# "Unknow variable wsrep\_cluster\_address" (actually wsrep\_\*) after upgrade 5.5 -\> 5.6 **URL:** \ **Category:** Percona XtraDB Cluster 5.x\ **Created:** [September 15, 2014, 6:02am UTC](https://forums.percona.com/t/unknow-variable-wsrep-cluster-address-actually-wsrep-after-upgrade-5-5-5-6/3738 "2014-09-15T06:02:57Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![joepmeloen12](https://avatars.discourse-cdn.com/v4/letter/j/bcef8e/32.png) [@joepmeloen12](https://forums.percona.com/u/joepmeloen12)\ **Post date:** [September 15, 2014, 6:02am UTC](https://forums.percona.com/t/unknow-variable-wsrep-cluster-address-actually-wsrep-after-upgrade-5-5-5-6/3738/1 "2014-09-15T06:02:57Z")
Following [url][Percona Server for MySQL 8.0 - Documentation — Percona Server 8.0 Documentation](http://www.percona.com/doc/percona-server/5.6/upgrading_guide_55_56.html%5B/url%5D) I just upgrade a 3-node PXC (test) cluster tot 5.6 All fine, though after upgrading the 1st node (rest of cluster is down) and starting it, I get the following (started with --wsrep\_cluster\_address=gcomm://) 014-09-15 13:22:30 1413 [Warning] Using unique option prefix myisam\_recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead. 2014-09-15 13:22:30 1413 [Note] Plugin ‘FEDERATED’ is disabled. 2014-09-15 13:22:30 1413 [Note] InnoDB: Using atomics to ref count buffer pool pages 2014-09-15 13:22:30 1413 [Note] InnoDB: The InnoDB memory heap is disabled 2014-09-15 13:22:30 1413 [Note] InnoDB: Mutexes and rw\_locks use GCC atomic builtins 2014-09-15 13:22:30 1413 [Note] InnoDB: Memory barrier is not used 2014-09-15 13:22:30 1413 [Note] InnoDB: Compressed tables use zlib 1.2.8 2014-09-15 13:22:30 1413 [Note] InnoDB: Using Linux native AIO 2014-09-15 13:22:30 1413 [Note] InnoDB: Using CPU crc32 instructions 2014-09-15 13:22:30 1413 [Note] InnoDB: Initializing buffer pool, size = 500.0M 2014-09-15 13:22:30 1413 [Note] InnoDB: Completed initialization of buffer pool 2014-09-15 13:22:30 1413 [Note] InnoDB: Highest supported file format is Barracuda. 2014-09-15 13:22:30 1413 [Note] InnoDB: 128 rollback segment(s) are active. 2014-09-15 13:22:30 1413 [Note] InnoDB: Waiting for purge to start 2014-09-15 13:22:30 1413 [Note] InnoDB: Percona XtraDB ([http://www.percona.com](http://www.percona.com)) 5.6.20-68.0 started; log sequence number 15578194093 2014-09-15 13:22:30 1413 [ERROR] mysqld: unknown variable ‘wsrep\_cluster\_address=gcomm://node2,node3’ 2014-09-15 13:22:30 1413 [ERROR] Aborting When I remove wsrep\_cluster\_address, the next wsrep\_\* will appear as being unknown. They all fail. AFAICS all packages were installed correctly : root@vtestnode1:~# dpkg --get-selections | grep -v deinstall| grep -i percona libperconaserverclient18.1 install percona-server-client-5.6 install percona-server-common-5.6 install percona-server-server-5.6 install Ubuntu information: root@vtestnode1:~# lsb\_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.1 LTS Release: 14.04 Codename: trusty Anyone have a clue what I’m doing wrong here? ---
**Author:** ![joepmeloen12](https://avatars.discourse-cdn.com/v4/letter/j/bcef8e/32.png) [@joepmeloen12](https://forums.percona.com/u/joepmeloen12)\ **Post date:** [September 16, 2014, 4:35am UTC](https://forums.percona.com/t/unknow-variable-wsrep-cluster-address-actually-wsrep-after-upgrade-5-5-5-6/3738/2 "2014-09-16T04:35:41Z")
Well, in case somebody has the same: turns out that de-installing _all_ percona related software and re-installing 5.6 fixed this. Probably it’s wise to deinstall 5.5 before installing 5.6. ---
**Author:** ![joepmeloen12](https://avatars.discourse-cdn.com/v4/letter/j/bcef8e/32.png) [@joepmeloen12](https://forums.percona.com/u/joepmeloen12)\ **Post date:** [September 16, 2014, 9:28am UTC](https://forums.percona.com/t/unknow-variable-wsrep-cluster-address-actually-wsrep-after-upgrade-5-5-5-6/3738/3 "2014-09-16T09:28:15Z")
Another update: per the manual I used sudo apt-get install percona-server-server-5.6 … to install the new version. That part didn’t work (for me, at last). I did succeed by using sudo apt-get install percona-xtradb-cluster-56 A clear case of RTRFM… read the RIGHT fine manual. Leaving this post here anyway in case somebody reads the wrong manual like I did.