Iinvestigation:
- Check nodes total, be familiar with the environment (connection flow, device/software naming).
- Check resources via monitoring command and monitoring graph.
- Check network & port connection, check the firewall.
- Check variable, naming, username, hostname, domain name.
- Check Linux processes.
- Check installation guideline/steps, operation procedures.
- Check speed (network, disk i/o, CPU, memory).
- Check log messages.
- Check software dependency (library).
- Check software environment (Linux environment)/virtual environment.
- Check user, file & directory permission.
- Check, coordinate and communicate with colleagues, supervisor, and 3rd party.
- Check user and vendor.
- Check notes.
- Check history.
- Check and crosscheck with other information.
- Check browser inspection.
- Check limitation(DB connection, java max connection, kernel max connection, etc).
- Check and run the app in debug mode.
- Check and compare with another environment, another end client.
- Check how many CPU Core
- Check Java Code CPU max, consume CPU detail, is CPU enough, be economical.
- Check Rabbitmq/message queue process.
- Check is VM Host CPU is slow.
- Check is Disk limited by the provider.
- Check developer's code
- Check with system benchmark on the idle process or reboot first.
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