_ctl.sh -l -a stop_all"
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129 echo "Running Autogen Update"
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130 sudo -u opensrf /bin/bash -c "PERL5LIB=${PERL5LIB}:${OPENILS_BASE}/lib/perl5 PATH=${PATH}:${OPENILS_BASE}/bin autogen.sh -u -c ${OPENILS_CORE}"
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134 sudo -u opensrf /bin/bash -c "PERL5LIB=${PERL5LIB}:${OPENILS_BASE}/lib/perl5 PATH=${PATH}:${OPENILS_BASE}/bin oils_ctl.sh \
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141 sudo -u opensrf /bin/bash -c "PERL5LIB=${PERL5LIB}:${OPENILS_BASE}/lib/perl5 PATH=${PATH}:${OPENILS_BASE}/bin oils_ctl.sh \
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148 sudo -u opensrf /bin/bash -c "PERL5LIB=${PERL5LIB}:${OPENILS_BASE}/lib/perl5 PATH=${PATH}:${OPENILS_BASE}/bin oils_ctl.sh \
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155 pids="$(pidof "$REP_NAME")"
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156 if [ ! x"$pids" = x ] ; then
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157 echo FAILURE ; echo $"Starting Reporting: already running as $pids"
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161 sudo -u opensrf bash -c "PERL5LIB=${PERL5LIB}:${OPENILS_BASE}/lib/perl5 PATH=${PATH}:${OPENILS_BASE}/bin clark-kent.pl \
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162 --lockfile=${REP_LOCK} --boostrap=${OPENILS_CORE} --concurrency=1 --sleep=30 --daemon" ;
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163 pids="$(pidof "$REP_NAME")"
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164 if [ x"$pids" = x ] ; then
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169 echo "Starting Reporting: $pids"
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174 pids="$(pidof "$REP_NAME")"
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175 if [ x"$pids" = x ] ; then
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176 echo FAILURE ; echo $"Stopping Reporting: not running" ; RETVAL=1
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178 kill $pids ; RETVAL=$?
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179 if [ $RETVAL ] ; then
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180 echo OK ; echo $"Stopping Reporting: $pids"
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190 pids=`ps -eo pid,args | grep $sru_name | grep -v grep | cut -c1-6`
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191 if [ ! x"$pids" = x ] ; then
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192 echo FAILURE ; echo $"Starting Z39.50/SRU: already running as $pids"
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195 sudo -u opensrf bash -c "touch ${SRU_LOG}"
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196 sudo bash -c "PERL5LIB=${PERL5LIB}:${OPENILS_BASE}/lib/perl5 PATH=${PATH}:${OPENILS_BASE}/bin z39_50.sh >> ${SRU_LOG} 2>&1" &
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198 pids=`ps -eo pid,args | grep $sru_name | grep -v grep | cut -c1-6`
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199 if [ x"$pids" = x ] ; then
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204 echo "Starting Z39.50/SRU: $pids"
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209 pids=`ps -eo pid,args | grep $sru_name | grep -v grep | cut -c1-6`
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210 if [ x"$pids" = x ] ; then
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211 echo FAILURE ; echo $"Stopping Z39.50/SRU: not running" ; RETVAL=1
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213 kill $pids ; RETVAL=$?
