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Depending on availability and load balancing requirements, the system can be installed as a single server or in a cluster.
When installed as a "Single server", all application containers including the database are running on one server.
- Less hardware resources required
- Less technical complexity
- Downtime of the system in case of necessary maintenance
- No redundancy in case of a server failure
- No load balancing when accessed by too many users
Installation as a cluster is recommended for use by approximately 100 users or more due to load balancing and/or when high availability of the system is required. Usually we install a cluster based on three servers.
Each server can be addressed directly as HTTP(s) endpoint or the distribution of requests is done by a load balancer placed in front of it (provided by the customer).
All application containers run in parallel on all servers. The database is set up as realtime replication in this setup. Each server has a 1:1 copy of the data. The individual application containers can access all three database instances - the distribution of requests is done automatically.
- High reliability
- Good load distribution
- No downtime during maintenance work on the operating system of the servers
- More hardware resources
- Higher technical complexity