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date Wed Jul 16 21:55:03 2014 +0200 (2014-07-16)
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bsw@1045 1 <html>
bsw@1045 2 <head>
jbe@1046 3 <title>LiquidFeedback Installation Instructions</title>
bsw@1045 4 </head>
bsw@1045 5 <body>
jbe@1046 6 <h1>LiquidFeedback Installation Instructions</h1>
jbe@1046 7
jbe@1046 8 <p>This document gives a short outline about the necessary steps to setup a
jbe@1046 9 LiquidFeedback system.</p>
jbe@1046 10
jbe@1046 11 <h2>1. Install necessary dependencies</h2>
jbe@1046 12
jbe@1046 13 <p>If you're using a Debian system, make sure that the following packages are
jbe@1046 14 installed:</p>
jbe@1046 15
bsw@1045 16 <ul>
bsw@1045 17 <li>lua5.1</li>
bsw@1045 18 <li>postgresql</li>
bsw@1045 19 <li>build-essential</li>
bsw@1045 20 <li>libpq-dev</li>
bsw@1045 21 <li>liblua5.1-0-dev</li>
bsw@1045 22 <li>lighttpd</li>
bsw@1045 23 <li>ghc</li>
bsw@1045 24 <li>libghc6-parsec3-dev</li>
bsw@1045 25 <li>imagemagick</li>
bsw@1045 26 <li>exim4</li>
jbe@1046 27 <li>markdown2 (install with Python's pip)</li>
bsw@1045 28 </ul>
jbe@1046 29
jbe@1046 30 <p>If you're using any other Linux distribution or BSD system, install the
jbe@1046 31 necessary software components accordingly.</p>
jbe@1046 32
jbe@1046 33 <h2>2. Ensure that the user account of your webserver has access to the database</h2>
jbe@1046 34
jbe@1046 35 <p>Whichever useraccount is used by the webserver (usually <code>www-data</code>) needs to
jbe@1046 36 have access to your PostgreSQL installation. This is done by executing
jbe@1046 37 PostgreSQL's shell command <code>createuser</code> as database superuser (usually <code>pgsql</code>,
jbe@1046 38 or <code>postgres</code> for Debian installations):</p>
jbe@1046 39
bsw@1045 40 <pre><code>su - postgres
bsw@1045 41 createuser
bsw@1045 42
bsw@1045 43 Enter name of role to add: www-data
bsw@1045 44 Shall the new role be a superuser? (y/n) n
bsw@1045 45 Shall the new role be allowed to create databases? (y/n) y
bsw@1045 46 Shall the new role be allowed to create more new roles? (y/n) n
bsw@1045 47
jbe@1046 48 exit
jbe@1046 49 </code></pre>
jbe@1046 50
jbe@1046 51 <h2>3. Install and configure LiquidFeedback-Core</h2>
jbe@1046 52
jbe@1046 53 <p>We recommend to create the database with the same user as your webserver
jbe@1046 54 (usually <code>www-data</code>) to avoid having to setup database privileges.</p>
jbe@1046 55
jbe@1046 56 <p>The example below installs the database as <code>www-data</code> and stores the two
jbe@1046 57 executables <code>lf_update</code> and <code>lf_update_issue_order</code> in the directory
jbe@1046 58 <code>/opt/liquid_feedback_core/</code>:</p>
jbe@1046 59
bsw@1045 60 <pre><code># Download and unpack LiquidFeedback-Core
bsw@1045 61 # from http://www.public-software-group.org/pub/projects/liquid_feedback/backend/
bsw@1045 62 make
bsw@1045 63 mkdir /opt/liquid_feedback_core
bsw@1045 64 cp core.sql lf_update lf_update_issue_order /opt/liquid_feedback_core
bsw@1045 65 su - www-data
bsw@1045 66 cd /opt/liquid_feedback_core
bsw@1045 67 createdb liquid_feedback
