5/7/2023 0 Comments Kubectl logs![]() ![]() This can be set to allow having multiple instances of minikube independently. p, -profile string The name of the minikube VM being used. one_output If true, only write logs to their native severity level (vs also writing to each lower severity level no effect when -logtostderr=true) logtostderr log to standard error instead of files If the value is 0, the maximum file size is unlimited. log_file_max_size uint Defines the maximum size a log file can grow to (no effect when -logtostderr=true). log_file string If non-empty, use this log file (no effect when -logtostderr=true) log_dir string If non-empty, write log files in this directory (no effect when -logtostderr=true) log_backtrace_at traceLocation when logging hits line file:N, emit a stack trace (default :0) b, -bootstrapper string The name of the cluster bootstrapper that will set up the Kubernetes cluster. alsologtostderr log to standard error as well as files (no effect when -logtostderr=true) Options inherited from parent commands -add_dir_header If true, adds the file directory to the header of the log messages problems Show only log entries which point to known problems n, -length int Number of lines back to go within the log (default 60) last-start-only Show only the last start logs. f, -follow Show only the most recent journal entries, and continuously print new entries as they are appended to the journal. If you run the local Kubernetes set up using Vagrant you’ll notice that the ~/.kube/config file gets set up automatically after the clusters comes up you’ll also feel comforted that the scripts which provision kubernetes inside vagrant also use these commands to set up your ~/.-file string If present, writes to the provided file instead of stdout. To change the context it’s as simple as kubectl config use-context again. Now all commands will be sent within this context and to this cluster that we’ve configured. Now to use this specific context (of which there may be many), we can tell kubectl to use it: kubectl config use-context default / foo. ![]() We’re naming our context default//kubeuser which designates namespace/cluster-name/cluster-user. Using (and properly organizing) our different contexts, we can quickly switch across multiple clusters: kubectl config set-context default / foo. Now we need to create a “context.” This context basically points to the cluster with a specific user. If you have a highly available master then point to the load-balanced cluster of masters. ![]() Here we’ve configured a URI that points to a kubernetes master and given it a name that matches what we used when we created the user credentials. insecure-skip-tls-verify = true -server = https :// foo. Next we need to point to a cluster: kubectl config set-cluster foo. So we named this credential kubeuser/ where kubeuser is the user and is a cluster URI. We name the “credential” following a specific pattern (though this is a good convention, not mandatory – the credential name can be anything) – we may have a many-to-many relationship between user names and clusters, so following a pattern that allows you to differentiate a kubeuser from one cluster and a different one is useful. username = kubeuser -password = kubepassword To do this, we run set-credentials command: kubectl config set-credentials kubeuser / foo. To add a new cluster, we need to add a user/principal that will be used when connecting to the cluster. Nevertheless, it helps to have a convention to follow when adding to this file which we’ll cover here.įirst, if you run the following, you’ll see an example kube-config file (~/.kube/config) kubectl config view You could theoretically edit this by hand as well, but the tool will keep things formatted properly, and disallow characters and names that cannot be used. So we need to use the kubectl cli to manipulate the configuration file that kubectl uses. The kubernetes docs on the subject cover most of this, but I’m hoping to add a little more detail.īasically, kubectl doesn’t have a ‘login’ command. I’ve not found a good way to login to multiple Kubernetes clusters (well, actually I have: using the OpenShift oc command-line client, which has a login command which basically automates all of the below) out of the box, so here’s a quick intro to the kubectl command-line config commands that let us configure our different cluster credentials, users, and namespaces to quickly switch between clusters or namespaces within a cluster: The kubectl command line client is a versatile way to interact with a Kubernetes cluster, including managing multiple clusters. ![]()
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