Differences

This shows you the differences between two versions of the page.

--- doc:appunti:linux:sa:liquidfeedback [2012/11/11 13:15] – [Core tools, WebMCP, RocketWiki and Frontend] niccolo
+++ doc:appunti:linux:sa:liquidfeedback [2012/11/11 13:27] – [Install a second instance of LiquidFeedback on the same host] niccolo
@@ Line 174: / Line 174: @@
 INSERT INTO member (login, name, admin, invite_code) VALUES ('admin', 'Administrator', TRUE, 'vieniqua');
 </code>
-===== Cronjob =====
+===== lf_update daemon =====
+The **''lf_update''** core program must be run regulary:
 <code>
@@ Line 181: / Line 183: @@
 </code>
+We must prepare a script that runs in an endless loop, **''/usr/local/sbin/lf_updated''**:
+<code bash>
+#!/bin/sh
+PIDFILE="/var/run/lf_updated.pid"
+PID=$$
+if [ -f "${PIDFILE}" ] && kill -CONT $( cat "${PIDFILE}" ); then
+  echo "lf_updated is already running."
+  exit 1
+fi
+echo "${PID}" > "${PIDFILE}"
+while true; do
+  nice /usr/local/lib/liquid_feedback_core/lf_update \
+      "host=localhost dbname=liquid_feedback user=liquid_feedback password=MySecret" 2>&1 \
+      | logger -t "lf_updated"
+  sleep 5
+done
+</code>
+The script contains database credentials, so protect it:
+<code>
+chown root:root /usr/local/sbin/lf_updated
+chmod 750 /usr/local/sbin/lf_updated
+</code>
+Then preare a script that start/stop the daemon, **''/etc/init.d/lf_updated''**:
+<code bash>
+#! /bin/sh
+### BEGIN INIT INFO
+# Provides:          lf_updated
+# Required-Start:    $syslog
+# Required-Stop:     $syslog
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: lf_updated
+# Description:       Calls LiquidFeedback lf_update regulary
+### END INIT INFO
+# PATH should only include /usr/* if it runs after the mountnfs.sh script
+PATH=/sbin:/usr/sbin:/bin:/usr/bin
+DESC="lf_updated"
+NAME=lf_updated
+DAEMON=/usr/local/sbin/lf_updated
+DAEMON_ARGS=""
+PIDFILE=/var/run/$NAME.pid
+SCRIPTNAME=/etc/init.d/$NAME
+. /lib/lsb/init-functions
+do_start()
+{
+        start-stop-daemon -b --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null || return 1
+        start-stop-daemon -b --start --quiet --pidfile $PIDFILE --exec $DAEMON -- $DAEMON_ARGS || return 2
+}
+do_stop()
+{
+        start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
+        RETVAL="$?"
+        [ "$RETVAL" = 2 ] && return 2
+        start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
+        [ "$?" = 2 ] && return 2
+        rm -f $PIDFILE
+        return "$RETVAL"
+}
+case "$1" in
+  start)
+        [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
+        do_start
+        case "$?" in
+|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
+) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
+        esac
+        ;;
+  stop)
+        [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
+        do_stop
+        case "$?" in
+|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
+) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
+        esac
+        ;;
+  status)
+       status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
+       ;;
+  restart|force-reload)
+        log_daemon_msg "Restarting $DESC" "$NAME"
+        do_stop
+        case "$?" in
+|1)
+                do_start
+                case "$?" in
+) log_end_msg 0 ;;
+) log_end_msg 1 ;; # Old process is still running
+                        *) log_end_msg 1 ;; # Failed to start
+                esac
+                ;;
+          *)
+                # Failed to stop
+                log_end_msg 1
+                ;;
+        esac
+        ;;
+  *)
+        echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
+        exit 3
+        ;;
+esac
+:
+</code>
+Activate the start/stop script at bootstrap:
+<code>
+chmod 755 /etc/init.d/lf_updated
+insserv lf_updated
+</code>
+The daemon logs to syslog with the **''lf_updated''** tag.
 ===== Configuring Apache =====
@@ Line 284: / Line 413: @@
 FIXME Verify if this checklist is complete.
-  - Create another database.
+  - Create another **database**.
-  - Create another Apache VirtualHost and declare the configuration filename in **''WEBMCP_CONFIG_NAME''**.
+  - Create another **Apache VirtualHost** and declare the configuration filename in **''WEBMCP_CONFIG_NAME''**.
   - Create another config file in ''/usr/local/share/liquid_feedback_frontend/config/'' configuring at least **''absolute_base_url''** and **''database''** credentials.
+  - Add or update the **''lf_updated''** daemon to run on each database instance.
 ===== LiquidFeedback administration =====