bsw@1045 68 createlang plpgsql liquid_feedback # command may be omitted, depending on PostgreSQL version
jbe@1046 69 psql -v ON_ERROR_STOP=1 -f core.sql liquid_feedback
jbe@1046 70 </code></pre>
jbe@1046 71
bsw@1045 72 <p>A simple configuration may look as follows:</p>
jbe@1046 73
bsw@1045 74 <pre><code>psql liquid_feedback
bsw@1045 75
jbe@1046 76 INSERT INTO system_setting (member_ttl) VALUES ('1 year');
jbe@1046 77 INSERT INTO contingent (polling, time_frame, text_entry_limit, initiative_limit) VALUES (false, '1 hour', 20, 6);
jbe@1046 78 INSERT INTO contingent (polling, time_frame, text_entry_limit, initiative_limit) VALUES (false, '1 day', 80, 12);
jbe@1046 79 INSERT INTO contingent (polling, time_frame, text_entry_limit, initiative_limit) VALUES (true, '1 hour', 200, 60);
jbe@1046 80 INSERT INTO contingent (polling, time_frame, text_entry_limit, initiative_limit) VALUES (true, '1 day', 800, 120);
jbe@1046 81 INSERT INTO policy (index, name, admission_time, discussion_time, verification_time, voting_time, issue_quorum_num, issue_quorum_den, initiative_quorum_num, initiative_quorum_den) VALUES (1, 'Default policy', '8 days', '15 days', '8 days', '15 days', 10, 100, 10, 100);
jbe@1046 82 INSERT INTO unit (name) VALUES ('Our organization');
jbe@1046 83 INSERT INTO area (unit_id, name) VALUES (1, 'Default area');
jbe@1046 84 INSERT INTO allowed_policy (area_id, policy_id, default_policy) VALUES (1, 1, TRUE);
jbe@1046 85 </code></pre>
jbe@1046 86
bsw@1045 87 <p>If you want to create an admin user with an empty password (CAUTION!), then execute the following SQL statement:</p>
jbe@1046 88
jbe@1046 89 <pre><code>INSERT INTO member (login, name, admin, password) VALUES ('admin', 'Administrator', TRUE, '$1$/EMPTY/$NEWt7XJg2efKwPm4vectc1');
jbe@1046 90 </code></pre>
jbe@1046 91
bsw@1045 92 <p>Exit the <code>psql</code> interface by typing:</p>
jbe@1046 93
jbe@1046 94 <pre><code>\q
jbe@1046 95 </code></pre>
jbe@1046 96
bsw@1045 97 <p>And don't forget to quit the <code>www-data</code> shell:</p>
jbe@1046 98
jbe@1046 99 <pre><code>exit
jbe@1046 100 </code></pre>
jbe@1046 101
jbe@1046 102 <h2>4. Install WebMCP</h2>
jbe@1046 103
jbe@1046 104 <p>Note: Using Debian, it may be necessary to append <code>-I /usr/include/lua5.1</code> at
jbe@1046 105 the end of the CFLAGS line in <code>Makefile.options</code> of the WebMCP source
jbe@1046 106 distibution:</p>
jbe@1046 107
bsw@1045 108 <pre><code># Download and unpack WebMCP
bsw@1045 109 # from http://www.public-software-group.org/pub/projects/webmcp/
bsw@1045 110 vi Makefile.options # Debian requires -I /usr/include/lua5.1 at end of CFLAGS line
bsw@1045 111 make
bsw@1045 112 mkdir /opt/webmcp
jbe@1046 113 cp -RL framework/* /opt/webmcp/
jbe@1046 114 </code></pre>
bsw@1045 115
jbe@1046 116 <h2>5. Install the LiquidFeedback-Frontend</h2>
bsw@1045 117
bsw@1045 118 <p>Unpack source tree into appropriate directory, e.g. <code>/opt/liquid_feedback_frontend</code>:</p>
jbe@1046 119
bsw@1045 120 <pre><code># Download LiquidFeedback-Frontend
bsw@1045 121 # from http://www.public-software-group.org/pub/projects/liquid_feedback/frontend/
