fix: rootless k8s integration tests (#5290)

* fix: remove redundant setcap on agentbeat

* fix: add required capabilities for rootless agent

* fix: increase agent resources to prevent OOM restarts

Author: pkoutsovasilis

dev-tools/packaging/templates/docker/Dockerfile.elastic-agent.tmpl

@@ -56,8 +56,7 @@ RUN true && \
     true
 
 # Keep this after any chown command, chown resets any applied capabilities
-RUN setcap =p {{ $beatHome }}/data/elastic-agent-{{ commit_short }}/elastic-agent
-RUN setcap cap_net_raw,cap_setuid+p {{ $beatHome }}/data/elastic-agent-{{ commit_short }}/components/agentbeat && \
+RUN setcap =p {{ $beatHome }}/data/elastic-agent-{{ commit_short }}/elastic-agent && \
 {{- if .linux_capabilities }}
 # Since the beat is stored at the other end of a symlink we must follow the symlink first
 # For security reasons setcap does not support symlinks. This is smart in the general case

testing/integration/kubernetes_agent_standalone_test.go

@@ -30,6 +30,7 @@ import (
 	batchv1 "k8s.io/api/batch/v1"
 	corev1 "k8s.io/api/core/v1"
 	rbacv1 "k8s.io/api/rbac/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/serializer"
@@ -122,18 +123,18 @@ func TestKubernetesAgentStandalone(t *testing.T) {
 			int64Ptr(1000), // elastic-agent uid
 			nil,
 			[]corev1.Capability{"ALL"},
-			[]corev1.Capability{"CHOWN", "SETPCAP"},
+			[]corev1.Capability{"CHOWN", "SETPCAP", "DAC_READ_SEARCH", "SYS_PTRACE"},
 			true,
-			"https://github.com/elastic/elastic-agent/issues/5275",
+			"",
 		},
 		{
 			"drop ALL add CHOWN, SETPCAP capabilities - rootless agent random uid:gid",
 			int64Ptr(500),
 			int64Ptr(500),
 			[]corev1.Capability{"ALL"},
-			[]corev1.Capability{"CHOWN", "SETPCAP", "DAC_READ_SEARCH"},
+			[]corev1.Capability{"CHOWN", "SETPCAP", "DAC_READ_SEARCH", "SYS_PTRACE"},
 			true,
-			"https://github.com/elastic/elastic-agent/issues/5275",
+			"",
 		},
 	}
 
@@ -160,6 +161,10 @@ func TestKubernetesAgentStandalone(t *testing.T) {
 					// as the image is already loaded by the kubernetes provisioner
 					container.ImagePullPolicy = "Never"
 
+					container.Resources.Limits = corev1.ResourceList{
+						corev1.ResourceMemory: resource.MustParse("800Mi"),
+					}
+
 					if tc.capabilitiesDrop != nil || tc.capabilitiesAdd != nil || tc.runUser != nil || tc.runGroup != nil {
 						// set security context
 						container.SecurityContext = &corev1.SecurityContext{