wfhartford

JVM Container Support

In version 8u131, the JVM became container aware. That means basically two things:

1. The JVM will set its max heap space based on the cgroup's memory limit, taking most of that limit for the heap.
2. The JVM will set its number of available processors based on the cgroup's settings for cpu_shares and/or cpu_quota depending on the JVM version.

The first point (memory) is somewhat useful, it provides a more reasonable default for max heap space when the JVM is run in a container. Heap space can still be set directly via the -Xmx and/or -Xms flags, and probably should be most of the time.

The second point is somewhat less helpful, and potentially quite harmful, especially in Kubernetes. Kubernetes' pods resource CPU request and limit values control the cpu_shares and cpu_quota respectively (see https://christopher-batey.medium.com/cpu-considerations-for-java-applications-running-in-docker-and-kubernetes-7925865235b7 for more details). For now, it's enough to know that if

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apiVersion: cert-manager.io/v1alpha2
kind: Certificate
metadata:
  name: juicy-admin-apm-server
spec:
  secretName: juicy-admin-apm-http-juicy-admin-svc-cluster-local-tls
  issuerRef:
    kind: Issuer
    name: juicy-admin-vault
  duration: 48h

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apiVersion: elasticsearch.k8s.elastic.co/v1
kind: Elasticsearch
metadata:
  name: juicy-admin
spec:
  version: 7.8.0
  nodeSets:
    - name: default
      count: 3
      volumeClaimTemplates:

wfhartford

apiVersion: kops/v1alpha2
kind: Cluster
metadata:
  creationTimestamp: 2019-02-22T19:40:22Z
  name: sd-dev-k8s.zedev.net
spec:
  api:
    loadBalancer:
      type: Public
  authorization:

wfhartford

I0222 19:40:16.157711    7926 create_cluster.go:1456] Using SSH public key: /home/ubuntu/.ssh/id_rsa.pub
I0222 19:40:16.157902    7926 factory.go:68] state store swift://kops-state-store
I0222 19:40:16.158069    7926 swiftfs.go:66] authenticating to keystone
I0222 19:40:16.731107    7926 swiftfs.go:418] Reading file "swift://kops-state-store/sd-dev-k8s.zedev.net/config"
I0222 19:40:17.114127    7926 channel.go:97] resolving "stable" against default channel location "https://raw.githubusercontent.com/kubernetes/kops/master/channels/"
I0222 19:40:17.114291    7926 channel.go:102] Loading channel from "https://raw.githubusercontent.com/kubernetes/kops/master/channels/stable"
I0222 19:40:17.114434    7926 context.go:159] Performing HTTP request: GET https://raw.githubusercontent.com/kubernetes/kops/master/channels/stable
I0222 19:40:17.322743    7926 channel.go:111] Channel contents: spec:
  images:
    # We put the "legacy" version first, for kops versions that don't support versions ( < 1.5.0 )

wfhartford

import org.apache.maven.shared.dependency.analyzer.ClassAnalyzer
import org.apache.maven.shared.dependency.analyzer.DefaultClassAnalyzer
import org.apache.maven.shared.dependency.analyzer.DependencyAnalyzer
import org.apache.maven.shared.dependency.analyzer.ProjectDependencyAnalysis
import org.apache.maven.shared.dependency.analyzer.asm.ASMDependencyAnalyzer
import org.gradle.api.Project
import org.gradle.api.artifacts.ConfigurationContainer
import org.gradle.api.artifacts.ResolvedArtifact
import org.gradle.api.artifacts.ResolvedDependency