jbe@1046 122 mv liquid_feedback_frontend-vX.X.X /opt/liquid_feedback_frontend
jbe@1046 123 </code></pre>
jbe@1046 124
bsw@1045 125 <p>Create HTML code for help texts:</p>
jbe@1046 126
bsw@1045 127 <pre><code>cd /opt/liquid_feedback_frontend/locale
jbe@1046 128 PATH=/opt/rocketwiki-lqfb:$PATH make
jbe@1046 129 </code></pre>
jbe@1046 130
bsw@1045 131 <p>Make <code>tmp/</code> directory of LiquidFeedback-Frontend writable for webserver:</p>
jbe@1046 132
jbe@1046 133 <pre><code>chown www-data /opt/liquid_feedback_frontend/tmp
jbe@1046 134 </code></pre>
jbe@1046 135
bsw@1045 136 <p>Compile binary for fast delivery of member images:</p>
jbe@1046 137
bsw@1045 138 <pre><code>cd /opt/liquid_feedback_frontend/fastpath
bsw@1045 139 vi getpic.c # check and modify #define commands as necessary
jbe@1046 140 make
jbe@1046 141 </code></pre>
jbe@1046 142
jbe@1046 143 <h2>6. Configure mail system</h2>
jbe@1046 144
jbe@1046 145 <p>It may be necessary to configure your server's mail system, e.g. running
jbe@1046 146 <code>dpkg-reconfigure exim4-config</code> on a Debian system.</p>
jbe@1046 147
jbe@1046 148 <h2>7. Configure the Webserver for LiquidFeedback:</h2>
jbe@1046 149
jbe@1046 150 <p>A sample configuration for <code>lighttpd</code> is given below (assuming <code>mod_alias</code> has
jbe@1046 151 been included elsewhere):</p>
jbe@1046 152
jbe@1046 153 <pre><code>server.modules += ("mod_cgi", "mod_rewrite", "mod_redirect", "mod_setenv")
bsw@1045 154
bsw@1045 155 # Enable CGI-Execution of *.lua files through lua binary
jbe@1046 156 cgi.assign += ( ".lua" =&gt; "/usr/bin/lua5.1" )
bsw@1045 157
jbe@1046 158 alias.url += ( "/lf/fastpath/" =&gt; "/opt/liquid_feedback_frontend/fastpath/",
jbe@1046 159 "/lf/static" =&gt; "/opt/liquid_feedback_frontend/static",
jbe@1046 160 "/lf" =&gt; "/opt/webmcp/cgi-bin" )
bsw@1045 161
bsw@1045 162 # Configure environment for demo application
jbe@1046 163 $HTTP["url"] =~ "^/lf" {
bsw@1045 164 setenv.add-environment += (
jbe@1046 165 "LANG" =&gt; "en_US.UTF-8",
jbe@1046 166 "WEBMCP_APP_BASEPATH" =&gt; "/opt/liquid_feedback_frontend/",
jbe@1046 167 "WEBMCP_CONFIG_NAME" =&gt; "myconfig")
bsw@1045 168 }
bsw@1045 169
bsw@1045 170 # URL beautification
bsw@1045 171 url.rewrite-once += (
bsw@1045 172 # do not rewrite static URLs
jbe@1046 173 "^/lf/fastpath/(.*)$" =&gt; "/lf/fastpath/$1",
jbe@1046 174 "^/lf/static/(.*)$" =&gt; "/lf/static/$1",
bsw@1045 175
bsw@1045 176 # dynamic URLs
jbe@1046 177 "^/lf/([^\?]*)(\?(.*))?$" =&gt; "/lf/webmcp-wrapper.lua?_webmcp_path=$1&amp;$3",
bsw@1045 178
bsw@1045 179 )
bsw@1045 180
jbe@1046 181 $HTTP["url"] =~ "^/lf/fastpath/" {
jbe@1046 182 cgi.assign = ( "" =&gt; "" )
jbe@1046 183 setenv.add-response-header = ( "Cache-Control" =&gt; "private; max-age=86400" )
jbe@1046 184 }
jbe@1046 185 </code></pre>
jbe@1046 186
jbe@1046 187 <p>If you're using Debian, you may want to create a file with the name
jbe@1046 188 <code>/etc/lighttpd/conf-available/60-liquidfeedback.conf</code> and create a softlink in
jbe@1046 189 <code>/etc/lighttpd/conf-enabled/</code>.</p>
jbe@1046 190
jbe@1046 191 <h2>8. Configure the LiquidFeedback-Frontend:</h2>
jbe@1046 192
