Often, an embedded appliance can consist of nothing but a statically-linked copy of busybox, an init script that mounts procfs, sysfs, &c. with busybox-provided tools, and then the actual application being invoked. With docker setting up the filesystem namespace, even that init script isn't necessarily needed.

Maintaining the BusyBox image has also been an ongoing priority at Docker. In fact, our very first container demo used BusyBox back in 2013! Users have downloaded it over one billion times, making BusyBox one of our most popular images.

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These containers also adhere to strictly-configured resource limits, support volumes, and respect your security settings. Why would you use an initContainer? According to the k8s documentation, you can do the following:

Lastly, always choose the variant which best fits your needs. You can use either busybox:uclibc, busybox:glibc, or busybox:musl as required. Options one and three are statically compiled, while glibc stems from Debian.

In Kubernetes, a sidecar container is a container thatstarts before the main application container and continues to run. This document is about init containers:containers that run to completion during Pod initialization.

If a Pod's init container fails, the kubelet repeatedly restarts that init container until it succeeds.However, if the Pod has a restartPolicy of Never, and an init container fails during startup of that Pod, Kubernetes treats the overall Pod as failed.

To specify an init container for a Pod, add the initContainers field intothe Pod specification,as an array of container items (similar to the app containers field and its contents).See Container in theAPI reference for more details.

Init containers support all the fields and features of app containers,including resource limits, volumes, and security settings. However, theresource requests and limits for an init container are handled differently,as documented in Resource sharing within containers.

Regular init containers (in other words: excluding sidecar containers) do not support thelifecycle, livenessProbe, readinessProbe, or startupProbe fields. Init containersmust run to completion before the Pod can be ready; sidecar containers continue runningduring a Pod's lifetime, and do support some probes. See sidecar containerfor further details about sidecar containers.

If you specify multiple init containers for a Pod, kubelet runs each initcontainer sequentially. Each init container must succeed before the next can run.When all of the init containers have run to completion, kubelet initializesthe application containers for the Pod and runs them as usual.

Place values into a configuration file and run a template tool to dynamicallygenerate a configuration file for the main app container. For example,place the POD_IP value in a configuration and generate the main appconfiguration file using Jinja.

This example defines a simple Pod that has two init containers.The first waits for myservice, and the second waits for mydb. Once bothinit containers complete, the Pod runs the app container from its spec section.

Each init container must exit successfully beforethe next container starts. If a container fails to start due to the runtime orexits with failure, it is retried according to the Pod restartPolicy. However,if the Pod restartPolicy is set to Always, the init containers userestartPolicy OnFailure.

A Pod cannot be Ready until all init containers have succeeded. The ports on aninit container are not aggregated under a Service. A Pod that is initializingis in the Pending state but should have a condition Initialized set to false.

Because init containers can be restarted, retried, or re-executed, init containercode should be idempotent. In particular, code that writes to files on EmptyDirsshould be prepared for the possibility that an output file already exists.

Init containers have all of the fields of an app container. However, Kubernetesprohibits readinessProbe from being used because init containers cannotdefine readiness distinct from completion. This is enforced during validation.

Use activeDeadlineSeconds on the Pod to prevent init containers from failing forever.The active deadline includes init containers.However it is recommended to use activeDeadlineSeconds only if teams deploy their applicationas a Job, because activeDeadlineSeconds has an effect even after initContainer finished.The Pod which is already running correctly would be killed by activeDeadlineSeconds if you set.

The Pod will not be restarted when the init container image is changed, or theinit container completion record has been lost due to garbage collection. Thisapplies for Kubernetes v1.20 and later. If you are using an earlier version ofKubernetes, consult the documentation for the version you are using.

The problem is that status from the busybox images, which always return "CrashLoopBackOff". In another attempt I created a pod using nginx and status is "Running". So far so good, how could I solve the status problem for busybox?

Build the Dockerfile with a new image tag:docker build -t go-server .Create and run new container from your image by running :docker run -p 8080:8080 --rm -it go-serverThe -p 8080:8080 forwards the 8080 port from the container to your local machineYou can send a curl request to :8080/, or even visit it on your browser:curl -v :8080/* Trying ::1...* TCP_NODELAY set* Connected to localhost (::1) port 8080 (#0)> GET / HTTP/1.1> Host: localhost:8080> User-Agent: curl/7.64.1> Accept: */*>< HTTP/1.1 200 OK< Date: Sat, 28 Aug 2021 09:31:38 GMT< Content-Length: 12< Content-Type: text/plain; charset=utf-8