containers | Simple containers using Linux user namespaces — see | Continuous Deployment library
kandi X-RAY | containers Summary
kandi X-RAY | containers Summary
This package is a simple implementation of containers for Linux, making secure containers as easy to create and use as a traditional chroot. It comprises three utilities, contain, inject and pseudo, which use the kernel support for user namespaces merged in Linux 3.8.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of containers
containers Key Features
containers Examples and Code Snippets
protected String injectInitContainer(ObjectNode body, String waitForArgs) {
// Recover original init containers from the request
JsonNode originalSpec = body.path("request")
.path("object")
.path("spec")
def filter_empty_layer_containers(layer_list):
"""Filter out empty Layer-like containers and uniquify."""
# TODO(b/130381733): Make this an attribute in base_layer.Layer.
existing = object_identity.ObjectIdentitySet()
to_visit = layer_list[::
def filter_empty_layer_containers(layer_list):
"""Filter out empty Layer-like containers and uniquify."""
# TODO(b/130381733): Make this an attribute in base_layer.Layer.
existing = set()
to_visit = layer_list[::-1]
while to_visit:
obj
Community Discussions
Trending Discussions on containers
QUESTION
Got this:
...ANSWER
Answered 2022-Jan-13 at 11:26The issue is really that .lines
does not produce containers. So with <->
, you would bind to the value, rather than a container. There are several ways to solve this, by containerizing as you suggested:
QUESTION
Both replica set and deployment have the attribute replica: 3
, what's the difference between deployment and replica set? Does deployment work via replica set under the hood?
configuration of deployment
...ANSWER
Answered 2021-Oct-05 at 09:41A deployment is a higher abstraction that manages one or more replicasets to provide controlled rollout of a new version.
As long as you don't have a rollout in progress a deployment will result in a single replicaset with the replication factor managed by the deployment.
QUESTION
I was able to build a multiarch image successfully from an M1 Macbook which is arm64. Here's my docker file and trying to run from a raspberrypi aarch64/arm64 and I am getting this error when running the image: standard_init_linux.go:228: exec user process caused: exec format error
Editing the post with the python file as well:
...ANSWER
Answered 2021-Oct-27 at 16:58A "multiarch" Python interpreter built on MacOS is intended to target MacOS-on-Intel and MacOS-on-Apple's-arm64.
There is absolutely no binary compatibility with Linux-on-Apple's-arm64, or with Linux-on-aarch64. You can't run MacOS executables on Linux, no matter if the architecture matches or not.
QUESTION
I am trying to create an std::set
of pointers to data members. However, I can't find a method to sort or hash such pointers.
They can't be compared with operator<
, they don't seem to be supported by std::less
and there is no standard integer type that is guaranteed to hold their representation (they might not fit in std::uintptr_t
).
This is what I tried first (https://godbolt.org/z/K8ajn3rM8) :
...ANSWER
Answered 2022-Jan-06 at 16:08Compare them bytewise, e.g. using this comparator:
QUESTION
I am trying to get to grips with the specifics of the (C++20) standards requirements for container classes with a view to writing some container classes that are compatible with the standard library. To begin looking into this matter I have looked up the references for named requirements, specifically around container requirements, and have only found one general container requirement called Container
given by the standard. Reading this requirement has given my two queries that I am unsure about and would like some clarification on:
The requirement for the expression
a == b
for two container typeC
has as precondition on the element typeT
that it is equality comparable. However, noted later on the same page under the header 'other requirements' is the explicitly requirement thatT
be always equality comparable. Thus, on my reading the precondition for the aforementioned requirement is redundant and need not be given. Am I correct in this thinking, or is there something else at play here that I should take into account?I was surprised to see explicit requirements on
T
at all: notably the equality comparable requirement above and the named requirement destructible. Does this mean it is undefined behaviour to ever construct standard containers of types failing these requirements, or only to perform certain standard library function calls on them?
Apologies if these two questions sound asinine, I am currently trying to transition my C++ knowledge from a place of having a basic understanding of how to use features to a robust understanding so that I may write good generic code. Whilst I am trying to use (a draft of) the standard to look up behaviour where possible, its verbiage is oft too verbose for me to completely understand what is actually being said.
In an attempt to seek the answer I cooked up a a quick test .cpp
file to try an compile, given below. All uncommented code compiles with MSVC compiler set to C++20. All commented code will not compile, and visa versa all uncommented code will. It seems that what one naively thinks should work does In particular:
- We cannot construct any object without a destructor, though the objects type is valid and can be used for other things (for example as a template parameter!)
- We cannot create an object of
vector
, whereT
has no destructor, even if we don't attempt to create any objectsT
. Presumably because creating the destructor forvector
tries to access a destructor forT
. - We can create an object of type
vector
,T
whereT
has no operator==
, so long as we do not try to use operator==
, which would requireT
to have operator==
.
However, just because my compiler lets me make an object of vector
where T
is not equality-comparable does not mean I have achieved standards compliant behaviour/ all of our behaviour is not undefined - which is what I want I concerned about, especially as at least some of the usual requirements on the container object have been violated.
Code:
...ANSWER
Answered 2021-Dec-30 at 04:32If the members of a container are not destructible, then the container could never do anything except add new elements (or replace existing elements). erase
, resize
and destruction all involve destroying elements. If you had a type T
that was not destructible, and attempted to instantiate a vector
(say), I would expect that it would fail to compile.
As for the duplicate requirements, I suspect that's just something that snuck in when the CppReference folks wrote that page. The container requirements in the standard mention (in the entry for a == b
) that the elements must be equality comparable.
