# XtraDB Cluster installed where?
**URL:** https://forums.percona.com/t/xtradb-cluster-installed-where/12223
**Category:** Percona XtraDB Cluster 5.x
**Tags:** mysql, percona
**Created:** [September 20, 2021, 11:03am UTC](https://forums.percona.com/t/xtradb-cluster-installed-where/12223 "2021-09-20T11:03:13Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@zyxep](https://forums.percona.com/u/zyxep)
#### Post date: [September 20, 2021, 11:03am UTC](https://forums.percona.com/t/xtradb-cluster-installed-where/12223/1 "2021-09-20T11:03:13Z")
Hi,
I currently have a singleton server running Mysql 5.5.
I have been running some test upgrading it to a Percona 5.6, which isn’t myproblem.
My question is:
Do I install XtraDB Cluster on the same nodes as the database servers?
My end goal is to get that singleton server upgraded to 5.6 at least and then cluster it, so I can easily upgrade it.
I am aware of ProxySQL with HAproxy needs to be installed on 2 VM’s with 1 VIP addr.
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### Author:  [@matthewb](https://forums.percona.com/u/matthewb)
#### Post date: [September 20, 2021, 3:04pm UTC](https://forums.percona.com/t/xtradb-cluster-installed-where/12223/2 "2021-09-20T15:04:06Z")
I’m confused. You say “singleton” but then talk about PXC, which is a clustering solution requiring 3 servers.
You can upgrade your “singleton” to a single node PXC 5.7 (please skip 5.6, it is dead software. Actually, skip 5.7 as 8.0 is current GA for almost 3 years). Then you can bring additional PXC nodes up and they will sync with your existing server and form a 3 node cluster.
You only need ProxySQL on 2 machines with a VIP. You don’t need HAProxy.
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### Author:  [@zyxep](https://forums.percona.com/u/zyxep)
#### Post date: [September 20, 2021, 3:38pm UTC](https://forums.percona.com/t/xtradb-cluster-installed-where/12223/3 "2021-09-20T15:38:31Z")
Let me try to rephrase it 🙂
Currently I have a singleton server, which I need to get setup as a cluster.
I am aware of the different versions and my goal is to get it up to 8.0 🙂 but considering the size of it I can’t just upgrade it 1 version at the time.
Especially not when it’s business critical… It’s lacking some legacy maintenance ☹
So what I need to know is basically just where I need to install XtraDB Cluster.
Do I just need:
2 x machines with ProxySQL.
3x Percona Server for MySQL with XtraDB Cluster.
Or should it be:
2 x machines with ProxySQL.
3x Percona Server for MySQL with
(amount)x XtraDB Cluster servers.
Why would I not need HAProxy as the LB?
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### Author:  [@matthewb](https://forums.percona.com/u/matthewb)
#### Post date: [September 20, 2021, 5:32pm UTC](https://forums.percona.com/t/xtradb-cluster-installed-where/12223/4 "2021-09-20T17:32:32Z")
> can’t just upgrade it 1 version at the time.
Yes, you can. Shut down 5.5, install 5.6, start up Mysql, run mysql\_upgrade. Shut down 5.6, install 5.7, start mysql, run mysql\_upgrade. shutdown 5.7, install mysql 8 (no need for mysql\_upgrade anymore). Done. Probably take you 30 min depending on how fast you can type.
> Do I just need:
You have 1 existing MySQL server. Stop mysql 5.5 on this server. Install PXC 5.6. Start this server, properly configured as a PXC node. You will bootstrap this node as it is the first member of the cluster.
Then, get 2 more servers, install PXC 5.7 (or 8), configure, and start them one at a time. They will sync with the existing server. After #3 is done, you have a 3-node cluster.
> Why would I not need HAProxy as the LB?
ProxySQL is your LB. You don’t need a load balancer in front of a load balancer.
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### Author:  [@zyxep](https://forums.percona.com/u/zyxep)
#### Post date: [September 20, 2021, 7:18pm UTC](https://forums.percona.com/t/xtradb-cluster-installed-where/12223/5 "2021-09-20T19:18:09Z")
I will do it a tiny bit differently but overall same steps.
Just to be dead clear, PXC Node == XtraDB Cluster, which is being installed next to percona-server-5.x ? correct?
I am new to the percona world, last time i used it was way way back, like 10 years.
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### Author:  [@matthewb](https://forums.percona.com/u/matthewb)
#### Post date: [September 20, 2021, 9:21pm UTC](https://forums.percona.com/t/xtradb-cluster-installed-where/12223/6 "2021-09-20T21:21:57Z")
PXC Node == XtraDB Cluster Node. PXC == Percona XtraDB Cluster; same thing.
“next to”? I don’t understand. You are “upgrading” MySQL 5.6 to “Percona XtraDB Cluster 5.6”. Removing MySQL 5.6 packages and replacing them with PXC 5.6.