Troubleshoot high CPU usage java process


This is a real troubleshooting example that I just did yesterday for a high CPU usage java application. The application uses tomcat and runs on AWS EC2. Login into the box, and change to root user so you can see all users' process. sudo su - Install htop if you have not installed it before, the run it. … Continue reading Troubleshoot high CPU usage java process

Error response from daemon: Get https://index.docker.io/v1/…: x509: certificate signed by unknown authority


Error response from daemon: Get https://index.docker.io/v1/...: x509: certificate signed by unknown authority You have probably seen similar errors as above when trying to access dockerhub registry behind a corp proxy. I have the same issue here. And I think the issue may be caused by two reasons: 1) index.docker.io now is redirected to registry.hub.docker.com 2) Your … Continue reading Error response from daemon: Get https://index.docker.io/v1/…: x509: certificate signed by unknown authority