QUESTION
I use std::erase_if
to erase half the elements from containers using a captured counter as follows. C++20 compiled with gcc10
ANSWER
Answered 2021-Dec-28 at 07:50remove_if
takes a Predicate. And the standard library requires that a Predicate type:
Given a glvalue
u
of type (possibly const)T
that designates the same object as*first
,pred(u)
shall be a valid expression that is equal topred(*first)
.
Your predicate changes its internal state. As such, calling it twice with the same element will yield different results. That means it does not fulfill the requirements of Predicate.
And therefore, undefined behavior ensues.
QUESTION
We've had a working Ansible AWX instance running on v5.0.0 for over a year, and suddenly all jobs stop working -- no output is rendered. They will start "running" but hang indefinitely without printing out any logging.
The AWX instance is running in a docker compose container setup as defined here: https://github.com/ansible/awx/blob/5.0.0/INSTALL.md#docker-compose
ObservationsStandard troubleshooting such as restarting of containers, host OS, etc. hasn't helped. No configuration changes in either environment.
Upon debugging an actual playbook command, we observe that the command to run a playbook from the UI is like the below:
ssh-agent sh -c ssh-add /tmp/awx_11021_0fmwm5uz/artifacts/11021/ssh_key_data && rm -f /tmp/awx_11021_0fmwm5uz/artifacts/11021/ssh_key_data && ansible-playbook -vvvvv -u ubuntu --become --ask-vault-pass -i /tmp/awx_11021_0fmwm5uz/tmppo7rcdqn -e @/tmp/awx_11021_0fmwm5uz/env/extravars playbook.yml
That's broken down into three commands in sequence:
ssh-agent sh -c ssh-add /tmp/awx_11021_0fmwm5uz/artifacts/11021/ssh_key_data
rm -f /tmp/awx_11021_0fmwm5uz/artifacts/11021/ssh_key_data
ansible-playbook -vvvvv -u ubuntu --become --ask-vault-pass -i /tmp/awx_11021_0fmwm5uz/tmppo7rcdqn -e @/tmp/awx_11021_0fmwm5uz/env/extravars playbook.yml
You can see in part 3, the -vvvvv
is the debugging argument -- however, the hang is happening on command #1. Which has nothing to do with ansible or AWX specifically, but it's not going to get us much debugging info.
I tried doing an strace
to see what is going on, but for reasons given below, it is pretty difficult to follow what it is actually hanging on. I can provide this output if it might help.
So one natural question with command #1 -- what is 'ssh_key_data'?
Well it's what we set up to be the Machine credential in AWX (an SSH key) -- it hasn't changed in a while and it works just fine when used in a direct SSH command. It's also apparently being set up by AWX as a file pipe:
prw------- 1 root root 0 Dec 10 08:29 ssh_key_data
Which starts to explain why it could be potentially hanging (if nothing is being read in from the other side of the pipe).
Running a normal ansible-playbook from command line (and supplying the SSH key in a more normal way) works just fine, so we can still deploy, but only via CLI right now -- it's just AWX that is broken.
ConclusionsSo the question then becomes "why now"? And "how to debug"? I have checked the health of awx_postgres, and verified that indeed the Machine credential is present in an expected format (in the main_credential
table). I have also verified that can use ssh-agent on the awx_task container without the use of that pipe keyfile. So it really seems to be this piped file that is the problem -- but I haven't been able to glean from any logs where the other side of the pipe (sender) is supposed to be or why they aren't sending the data.
ANSWER
Answered 2021-Dec-13 at 04:21Had the same issue starting this Friday in the same timeframe as you. Turned out that Crowdstrike (falcon sensor) Agent was the culprit. I'm guessing they pushed a definition update that is breaking or blocking fifo pipes. When we stopped the CS agent, AWX started working correctly again, with no issues. See if you are running a similar security product.
QUESTION
I always used docker-compose on Ubuntu, in this environment containers are named with underscore:
- __
But now, I switched to Windows 10 (using Docker Desktop) and naming convention has changed:
- --
I don't know if this is OS dependent but it's a problem. My scripts are failing because they rely on containers named with underscores.
Is there a way to customize this and use underscore instead of dashes?
...ANSWER
Answered 2021-Nov-19 at 02:19This naming convention difference appears to be a difference between Docker Compose versions v1 (Python) and v2 (Go). The latest docker/compose repo that is packaged with Docker Desktop is the golang version in the docker/compose v2 branch. Looking at the source code here in this branch:
QUESTION
C++20 introduced std::span
, which is a view-like object that can take in a continuous sequence, such as a C-style array, std::array
, and std::vector
. A common problem with a C-style array is it will decay to a pointer when passing to a function. Such a problem can be solved by using std::span
:
ANSWER
Answered 2021-Nov-27 at 02:27The question is not why this fails for int[]
, but why it works for all the other types! Unfortunately, you have fallen prey to ADL which is actually calling std::size
instead of the size
function you have written. This is because all overloads of your function fail, and so it looks in the namespace of the first argument for a matching function, where it finds std::size
. Rerun your program with the function renamed to something else:
QUESTION
I want to programmatically detect whenever someone sends Bitcoin to some address. This happens on a local testnet which I start using this docker-compose.yml file.
Once the local testnet runs, I create a new address using
...ANSWER
Answered 2021-Nov-18 at 19:39I haven't tested your full setup with electrumx
and the ethereum
stuff present in your docker-compose
file, but regarding your problem, the following steps worked properly, and I think it will do as well in your complete setup.
I ran with docker a bitcoin node based in the ulamlabs/bitcoind-custom-regtest:latest
image you provided:
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