bsw@1045 193 <pre><code>cd /opt/liquid_feedback_frontend/config
bsw@1045 194 cp example.lua myconfig.lua
jbe@1046 195 # edit myconfig.lua according to your needs
jbe@1046 196 </code></pre>
jbe@1046 197
jbe@1046 198 <p>Use the following option in your configuration file to enable fast image
jbe@1046 199 loading:</p>
jbe@1046 200
bsw@1045 201 <pre><code>config.fastpath_url_func = function(member_id, image_type)
jbe@1046 202 return request.get_absolute_baseurl() .. "fastpath/getpic?" .. tostring(member_id) .. "+" .. tostring(image_type)
jbe@1046 203 end
jbe@1046 204 </code></pre>
jbe@1046 205
jbe@1051 206 <h2>9. Setup regular execution of <code>lf_update</code> and related commands </h2>
jbe@1046 207
jbe@1051 208 <p>The executables <code>lf_update</code>, <code>lf_update_issue_order</code>, and
jbe@1051 209 <code>lf_update_suggestion_order</code> must be executed regularly. This may be achieved
jbe@1051 210 by creating a file named <code>/opt/liquid_feedback_core/lf_updated</code> with the
jbe@1051 211 following contents:</p>
jbe@1046 212
bsw@1045 213 <pre><code>#!/bin/sh
bsw@1045 214
jbe@1046 215 PIDFILE="/var/run/lf_updated.pid"
bsw@1045 216 PID=$$
bsw@1045 217
jbe@1046 218 if [ -f "${PIDFILE}" ] &amp;&amp; kill -CONT $( cat "${PIDFILE}" ); then
jbe@1046 219 echo "lf_updated is already running."
bsw@1045 220 exit 1
bsw@1045 221 fi
bsw@1045 222
jbe@1046 223 echo "${PID}" &gt; "${PIDFILE}"
bsw@1045 224
bsw@1045 225 while true; do
jbe@1046 226 su - www-data -c 'nice /opt/liquid_feedback_core/lf_update dbname=liquid_feedback 2&gt;&amp;1 | logger -t "lf_updated"'
jbe@1051 227 su - www-data -c 'nice /opt/liquid_feedback_core/lf_update_issue_order dbname=liquid_feedback 2&gt;&amp;1 | logger -t "lf_updated"'
jbe@1046 228 su - www-data -c 'nice /opt/liquid_feedback_core/lf_update_suggestion_order dbname=liquid_feedback 2&gt;&amp;1 | logger -t "lf_updated"'
bsw@1045 229 sleep 5
jbe@1046 230 done
jbe@1046 231 </code></pre>
jbe@1046 232
bsw@1045 233 <p>This file must be marked as executable:</p>
jbe@1046 234
jbe@1046 235 <pre><code>chmod +x /opt/liquid_feedback_core/lf_updated
jbe@1046 236 </code></pre>
jbe@1046 237
bsw@1045 238 <p>And this file should be started automatically at system boot.</p>
jbe@1046 239
jbe@1046 240 <h2>10. Setup notification loop in background</h2>
jbe@1046 241
jbe@1046 242 <p>In addition to regular execution of <code>lf_update</code> and
jbe@1046 243 <code>lf_update_suggestion_order</code>, the following commands should be executed in
jbe@1046 244 background:</p>
jbe@1046 245
bsw@1045 246 <pre><code>su - www-data
bsw@1045 247 cd /opt/liquid_feedback_frontend/
jbe@1046 248 echo "Event:send_notifications_loop()" | ../webmcp/bin/webmcp_shell myconfig
jbe@1046 249 </code></pre>
jbe@1046 250
jbe@1046 251 <h2>11. Start the sytem</h2>
jbe@1046 252
jbe@1046 253 <p>After <code>lf_update</code> has been executed at least once, and the webserver has been
jbe@1046 254 restarted (using the configuration above), you should be able to access your
jbe@1046 255 LiquidFeedback system.</p>
bsw@1045 256 </body>
bsw@1045 257 </html>

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