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Distributions and ways to install Two distributions : – a community package called ansible = Ansible language and runtime + many collections (Ansible extensions) – a minimalist language called ansible-core (called ansible-base in version 2.10) = Ansible language and runtime … Continuer la lecture →

Warning : WRK is great but written in C and not updated and maintained any longer for several years How to install Download a tagged version or clone the repository of the application and run the make command to build it. … Continuer la lecture →

Two ways to use it – Use one of the official client libraries (C, dotnet, Go, Hashkell, Java, JavaScript, Perl, Python, Ruby) – Use the curl command REST API endpoint – OpenAPI V2: /openapi/v2 endpoint – OpenAPI V3: /openapi/v3 endpoint … Continuer la lecture →

Prometheus config Example Here is a sample configuration that defines several jobs. All don’t require credentials but workers that require it. # my global config global: scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every … Continuer la lecture →

Configuration sample Kubernetes fields added by the kubernetes processor kubernetes.pod.name type: keyword   kubernetes.pod.uid type: keyword   kubernetes.pod.ip type: ip   kubernetes.namespace type: keyword   kubernetes.node.name type: keyword   kubernetes.node.hostname (Kubernetes hostname as reported by the node’s kernel) type: keyword … Continuer la lecture →

Docker logging drivers How to know the default Logging driver ? docker info –format ‘{{.LoggingDriver}}’ The default : the json-file logging driver Each Docker daemon has a default logging driver, which each container uses unless you configure it to use … Continuer la lecture →

kubelet GC deletes very frequently unused docker images/containers Symptoms : kubelet logs show messages such as : kubelet[5105]: I0428 15:55:45.440934 5105 image_gc_manager.go:305] [imageGCManager]: Disk usage on image filesystem is at 86% which is over the high threshold (85%). Trying to free … Continuer la lecture →

What is a DaemonSet ? A DaemonSet is a resource that ensures that all (or some) Nodes run a copy of a Pod. As nodes are added to the cluster, Pods are added to them. As nodes are removed from … Continuer la lecture →

yml manifest or operator ? Operator is a specific program dedicated to calico lifecyle management in k8s yml manifest is the « old » way. It relies on deploying the calico resources on kubernetes via kubctl and a k8s yml. yml manifest … Continuer la lecture →

Node Allocatable The general idea : Node Capacity ————————— | kube-reserved | |————————-| | system-reserved | |————————-| | eviction-threshold | |————————-| | | | allocatable | | (available for pods) | | | | | Node resource information : – … Continuer la lecture →