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Kali Linux Tutorials Kube-Applier : Enables Automated Deployment And Declarative Configuration For Your Kubernetes Cluster Kube-Applier is a service that enables continuous deployment of Kubernetes objects by applying declarative configuration files from…

acklisted is /git/repo/apps/app1.json, the line in the blacklist file should be apps/app1.json).
* WHITELIST_PATH– (string) Path to a “whitelist” file which is used to make the applier consider a specific subset of files from the repo. Only the files listed in the whitelist file will be considered for apply. Empty whitelist (or unset env var) means all files in repo are eligible to be applied. In case of a file is listed in both the whitelist and the blacklist, the file is not applied. The environment variable and file itself should formatted the same as for the blacklist above.

NOTE The blacklist and whitelist files support line comments. A single line gets ignored if the first non-blank character is # in that line.

* POLL_INTERVAL_SECONDS– (int) Number of seconds to wait between each check for new commits to the repo (default is 5). Set to 0 to disable the wait period.
* FULL_RUN_INTERVAL_SECONDS– (int) Number of seconds between automatic full runs (default is 300, or 5 minutes). Set to 0 to disable the wait period.
* DIFF_URL_FORMAT– (string) If specified, allows the status page to display a link to the source code referencing the diff for a specific commit. DIFF_URL_FORMATshould be a URL for a hosted remote repo that supports linking to a commit hash. Replace the commit hash portion with “%s” so it can be filled in by kube-applier (e.g. https://github.com/kubernetes/kubernetes/commit/%s).
* LOG_LEVEL– (int) Sets the -vflag on all kubectlcommands run. Use this option to configure more verbose logging. If not specified, the -vflag is not set on kubectlcommands defaulting to standard log verbosity. Mounting the Git Repository

There are two ways to mount the Git repository into the kube-applier container.

* Git-sync sidecar container

Git-sync keeps a local directory up to date with a remote repo. The local directory resides in a shared emptyDir volume that is mounted in both the git-sync and kube-applier containers.

Reference the git-sync repo for setup and usage.

* Host-mounted volume

Mount a Git repository from a host directory. This can be useful when you want kube-applier to apply changes to an object without checking the modified spec file into a remote repo.

“volumes”: [
{
“hostPath”: {
“path”:
},
“name”: “repo-volume”
}
…
]

What happens if the contents of the local Git repo change in the middle of a kube-applier run?

If there are changes to files in the $REPO_PATHdirectory during a kube-applier run, those changes may or may not be reflected in that run, depending on the timing of the changes.

Given that the $REPO_PATHdirectory is a Git repo or located within one, it is likely that the majority of changes will be associated with a Git commit. Thus, a change in the middle of a run will likely update the HEAD commit hash, which will immediately trigger another run upon completion of the current run (regardless of whether or not any of the changes were effective in the current run). However, changes that are not associated with a new Git commit will not trigger a run.

If I remove a configuration file, will kube-applier remove the associated Kubernetes object?

No. If a file is removed from the $REPO_PATHdirectory, kube-applier will no longer apply the file, but kube-applier WILL NOT delete the cluster object(s) described by the file. These objects must be manually cleaned up using kubectl delete. “Force Run” Feature

In rare cases, you may wish to trigger a kube-applier run without checking in a commit or waiting for the next scheduled run (e.g. some of your files failed to apply because of some background condition in the cluster, and you have fixed it since the last run). This can be accomplished with the “Force Run” button on the status pag[...]

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acklisted is /git/repo/apps/app1.json, the line in the blacklist file should be apps/app1.json). * WHITELIST_PATH– (string) Path to a “whitelist” file which is used to make the applier consider a specific subset of files from the repo. Only the files listed…

e, which starts a run immediately if no run is currently in progress, or queues a run to start upon completion of the current run. Only one run may sit in the queue at any given time. Monitoring Status UI
https://blogger.googleusercontent.com/img/a/AVvXsEiT0HSmw30M5dOnEdIVzCFPHFitj2jtI8hWuyStRpxDfQjgFUk3KMxNoPU89cSJ4XpE9lWV2cMcChakzcMxE6b-0A73L4EMQ1EXqXrU1HK7D4YENKZ9QN6nx5aFy66RcoM14y0aITGGGJkDp74QgUVLfsCirx2YgFxrlm2JjGBtr_UaXxhrhTKBCk9I=s2152
kube-applier hosts a status page on a webserver, served at the service endpoint URL. The status page displays information about the most recent apply run, including:

* Run Type
* Start and end times
* Latency
* Most recent commit
* Whitelisted files
* Blacklisted files
* Errors
* Files applied successfully

The HTML template for the status page lives in templates/status.html, and static/holds additional assets. Metrics

kube-applier uses Prometheus for metrics. Metrics are hosted on the webserver at /metrics (status UI is the index page). In addition to the Prometheus default metrics, the following custom metrics are included:

* run_latency_seconds – A Summary that keeps track of the durations of each apply run, tagged with the run type and a boolean for whether or not the run was a success (i.e. no failed apply attempts).
* file_apply_count – A Counter for each file that has had an apply attempt over the lifetime of the container, incremented with each apply attempt and tagged by the filepath and the result of the attempt.

The Prometheus HTTP API (also see the Go library) can be used for querying the metrics server. Download

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