- Table of Contents
- Nexus Operator
A Nexus OSS Kubernetes Operator based on the Operator SDK.
You can find us at OperatorHub or at the "Operators" tab in your OpenShift 4.x web console, just search for "Nexus". If you don't have access to OLM, try installing it manually following our quick installation guide.
If you have any questions please either open an issue or send an email to the mailing list: nexus-operator@googlegroups.com.
kubectlinstalled- Kubernetes or OpenShift cluster available (minishift, minikube or crc also supported)
- Cluster admin credentials to install the Operator
The installation procedure will create a Namespace named nexus-operator-system and will install every resources needed for the operator to run:
# requires python and kubectl
bash <(curl -s https://github.com/m88i/nexus-operator/blob/main/hack/install.sh)Alternatively, you can manually elect a released version:
VERSION=<version from GitHub releases page>
kubectl apply -f https://github.com/m88i/nexus-operator/releases/download/${VERSION}/nexus-operator.yamlYou can choose any flavors of Nexus 3.x server from our examples directory and apply the YAML in any namespace in your cluster.
Use these examples as a starting point to customize the server to meet your requirements.
If you're running the Operator on Openshift (3.11 or 4.x+) and you're not using Red Hat image with persistence enabled, that's anything other than spec.useRedHatImage: true and spec.persistence.persistent: true,
it's also necessary to configure a Security Context Constraints (SCC) resource.
This is necessary because the Nexus image requires its container to be ran as UID 200.
The use of the restricted default SCC in Openshift results in a failure when starting the pods, as seen in Issue #41 and Issue #51 (see this issue for more details on why can't the Operator handle this for you as things are now).
Valid SCC resources can be found at the examples/ directory. You must associate the SCC with the ServiceAccount in use.
For persistent configurations:
$ oc apply -f examples/scc-persistent.yaml
For volatile configurations:
$ oc apply -f examples/scc-volatile.yaml
Note: you must choose one or the other, applying both will result in using the one applied last.
Once the SCC has been created, run:
$ oc adm policy add-scc-to-user allow-nexus-userid-200 -z <ServiceAccountName>
This command will bind the SCC we just created with the ServiceAccount being used to create the Pods.
If you're using a custom ServiceAccount, replace "<ServiceAccountName>" with the name of that account.
If you're not using a custom ServiceAccount, the operator has created a default one which has the same name as your Nexus CR, replace "<ServiceAccountName>" with that.
Considering that you ran the install command above, to remove the operator completely from your cluster, just run:
make uninstallThe Nexus Operator is capable of conducting automatic updates within a minor (the y in x.y.z) when using the community default image (docker.io/sonatype/nexus3). In the future Red Hat images will also be supported by this feature.
Note: custom images will not be supported as there is no guarantee that they follow semantic versioning and as such, updates within the same minor may be disruptive.
Two fields within the Nexus CR control this behavior:
spec.automaticUpdate.disabled(boolean): Whether the Operator should perform automatic updates. Defaults tofalse(auto updates are enabled). Is set tofalseifspec.imageis not empty and is different from the default community image.spec.automaticUpdate.minorVersion(integer): The Nexus image minor version the deployment should stay in. If left blank and automatic updates are enabled the latest minor is set.
Note: if you wish to set a specific tag when using the default community image you must first disable automatic updates.
Important: a change of minors will not be monitored or acted upon as an automatic update. Changing the minor is a manual process initiated by the human operator and as such must be monitored by the human operator.
The state of ongoing updates is written to status.updateConditions, which can be easily accessed with kubectl:
$ kubectl describe nexus
# (output omitted)
Update Conditions:
Starting automatic update from 3.26.0 to 3.26.1
Successfully updated from 3.26.0 to 3.26.1
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal UpdateSuccess 59s nexus3 Successfully updated to 3.26.1
Note: do not modify these conditions manually, the Operator reconstructs the update state from these.
