nexus/knowledgebase/csd-wiki/ICSD/How-to-generate-flame-graph-for-specific-container_686074188.md

How-to-generate-flame-graph-for-specific-container_686074188

Introduction

This guide presents the steps to generate flamegraph for specific container

When to use this guide?

Usually when the issue happens on specific deployment and basic monitoring metrics cannot help on the troubleshooting.

Deployment

1. Deploy Krew on bastion
   1. Make sure that git is installed. 2. Run this command to download and install krew:

      (
        set -x; cd "$(mktemp -d)" &&
        OS="$(uname | tr '[:upper:]' '[:lower:]')" &&
        ARCH="$(uname -m | sed -e 's/x86_64/amd64/' -e 's/\(arm\)\(64\)\?.*/\1\2/' -e 's/aarch64$/arm64/')" &&
        KREW="krew-${OS}_${ARCH}" &&
        curl -fsSLO "https://github.com/kubernetes-sigs/krew/releases/latest/download/${KREW}.tar.gz" &&
        tar zxvf "${KREW}.tar.gz" &&
        ./"${KREW}" install krew
      )
      

      3. Add the $HOME/.krew/bin directory to your PATH environment variable. To do this, update your .bashrc or .zshrc file and append the following line:

      export PATH="${KREW_ROOT:-$HOME/.krew}/bin:$PATH"
      

      4. Run kubectl krew to check the installation.
2. Install kubectl-prof

   kubectl krew index add kubectl-prof https://github.com/josepdcs/kubectl-prof
   kubectl krew search kubectl-prof
   kubectl krew install kubectl-prof/prof
   kubectl prof --help
   

Take the flame graph

1. Find the pod / container with issue
2. Take the flame graph

   kubectl prof itom-xruntime-platform-offline-xxxxxxxxxx-xxxxx -n  itsma-xxxxx  -t 1m -l java -o flamegraph --local-path=/temp itom-xruntime-platform
   

3. Analyze on the flamegraph

Reference