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Troubleshooting the installation

Troubleshooting the installation program workflow

Before troubleshooting the installation environment, it is critical to understand the overall flow of the installer-provisioned installation on bare metal. The following diagrams illustrate a troubleshooting flow with a step-by-step breakdown for the environment.

Flow-Diagram-1

Workflow 1 of 4 illustrates a troubleshooting workflow when the install-config.yaml file has errors or the Red Hat Enterprise Linux CoreOS (RHCOS) images are inaccessible. See Troubleshooting install-config.yaml for troubleshooting suggestions.

Flow-Diagram-2

Workflow 2 of 4 illustrates a troubleshooting workflow for bootstrap VM issues, bootstrap VMs that cannot boot up the cluster nodes, and inspecting logs. When installing an OpenShift Container Platform cluster without the provisioning network, this workflow does not apply.

Flow-Diagram-3

Workflow 3 of 4 illustrates a troubleshooting workflow for cluster nodes that will not PXE boot. If installing using Redfish virtual media, each node must meet minimum firmware requirements for the installation program to deploy the node. See Firmware requirements for installing with virtual media in the Prerequisites section for additional details.

Flow-Diagram-4

Workflow 4 of 4 illustrates a troubleshooting workflow from a non-accessible API to a validated installation.

Troubleshooting install-config.yaml

The install-config.yaml configuration file represents all of the nodes that are part of the OpenShift Container Platform cluster. The file contains the necessary options consisting of but not limited to apiVersion, baseDomain, imageContentSources and virtual IP addresses. If errors occur early in the deployment of the OpenShift Container Platform cluster, the errors are likely in the install-config.yaml configuration file.

Procedure

  1. Use the guidelines in YAML-tips.

  2. Verify the YAML syntax is correct using syntax-check.

  3. Verify the Red Hat Enterprise Linux CoreOS (RHCOS) QEMU images are properly defined and accessible via the URL provided in the install-config.yaml. For example:

    $ curl -s -o /dev/null -I -w "%{http_code}\n" http://webserver.example.com:8080/rhcos-44.81.202004250133-0-qemu.<architecture>.qcow2.gz?sha256=7d884b46ee54fe87bbc3893bf2aa99af3b2d31f2e19ab5529c60636fbd0f1ce7

    If the output is 200, there is a valid response from the webserver storing the bootstrap VM image.

Troubleshooting bootstrap VM issues

The OpenShift Container Platform installation program spawns a bootstrap node virtual machine, which handles provisioning the OpenShift Container Platform cluster nodes.

Procedure

  1. About 10 to 15 minutes after triggering the installation program, check to ensure the bootstrap VM is operational using the virsh command:

    $ sudo virsh list
     Id    Name                           State
 --------------------------------------------
 12    openshift-xf6fq-bootstrap      running

    The name of the bootstrap VM is always the cluster name followed by a random set of characters and ending in the word "bootstrap."

  2. If the bootstrap VM is not running after 10-15 minutes, verify libvirtd is running on the system by executing the following command:

    $ systemctl status libvirtd
    ● libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2020-03-03 21:21:07 UTC; 3 weeks 5 days ago
     Docs: man:libvirtd(8)
           https://libvirt.org
 Main PID: 9850 (libvirtd)
    Tasks: 20 (limit: 32768)
   Memory: 74.8M
   CGroup: /system.slice/libvirtd.service
           ├─ 9850 /usr/sbin/libvirtd

    If the bootstrap VM is operational, log in to it.

  3. Use the virsh console command to find the IP address of the bootstrap VM:

    $ sudo virsh console example.com
    Connected to domain example.com
Escape character is ^]
Red Hat Enterprise Linux CoreOS 43.81.202001142154.0 (Ootpa) 4.3
SSH host key: SHA256:BRWJktXZgQQRY5zjuAV0IKZ4WM7i4TiUyMVanqu9Pqg (ED25519)
SSH host key: SHA256:7+iKGA7VtG5szmk2jB5gl/5EZ+SNcJ3a2g23o0lnIio (ECDSA)
SSH host key: SHA256:DH5VWhvhvagOTaLsYiVNse9ca+ZSW/30OOMed8rIGOc (RSA)
ens3:  fd35:919d:4042:2:c7ed:9a9f:a9ec:7
ens4: 172.22.0.2 fe80::1d05:e52e:be5d:263f
localhost login:

    When deploying an OpenShift Container Platform cluster without the provisioning network, you must use a public IP address and not a private IP address like 172.22.0.2.

  4. After you obtain the IP address, log in to the bootstrap VM using the ssh command:

    In the console output of the previous step, you can use the IPv6 IP address provided by ens3 or the IPv4 IP provided by ens4.

    		 
    $ ssh core@172.22.0.2

If you are not successful logging in to the bootstrap VM, you have likely encountered one of the following scenarios:

  • You cannot reach the 172.22.0.0/24 network. Verify the network connectivity between the provisioner and the provisioning network bridge. This issue might occur if you are using a provisioning network.

  • You cannot reach the bootstrap VM through the public network. When attempting to SSH via baremetal network, verify connectivity on the provisioner host specifically around the baremetal network bridge.

  • You encountered Permission denied (publickey,password,keyboard-interactive). When attempting to access the bootstrap VM, a Permission denied error might occur. Verify that the SSH key for the user attempting to log in to the VM is set within the install-config.yaml file.

Bootstrap VM cannot boot up the cluster nodes

During the deployment, it is possible for the bootstrap VM to fail to boot the cluster nodes, which prevents the VM from provisioning the nodes with the RHCOS image. This scenario can arise due to:

  • A problem with the install-config.yaml file.

  • Issues with out-of-band network access when using the baremetal network.