Once an update finishes successfully, an Event is raised. You may view the events from a particular Nexus CR by describing it:
$ kubectl describe <Nexus CR>
Or you may query all events:
$ kubectl get events
A successful update event looks like:
apiVersion: v1
count: 1
eventTime: null
firstTimestamp: "2020-08-26T13:56:16Z"
involvedObject:
apiVersion: apps.m88i.io/v1alpha1
kind: Nexus
name: nexus3
namespace: update
resourceVersion: "66087"
uid: f017e60f-21b5-4b14-b67c-341e029afae3
kind: Event
lastTimestamp: "2020-08-26T13:56:16Z"
message: Successfully updated to 3.26.1
# (output omitted)
reason: UpdateSuccess
reportingComponent: ""
reportingInstance: ""
source:
component: nexus3
type: Normal$ kubectl get events
LAST SEEN TYPE REASON OBJECT MESSAGE
12m Normal UpdateSuccess nexus/nexus3 Successfully updated to 3.26.1
# (output omitted)
When an update fails, since the Deployments produced by the Operator use a Rolling Deployment Strategy there is no disruption and the previous version is still available. The Operator will then:
- disable automatic updates
- set
spec.imageto the version that was set before the update began - raise a failure event
A failed update event looks like:
apiVersion: v1
count: 1
eventTime: null
firstTimestamp: "2020-08-21T18:29:11Z"
involvedObject:
apiVersion: apps.m88i.io/v1alpha1
kind: Nexus
name: nexus3
namespace: update
resourceVersion: "51602"
uid: 2e9ef49a-7d37-4c96-bfae-0642a9487c95
kind: Event
lastTimestamp: "2020-08-21T18:29:11Z"
message: Failed to update to 3.26.1. Human intervention may be required
# (output omitted)
reason: UpdateFailed
reportingComponent: ""
reportingInstance: ""
source:
component: nexus3
type: Warning$ kubectl get events
LAST SEEN TYPE REASON OBJECT MESSAGE
9m45s Warning UpdateFailed nexus/nexus3 Failed to update to 3.26.1. Human intervention may be required
# (output omitted)
There are three flavours for exposing the Nexus server deployed with the Nexus Operator: NodePort, Route (for OpenShift) and Ingress (for Kubernetes).
You can expose the Nexus server via NodePort by setting the following parameters in the CR:
apiVersion: apps.m88i.io/v1alpha1
kind: Nexus
metadata:
name: nexus3
spec:
(...)
networking:
expose: true
exposeAs: "NodePort"
nodePort: 31031It's not the recommended approach, but fits whatever Kubernetes flavour you have.
On OpenShift, the Nexus server can be exposed via Routes. Set the following parameters in the CR:
apiVersion: apps.m88i.io/v1alpha1
kind: Nexus
metadata:
name: nexus3
spec:
(...)
networking:
expose: trueOn Kubernetes, we leverage from an Ingress to expose the Nexus service:
apiVersion: apps.m88i.io/v1alpha1
kind: Nexus
metadata:
name: nexus3
spec:
(...)
networking:
expose: true
exposeAs: "Ingress"
host: "nexus.example.com"Please note that host is a required parameter when exposing via Ingress.
Just make sure that that the host resolves to your cluster.
If you're running on Minikube, take a look in the article "Set up Ingress on Minikube with the NGINX Ingress Controller"
If you've deployed the NGINX Ingress controller, you might see 413 ERROR - Entity too large in uploading the artifacts to the Nexus server.
You would need to enter the maximum size allowed for the data packet in the configMap for the controller.
If you've deployed the Ingress controller in Minikube it'll be available in the kube-system namespace
$ kubectl get deploy -n kube-system
NAME READY UP-TO-DATE AVAILABLE AGE
coredns 1/1 1 1 47h
ingress-nginx-controller 1/1 1 1 47h
For checking out the name of the configMap you can run:
$ kubectl get deploy/ingress-nginx-controller -o yaml -n kube-system | grep "\--configmap"
- --configmap=$(POD_NAMESPACE)/nginx-load-balancer-confNow you would need to edit the config map:
$ kubectl edit configmaps nginx-load-balancer-conf -n kube-system
In the root of the opened yaml file add:
data:
proxy-body-size: 10mNote: If you want to have no limit for the data packet you can specify the proxy-body-size: 0m
For details about TLS configuration check out our TLS guide.
