Chapter 4. Understanding OpenShift Container Platform update duration
Chapter 4. Understanding OpenShift Container Platform update duration OpenShift Container Platform update duration varies based on the deployment topology. This page helps you understand the factors that affect update duration and estimate how long the cluster update takes in your environment. 4.1. Prerequisites You are familiar with OpenShift Container Platform architecture and OpenShift Container Platform updates . 4.2. Factors affecting update duration The following factors can affect your cluster update duration: The reboot of compute nodes to the new machine configuration by Machine Config Operator (MCO) The value of MaxUnavailable in the machine config pool Warning The default setting for maxUnavailable is 1 for all the machine config pools in OpenShift Container Platform. It is recommended to not change this value and update one control plane node at a time. Do not change this value to 3 for the control plane pool. The minimum number or percentages of replicas set in pod disruption budget (PDB) The number of nodes in the cluster The health of the cluster nodes 4.3. Cluster update phases In OpenShift Container Platform, the cluster update happens in two phases: Cluster Version Operator (CVO) target update payload deployment Machine Config Operator (MCO) node updates 4.3.1. Cluster Version Operator target update payload deployment The Cluster Version Operator (CVO) retrieves the target update release image and applies to the cluster. All components which run as pods are updated during this phase, whereas the host components are updated by the Machine Config Operator (MCO). This process might take 60 to 120 minutes. Note The CVO phase of the update does not restart the nodes. Additional resources Introduction to OpenShift Updates 4.3.2. Machine Config Operator node updates The Machine Config Operator (MCO) applies a new machine configuration to each control plane and compute node. During this process, the MCO performs the following sequential actions on each node of the cluster: Cordon and drain all the nodes Update the operating system (OS) Reboot the nodes Uncordon all nodes and schedule workloads on the node Note When a node is cordoned, workloads cannot be scheduled to it. The time to complete this process depends on several factors including the node and infrastructure configuration. This process might take 5 or more minutes to complete per node. In addition to MCO, you should consider the impact of the following parameters: The control plane node update duration is predictable and oftentimes shorter than compute nodes, because the control plane workloads are tuned for graceful updates and quick drains. You can update the compute nodes in parallel by setting the maxUnavailable field to greater than 1 in the Machine Config Pool (MCP). The MCO cordons the number of nodes specified in maxUnavailable and marks them unavailable for update. When you increase maxUnavailable on the MCP, it can help the pool to update more quickly. However, if maxUnavailable is set too high, and several nodes are cordoned simultaneously, the pod disruption budget (PDB) guarded workloads could fail to drain because a schedulable node cannot be found to run the replicas. If you increase maxUnavailable for the MCP, ensure that you still have sufficient schedulable nodes to allow PDB guarded workloads to drain. Before you begin the update, you must ensure that all the nodes are available. Any unavailable nodes can significantly impact the update duration because the node unavailability affects the maxUnavailable and pod disruption budgets. To check the status of nodes from the terminal, run the following command: USD oc get node Example Output NAME STATUS ROLES AGE VERSION ip-10-0-137-31.us-east-2.compute.internal Ready,SchedulingDisabled worker 12d v1.23.5+3afdacb ip-10-0-151-208.us-east-2.compute.internal Ready master 12d v1.23.5+3afdacb ip-10-0-176-138.us-east-2.compute.internal Ready master 12d v1.23.5+3afdacb ip-10-0-183-194.us-east-2.compute.internal Ready worker 12d v1.23.5+3afdacb ip-10-0-204-102.us-east-2.compute.internal Ready master 12d v1.23.5+3afdacb ip-10-0-207-224.us-east-2.compute.internal Ready worker 12d v1.23.5+3afdacb If the status of the node is NotReady or SchedulingDisabled , then the node is not available and this impacts the update duration. You can check the status of nodes from the Administrator perspective in the web console by expanding Compute Nodes . Additional resources Machine config overview Pod disruption budget 4.4. Estimating cluster update time Historical update duration of similar clusters provides you the best estimate for the future cluster updates. However, if the historical data is not available, you can use the following convention to estimate your cluster update time: A node update iteration consists of one or more nodes updated in parallel. The control plane nodes are always updated in parallel with the compute nodes. In addition, one or more compute nodes can be updated in parallel based on the maxUnavailable value. Warning The default setting for maxUnavailable is 1 for all the machine config pools in OpenShift Container Platform. It is recommended to not change this value and update one control plane node at a time. Do not change this value to 3 for the control plane pool. For example, to estimate the update time, consider an OpenShift Container Platform cluster with three control plane nodes and six compute nodes and each host takes about 5 minutes to reboot. Note The time it takes to reboot a particular node varies significantly. In cloud instances, the reboot might take about 1 to 2 minutes, whereas in physical bare metal hosts the reboot might take more than 15 minutes. Scenario-1 When you set maxUnavailable to 1 for both the control plane and compute nodes Machine Config Pool (MCP), then all the six compute nodes will update one after another in each iteration: Scenario-2 When you set maxUnavailable to 2 for the compute node MCP, then two compute nodes will update in parallel in each iteration. Therefore it takes total three iterations to update all the nodes. Important The default setting for maxUnavailable is 1 for all the MCPs in OpenShift Container Platform. It is recommended that you do not change the maxUnavailable in the control plane MCP. 4.5. Red Hat Enterprise Linux (RHEL) compute nodes Red Hat Enterprise Linux (RHEL) compute nodes require an additional usage of openshift-ansible to update node binary components. The actual time spent updating RHEL compute nodes should not be significantly different from Red Hat Enterprise Linux CoreOS (RHCOS) compute nodes. Additional resources Updating RHEL compute machines
oc get node NAME STATUS ROLES AGE VERSION ip-10-0-137-31.us-east-2.compute.internal Ready,SchedulingDisabled worker 12d v1.23.5+3afdacb ip-10-0-151-208.us-east-2.compute.internal Ready master 12d v1.23.5+3afdacb ip-10-0-176-138.us-east-2.compute.internal Ready master 12d v1.23.5+3afdacb ip-10-0-183-194.us-east-2.compute.internal Ready worker 12d v1.23.5+3afdacb ip-10-0-204-102.us-east-2.compute.internal Ready master 12d v1.23.5+3afdacb ip-10-0-207-224.us-east-2.compute.internal Ready worker 12d v1.23.5+3afdacb Cluster update time = CVO target update payload deployment time + (# node update iterations x MCO node update time) Cluster update time = 60 + (6 x 5) = 90 minutes Cluster update time = 60 + (3 x 5) = 75 minutes