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214 if [ $RETVAL ] ; then
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215 echo OK ; echo $"Stopping Z39.50/SRU: $pids"
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237 echo "Restarting Evergreen, Reporter and Z39.50 Processes"
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279 start_router|stop_router|restart_router|start_perl|stop_perl|restart_perl| \
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280 start_c|stop_c|restart_c|start_osrf|stop_osrf|restart_osrf|stop_all|start_all|restart_all)
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281 sudo -u opensrf /bin/bash -c "PERL5LIB=${PERL5LIB}:${OPENILS_BASE}/lib/perl5 PATH=${PATH}:${OPENILS_BASE}/bin osrf_ctl.sh -l -a $1"
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284 echo " * Usage: /etc/init.d/evergreen {start|stop|restart|autogen"
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285 echo " |sip_start|sip_stop|sip_restart"
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286 echo " |z39_50_start|z39_50_stop|z39_50_restart"
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287 echo " |start_reporter|stop_reporter|restart_reporter"
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288 echo " |start_router|stop_router|restart_router|start_perl|stop_perl|restart_perl"
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289 echo " |start_c|stop_c|restart_c|start_osrf|stop_osrf|restart_osrf|stop_all|start_all|restart_all}"
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297 <para>Save file in <filename>/etc/init.d</filename> folder.</para>
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300 <para>Ensure that it is executable.</para>
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301 <screen><userinput>sudo chmod 755 evergreenstart </userinput></screen>
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304 <para>Test the script by running it from the command line as the <systemitem class="username">root</systemitem> user.</para>
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305 <screen><userinput>/etc/init.d/evergreenstart restart</userinput></screen>
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306 <para>You will also need to restart apache as the <systemitem class="username">root</systemitem> user.</para>
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307 <screen><userinput>/etc/init.d/apache2 restart</userinput></screen>
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310 <para>Test the script by running it from the command line as the <systemitem class="username">root</systemitem> user.</para>
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311 <screen><userinput>/etc/init.d/evergreenstart restart</userinput></screen>
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312 <para>You will also need to restart apache as <systemitem class="username">root</systemitem>.</para>
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313 <screen><userinput>/etc/init.d/apache2 restart</userinput></screen>
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316 <para>Update runlevel defaults of the new evergreenstart service as the <systemitem class="username">root</systemitem> user:</para>
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317 <screen><userinput>update-rc.d evergreenstart defaults 80 20</userinput></screen>
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318 <note><para>For Evergreen to start properly during a reboot, you will want to ensure that the first number <option>80</option> is lower than the assigned starting priority for Apache so it starts before Apache. It should also a higher stopping priority <option>20</option> than Apache so it stops after Apache at shutdown.</para></note>
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321 <para>For more information on update-rc.d you should review the documentation on this topic for <link xl:href="http://www.debuntu.org/how-to-manage-services-with-update-rc.d">
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322 Debian</link> or <link xl:href="http://manpages.ubuntu.com/manpages/hardy/man8/update-rc.d.8.html">Ubuntu</link> depending on your distribution of Linux.</para>
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324 <section xml:id="backingup">
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325 <title>Backing Up</title>
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326 <indexterm><primary>databases</primary><secondary>backing up</secondary></indexterm>
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328 <para>Backing up your system files and data is a critical task for server and database administrators.
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329 Having a strategy for backing up and recovery could be the difference between a minor annoyance for users and
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330 a complete catastrophe.</para>
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332 <title>Backing up the <application>Evergreen</application> Database</title><indexterm><primary>databases</primary></indexterm>
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333 <para>Most of the critical data for an <application>Evergreen</application> system – patrons, bibliographic records, holdings,
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334 transactions, bills – is stored in the <application>PostgreSQL</application><indexterm><primary>databases</primary>
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335 <secondary>PostgreSQL</secondary></indexterm> database. You can therefore use normal
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336 <application>PostgreSQL</application> backup procedures to backup this data. For example, the simplest method of backing up the Evergreen
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337 database is to use the <command>pg_dump</command> command to create a live backup of the database without having to
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338 interrupt any Evergreen services. Here is an example pg_dump command which will dump a local Evergreen database into a the file <filename>evergreen_db.backup</filename>:</para>
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339 <screen><userinput>pg_dump -U evergreen -h localhost -f evergreen_db.backup evergreen</userinput></screen>
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340 <para>To restore the backed up database into a new database, create a new database using the
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341 template0 database template and the UTF8 encoding, and run the <command>psql</command> command, specifying the new
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342 database as your target:</para>
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343 <screen><userinput>createdb -T template0 -E UTF8 -U evergreen -h localhost new_evergreen</userinput></screen>
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344 <screen><userinput>psql -U evergreen -h localhost -f evergreen_db.backup new_evergreen</userinput></screen>
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346 <para>This method of backup is only suitable for small Evergreen instances. Larger sites
