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1 {{box cssClass="floatinginfobox" title="**Contents**"}}
2 {{toc/}}
3 {{/box}}
4
5 It's crucial that you define a backup strategy for your wiki so that you don't lose any data in case of a problem with your wiki installation or in case you have issues upgrading your XWiki instance to a newer version.
6
7 There are several parts that need to be backed up:
8
9 * The database
10 * The XWiki WAR file
11 * The Permanent data (located in the [[XWiki permanent directory>>platform:AdminGuide.Configuration||anchor="HConfiguringDirectories"]])
12 * Log files (optional)
13
14 = Backup your database =
15
16 If you've installed XWiki using your own database then you'll need a backup tool for that database to back it up and to restore it. Moreover, if you're backing up a huge amount of data, we advise that you compress the dump files to save disk space (for example with [[7-zip>>http://www.7-zip.org/]]).
17
18 * **MySQL**:(((
19 Backup: {{code}}mysqldump --add-drop-database --databases xwiki > xwiki.sql{{/code}} backs up the xwiki schema (use the option ##~-~-all-databases## instead of ##~-~-databases xwiki## if you want to backup the whole XWiki istance with all its subwikis).
20
21 {{warning}}
22 It's important that the backup is done with ##~-~-add-drop-database## since when you restore it it's important that tables that might have been created are removed. For example database migrations can create extra tables. If you want to cancel the migration and go back to your clean dump you'll need to have those tables removed as otherwise when you run the migration again later on you might have errors.
23 {{/warning}}
24 )))
25 * **PostgreSQL**: You can use {{code}}pg_dump xwiki > xwiki.sql{{/code}} to backup the PostgreSQL database. In case of backing up the whole instance, use the binary ##pg_dumpall## instead.
26 * **Oracle**: Use ##exp## to export data.
27 * **HSQLDB**: Simply backup the HSQLDB directory. For the XWiki standalone packaging it's the ##data/## directory.
28
29 = Backup the XWiki WAR =
30
31 To be on the safe side you can and should backup the whole XWiki WAR file (that's the file that was expanded and deployed in your Servlet Container when XWiki was installed).
32
33 More specifically the WAR contains mostly static files that are not changed. However it also contains some configuration files for XWiki and you really want to backup those, as explained below.
34
35 == Configuration files ==
36
37 There are several configuration files you'll need to backup:
38
39 * ##WEB-INF/hibernate.cfg.xml## (Hibernate configuration)
40 * ##WEB-INF/xwiki.cfg## (old XWiki configuration file but still used)
41 * ##WEB-INF/xwiki.properties## (new XWiki Configuration file)
42 * ##WEB-INF/classes/logback.xml## (Logging configuration)
43 * ##WEB-INF/observation/*## (Cluster configuration)
44
45 To restore them simply copy them at the same location where you backed them up from.
46
47 In addition you may want to also backup any extra files you'll have installed in your XWiki installation such as JDBC drivers, extra plugins, etc.
48
49 == Custom filesystem Skins ==
50
51 If you have a custom skin that is stored on the filesystem, make sure you backup the corresponding folder located in the ##webapps/xwiki/skins/## directory.
52
53 = Backup Permanent Data =
54
55 XWiki generates & saves data in the [[permanent directory>>platform:AdminGuide.Configuration||anchor="HConfiguringDirectories"]] of XWiki and it's important that you back it up.
56
57 Notes:
58 * The ##cache## directory can be removed and does not necessarily need to be backed up. However if you don't back it up, XWiki will need to regenerate its content (e.g. the Solr seach indexes) and that can take a lot of time. It's thus recommended to back it up too.
59
60 = Backup Log files =
61
62 XWiki generates logs in the console by default and these will go where your Servlet container has been defined to save them. For Tomcat for example this usually goes in the ##TOMCAT_HOME/logs/catalina.out## file.
63
64 However this is fully [[configurable>>platform:AdminGuide.Logging]] and you may have configured XWiki to output log files elsewhere. If you want to keep those logs, don't forget to save them. Those logs are not needed by XWiki but you may want to save them to review them later on to diagnose issues that happened for example.
65
66 = Using the XWiki Export feature =
67
68 Since most XWiki data is saved in wiki pages one solution to backup a XWiki instance is to export all its pages using XWiki's [[Import/Export feature>>platform:AdminGuide.ImportExport]]. However note that this is quite a resource hungry operation and depending on the size of your wiki you may need a lot of memory. As a consequence the recommended backup strategy is to backup the databases. It's much better to use a specialized backup tool that'll backup the database, perform incremental backups, verify backup integrity, etc.
69
70 In addition you should know that currently the following information is not located in wiki pages and is thus not saved in a wiki export:
71
72 * Activity stream data
73 * Statistics data
74 * Feed plugin data (if you use it)
75 * Deleted documents/attachments data
76 * XWiki Instance Id
77 * Mail Statuses
78
79 Moreover this won't save configuration data or other Permanent Data mentioned above such as installed Extensions, Lucene/SOLR index files and Logs.
