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0. Upgrade procedure from v2.3 to v2.4

!!! notice It is assumed that the upgrade happens from an up-to-date 2.3 instance
It is a good idea to back up your MISP installation and data before upgrading to a new release.

1. git pull the latest version of MISP from the repo

cd /var/www/MISP
git pull
git checkout tags/$(git describe --tags `git rev-list --tags --max-count=1`)
# if the last shortcut doesn't work, specify the latest version manually
# example: git checkout tags/v2.4.XY
# the message regarding a "detached HEAD state" is expected behaviour
# (you only have to create a new branch, if you want to change stuff and do a pull request for example)

2. Update CakePHP to the latest supported version

cd /var/www/MISP
rm -rf app/Lib/cakephp/
git submodule update --init --recursive

3. delete everything from MISP's cache directory to get rid of the cached models

find /var/www/MISP/app/tmp/cache/ -type f -not -name 'empty' -delete

4. clear the old submodule cached entry for CakeResque

cd /var/www/MISP
git rm --cached app/Plugin/CakeResque/

5. make sure that your database is backed up

mysqldump -u [misp_mysql_user] -p [misp_database] > /home/[my_user]/misp_db_pre_migration.sql

6. upgrade your database with the new tables / fields introduced in 2.4

cd /var/www/MISP/INSTALL
mysql -u [misp_mysql_user] -p [misp_database] < upgrade_2.4.sql

7. run the upgrade script from within the application

!!! notice simply navigate to Administration -> Administrative Tools -> "Upgrade to 2.4"
Once that has completed successfully run the 2.3->2.4 cleanup script
simply navigate to Administration -> Administrative Tools -> "2.3->2.4 cleanup script"

!!! notice If everything went fine, switch the system to live:
Administration -> Server Settings -> MISP Settings -> MISP.live -> True

!!! notice If nothing happens, please check the permissions of the config files in /var/www/MISP/app/Config/
and make sure the webserver has the write permissions on them: bash chown -R www-data:www-data /var/www/MISP/app/Config/

Let us know if you run into any issues during or after the upgrade

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