It is a well-known fact that clustering Magento environments is technically complex. Adding Full Page Caching to a Magento cluster is even more difficult. Many people try to use PHP Full Page Caches with redis backends. This is not difficult, however the performance increase is not very good. Alternatively, introducing Varnish as the cache layer offers better performance. However, this creates a single point of failure, SSL termination issues, cache synchronization issues, and load balancing issues.
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