To verify the issue, there are three containers related to ironic:

  • ironic

  • ironic-inspector

Procedure

  1. Log in to the bootstrap VM:

    $ ssh core@172.22.0.2

  2. To check the container logs, execute the following:

    [core@localhost ~]$ sudo podman logs -f <container_name>

    Replace <container_name> with one of ironic or ironic-inspector. If you encounter an issue where the control plane nodes are not booting up from PXE, check the ironic pod. The ironic pod contains information about the attempt to boot the cluster nodes, because it attempts to log in to the node over IPMI.

Potential reason

The cluster nodes might be in the ON state when deployment started.

Solution

Power off the OpenShift Container Platform cluster nodes before you begin the installation over IPMI:

$ ipmitool -I lanplus -U root -P <password> -H <out_of_band_ip> power off

Inspecting logs

When experiencing issues downloading or accessing the RHCOS images, first verify that the URL is correct in the install-config.yaml configuration file.

Example of internal webserver hosting RHCOS images
bootstrapOSImage: http://<ip:port>/rhcos-43.81.202001142154.0-qemu.<architecture>.qcow2.gz?sha256=9d999f55ff1d44f7ed7c106508e5deecd04dc3c06095d34d36bf1cd127837e0c
clusterOSImage: http://<ip:port>/rhcos-43.81.202001142154.0-openstack.<architecture>.qcow2.gz?sha256=a1bda656fa0892f7b936fdc6b6a6086bddaed5dafacedcd7a1e811abb78fe3b0

The coreos-downloader container downloads resources from a webserver or from the external quay.io registry, whichever the install-config.yaml configuration file specifies. Verify that the coreos-downloader container is up and running and inspect its logs as needed.

Procedure

  1. Log in to the bootstrap VM:

    $ ssh core@172.22.0.2

  2. Check the status of the coreos-downloader container within the bootstrap VM by running the following command:

    [core@localhost ~]$ sudo podman logs -f coreos-downloader

    If the bootstrap VM cannot access the URL to the images, use the curl command to verify that the VM can access the images.

  3. To inspect the bootkube logs that indicate if all the containers launched during the deployment phase, execute the following:

    [core@localhost ~]$ journalctl -xe
    [core@localhost ~]$ journalctl -b -f -u bootkube.service

  4. Verify all the pods, including dnsmasq, mariadb, httpd, and ironic, are running:

    [core@localhost ~]$ sudo podman ps

  5. If there are issues with the pods, check the logs of the containers with issues. To check the logs of the ironic service, run the following command:

    [core@localhost ~]$ sudo podman logs ironic

Investigating an unavailable Kubernetes API

When the Kubernetes API is unavailable, check the control plane nodes to ensure that they are running the correct components. Also, check the hostname resolution.

Procedure

  1. Ensure that etcd is running on each of the control plane nodes by running the following command:

    $ sudo crictl logs $(sudo crictl ps --pod=$(sudo crictl pods --name=etcd-member --quiet) --quiet)

  2. If the previous command fails, ensure that Kubelet created the etcd pods by running the following command:

    $ sudo crictl pods --name=etcd-member

    If there are no pods, investigate etcd.

  3. Check the cluster nodes to ensure they have a fully qualified domain name, and not just localhost.localdomain, by using the following command:

    $ hostname

    If a hostname is not set, set the correct hostname. For example:

    $ sudo hostnamectl set-hostname <hostname>

  4. Ensure that each node has the correct name resolution in the DNS server using the dig command:

    $ dig api.<cluster_name>.example.com
    ; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el8 <<>> api.<cluster_name>.example.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37551
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 866929d2f8e8563582af23f05ec44203d313e50948d43f60 (good)
;; QUESTION SECTION:
;api.<cluster_name>.example.com. IN A

;; ANSWER SECTION:
api.<cluster_name>.example.com. 10800 IN	A 10.19.13.86

;; AUTHORITY SECTION:
<cluster_name>.example.com. 10800 IN NS	<cluster_name>.example.com.

;; ADDITIONAL SECTION:
<cluster_name>.example.com. 10800 IN A	10.19.14.247

;; Query time: 0 msec
;; SERVER: 10.19.14.247#53(10.19.14.247)
;; WHEN: Tue May 19 20:30:59 UTC 2020
;; MSG SIZE  rcvd: 140

    The output in the foregoing example indicates that the appropriate IP address for the api.<cluster_name>.example.com VIP is 10.19.13.86. This IP address should reside on the baremetal network.

Troubleshooting a failure to initialize the cluster

The installation program uses the Cluster Version Operator to create all the components of an OpenShift Container Platform cluster. When the installation program fails to initialize the cluster, you can retrieve the most important information from the ClusterVersion and ClusterOperator objects.

Procedure

  1. Inspect the ClusterVersion object by running the following command:

    $ oc --kubeconfig=${INSTALL_DIR}/auth/kubeconfig get clusterversion -o yaml
    Example output
    apiVersion: config.openshift.io/v1
kind: ClusterVersion
metadata:
  creationTimestamp: 2019-02-27T22:24:21Z
  generation: 1
  name: version
  resourceVersion: "19927"
  selfLink: /apis/config.openshift.io/v1/clusterversions/version
  uid: 6e0f4cf8-3ade-11e9-9034-0a923b47ded4
spec:
  channel: stable-4.1
  clusterID: 5ec312f9-f729-429d-a454-61d4906896ca
status:
  availableUpdates: null
  conditions:
  - lastTransitionTime: 2019-02-27T22:50:30Z
    message: Done applying 4.1.1
    status: "True"
    type: Available
  - lastTransitionTime: 2019-02-27T22:50:30Z
    status: "False"
    type: Failing
  - lastTransitionTime: 2019-02-27T22:50:30Z
    message: Cluster version is 4.1.1
    status: "False"
    type: Progressing