Nodes Failing to join cluster Percona xtradb on centos

I have installed percona extradb cluster 56 on centos, but when I bootstrap the first node and start MySQL in the other two nodes, they do not join the cluster.
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I have set SELinux to permissive mode and followed the percona xtradb cluster documentation but still, the nodes fail to join the cluster. Please help.

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PXC 5.6 is at least 6+ years old. Why did you install such old software? PXC 8.0 is the current stable release. You should be installing 8.0. 5.6 is not supported anymore, anywhere. If 5.6 is not working, I’m sorry, but you must upgrade first.

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