# Master Slave configuration

**URL:** <https://forums.percona.com/t/master-slave-configuration/13167>\
**Category:** Percona XtraDB Cluster 5.x\
**Tags:** mysql, percona\
**Created:** [November 22, 2021, 7:34pm UTC](https://forums.percona.com/t/master-slave-configuration/13167 "2021-11-22T19:34:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Richmond\_Eric-okolai](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/richmond_eric-okolai/32/5148_2.png) [@Richmond\_Eric-okolai](https://forums.percona.com/u/Richmond_Eric-okolai)\
**Post date:** [November 22, 2021, 7:34pm UTC](https://forums.percona.com/t/master-slave-configuration/13167/1 "2021-11-22T19:34:55Z")

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I have a three node cluster already setup with percona xtradb cluster 5.7 which works fine, however, I would like like to create the 4th server and then setup master-slave replication with the third node as the master and 4th the slave. and would i require SSL certs?  
while following this [How to setup a slave for replication in 6 simple steps with Percona XtraBackup](https://www.percona.com/doc/percona-xtrabackup/2.1/howtos/setting_up_replication.html) as a guide, i run into issues trying to configure the master when i run the command in step one in the documentation which gives me the error highlighted in yellow in the image below.

 ![master config error](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/0/0a6c9f1ccfbfcde9b19fa191dbd191583a7883f5.png)

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**Author:** ![matthewb](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/matthewb/32/34_2.png) [@matthewb](https://forums.percona.com/u/matthewb)\
**Post date:** [November 23, 2021, 6:08pm UTC](https://forums.percona.com/t/master-slave-configuration/13167/2 "2021-11-23T18:08:50Z")

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First off, `innobackupex` is dead software. You should be using `xtrabackup` instead. Next, you’re reading a very out dated (EOL). You need to be reading the Xtrabackup 2.4 documentation. Lastly, innobackup/xtrabackup are _physical_ backup tools, which means they must be ran on a machine with mysql data already running to create the backup. You do not run this tool on the new replica. Look for the xtrabackup documentation on “streaming backup”