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347 should consider implementing continuous archiving (also known as <quote>log shipping</quote>) to provide
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348 more granular backups with lower system overhead. More information on backing up <application>PostgreSQL</application>
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349 databases can be found in the official <link xl:href="http://www.postgresql.org/docs/"><application>PostgreSQL</application> documentation</link>.</para>
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353 <title>Backing up Evergreen Files</title>
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354 <indexterm><primary>directories</primary><secondary>backing up</secondary></indexterm>
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355 <para>When you deploy Evergreen, you will probably customize many aspects of your system including
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356 the system configuration files, <application>Apache</application> configuration files, OPAC and Staff Client. In order to
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357 protect your investment of time, you should carefully consider the best approach to backing up
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359 <para>There are a number of ways of tackling this problem. You could create a script that regularly
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360 creates a time-stamped tarball of all of these files and copies it to a remote server - but that
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361 would build up over time to hundreds of files. You could use <link xl:href="http://www.samba.org/rsync/"><application>rsync</application></link>
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362 <indexterm><primary>rsync</primary></indexterm> to ensure that the files of
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363 interest are regularly updated on a remote server - but then you would lose track of the changes to
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364 the files, should you make a change that introduces a problem down the road.</para>
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365 <para>Perhaps one of the best options is to use a version control system like <link xl:href="http://bazaar.canonical.com">
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366 <application>Bazaar</application></link><indexterm><primary>Version Control System</primary><secondary>Subversion</secondary></indexterm>,
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367 <link xl:href="http://git-scm.com/"><application>git</application></link><indexterm><primary>Version Control System</primary><secondary>git</secondary></indexterm>
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368 or <link xl:href="http://subversion.apache.org/"><application>Subversion</application></link><indexterm><primary>Version Control System</primary>
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369 <secondary>Subversion</secondary></indexterm> to regularly push updates of the files you care about to a repository on a
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370 remote server. This gives you the advantage of quickly being able to run through the history of the
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371 changes you made, with a commenting system that reminds you why each change was made, combined with
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372 remote storage of the pertinent files in case of disaster on site. In addition, your team can create
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373 local copies of the repository and test their own changes in isolation from the production
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374 system. Using a version control system also helps to recover system customizations after an
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378 <title>Full System Backup</title>
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379 <para>A full system backup archives every file on the file system. Some basic methods require you
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380 to shut down most system processes; other methods can use mirrored RAID<indexterm><primary>RAID</primary></indexterm> setups or
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381 SAN<indexterm><primary>SAN</primary></indexterm> storage to
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382 take <quote>snapshot</quote> backups of your full system while the system continues to run. The subject of how
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383 to implement full system backups is beyond the scope of this documentation.</para>
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386 <section xml:id="security">
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387 <title>Security</title>
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388 <indexterm><primary>security</primary></indexterm>
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389 <para>As with an ILS and resource accessible from the world wide web careful consideration needs to be
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390 given to the security of your <application>Evergreen</application> servers and database. While it is impossible to cover all aspects
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391 of security, it is important to take several precautions when setting up production <application>Evergreen</application> site.</para>
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394 <para>Change the Evergreen <systemitem class="username">admin</systemitem> password and keep it secure. The
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395 default admin password is known by anyone who has installed <application>Evergreen</application>. It is not a secret
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396 and needs to be changed by the Administrator. It should also only be shared by those who
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397 need the highest level of access to your system.</para>
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400 <para>Create strong passwords using a combination of numerical and alphabetical characters
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401 for all of the Administrative passwords including the <systemitem class="username">postgres</systemitem> and
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402 <systemitem class="username">opensrf</systemitem> users</para>
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405 <para>Open ports in the firewall<indexterm><primary>firewall</primary></indexterm> with caution - It is only necessary to open ports
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406 <systemitem class="protocol">80</systemitem> and <systemitem class="protocol">443</systemitem>
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407 for <systemitem class="protocol">TCP</systemitem> connections to the Evergreen server from the OPAC and the staff client. It is critical for administrators to
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408 understand the concepts of network security and take precautions to minimize vulnerabilities.
