This small script blocks a shell script / docker compose command script till a dependent server boots up.
#!/usr/bin/env bash
while :
do
response=$(curl --write-out %{http_code} --silent --output /dev/null -X GET "$1")
if [[ "$response" -ne 200 ]] ; then
echo "Server is not yet up >> $1 >> $response"
sleep 1
else
echo "Server is up >> $1 >> $response"
exit 1
fi
done
Over the years I have learnt to make smaller size docker images which have usually worked well for me and I have been able to reduce my image files from GBs in size to few hundred MBs. I recently found an article which summarizes these best practices in an easy to use approach.
For a new project I was trying to setup a config server to connect my services together. Although the spring-cloud-config server works fine, I am not able to make my service talk to the config-server which is really strange as I am fairly well versed with Spring Cloud and usually setting up a dev environment is a no-brainer.
I have described my issue in stackoverflow to get help and I am debugging in parallel as well.
Hystrix used to be my tool of choice for implementing circuit breakers in my Spring Boot application. However there has been literally no commits in Hystrix github repo for past 1 year. It seems Netflix has moved on to resilience4j which will be actively maintained.
Resilience4j commit log is quite active and a lot of active work is going on in it.
However it should be noted that there is another mature library named Sentinel which seems to be quite feature rich and very well supported. It has been battle tested by Alibaba which is huge. In my next project I would be considering both Sentinel and Resilience4J in my choice for a reliable circuit breaker for my application.