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kandi X-RAY | busybox Summary
kandi X-RAY | busybox Summary
please see the license file for details on copying and usage. please refer to the install file for instructions on how to build. busybox combines tiny versions of many common unix utilities into a single small executable. it provides minimalist replacements for most of the utilities you usually find in bzip2, coreutils, dhcp, diffutils, e2fsprogs, file, findutils, gawk, grep, inetutils, less, modutils, net-tools, procps, sed, shadow, sysklogd, sysvinit, tar, util-linux, and vim. the utilities in busybox often have fewer options than their full-featured cousins; however, the options that are included provide the expected functionality and behave very much like their larger counterparts. busybox has been written with size-optimization and limited resources in mind, both to produce small binaries and to reduce run-time memory usage. busybox is also extremely modular so you can easily include or exclude commands (or features) at compile time. this makes it easy to customize embedded systems; to create a working system, just add /dev, /etc, and a linux kernel. busybox (usually together with uclibc) has also been used as a component of "thin client" desktop systems, live-cd distributions, rescue disks, installers, and so on. busybox provides a fairly complete posix environment for any small system, both embedded environments and more full featured systems concerned about
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QUESTION
I've found following docker composition:
...ANSWER
Answered 2021-Jun-09 at 10:30On modern Docker I'd never use this pattern, and in particular I'd avoid volumes_from:
.
volumes_from:
has the two problems of not being clear of what exactly it's mounting and not having any control over where it gets mounted. If the image for your backup
had a VOLUME
declaration in its Dockerfile, for example, that volume would get mounted in your cron
container at the exact same path as in the backup
container, even though it's not listed in this docker-compose.yml
anywhere. That can lead to surprising outcomes.
Docker didn't always have named volumes. Before there were named volumes, the way to get persistent sharable storage was to create a data volume container that created an anonymous volume, and then run other containers with docker run --volumes-from ...
to attach that storage. Now that named volumes exist, there's not a need to do that any more.
QUESTION
I have the terraform file main.tf
that used to create AWS resources:
ANSWER
Answered 2021-Jun-06 at 18:19Remove the .terraform folder and try terraform init
again
OR
error is because there's no S3 bucket created to sync with.
- remove json object of s3 in .terraform/terraform.tfstate
- remove the object generating remote backend run
- terraform init
QUESTION
I'm trying to deploy the ELK stack to my developing kubernetes cluster. It seems that I do everything as described in the tutorials, however, the pods keep failing with Java errors (see below). I will describe the whole process from installing the cluster until the error happens.
Step 1: Installing the cluster
...ANSWER
Answered 2021-May-26 at 05:06For the ELK stack to work you need all three PersistentVolumeClaim's to be bound as I recall. Instead of creating 1 30 GB of PV create 3 of the same size with the claims and then re-install. Other nodes have unmet dependincies.
Also please do not handle the volumes by hand. There are guidelines to deploy dynamic volums. Use OpenEBS for example. That way you wont need to worry about the pvc's. After giving the pv's if anything happens write again with your cluster installation process.
I was wrong obviously, in this particular problem, filesystems and cgroups take role and the main problem of this is an old problem. From 5.2.1 to 8.0.0. Reinstall the chart by pulling the chart. Edit values file and definitely change the container version. It should be fine or create another error log stack.
QUESTION
Installing grafana using helm charts, the deployment goes well and the grafana ui is up, needed to add an existence persistence volume, ran the below cmd:
...ANSWER
Answered 2021-May-23 at 05:42NFS turns on root_squash
mode by default which functionally disables uid 0 on clients as a superuser (maps those requests to some other UID/GID, usually 65534). You can disable this in your mount options, or use something other than NFS. I would recommend the latter, NFS is bad.
QUESTION
I installed Docker on a CentOS 7 machine and DNS is not working within containers.
So, if I run nslookup google.com
on my host, it resolves correctly. However, if I do docker container run busybox nslookup google.com
I get:
ANSWER
Answered 2021-May-23 at 21:09As you can see in your error :
Can't find google.com
Container does't have access to network and therefore it can't find google !
And I can't see your Dockerfile
and docker-compose.yml
(If you use it) in the question above !
BUT
First step it's better to create a network using docker network create --help
--help ------> For seeing which options you want to use for your container networking :) (according to docs.docker)
Second step it's to EXPOSE:
the port on docker file (docs.docker & Article about concept of EXPOSE)
AND LAST : Try to check your container networking another way and simply use docker run
Try to use bash in your main image That is Cent OS for checking the network of container
QUESTION
What is the difference between alpine docker image and busybox docker image ?