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412 <para>Use permissions <indexterm><primary>permissions</primary></indexterm> and permission groups wisely - it is important to understand the
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413 purpose of the permissions and to only give users the level of access that they require.
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418 <section xml:id="logfiles">
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419 <title>Managing Log Files</title>
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420 <indexterm><primary>logs</primary><secondary>managing</secondary></indexterm>
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421 <para><application>Evergreen</application> comes with a sophisticated logging system, but it is important to manage the <application>OpenSRF</application>
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422 and <application>Evergreen</application> logs. This section will provide a couple of log management techniques and tools.</para>
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424 <title>Using the <systemitem class="service">logrotate</systemitem> Utility to Manage Log Size</title>
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425 <indexterm><primary>logs</primary><secondary>Log Rotate</secondary></indexterm>
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426 <para>Fortunately, this is not a new problem for <systemitem class="osname">Unix</systemitem> administrators, and there are a number of ways of keeping your logs under control.
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427 On <systemitem class="osname">Debian</systemitem> and <systemitem class="osname">Ubuntu</systemitem>, for example,
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428 the <systemitem class="service">logrotate</systemitem> utility controls when old log files are compressed and a new log file is started.
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429 <systemitem class="service">logrotate</systemitem> runs once a day and checks all log files that it knows about to see if a
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430 threshold of time or size has been reached and rotates the log files if a threshold condition has been met.</para>
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431 <para>To teach <systemitem class="service">logrotate</systemitem> to rotate Evergreen logs on a weekly basis, or if they are > 50MB in size,
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432 create a new file <filename>/etc/logrotate.d/evergreen</filename> with the following contents: </para>
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435 /openils/var/log/*.log {
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436 # keep the last 4 archived log files along with the current log file
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437 # log log.1.gz log.2.gz log.3.gz log.4.gz
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438 # and delete the oldest log file (what would have been log.5.gz)
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440 # if the log file is > 50MB in size, rotate it immediately
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442 # for those logs that don't grow fast, rotate them weekly anyway
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448 <title>Changing Logging Level for <application>Evergreen</application></title>
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449 <indexterm><primary>logs</primary><secondary>logging levels</secondary></indexterm>
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450 <para>Change the Log Levels in your config files. Changing the level of logging will help
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451 narrow down errors.</para>
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453 <para>A high logging level is not wise to do in a production environment since it
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454 will produce vastly larger log files and thus reduce server performance.</para>
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456 <para>Change logging levels by editing the configuration file
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457 <filename>/openils/conf/opensrf_core.xml</filename><indexterm><primary>configuration files</primary><secondary>opensrf_core.xml</secondary></indexterm></para>
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458 <para>you will want to search for lines containing <loglevel>.</para>
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459 <para> the default setting for loglevel is 3 which will log <emphasis>errors</emphasis>,
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460 <emphasis>warnings</emphasis> and <emphasis>information</emphasis>.</para>
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461 <para>The next level is 4 which is for debugging and provides additional information
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462 helpful for the debugging process.</para>
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463 <para>Thus, lines with:</para>
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464 <programlisting><loglevel>3</loglevel></programlisting>
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465 <para>Should be changed to:</para>
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466 <programlisting><loglevel>4</loglevel></programlisting>
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467 <para>to allow debugging level logging</para>
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468 <para>Other logging levels include <emphasis>0</emphasis> for no logging,
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469 <emphasis>1</emphasis> for logging errors and <emphasis>2</emphasis> for logging warnings
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473 <section xml:id="InstallingPostgreSQL">
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474 <title>Installing PostgreSQL from Source</title>
