Message Queue

• In many cases we want messaging across systems to be reliable (delivery guranteed), but the major communication protocols like http/tcp are unreliable
• To support reliable messaging and guaranteed delivery, middleware called as Message Queue is used
• Refer Here for wiki definitions of Message Queues
• Popular Message Queues Refer Here
  • Active MQ
  • Rabbit MQ
  • Apache Kafka

Cache Server

• All the data about the systems are stored in Databases.
• Generally databases store the information on Disk in their own formats.
• Whenever application sends request to pull the information, Disk I/O has to happen and disks are generally slow in nature.
• RAM is faster than Disk, so if we can store the data which is changed infrequently on RAM then queries must be faster.
• So we introduce a Server which loads all the infrequently changed/static data into the RAM and when any application queries this data it can give quick response and thats the whole idea of Cache Servers
• Poplular Cache Servers Refer Here
  • Redis
  • Elastic Cache

Linux Essentials

• Refer Here
• AWS Free Tier Account Creation: Watch Here
• AWS EC2 Instance Creation: Watch Here