80
81 In practice the Import/Export feature should be reserved for the following use cases:
82
83 * move data across XWiki instances, including sharing of applications between separate instances
84 * move data to another wiki
85 * convert from one database to another
86
87 = Restore your data =
88
89 * **MySQL**: Assuming you have your ##xwiki.sql## file handy (obtained running ##mysqldump## as explained above), run the following from the command line (or a script). Examples below are for the Linux shell.(((
90 * Disable constraints check first: {{code}}mysql -e "SET FOREIGN_KEY_CHECKS=0;"{{/code}} (restoring may fail with some cryptic error code, leaving the database in an inconsistent state, if you omit this step)
91 * Delete the existing ##xwiki## database if any: {{code}}mysql -e "DROP DATABASE xwiki;"{{/code}} (better to start fresh)
92 * Recreate the ##xwiki## database: {{code}}mysql -e "CREATE DATABASE IF NOT EXISTS xwiki DEFAULT CHARACTER SET utf8;"{{/code}}.
93 * Restore data from the dump file: {{code}}mysql xwiki --user=root -p < xwiki.sql{{/code}}. Alternatively, you can omit the ##-p## by adding a section [mysqldump] in your ##.my.cnf## file (with a user and password line, same as for [mysql]).
94 * Re-enable constraints checks: {{code}}mysql -e "SET FOREIGN_KEY_CHECKS=1;"{{/code}}
95
96 That is not all, now you need to restore the xwiki user rights (assuming the ##xwiki## user exists in MySQL).
97
98 * Update the xwiki user password from the (previously restored) hibernate configuration file(((
99 {{code language="none"}}
100 pass=$(cat /etc/xwiki/hibernate.cfg.xml | grep passw| head -1 | sed -e 's/^.*<prop.*password">//' | sed -e 's|</property>.*||')
101 mysql -e "SET PASSWORD FOR 'xwiki'@'localhost' = PASSWORD('$pass');"
102 {{/code}}
103 )))
104
105 Finally, restart you container, for example in Linux: {{code}}service tomcat7 restart{{/code}}
106 )))
107 * **PostgreSQL**: {{code}}psql -d xwiki -f xwiki.sql{{/code}} to restore your previously saved data. In full instance backup mode, use {{code}}psql -d postgres -f xwiki.sql{{/code}} instead.
108 * **Oracle**: Use ##imp##.
109
110 = Tips in case you are using nginx =
111
112 Assuming you have a nginx configuration with a {{code}}server_name{{/code}} entry that needs updating, the following script might be useful.
113
114 {{code}}
115 #!/bin/bash
116 configfile="/etc/nginx/sites-available/xwiki-as-root.conf"
117 # The following line works for Amazon EC2 instances. Change accordingly to find this host's IP dynamically.
118 thisip=$(curl -s http://instance-data/latest/meta-data/public-ipv4)
119 if [ ! -f $configfile ]; then
120 echo "Missing file: $configfile"
121 exit 1
122 fi
123 echo backing-up $configfile
124 cp $configfile $configfile-old
125
126 echo Setting nginx server_name to $thisip
127 old=$(cat $configfile | grep '^\ *server_name' | awk '{print $2}' | sed -e 's/;//' | grep "$thipip" | head -1)
128 if [ $? -eq 0 ] ; then
129 echo Fixing server_name
130 cat $configfile | sed -e "s/$old/$thisip/" > $configfile-new
131 mv $configfile-new $configfile
132 fi
133
134 echo Done. New config file:
135 cat $configfile
136
137 echo restarting nginx
138 service nginx restart
139 {{/code}}
140
141 = Sample Backup Script =
142
143 {{code}}
144 #!/bin/bash
145
146 #Space Separated List of Databases to Dump
147 #DATABASE="xwiki d1 d3"
148 DATABASE="xwiki"
149 DBUSER=root
150 DBPASS=*****
151
152 #XWIKI data folder
153 DATAFOLDER=/srv/tomcat6/data/
154 #Where is the webapps folder for your tomcat installation
155 # SLES 11 is located /srv/tomcat6/webapps
156 WEBAPPDIR=/srv/tomcat6/webapps
157 #What context (dir) does your application deploy to
158 DEPLOYCONTEXT=ROOT
159
160
161 ###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
162 DEPLOYDIR=${WEBAPPDIR}/${DEPLOYCONTEXT}
163 DATE=$(date '+%Y-%m-%d')
164 mkdir ./${DATE}
165
166 #backup mysql
167 echo "Backing up Mysql"
168 mysqldump -h 127.0.0.1 -u ${DBUSER} --password=${DBPASS} --max_allowed_packet=512m --add-drop-database --databases ${DATABASE} | /bin/gzip > ./${DATE}/${DATABASE}.sql.gz
169
170 echo "Backing up Data"
171 #Backup Exteral Data Storage
172 /bin/tar -C ${DATAFOLDER}/../ -zcf ./${DATE}/data.tar.gz data
173
174 #Backing Java Keystore
175 /bin/cp /srv/tomcat6/.keystore ./${DATE}/.keystore
176
177 echo "Backing up xwiki configuration"
178 /bin/cp ${DEPLOYDIR}/WEB-INF/hibernate.cfg.xml ./${DATE}/hibernate.cfg.xml
179 /bin/cp ${DEPLOYDIR}/WEB-INF/xwiki.cfg ./${DATE}/xwiki.cfg
180 /bin/cp ${DEPLOYDIR}/WEB-INF/xwiki.properties ./${DATE}/xwiki.properties
181
182 #Backup Deploy Context
183 echo "Backing UP deploy Context"
184 /bin/tar -C ${DEPLOYDIR}/../ -zcf ./${DATE}/ROOT.tar.gz ROOT
185
186 echo "DONE"
187 {{/code}}

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