containers

Difference between Docker ENTRYPOINT and Kubernetes container spec COMMAND?

为君一笑 提交于 2019-12-03 08:17:20
问题 Dockerfile has a parameter for ENTRYPOINT and while writing Kubernetes deployment YAML file, there is a parameter in Container spec for COMMAND . I am not able to figure out what's the difference and how each is used? 回答1: Kubernetes provides us with multiple options on how to use these commands: When you override the default Entrypoint and Cmd in Kubernetes .yaml file, these rules apply: If you do not supply command or args for a Container, the defaults defined in the Docker image are used.

Can't use yum inside Docker container running on CentOS

社会主义新天地 提交于 2019-12-03 08:16:34
问题 I am unable to run any yum commands inside my Docker container without getting the following error: ovl: Error while doing RPMdb copy-up: [Errno 13] Permission denied: '/var/lib/rpm/Group' You need to be root to perform this command. I'm confused because I'm pretty sure docker containers are run with the default user root. Still, if I try putting sudo in front of a yum install -y <package> or yum update -y command I get: /bin/sh: sudo: command not found I'm using the following base image so I

Running Visual Studio Remote Debugger in Windows Container (Docker managed)

只谈情不闲聊 提交于 2019-12-03 07:11:44
问题 I try to run the Visual Studio Remote Debugger in a Windows Container on Windows Server 2016 TP4 . Since it runs inside a container, there is no UI. I try to run the remote debugger via: .\msvsmon.exe /nostatus /silent /nosecuritywarn /nofirewallwarn /noclrwarn /port 4020 I am executing the above as administrator user (nt authority\system). This works fine on the host computer, but it does not work inside the container. The Windows event log shows the following error event. Msvsmon was unable

How can I make find() work with a set of structs?

泄露秘密 提交于 2019-12-03 07:09:47
I am using a set to hold structs which contain several strings. I want to be able to use the find() functionality of sets. However, since the set is holding structs, it doesn't work. I want find() to look only at one of the strings in the struct. How can this be done? Here's the code that I tried to use. It works fine except for the part where find() is used: #include <iostream> #include <string> #include <set> using namespace std; struct test { string key; string data; }; bool operator<(const test & l, const test & r) { return l.key < r.key; } bool operator==(const test & l, const test & r) {

Using docker-compose to set containers timezones

一曲冷凌霜 提交于 2019-12-03 06:53:49
问题 I have a docker-compose file running a few Dockerfiles to create my containers. I don't want to edit my Dockerfiles to set timezones because they could change at any time by members of my team and I have a docker-compose.override.yml file to make local environment changes. However, one of my containers (a Selenium based one) seems to not pull host time zone and that causes problems for me. Based on that I want to enforce timezones on all my containers. In my Dockerfiles right now I do ENV TZ

What is the major difference between a vector and a stack?

冷暖自知 提交于 2019-12-03 06:51:24
问题 Both act like a stack. Both have push and pop operations. Is the difference in some memory layouts? 回答1: std::vector has several accessibility and modification operations compared to std::stack . In case of std::stack , you may have to perform operations only in systematic way, where you can push() above the last element or pop() the last element. std::vector is more flexible in that sense, where it has several operations, where you can insert() in between or erase() in between. The major

STL Container: Constructor's Allocator parameter and scoped allocators

微笑、不失礼 提交于 2019-12-03 06:51:10
问题 There is a template parameter for STL containers to chose a custom allocator. It took a while, but I think I understand how it works. Somehow it isn't really nice because the given allocator type isn't used directly but it is rebound to the allocator of another type. Finally I can work with it. After reading the API I recognized that there is also the possibility to give allocators as constructor parameter. But how do I know which kind of allocator the container uses, if it internally rebinds

Is Stephen Lavavej's Mallocator the same in C++11?

风格不统一 提交于 2019-12-03 06:38:43
8 years ago, Stephen Lavavej published this blog post containing a simple allocator implementation, named the "Mallocator". Since then we've transitioned to the era of C++11 (and soon C++17) ... does the new language features and rules affect the Mallocator at all, or is it still relevant as is? STL himself has an answer to this question in his STL Features and Implementation techniques talk at CppCon 2014 (Starting at 26'30). The slides are on github. I merged the content of slides 28 and 29 below: #include <stdlib.h> // size_t, malloc, free #include <new> // bad_alloc, bad_array_new_length

How to create a Docker container of an AngularJS app?

孤街浪徒 提交于 2019-12-03 06:28:46
I have an AngularJS app that has this structure: app/ ----- controllers/ ---------- mainController.js ---------- otherController.js ----- directives/ ---------- mainDirective.js ---------- otherDirective.js ----- services/ ---------- userService.js ---------- itemService.js ----- js/ ---------- bootstrap.js ---------- jquery.js ----- app.js views/ ----- mainView.html ----- otherView.html ----- index.html How do I go about creating my own image out of this and running it on a container? I've tried running it with no success with a Dockerfile and I'm relatively new to Docker so apologies if this

How to know the reason why a docker container exits?

牧云@^-^@ 提交于 2019-12-03 06:26:16
问题 I have a Docker container running in a host of 1G RAM (there are also other containers running in the same host). The application in this Docker container will decode some images, which may consume memory a lot. From time to time, this container will exit. I doubt it is due to out of memory but not very sure. I need a method to find the root cause. So is there any way to know what happened for this container's death? 回答1: Others have mentioned docker logs $container_id to view the output of