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UNIX - FreeBSD/Linux. Apache, Nginx. ISPmanager, cPanel (WHM), DirectAdmin. Hadoop ecosystem (HDFS, Hive, Impala, Spark, Hbase, etc.) High load / High availability environments: replication,sharded databases,DRBD,HAProxy,CARP. Virtualization. Support, consulting, training, management, hardware and software installation and problem-solving.