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475 <indexterm><primary>databases</primary><secondary>PostgreSQL</secondary></indexterm>
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476 <para>Some <systemitem class="osname">Linux</systemitem> distributions, such as <systemitem class="osname">Debian Etch (4.0)</systemitem>, do not offer PostgreSQL
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477 version 8.2 as an installable package. Before you continue, examine the software dependencies listed in <xref linkend="serversideinstall-software-dependencies"/>
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478 to ensure that your Linux distribution supports the required version of PostgreSQL.</para>
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481 <para>Some <systemitem class="osname">Linux</systemitem> distributions, such as <systemitem class="osname">Debian Etch (4.0)</systemitem>, do not offer PostgreSQL
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482 version 8.2 as an installable package. Before you continue, examine the software dependencies listed in <xref linkend="serversideinstall-software-dependencies"/>
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483 to ensure that your Linux distribution supports the required version of PostgreSQL.</para>
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488 <para>Install the application <application>stow</application> on your system if it is not already installed. Issue the following command as
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489 the <systemitem class="username">root</systemitem> user:</para>
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491 <userinput>apt-get install stow</userinput>
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495 <para>Download, compile, and install the latest release for PostgreSQL 8.2 (which was version <literal>8.2.12</literal> at the time of this writing).
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496 As the <systemitem class="username">root</systemitem> user, follow these steps:</para>
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500 wget http://wwwmaster.postgresql.org/redir/198/h/source/v8.2.17/postgresql-8.2.17.tar.bz2
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501 tar xzf postgresql-8.2.17.tar.gz
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502 cd postgresql-8.2.17
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503 ./configure --with-perl --enable-integer-datetimes --with-openssl --prefix=/usr/local/stow/pgsql
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519 <para>Create the new user <systemitem class="username">postgres</systemitem> to run the PostgreSQL processes.
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520 As the <systemitem class="username">root</systemitem> user, execute this command:</para>
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521 <screen><userinput>adduser postgres</userinput></screen>
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524 <para>Initialize the database directory and start up PostgreSQL. As the <systemitem class="username">root</systemitem> user, follow these steps:</para>
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528 mkdir -p /usr/local/pgsql/data
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529 chown postgres /usr/local/pgsql/data
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531 initdb -D /usr/local/pgsql/data -E UNICODE --locale=C
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532 pg_ctl -D /usr/local/pgsql/data -l /home/postgres/logfile start
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536 <para>If an error occurs during the final step above, review the path of the home directory for the
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537 <systemitem class="username">postgres</systemitem> user. It may be <literal>/var/lib/postresql</literal> instead of <literal>/home/postres</literal>.</para>
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542 <section xml:id="configuringPostgreSQL">
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543 <title>Configuring PostgreSQL</title>
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544 <indexterm><primary>databases</primary><secondary>PostgreSQL</secondary></indexterm>
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545 <para>The values of several PostreSQL configuration parameters may be changed for enhanced performance. The following table lists the default values
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546 and some suggested updates for several useful parameters:</para>
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548 <title>Suggested configuration values</title>
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549 <tgroup align="left" cols="3" colsep="1" rowsep="1">
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550 <colspec colnum="1" colwidth="1.0*"/>
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551 <colspec colnum="2" colwidth="1.0*"/>
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552 <colspec colnum="3" colwidth="1.0*"/>
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555 <entry>Parameter</entry>
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556 <entry>Default</entry>
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557 <entry>Suggested</entry>
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562 <entry>default_statistics_target</entry>
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567 <entry>work_mem</entry>
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569 <entry>128Mb</entry>
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572 <entry>shared_buffers</entry>
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574 <entry>512Mb</entry>
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577 <entry>effective_cache_size</entry>
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578 <entry>128Mb</entry>
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