Gokul Deepak

GoCool and Debug

DevOps

Important Docker Commands to remember

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You need not memorize these important docker commands. Repeated usage will make it easy for you to remember.

Important Docker Commands

  1. docker ps
  2. docker pull
  3. docker run
  4. docker stop
  5. docker restart
  6. docker exec
  7. docker search
  8. docker rename
  9. docker pause
  10. docker unpause
  11. docker kill
  12. docker login
  13. docker commit
  14. docker rmi
  15. docker cp
  16. docker logs
  17. docker info
  18. docker logout
  19. docker inspect
  20. docker history
  21. docker push

CORS error in Apache Tomcat – Solved

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Error: Access to XMLHttpRequest at ‘http://10.12.13.39:8080/content/fetchAllcontent/1/Books/Philosophy’ from origin ‘http://localhost’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

Solution: Add the below code in /opt/tomcat/conf/web.xml you can replace * in cors.allowed.origins with the domain you want eg: gokuldeepak.com

<filter>
    <filter-name>CorsFilter</filter-name>
    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
    <init-param>
        <param-name>cors.allowed.origins</param-name>
        <param-value>*</param-value>
    </init-param>
    <init-param>
        <param-name>cors.allowed.methods</param-name>
        <param-value>GET,POST,PUT,DELETE,HEAD,OPTIONS</param-value>
    </init-param>
    <init-param>
        <param-name>cors.allowed.headers</param-name>
        <param-value>Content-Type,X-Requested-With,Accept,Authorization,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value>
    </init-param>
    <init-param>
        <param-name>cors.exposed.headers</param-name>
        <param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>CorsFilter</filter-name>
    <url-pattern> /* </url-pattern>
</filter-mapping>