On Minikube the dynamic PV creation might fail. If this happens in your environment, before creating the Nexus server, create a PV with this template: examples/pv-minikube.yaml. Then give the correct permissions to the directory in Minikube VM:
$ minikube ssh
_ _
_ _ ( ) ( )
___ ___ (_) ___ (_)| |/') _ _ | |_ __
/' _ ` _ `\| |/' _ `\| || , < ( ) ( )| '_`\ /'__`\
| ( ) ( ) || || ( ) || || |\`\ | (_) || |_) )( ___/
(_) (_) (_)(_)(_) (_)(_)(_) (_)`\___/'(_,__/'`\____)
$ sudo chown 200:200 -R /data/pv0001/
$ ls -la /data/
total 8
drwxr-xr-x 3 root root 4096 Apr 26 15:42 .
drwxr-xr-x 19 root root 500 Apr 26 20:47 ..
drwxr-xr-x 2 200 200 4096 Apr 26 15:42 pv0001It is possible to use a custom ServiceAccount to perform your Deployments with the Nexus Operator via:
spec.serviceAccountName(string): ServiceAccountName is the name of the ServiceAccount used to run the Pods. If left blank, a default ServiceAccount is created with the same name as the Nexus CR.
Important: the Operator handles the creation of default resources necessary to run. If you choose to use a custom ServiceAccount be sure to also configure Role and RoleBinding resources.
By default, from version 0.3.0 the Nexus Operator does not generate a random password for the admin user. This means that you can login in the server right away with the default administrator credentials (admin/admin123). Comes in handy for development purposes, but consider changing this password right away on production environments.
To enable random password generation, you can set the attribute generateRandomAdminPassword in the Nexus CR spec to true. Then the Nexus service will create a random password in the file system. You have to grab the password from a file inside the Nexus Server container in order to login in the web console:
$ kubectl exec <nexus server pod name> -- cat /nexus-data/admin.password
Use this password to login into the web console with the username admin.
If you have access to Red Hat Catalog, you might change the flag spec.useRedHatImage to true.
You'll have to set your Red Hat credentials in the namespace where Nexus is deployed to be able to pull the image.
In future versions the Operator will handle this step for you.
You can control the pods Image Pull Policy using the spec.imagePullPolicy field. It accepts either of the following values:
AlwaysIfNotPresentNever
If this field is set to an invalid value this configuration will be omitted, deferring to Kubernetes default behavior, which is Always if the image's tag is "latest" and IfNotPresent otherwise.
Leaving this field blank will also result in deferring to Kubernetes default behavior.
From 0.3.0 version, the Operator will try to create an administrator user to be used on internal operations, such as creating community Maven repositories.
The default Nexus user admin is used to create the nexus-operator user, whose credentials are then stored in a secret with the same name as the Nexus CR.
It's possible to disable the operator user creation by setting spec.serverOperatons.disableOperatorUserCreation to true. In this case, the admin user will be used instead. This configuration is not recommended, since you can track all the operations, change the operator user permissions and enable or disable it if you need. By disabling the operator user creation, the Operator will use the default admin credentials to perform all server operations, which will fail if you change the default credentials (something that must be done when aiming for a secure environment).
The Operator also will create three Maven repositories by default:
All of these repositories will be also added to the maven-public group. This group will gather the vast majority of jars needed by the most common use cases out there. If you won't need them, just disable this behavior by setting the attribute spec.serverOperatons.disableRepositoryCreation to true in the Nexus CR.
All of these operations are disabled if the attribute spec.generateRandomAdminPassword is set to true, since default credentials are needed to create the nexus-operator user. You can safely change the default credentials after this user has been created.
For now, the Nexus Operator won't accept a number higher than 1 to the spec.replicas attribute.
This is because the Nexus server can't share its mounted persistent volume with other pods. See #191 for more details.
Horizontal scaling will only work once we add HA support to the operator (see #61). If you need to scale the server, you should take the vertical approach and increase the numbers of resource limits used by the Nexus server. For example:
apiVersion: apps.m88i.io/v1alpha1
kind: Nexus
metadata:
name: nexus3
spec:
replicas: 1
# Set the resources requests and limits for Nexus pods. See: https://help.sonatype.com/repomanager3/system-requirements
resources:
limits:
cpu: "4"
memory: "8Gi"
requests:
cpu: "1"
memory: "2Gi"
persistence:
persistent: true
volumeSize: 10GiWe are working to support HA in the future.
Please read our Contribution Guide.