When I check their dockfiles, alpine is like this (for Alpine v3.12 - 3.12.7)
...ANSWER
Answered 2021-May-18 at 14:22The key difference between these is that older versions of the busybox
image statically linked busybox against glibc (current versions dynamically link busybox against glibc due to use of libnss even in static configuration), whereas the alpine
image dynamically links against musl libc.
Going into the weighting factors used to choose between these in detail would be off-topic here (software recommendation requests), but some key points:
Comparing glibc against musl libc, a few salient points (though there are certainly many other factors as well):
- glibc is built for performance and portability over size (often adding special-case performance optimizations that take a large amount of code).
- musl libc is built for correctness and size over performance (it's willing to be somewhat slower to have a smaller code size and to run in less RAM); and it's much more aggressive about having correct error reporting (instead of just exiting immediately) in the face of resource exhaustion.
- glibc is more widely used, so bugs that manifest against its implementation tend to be caught more quickly. Often, when one is the first person to build a given piece of software against musl, one will encounter bugs (typically in that software, not in musl) or places where the maintainer explicitly chose to use GNU extensions instead of sticking to the libc standard.
- glibc is licensed under LGPL terms; only software under GPL-compatible terms can be statically linked against it; whereas musl is under a MIT license, and usable with fewer restrictions.
Comparing the advantages of a static build against a dynamic build:
- If your system image will only have a single binary executable (written in C or otherwise using a libc), a static build is always better, as it discards any parts of your libraries that aren't actually used by that one executable.
- If your system image is intended to have more binaries added that are written in C, using dynamic linking will keep the overall size down, since it allows those binaries to use the libc that's already there.
- If your system image is intended to have more binaries added in a language that doesn't use libc (this can be the case for Go and Rust, f/e), then you don't benefit from dynamic linking; you don't need the unused parts of libc there because you won't be using them anyhow.
Honestly, these two images don't between themselves cover the whole matrix space of possibilities; there are situations where neither of them is optimal. There would be value to having an image with only busybox that statically links against musl libc (if everything you're going to add is in a non-C language), or an image with busybox that dynamically links against glibc (if you're going to add more binaries that need libc and aren't compatible with musl).
QUESTION
I'm writing a Linux driver for my company in order to port our hardware to GNU/Linux desktops. I'm not a hardware guy at all and I'm struggling to understand how communication between the kernel and the hardware is made.
We basically have an AXI interconnect on which some IPs are wired (we are using Xilinx boards running PetaLinux).
I've already been able to send requests to the hardware, it works well but I feel like I'm missing something.
In the kernel I'm mapping physical addresses to virtual ones thanks to ioremap()
and I made my own implementation of read/write like so :
ANSWER
Answered 2021-May-18 at 02:43Looking at the Xilinx AXI Ethernet Driver (drivers/net/ethernet/xilinx/xilinx_axienet_main.c), setting up the iomem cookie (
mailbox
) causesreadl()
,writel()
,memcpy_fromio()
et cetera to handle the access properly.The details of how this is done at the hardware level, depends on the hardware architecture. For example, mach-ipx4xx uses __is_io_address() macro to determine whether ipx4xx_pci_read() (via
inl()
) or __raw_readl()/__indirect_readl() should be used.loff_t
is signed, and it probably makes more sense to return -EFAULT rather that -EINVAL when the offset is invalid:
QUESTION
I use Kubernetes which v1.19.7, when I run the CronJob sample
...ANSWER
Answered 2021-May-13 at 15:14For Kubernetes version 1.19.x you need to use batch/v1beta1
as apiVersion for your CronJob.
That is documented in the doc version 1-19:
https://v1-19.docs.kubernetes.io/docs/concepts/workloads/controllers/cron-jobs/
It is stable only on k8s version 1.21.
QUESTION
I have mounted two tar files as secrets. I would like to mount them to my container and then unpack the contents. The commands that created the secrets are as follows:
...ANSWER
Answered 2021-May-11 at 15:53When you create an initContainer and execute this command:
command: ['sh', '-c', 'tar -xvf /hlf/channel-artifacts/channel-artifacts.tar']
it runs in default for this container path.
I checked this by adding pwd
and ls -l
commands.
Whole line is:
command: ['sh', '-c', 'tar -xvf /hlf/channel-artifacts/channel-artifacts.tar ; pwd ; ls -l']
From an initContainer you can get logs by:
kubectl logs fabric-orderer-01-xxxxxx -c init-channel-artifacts
Output was:
QUESTION
I am trying to deploy my first cron job.
Starting with a very simple one, as described in the k8s tutorial:
...ANSWER
Answered 2021-May-11 at 08:49The Cronjob apiVersion in the kubernetes 1.18 is batch/v1beta1
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