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Add agent fleet enrolment k8s manifest #26566

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Jul 7, 2021
Merged

Add agent fleet enrolment k8s manifest #26566

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67f8962
Add manifest for agent automatic enrolment to fleet
MichaelKatsoulis Jun 29, 2021
4d526ec
Add elastic-agent-managed dir with all manifests and update Makefile
MichaelKatsoulis Jun 29, 2021
fefeb93
Removing leading dashes
MichaelKatsoulis Jun 29, 2021
08e9149
Review updates
MichaelKatsoulis Jul 1, 2021
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2 changes: 1 addition & 1 deletion deploy/kubernetes/Makefile
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
ALL=filebeat metricbeat auditbeat heartbeat elastic-agent-standalone
ALL=filebeat metricbeat auditbeat heartbeat elastic-agent-standalone elastic-agent-managed
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@ruflin do you think naming is ok here? Should we call it just elastic-agent maybe? Or elastic-agent-fleet? elastic-agent-managed is fine for me too.

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No strong preference. managed looks fine as we have also standalone.

BEAT_VERSION=$(shell head -n 1 ../../libbeat/docs/version.asciidoc | cut -c 17- )

.PHONY: all $(ALL)
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209 changes: 209 additions & 0 deletions deploy/kubernetes/elastic-agent-managed-kubernetes.yaml
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apiVersion: apps/v1
kind: DaemonSet
metadata:
name: elastic-agent
namespace: kube-system
labels:
app: elastic-agent
spec:
selector:
matchLabels:
app: elastic-agent
template:
metadata:
labels:
app: elastic-agent
spec:
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
serviceAccountName: elastic-agent
hostNetwork: true
dnsPolicy: ClusterFirstWithHostNet
containers:
- name: elastic-agent
image: docker.elastic.co/beats/elastic-agent:8.0.0
env:
- name: FLEET_ENROLL
value: "1"
# Set to true in case of insecure or unverified HTTP
- name: FLEET_INSECURE
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I'm worried about this, FLEET_INSECURE option. Do we have a way to go with the secure approach? @mtojek any ideas?

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If the fleet server is deployed in elastic cloud or in a cloud with trusted CA then FLEET_INSECURE can be false which is default value.
If it is deployed in another cluster with tls enabled and self signed certificates then FLEET_CA has to be used and the CA needs to be mounted.
If tls is not enabled (a fine option for private cloud) then FLEET_INSECURE has to be set to 1.
In our case as it is a proposed manifest I believe we should leave the default value and add a comment on top of the variable of its purpose.

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Thanks for clarifying, I think we are ok for now and we can iterate on it later if we see requests for that.

value: false
# The ip:port pair of fleet server
- name: FLEET_URL
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Can we add a description in a comment about this var and maybe a sample value (in the comment)? I expect users having difficulties in recognising what value they should put here.

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Description added. The weird part on the url is that the port is not implied by the protocol and it must be added in the end.

value: "https://fleet-server:8220"
- name: KIBANA_HOST
value: "http://kibana:5601"
- name: KIBANA_FLEET_USERNAME
value: "elastic"
- name: KIBANA_FLEET_PASSWORD
value: ""
- name: NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
securityContext:
runAsUser: 0
resources:
limits:
memory: 200Mi
requests:
cpu: 100m
memory: 100Mi
volumeMounts:
- name: proc
mountPath: /hostfs/proc
readOnly: true
- name: cgroup
mountPath: /hostfs/sys/fs/cgroup
readOnly: true
- name: varlibdockercontainers
mountPath: /var/lib/docker/containers
readOnly: true
- name: varlog
mountPath: /var/log
readOnly: true
volumes:
- name: proc
hostPath:
path: /proc
- name: cgroup
hostPath:
path: /sys/fs/cgroup
- name: varlibdockercontainers
hostPath:
path: /var/lib/docker/containers
- name: varlog
hostPath:
path: /var/log
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: elastic-agent
subjects:
- kind: ServiceAccount
name: elastic-agent
namespace: kube-system
roleRef:
kind: ClusterRole
name: elastic-agent
apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
namespace: kube-system
name: elastic-agent
subjects:
- kind: ServiceAccount
name: elastic-agent
namespace: kube-system
roleRef:
kind: Role
name: elastic-agent
apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: elastic-agent-kubeadm-config
namespace: kube-system
subjects:
- kind: ServiceAccount
name: elastic-agent
namespace: kube-system
roleRef:
kind: Role
name: elastic-agent-kubeadm-config
apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: elastic-agent
labels:
k8s-app: elastic-agent
rules:
- apiGroups: [""]
resources:
- nodes
- namespaces
- events
- pods
- services
- configmaps
verbs: ["get", "list", "watch"]
# Enable this rule only if planing to use kubernetes_secrets provider
#- apiGroups: [""]
# resources:
# - secrets
# verbs: ["get"]
- apiGroups: ["extensions"]
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resources:
- replicasets
verbs: ["get", "list", "watch"]
- apiGroups: ["apps"]
resources:
- statefulsets
- deployments
- replicasets
verbs: ["get", "list", "watch"]
- apiGroups:
- ""
resources:
- nodes/stats
verbs:
- get
- apiGroups: [ "batch" ]
resources:
- jobs
verbs: [ "get", "list", "watch" ]
# required for apiserver
- nonResourceURLs:
- "/metrics"
verbs:
- get
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: elastic-agent
# should be the namespace where elastic-agent is running
namespace: kube-system
labels:
k8s-app: elastic-agent
rules:
- apiGroups:
- coordination.k8s.io
resources:
- leases
verbs: ["get", "create", "update"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: elastic-agent-kubeadm-config
namespace: kube-system
labels:
k8s-app: elastic-agent
rules:
- apiGroups: [""]
resources:
- configmaps
resourceNames:
- kubeadm-config
verbs: ["get"]
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: elastic-agent
namespace: kube-system
labels:
k8s-app: elastic-agent
---
82 changes: 82 additions & 0 deletions deploy/kubernetes/elastic-agent-managed/elastic-agent-managed-daemonset.yaml
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apiVersion: apps/v1
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  1. This might be my ignorance, but why do we keep them in two directories (deploy/kubernetes/elastic-agent-managed vs deploy/kubernetes) ?
    I'm asking as most likely I'm interested in replacing the https://github.com/elastic/elastic-package/blob/master/internal/install/static_kubernetes_elastic_agent_yml.go with something more sophisticated and as small as possible.

