charsyam / the_red_en

the_red

• Run install_program.sh before running, and install zookeeper and redis.
• Docker must be executable.

Chapter 1

• It shows an example of a stateless service. Stateless servers can be easily expanded by adding them to Load Balancer.

geoip

• This is an example of a country that tells you when you type ip. Use the published maxmind library.
• An example of a stateless service that operates independently.

scrap

• This is an example of parsing and showing the entered url's Opengraph.
• An example of a stateless service that operates independently.

Chapter 2

loadbalancer

• The example of loadbalancer shows that loadbalancer works simply using nginx.
• nginx installation is required.

   sudo apt install -y nginx

• The nginx setting is: 127.0.0.1:7001 and 127.0.0.1:7002. You can run two scrap servers to use ports 7001 and 7002.
• You can use Docker.
• Docker build

   docker build . -t ch1/scrap

• Docker Run

   docker run -e ENDPOINTS=0.0.0.0:7001 --network host ch1/scrap
   docker run -e ENDPOINTS=0.0.0.0:7002 --network host ch1/scrap

• You can try running it with the following command:

service discovery

• Zookeeper must be run.
• When callers are added/removed, callers will be notified of the change in callers through Zookeeper.
• callee
• The service that performs the actual Scrap.
• caller
• Service to request Scrap to callee.
• The caller takes a list of calls and makes a request in a Round Robin way.