In robotics and automation, a control loop is
a non-terminating loop that regulates the state of a system.
Bcfg2 - 0 views
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"Bcfg2 helps system administrators produce a consistent, reproducible, and verifiable description of their environment, and offers visualization and reporting tools to aid in day-to-day administrative tasks. It is the fifth generation of configuration management tools developed in the Mathematics and Computer Science Division of Argonne National Laboratory. "
Controllers | Kubernetes - 0 views
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controllers are control loops that watch the state of your cluster, then make or request changes where needed
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Each controller tries to move the current cluster state closer to the desired state.
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Monitor Node Health | Kubernetes - 0 views
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Node Problem Detector is a daemon for monitoring and reporting about a node's health
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Node Problem Detector collects information about node problems from various daemons and reports these conditions to the API server as NodeCondition and Event.
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Node Problem Detector only supports file based kernel log. Log tools such as journald are not supported.
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Google Data Studio - 0 views
ReportServer - 0 views
KNIME | Open for Innovation - 0 views
BIRT Home - 0 views
Jaspersoft Community - 0 views
How to Report Bugs Effectively - 0 views
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有個理由可以解釋為什麼技術支援工作這麼難做, 原因就是這些亂七八糟的錯誤報告
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希望全世界的人在報告任何錯誤前都能讀讀這篇短文
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錯誤報告的目的是要讓程式師能親眼目睹程式出錯
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What exactly was the point of [ "x$var" = "xval" ]? - Vidar's Blog - 0 views
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x-hack
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test "x$arg" = "x-f"
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the utility used a simple recursive descent parser without backtracking, which gave unary operators precedence over binary operators and ignored trailing arguments.
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Improving Kubernetes reliability: quicker detection of a Node down | Fatal failure - 0 views
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when a Node gets down, the pods of the broken node are still running for some time and they still get requests, and those requests, will fail.
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1- The Kubelet posts its status to the masters using –node-status-update-frequency=10s 2- A node dies 3- The kube controller manager is the one monitoring the nodes, using –-node-monitor-period=5s it checks, in the masters, the node status reported by the Kubelet. 4- Kube controller manager will see the node is unresponsive, and has this grace period –node-monitor-grace-period=40s until it considers the node unhealthy.
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node-status-update-frequency x (N-1) != node-monitor-grace-period
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Tagging AWS resources - AWS General Reference - 0 views
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assign metadata to your AWS resources in the form of tags.
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a user-defined key and value
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Tag keys are case sensitive.
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Installing Addons | Kubernetes - 0 views
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Calico is a networking and network policy provider. Calico supports a flexible set of networking options so you can choose the most efficient option for your situation, including non-overlay and overlay networks, with or without BGP. Calico uses the same engine to enforce network policy for hosts, pods, and (if using Istio & Envoy) applications at the service mesh layer.
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Cilium is a networking, observability, and security solution with an eBPF-based data plane. Cilium provides a simple flat Layer 3 network with the ability to span multiple clusters in either a native routing or overlay/encapsulation mode, and can enforce network policies on L3-L7 using an identity-based security model that is decoupled from network addressing. Cilium can act as a replacement for kube-proxy; it also offers additional, opt-in observability and security features.
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CoreDNS is a flexible, extensible DNS server which can be installed as the in-cluster DNS for pods.
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