  2. Is it only an example or is it tested by CI somehow?

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@MichaelKatsoulis MichaelKatsoulis Jun 29, 2021 •
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  1. This is a good question. In deploy/kubernetes/elastic-agent-managed the manifests are splited by kind while in the deploy/kubernetes it is just one manifest for all. I followed the pattern of the rest. Maybe this gives users more flexibility on how to deploy the manifests and which to deploy. @ChrsMark do you know if there is another reason?

  2. I have tested it locally with the snapshot image version and elastic stack in elastic cloud.

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  1. Under deploy/kubernetes/elastic-agent-managed the manifests are split per kind as @MichaelKatsoulis explained. Then deploy/kubernetes/elastic-agent-managed.yml is the final complete manifest based on them if you run make all (see Makefile in same directory). To be honest I don't really know the reason for this but we keep doing like this so far.
  2. CI only tests that these manifests are valid as far as I know. See lint stage at

    beats/deploy/kubernetes/Jenkinsfile.yml

    Line 15 in f4c570b

    lint:

kind: DaemonSet
metadata:
name: elastic-agent
namespace: kube-system
labels:
app: elastic-agent
spec:
selector:
matchLabels:
app: elastic-agent
template:
metadata:
labels:
app: elastic-agent
spec:
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
serviceAccountName: elastic-agent
hostNetwork: true
dnsPolicy: ClusterFirstWithHostNet
containers:
- name: elastic-agent
image: docker.elastic.co/beats/elastic-agent:8.0.0
env:
- name: FLEET_ENROLL
value: "1"
# Set to true in case of insecure or unverified HTTP
- name: FLEET_INSECURE
value: false
# The ip:port pair of fleet server
- name: FLEET_URL
value: "https://fleet-server:8220"
- name: KIBANA_HOST
value: "http://kibana:5601"
- name: KIBANA_FLEET_USERNAME
value: "elastic"
- name: KIBANA_FLEET_PASSWORD
value: ""
- name: NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
securityContext:
runAsUser: 0
resources:
limits:
memory: 200Mi
requests:
cpu: 100m
memory: 100Mi
volumeMounts:
- name: proc
mountPath: /hostfs/proc
readOnly: true
- name: cgroup
mountPath: /hostfs/sys/fs/cgroup
readOnly: true
- name: varlibdockercontainers
mountPath: /var/lib/docker/containers
readOnly: true
- name: varlog
mountPath: /var/log
readOnly: true
volumes:
- name: proc
hostPath:
path: /proc
- name: cgroup
hostPath:
path: /sys/fs/cgroup
- name: varlibdockercontainers
hostPath:
path: /var/lib/docker/containers
- name: varlog
hostPath:
path: /var/log
40 changes: 40 additions & 0 deletions deploy/kubernetes/elastic-agent-managed/elastic-agent-managed-role-binding.yaml
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apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: elastic-agent
subjects:
- kind: ServiceAccount
name: elastic-agent
namespace: kube-system
roleRef:
kind: ClusterRole
name: elastic-agent
apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
namespace: kube-system
name: elastic-agent
subjects:
- kind: ServiceAccount
name: elastic-agent
namespace: kube-system
roleRef:
kind: Role
name: elastic-agent
apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: elastic-agent-kubeadm-config
namespace: kube-system
subjects:
- kind: ServiceAccount
name: elastic-agent
namespace: kube-system
roleRef:
kind: Role
name: elastic-agent-kubeadm-config
apiGroup: rbac.authorization.k8s.io
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